20mA R FB. Fig. 1 Li-Ion Powered Driver for Three White LEDs
|
|
- Junior Small
- 5 years ago
- Views:
Transcription
1 Built-in White ED Step-Up Converter FEATURES Built-In Open Circuit Protection Over Voltage Protection Efficiency Up to 84% at V IN =4.2V, 3EDs, I ED =20mA 1.2MHz Fixed Switching Frequency Adjustable Output Voltage up to 22V ow Supply Current: µa Matches ED Current Requires Tiny Inductor and Capacitors Tiny SOT-23-6 Package APPICATIONS Cellular Phones PDAs DSCs Handheld Devices White ED Display Backlighting DESCRIPTION is a fixed frequency step-up DC/DC converter designed to drive white EDs with a constant current to provide backlight in handheld devices. Series connection of EDs provides identical ED currents resulting in uniform brightness. This configuration eliminates the need of ballast resistors. The built-in open load protection prevents the damage resulting from an open circuit condition. ow 95mV feedback voltage minimizes power loss in the current setting resistor for better efficiency. is a step-up PWM converter, which includes an internal N-channel MOSFET switch for high efficiency. The high switching frequency, 1.2MHz, allows the use of tiny external components. is available in a space-saving, 6-lead SOT-23-6 package. TYPICA APPICATION CIRCUIT 3.3~4.2V 6.8µH SW GND FB 20mA 1: 976AS-6R8M/D321F, TOKO : JMK107BJ105KA, TAIYO YUDEN : EMK107BJ105KA, TAIYO YUDEN ED Current (ma) Efficiency (%) V IN=4.2V V IN=3.0V 3 EDs, 6.8µH V IN=3.6V 1: 976AS-6R8M, TOKO Fig. 1 i-ion Powered Driver for Three White EDs Analog Integrations Corporation 4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan DS-1648P TE: FAX:
2 ORDERING INFORMATION XXXX PACKING TYPE TR: TAPE & REE BG: BAG PACKAGE TYPE G: SOT-23-6 ORDER NUMBER CG&PG (SOT-23-6) PIN CONFIGURATION FRONT VIEW Example: C: Commercial P: ead Free Commercial CGTR in SOT-23-6 Package & Tape & Reel Packing Type 1 SW 2 3 GND FB MARKING Part No. Marking Part No. Marking CG 1648 PG 1648P ABSOUTE MAXIMUM RATINGS Input Voltage () SW Voltage FB Voltage 6V 33V 6V Voltage 6V Voltage 34V Operating Temperature Range 40 C to 85 C Maximum Junction Temperature 125 C Storage Temperature Range 65 C to 150 C ead Temperature (Soldering, 10 sec) 300 C Note1: Any stress beyond Absolute Maximum Ratings above may cause eternal damage to the device. TEST CIRCUIT 1 V IN GND SW FB 1: 976AS-100M, TOKO : JMK107BJ105KA, TAIYO YUDEN : EMK212BJ224KG, TAIYO YUDEN RFB I ED 0.22µF 2
3 EECTRICA CHARACTERISTICS (V =3V, V IN =3V, T A =25 C, unless otherwise specified.) PARAMETER SYMBO TEST CONDITIONS MIN TYP MAX UNIT Minimum Operating Voltage V IN 2.5 V Maximum Operating Voltage V IN 5.5 V Switching 1 5 ma Supply Current I IN Non switching 100 V = 0V µa ERROR AMPIFIER Feedback Voltage V FB mv FB Input Bias Current I FB V FB =95mV 1 na OSCIATOR Switching Frequency f OSC MHz Maximum Duty Cycle DC % POWER SWITCH SW ON Resistance R DS(ON) Ω Switch eakage Current I SW(OFF) V SW =33V µa CONTRO INPUT Voltage High V IH ON 1.5 V Voltage ow V I OFF 0.3 V OVER VOTAGE PROTECTION Input Resistance R mω Threshold V 1V Hysteresis typical V Note2: Specifications are guaranteed by Statistical Quality Controls (SQC), with no production test proved, when operating temperature ranges from -40 C to 85 C. 3
4 TYPICA PERFORMANCE CHARACTERISTICS Feedback Voltage (mv) Temperature ( C) Fig. 2 Feedback Voltage vs. Temperature Switching Frequency (MHz) Fig. 3 Temperature ( C) Switching Frequency vs. Temperature 1.6 Supply Current (µa) FB=V IN Supply Current (ma) FB=GND Non-Switching Supply Voltage (V) Fig. 4 Supply Current vs. Supply Voltage 0.6 Switching Fig. 5 Supply Voltage Supply Current vs. Supply Voltage RDSON (Ω) Supply Voltage (V) Fig. 6 R DS-ON vs. Supply Voltage IED_DUTY / IEDMAX (%) V IN =3.6V; = C IN =, C OUT =0.22µF 3EDs 100Hz & 200Hz 500Hz 1KHz 2KHz 3KHz PIN PWM Duty (%) 100 Fig. 7 Dimming Control by Shutdown PIN 4
5 TYPICA PERFORMANCE CHARACTERISTICS (Continued) Efficiency (%) V IN =3.0V V IN =4.2V V IN =3.6V 3 EDs, 1: 976AS-100M, TOKO Test circuit refer to Fig ED Current (ma) Fig. 8 3 EDs Efficiency vs. ED Current Efficiency (%) Fig. 9 V IN =4.2V V IN =3.0V 4 EDs, V IN =3.6V 1: 976AS-100M, TOKO Test circuit refer to Fig.1 ED Current (ma) 4 EDs Efficiency vs. ED Current V IN =4.2V 85 V IN =4.2V Efficiency (%) V IN =3.0V 5 EDs, V IN=3.6V 1: 976AS-100M, TOKO Test circuit refer to Fig.1 Efficiency (%) V IN =3.0V 3 EDs, 6.8µH V IN =3.6V 1: 976AS-6R8M, TOKO Test circuit refer to Fig ED Current (ma) Fig EDs Efficiency vs. ED Current ED Current (ma) Fig EDs Efficiency vs. ED Current V, 2V/div V OUT, 100mV/div V OUT, 2V/div I INDUCTOR, 100mA/div I INDUCTOR, 100mA/div V SW, 10V/div V IN=3.6V; 3 EDs; 1=10µF; C OUT=0.22µF; I ED=20mA Fig. 12 Start-Up from Shutdown V IN =3.6V; 3 EDs; 1=10µF; C OUT =0.22µF; I ED =10mA Fig. 13 Operation Wave Form 5
6 TYPICA PERFORMANCE CHARACTERISTICS (Continued) Output Voltage (V) I ED =20mA 6 Samples' Temperature Data ED Current (ma) V IN =4.2V V IN =3.6V V IN =3.3V V IN =2.5V 4 EDs Temperature ( C) Fig. 14 Output voltage vs. temperature Temperature ( C) Fig. 15 ED Current vs. Temperature BOCK DIAGRAM 30.5V Over Voltage Comparator + - PWM/PFM Control 95mV VREF + Error AMP + - PWM Comparator Control ogic Driver * M1 SW FB - RC* Slope Compensation 1.2MHz Oscillator CC Internal Soft Start * + - Current AMP. RS* GND 6
7 PIN DESCRIPTIONS PIN 1: SW - Switch pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI. PIN 2: GND - Ground pin. Tie directly to local ground plane. PIN 3: FB - Feedback pin. Reference voltage is 95mV. Connect cathode of lowest ED and resistor here. Calculate resistor value to obtain ED current according to the formula: PIN 4: - Shutdown pin. Tie to higher than 1.5V to enable device, 0.3V or less to disable device. PIN 5: PIN 6: - Overvoltage protection. When VOUT is greater than 27V, the internal MOSFET turns off. - Power input pin. Bypass to GND with a capacitor sitting as close to as possible. = 95mV/I ED APPICATION INFORMATION Inductor Selection A inductor is recommended for most applications. Although small size and high efficiency are major concerns, the inductor should have low core losses at 1.2MHz and low DCR (copper wire resistance). Capacitor Selection The small size of ceramic capacitors makes them ideal for applications. X5R and X7R types are recommended because they retain their capacitance over wider ranges of voltage and temperature than other types, such as Y5V or Z5U. input capacitor with output capacitor are sufficient for most applications. Diode Selection Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for applications. The forward voltage drop of an Schottky diode represents the conduction losses in the diode, while the diode capacitance (CT or CD) represents the switching losses. For diode selection, both forward voltage drop and diode capacitance need to be considered. Schottky diodes with higher current ratings usually have lower forward voltage drop and larger diode capacitance, which can cause significant switching losses at the 1.2MHz switching frequency of. An Schottky diode rated at 100mA to 200mA is sufficient for most applications. ED Current Control ED current is controlled by feedback resistor ( in Figure 1). The feedback reference voltage is 95mV. The ED current is 95mV/. In order to have accurate ED current, precision resistors are preferred (1% recommended). The formula for selection is shown below. = 95mV/I ED Open-Circuit Protection In the cases of output open circuit, when the EDs are disconnected from the circuit or the EDs fail, the feedback voltage will be zero. will then switch to a high duty cycle resulting in a high output voltage, which may cause SW pin voltage to exceed its maximum 33V rating. Connect builtin (Over Voltage Protection) pin to output terminal to prevent the damage resulting from an open circuit condition. 7
8 Dimming Control There are three different ways of dimming control circuits as follows: 1. Using a PWM signal PWM brightness control provides the widest dimming range by pulsing the EDs on and off at full and zero current, respectively. The change of average ED current depends on the duty cycle of the PWM signal. Typically, a 0.1kHz to 1kHz PWM signal is used. Two applications of PWM dimming with are shown in Figure 14 and Figure 15. One, as Figure 14, uses PWM signal to drive pin directly for dimming control. The other, as Figure 15, employs PWM signal going through a resistor to drive FB pin. If the pin is used, the increase of duty cycle results in ED brightness enhancement. If the FB pin is used, on the contrary, the increase of duty cycle will decrease its brightness. In this application, EDs are dimmed by FB pin and turned off completely by. 2. Using a DC Voltage For some applications, the preferred method of a dimming control uses a variable DC voltage to adjust ED current. The dimming control using a DC voltage is shown in Figure 16. With a VDC ranging from 0V to 5V, the selection of resistors in Figure 16 results in dimming control of ED current from 20mA to 0mA, respectively. 3. Using a Filtered PWM Signal Filtered PWM signal can be considered as an adjustable DC voltage. It can be used to replace the variable DC voltage source in dimming control. The circuit is shown in Figure 17. SW RB521S-30 PWM GND FB Fig. 14 Dimming Control with a PWM Signal V IN SW RB521S-30 GND FB PWM R2 51K R1 1K Fig. 15 Dimming Control Using a PWM Signal 8
9 V IN SW RB521S-30 GND FB V DC 0~5V R2 51K R1 1K Fig. 16 Dimming Control Using a DC Voltage SW RB521S-30 GND FB PWM R3 5.1K R1 1K R2 51K C3 0. Fig. 17 Dimming Control Using a Filter PWM Signal APPICATION EXAMPES 3.0~4.2V SW GND FB RB521S-30 20mA R1 Fig. 18 Six White EDs Application in i-ion Battery 9
10 PHYSICA DIMENSIONS (unit: mm) SOT-23-6 (CG) (PG) D C SYMBO MIN MAX H E A A A b e θ1 C D A2 A E e 1.90 (TYP) b A1 H θ1 1 9 Note: Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that may result from its use. We reserve the right to change the circuitry and specifications without notice. ife Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. ife support devices or systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 10
20mA R FB. Fig. 1 Li-Ion Powered Driver with Over Voltage Protection for Three White LEDs
White LED Step-Up Converter in SOT23 FEATURES 1.2MHz Fixed Frequency Current-Mode PWM Operation. Efficiency Up to 84% at, 3LEDs, I LED = Adjustable Output Voltage up to 30V Low Supply Current: µa Matches
More informationAIC1896. Efficiency (%) I LED R1. Fig. 1 Li-Ion Powered Driver for three white LEDs
.MHz SOT2 Current-Mode Step-Up DC/DC Converter FEATURES Fixed Frequency.MHz Current-Mode PWM Operation. Adjustable Output Voltage up to 0V. Guaranteed V/ 200mA Output with 5V Input. 2.5V to 0V Input Range.
More informationUNISONIC TECHNOLOGIES CO., LTD
UNISONIC TECHNOLOGIES CO., LTD WHITE LED STEP-UP CONVERTER DESCRIPTION The UTC L5101 is a constant current step-up PWM DC/DC converter optimized to drive white LEDs. It can drive LEDs in series with a
More informationAT731 White LED Step-Up Converter
FEATURES DESCRIPTION Inherently Matched LED Current High Efficiency: 84% Typical Drives Up to Four LEDs from a 3.2V Supply Drives Up to Eight LEDs from a 5V Supply 36V Rugged Bipolar Switch Fast 1.2MHz
More informationAIC mA, 1.2MHz Synchronous Step-Up Converter
700mA, 1.2MHz Synchronous Step-Up Converter FEATURES V IN Start Up Voltage: 0.9V Output Voltage Range: from 2.7V to 5.25V. Up to 94% Efficiency 1.2MHz Fixed Frequency Switching Built-in current mode compensation
More informationAIC1848 C+ 6 VIN 5 C FLY. Regulated 5V Output from 2.7V to 4.5V Input WLED series number: NSPW310BS, V F =3.6V, I F =20mA
FEATURES Regulated ±% Output Voltage Output Current: 00mA at V IN =.V Input Range:.7V to.5v No Inductors Required Very Low Shutdown Current:
More informationAnalog Integrations Corporation 4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan DS
Micropower Inverting DC/DC Converter in SOT-3- FEATURES Low Quiescent Current: 1µA in Active Mode
More informationAIC2354 1A Synchronous PWM/PSM Step-Down DC/DC Converter
1A Synchronous PWM/PSM Step-Down DC/DC Converter FEATURES.5V to 5.5V Input Voltage Range 1.0A Guaranteed Output Current Up to 95% Efficiency ow R DS(ON) Internal Switche: 80mΩ No Schottky Diode Required
More information23V 3A Step-Down DC/DC Converter
23V 3A Step-Down DC/DC Converter FEATURES 3A Continuous Output Current Programmable Soft Start 100mΩ Internal Power MOSFET Switch Stable with Low ESR Output Ceramic Capacitors Up to 95% Efficiency 22µA
More informationWhite LED Step-Up Converter (Preliminary) Features. Application. Package Ordering Information Marking Information SOT-23-5L SE3506-LF
Description The is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive two, three, four, or five LEDs in series from a Li-Ion cell. Series
More informationBuilt-In OVP White LED Step-up Converter in Tiny Package
Built-In White LED Step-up Converter in Tiny Package Description The is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive up to 4 LEDs in
More informationAIC1596 3A STEP-DOWN PWM CONVERTER
3A STEP-DOWN PWM CONVERTER FEATURES Operating Input Voltage From 4.5V to 30V 3.3V, 5V, 12V and Adjustable Output Version Adjustable Version Output Voltage Range, 1.25V to 30V ± 4% max Over ine and oad
More informationAIC1841/2 High Efficiency 1.5X charge Pump For White LEDs Backlighting
High Efficiency.5X charge Pump For White EDs Backlighting FEATURES MHz Switching Frequency.7V to 5.5V Input Voltage Range ow Shutdown Current: μa Regulated 0mA Full-Scale Output Current 3-Position inear
More informationHigh-Efficiency, 40V White LED Driver with Dimming Control
High-Efficiency, 40V White LED Driver with Dimming Control Description The is a step-up DC/DC converter specifically designed for driving WLEDs with a constant current. The can drive up 10 white LEDs in
More informationUNISONIC TECHNOLOGIES CO.,
UNISONIC TECHNOOGIES CO., WHITE ED STEP-UP CONVERTER 3 2 DESCRIPTION The UTC is a STEP-UP DC/DC Converter and designed for driving white EDs with a constant current. It can drive several EDs in series
More informationAIC2304 1A Synchronous PWM Step-Down DC/DC Converter
1A Synchronous PWM Step-Down DC/DC Converter FEATURES 2.5V to 5.5V Input Voltage Range 1.0A Guaranteed Output Current Up to 95% Efficiency ow R DS(ON) Internal Switche: 280mΩ No Schottky Diode Required
More informationApplication Battery Power Equipment Notebook Computers PDA Cellular Phone Digital Cameras MP3 Players GPS Receivers
General Description The is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive two, three or four LEDs in series from a Li-Ion cell. Series
More informationAT MHz 2A SOT-26 Step Up DC-DC Converter
FEATURES DESCRIPTION up to 93% Efficiency Integrated 80mΩ Power MOSFET 2.3V to 24V Input Voltage 1.2MHz Fixed Switching Frequency Internal 4A Switch Current Limit Adjustable Output Voltage up to 28V Internal
More informationDiode Embedded Step-up Converter for White LED Driver
Diode Embedded Step-up Converter for White LED Driver Description The is a step-up current mode PWM DC/DC converter with an internal diode and 0.6Ω power N-channel MOSFET. It can support 2 to 4 white LEDs
More informationACT6311. White LED/OLED Step-Up Converter FEATURES
White LED/OLED Step-Up Converter FEATURES Adjustable Output Voltage Drives OLEDs or White LEDs 30V High Voltage Switch 1MHz Switching Frequency Tiny Inductors and Capacitors Tiny SOT23-5 Package APPLICATIONS
More informationEfficiency (%) I LED. Fig. 1 Li-Ion Powered Driver for three white LEDs
. 4MHz Thin Package Current-Mode Step-Up DC/DC Converter FETURES Fixed Frequency.4MHz Current-Mode PWM Operation. djustable Output Voltage up to 30V. Guaranteed 3V/ 200m Output with 5V Input. 2.5V to 0V
More informationC2 0.22μF. 15mA F01a PIN PIN NAME PIN DESCRIPTION
WHITE E STEP-UP CONVERTER FEATURES Inherently Matched E Current High Efficiency: 84% Typical rives Up to Four Es from a 3.2V Supply rives Up to Six Es from a 5V Supply 36V Rugged Bipolar Switch Fast 1.2MHz
More informationTS19371 Boost (Step-up) WLED Driver with OVP
SOT-26 Pin Definition: 1. SW 6. VIN 2. GND 5. OVP 3. FB 4. CTRL General Description The is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive
More informationTFT-LCD DC/DC Converter with Integrated Backlight LED Driver
TFT-LCD DC/DC Converter with Integrated Backlight LED Driver Description The is a step-up current mode PWM DC/DC converter (Ch-1) built in an internal 1.6A, 0.25Ω power N-channel MOSFET and integrated
More informationYB1508 Step-up DC-DC Converter, White LED Driver
Description The YB1508 is a step-up DC-DC converter, acting as current source to drive up to 8 white LEDs in series. Series connecting of the LEDs provides identical LED currents resulting in uniform brightness
More informationBoost (Step-up) WLED Driver with OVP
Boost (Step-up) WLED Driver with OVP DESCRIPTION The TS19371 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive up to 126 LEDs (9S14P)
More informationWhite LED Step-Up Converter
FEATURES Inherently Matched LED Current Drives Up to 27 LEDs from a 5V Supply Power Management IC 36V Rugged Bipolar Switch Fast 1.2MHz Switching Frequency Vovp(MAX) = 29V Moisture Sensitivity Level 3
More informationAIC2858 F. 3A 23V Synchronous Step-Down Converter
3A 23V Synchronous Step-Down Converter FEATURES 3A Continuous Output Current Programmable Soft Start 00mΩ Internal Power MOSFET Switches Stable with Low ESR Output Ceramic Capacitors Up to 95% Efficiency
More informationEUP2584. White LED Step-Up Converter In Tiny SOT-23 Package FEATURES DESCRIPTION APPLICATIONS. Typical Application Circuit
White LED Step-Up Converter In Tiny SOT-23 Package DESCRIPTION The is a constant current step-up converter specifically designed to drive white LEDs. The Step-up converter topology allows series connection
More informationAT MHz 2A Step Up DC-DC Converter
FEATURES DESCRIPTION up to 93% Efficiency Integrated 80mΩ Power MOSFET 2.3V to 24V Input Voltage 1.2MHz Fixed Switching Frequency Internal 4A Switch Current Limit Adjustable Output Voltage up to 28V Internal
More informationYB1506 Step-up DC-DC Converter, White LED Driver
Description The YB1506 is a step-up(boost) DC-DC converter; operate as current source to drive up to 5 white LEDs in series. Series connecting of the LEDs provides identical LED currents resulting in uniform
More informationEUP2511. HQI Boost Converter With 2.1A Switch In Tiny SOT-23 Package FEATURES DESCRIPTION APPLICATIONS. Typical Application Circuit
HQI Boost Converter With 2.1A Switch In Tiny SOT-23 Package DESCRIPTION The is a high performance current mode, PWM step-up converter. With an internal 2.1A, 150mΩ MOSFET, it can generate 5 at up to 900mA
More informationYB1522 Step-up DC-DC Converter White LED Driver
Description The YB1522 is a step-up DC-DC converter; with wide input voltage range from 3V to 16V, which operates as current source to drive up to 3S7P to 3S1P (V IN at 3V to 5V). Series connecting of
More informationPWM Step-Up DC/DC Converter for Panel Backlight. Features. Fig. 1
PWM Step-Up DC/DC Converter for Panel Backlight General Description The designed with high efficiency step up DC/DC converter for driving white LEDs. The device can drive up 11 white LEDs from a single
More informationYB1520 Step-up DC-DC Converter, White LED Driver
Description The YB1520 is a step-up DC-DC converter; operates as current source to drive up to 18 white LEDs in parallel/series configuration. Series connecting of the LEDs provides identical LED currents
More informationHT7938A High Current and Performance White LED Driver
High Current and Performance White LED Driver Feature Efficiency up to 90% at V IN =4.0V, 5S2P, I LED =20mA 1.2MHz fixed switching frequency Low standby current: 0.1mA (typ.) at V EN =0V Matches LED current
More informationConstant Current Switching Regulator for White LED
Constant Current Switching Regulator for White LED FP7201 General Description The FP7201 is a Boost DC-DC converter specifically designed to drive white LEDs with constant current. The device can support
More informationHigh Voltage CMOS Boost White LED Driver
High Voltage CMOS Boost White LED Driver FEATURES Drives 6 to 8 White LEDs in series from 3V Up to 87% Efficiency Low Quiescent Ground Current 0.6mA Adjustable Output Current (up to 40mA) High Frequency
More informationEUP2624A. 750kHz/1.2MHz Step-up DC/DC Converter
750kHz/1.2MHz Step-up DC/DC Converter DESCRIPTION The EUP2624A is a high performance current mode, PWM step-up converter with pin selectable operating frequency. With an internal 1.9A, 200m MOSFET, it
More informationDATASHEET EL1848. Features. Ordering Information. Applications. Typical Connection. White LED Step-Up Regulator. FN7427 Rev 0.
DATASHEET E1 White ED Step-Up Regulator FN2 Rev 0.00 The E1 is a constant current boost regulator specially designed for driving white EDs. It can drive EDs in series or up to 9 EDs in parallel/series
More informationTS19371 Boost (Step-up) WLED Driver with OVP
SOT-26 Pin Definition: 1. SW 6. VIN 2. GND 5. OVP 3. FB 4. CTRL SOP-8 Pin Definition: 1. VIN 8. SW 2. GND 7. GND 3. GND 6. GND 4. CTRL 5. FB General Description The TS19371 is a step-up DC/DC converter
More informationLM2703 Micropower Step-up DC/DC Converter with 350mA Peak Current Limit
Micropower Step-up DC/DC Converter with 350mA Peak Current Limit General Description The LM2703 is a micropower step-up DC/DC in a small 5-lead SOT-23 package. A current limited, fixed off-time control
More informationSGM3736 PWM Dimming, 38V Step-Up LED Driver
GENERAL DESCRIPTION The SGM3736 is a versatile constant current LED driver with a high efficiency step-up converter architecture. The low-side power MOSFET is integrated in the device, significantly shrinking
More informationSynchronous Step-up DC/DC Converter for White LED Applications
Synchronous Step-up DC/DC Converter for White LED Applications General Description The is a fixed-frequency step-up DC/DC converter that is ideal for driving white LEDs for display backlighting and other
More informationAME. Low Cost Micro Power Boost DC/DC Converter AME5170. General Description. Typical Application. Features. Applications AME5170 AME5170 AME5170
5170 General Description Typical Application The 5170 is a fixed off-time step-up DC/DC converter in a small SOT-25/TSOT-25A package.the 5170 is ideal for LCD panels requiring low current and high efficiency
More information1.5MHz, 800mA, High-Efficiency PWM Synchronous Step-Down Converter
1.5MHz, 800mA, High-Efficiency PWM Synchronous Step-Down Converter Description The is a high efficiency, low-noise, DC-DC step-down pulse width modulated (PWM) converter that goes automatically into PFM
More informationThe ASD5001 is available in SOT23-5 package, and it is rated for -40 to +85 C temperature range.
General Description The ASD5001 is a high efficiency, step up PWM regulator with an integrated 1A power transistor. It is designed to operate with an input Voltage range of 1.8 to 15V. Designed for optimum
More informationPWM Step-Up DC/DC Converter for Panel Backlight. Applications. Features. Fig. 1
PWM Step-Up DC/DC Converter for Panel Backlight General Description The is a highly efficient, step-up DC/DC converter for driving white LEDs. The device can drive up to 9 serially connected white LEDs
More informationHigh-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
19-2731; Rev 1; 10/03 EVALUATION KIT AVAILABLE High-Efficiency, 26V Step-Up Converters General Description The step-up converters drive up to six white LEDs with a constant current to provide backlight
More informationHigh-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs MAX1553/MAX1554
EVALUATION KIT AVAILABLE /MAX1554 General Description The /MAX1554 drive white LEDs in series with a constant current to provide efficient display backlighting in cellular phones, PDAs, and other hand-held
More informationAP5725 WHITE LED STEP-UP CONVERTER. Description. Pin Assignments. Applications. Features. Typical Application Circuit. L1 22uH C OUT CIN. 1uF.
Description Pin Assignments The is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive 2 ~ 6 LEDs in series from a Li-Ion cell. Series connection
More information1.0MHz,24V/2.0A High Performance, Boost Converter
1.0MHz,24V/2.0A High Performance, Boost Converter General Description The LP6320C is a 1MHz PWM boost switching regulator designed for constant-voltage boost applications. The can drive a string of up
More informationeorex EP MHz, 600mA Synchronous Step-down Converter
1.5MHz, 600mA Synchronous Step-down Converter Features High Efficiency: Up to 96% 1.5MHz Constant Switching Frequency 600mA Output Current at V IN = 3V Integrated Main Switch and Synchronous Rectifier
More informationHigh Voltage CMOS Boost White LED Driver
High Voltage CMOS Boost White LED Driver FEATURES Drives 6 to 8 White LEDs in series from 3V Up to 87% Efficiency Low Quiescent Ground Current 0.6mA Adjustable Output Current (up to 40mA) High Frequency
More informationESMT/EMP Preliminary EMD2055
Preliminary EMD2055 PWM Step-Up DC/DC Converter for Panel Backlight (11 WLEDs Driver) General Description The EMD2055 is a highly efficient, step-up DC/DC converter for driving white LEDs. The device can
More informationESMT Preliminary EMD2080
Constant Current LED Lighting Driver With PWM Dimming Control General Description The EMD2080 was designed with high efficiency step up DC/DC converter with constant current source for driving lighting
More informationLDS8710. High Efficiency 10 LED Driver With No External Schottky FEATURES APPLICATION DESCRIPTION TYPICAL APPLICATION CIRCUIT
High Efficiency 10 LED Driver With No External Schottky FEATURES High efficiency boost converter with the input voltage range from 2.7 to 5.5 V No external Schottky Required (Internal synchronous rectifier*)
More informationAP5724. Description. Pin Assignments. Features. Applications. Typical Applications Circuit. (Top View) U-DFN L1 22uH C OUT CIN. 1uF.
Pb WHITE LED STEP-UP CONVERTER Description The is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive 2 ~ 6 LEDs in series from a Li-Ion cell.
More informationYB1518 Step-up DC-DC Converter White LED Driver Description
Description The YB1518 is a step-up DC-DC converter; operates as current source to drive up to 6 white LEDs(VIN at 3.0V) or 8 LEDs(VIN at 3.5V) or 9 LEDs(VIN at 3.5V) in series. Series connecting of the
More informationWhite LED Driver ICs Monolithic IC MM3097
White LED Driver ICs Monolithic IC MM3097 Outline This IC is a white LED driver IC. It is a step-up DC-DC converter IC designed to drive up to 7 LEDs and suitable for backlight drivers. Feedback voltage
More informationHigh-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting MAX1582/MAX1582Y
19-2783; Rev 2; 8/05 EVALUATION KIT AVAILABLE High-Efficiency Step-Up Converters General Description The drive up to six white LEDs in series with a constant current to provide display backlighting for
More informationHigh Efficiency Low Noise PFM Step-Up DC/DC Converter UM1661 SOT23-6. Part Number Packaging Type Marking Code Shipping Qty UM1661 SOT23-6 LE9
High Efficiency Low Noise PFM Step-Up DC/DC Converter UM1661 SOT23-6 General Description The UM1661 PFM step-up DC/DC Converter drives white LEDs with a constant current to provide backlight in cell phones,
More informationTS1518 Step-Up DC-DC Converter, White LED Driver
SOT-25 Pin Definition: 1. SW 2. Ground 3. Feedback 4. CTRL 5. Input General Description The TS1518 is a step-up DC-DC converter; operates as current source to drive up to 6 white LEDs(V IN at 3.0V) or
More informationAIC1580/L. Step-Down DC/DC Controller with Shutdown FEATURES DESCRIPTION APPLICATIONS
Step-Down DC/DC Controller with Shutdown FEATURES Operation Voltage up to 15V. Simple Voltage-Mode PWM Control. Fast Transient Response. 2V and 1.3V ± 2% Feedback Voltage Reference Option. Adjustable Current
More informationA8431. White LED Driver Constant Current Step-up Converter
Features and Benefits Output voltage up to 32 V ( level) 2. to 0 V input Drives up to 4 LEDs at 20 ma from a 2. V supply Drives up to LEDs at 20 ma from a 3 V supply.2 MHz switching frequency 300 ma switch
More informationVIN VOUT + + GND SHDN AIC1731. Low Noise Low Dropout Linear Regulator
300mA, Low Dropout Linear Regulator with Shutdown FEATURES Active Low Shutdown Control. Very Low Quiescent Current. Very Low Dropout Voltage of 470mV at 300mA Output Current (3.0V Output Version) 1.3V,
More informationRT V DC-DC Boost Converter. Features. General Description. Applications. Ordering Information. Marking Information
RT8580 36V DC-DC Boost Converter General Description The RT8580 is a high performance, low noise, DC-DC Boost Converter with an integrated 0.5A, 1Ω internal switch. The RT8580's input voltage ranges from
More informationPS7516. Description. Features. Applications. Pin Assignments. Functional Pin Description
Description The PS756 is a high efficiency, fixed frequency 550KHz, current mode PWM boost DC/DC converter which could operate battery such as input voltage down to.9.. The converter output voltage can
More information1.5 MHz, 600mA Synchronous Step-Down Converter
GENERAL DESCRIPTION is a 1.5Mhz constant frequency, slope compensated current mode PWM step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency without an
More informationBCT3692B Small Package, High Performance, Asynchronies Boost for 10 WLED Driver
BCT3692B Small Package, High Performance, Asynchronies Boost for 10 WLED Driver Features 3.0V to 5.5V Input Voltage Range Internal Power N-MOSFET Switch Wide Range for PWM Dimming(20kHz to 60kHz) Minimize
More informationMT3540 Rev.V1.2. Package/Order Information. Pin Description. Absolute Maximum Ratings PIN NAME FUNCTION
1.5A, 1.2MHz, Up to 28V Output Micropower Step-up Converter FEATURES Integrated 0.5Ω Power MOSFET 40µA Quiescent Current 2.5V to 5.5V Input Voltage 1.2MHz Fixed Switching Frequency Internal 1.5A Switch
More information1MHz,30V/1.5A High Performance, Boost Converter
1MHz,30V/1.A High Performance, Boost Converter General Description The is a current mode boost DC-DC converter. Its PWM circuitry with built-in 1.A current power MOSFET makes this converter highly power
More informationMIC2296. General Description. Features. Applications. High Power Density 1.2A Boost Regulator
High Power Density 1.2A Boost Regulator General Description The is a 600kHz, PWM dc/dc boost switching regulator available in a 2mm x 2mm MLF package option. High power density is achieved with the s internal
More informationAT mA LED Driver w/ Internal Switch
FEATURES Up to 95% Efficiency 0.1V Current Sense Threshold Voltage 5V to 36V Input Voltage Range Driving up to 30LEDs (1W 10S3P) at DC36V IN Up to 1MHz Oscillation Frequency Continuous 1A Output Capability
More informationFeatures. Applications
White LED Driver Internal Schottky Diode and OVP General Description The is a PWM (pulse width modulated), boostswitching regulator that is optimized for constant-current white LED driver applications.
More informationBCT3756 Small Package, High Performance, Asynchronies Boost for 8 Series WLED Driver
BCT3756 Small Package, High Performance, Asynchronies Boost for 8 Series WLED Driver Features 3.0V to 5.5V Input Voltage Range Internal Power N-MOSFET Switch Wide Range for PWM Dimming(10kHz to 100kHz)
More information10A Current Mode Non-Synchronous PWM Boost Converter
10A Current Mode Non-Synchronous PWM Boost Converter General Description The is a current mode boost DC-DC converter. It is PWM circuitry with built-in 15mΩ power MOSFET make this regulator highly power
More informationUM1660. Low Power DC/DC Boost Converter UM1660S SOT23-5 UM1660DA DFN AAG PHO. General Description
General Description Low Power DC/DC Boost Converter S SOT23-5 DA DFN6 2.0 2.0 The is a PFM controlled step-up DC-DC converter with a switching frequency up to 1MHz. The device is ideal to generate output
More informationEUP MHz, 800mA Synchronous Step-Down Converter with Soft Start
1.5MHz, 800mA Synchronous Step-Down Converter with Soft Start DESCRIPTION The is a constant frequency, current mode, PWM step-down converter. The device integrates a main switch and a synchronous rectifier
More informationFP6276B 500kHz 6A High Efficiency Synchronous PWM Boost Converter
500kHz 6A High Efficiency Synchronous PWM Boost Converter General Description The is a current mode boost DC-DC converter with PWM/PSM control. Its PWM circuitry with built-in 40mΩ high side switch and
More informationAT V 5A Synchronous Buck Converter
FEATURES DESCRIPTION Wide 8V to 38V Operating Input Range Integrated 80mΩ Power MOSFET Switches Output Adjustable from VFB(1V) to 20V Up to 95% Efficiency Internal Soft-Start Stable with Low ESR Ceramic
More informationRT4503/A. Asynchronous Boost Converter for 10 WLEDs. Features. General Description. Ordering Information. Applications. Simplified Application Circuit
Asynchronous Boost Converter for 1 WLEDs General Description The is a highly integrated LED driver IC capable of driving 1 WLEDs in series. It is composed of a current mode Boost converter integrated with
More informationACT111A. 4.8V to 30V Input, 1.5A LED Driver with Dimming Control GENERAL DESCRIPTION FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT
4.8V to 30V Input, 1.5A LED Driver with Dimming Control FEATURES Up to 92% Efficiency Wide 4.8V to 30V Input Voltage Range 100mV Low Feedback Voltage 1.5A High Output Capacity PWM Dimming 10kHz Maximum
More informationACT MHz, 600mA Synchronous Step Down Converter in SOT23-5 GENERAL DESCRIPTION FEATURES APPLICATIONS. Data Sheet Rev 0, 5/2006
Data Sheet Rev 0, 5/2006 ACT6906 1.6MHz, 600mA Synchronous Step Down Converter in SOT23-5 FEATURES High Efficiency - Up to 95% Very Low 24µA Quiescent Current Guaranteed 600mA Output Current 1.6MHz Constant
More informationLow-Noise 4.5A Step-Up Current Mode PWM Converter
Low-Noise 4.5A Step-Up Current Mode PWM Converter FP6298 General Description The FP6298 is a current mode boost DC-DC converter. It is PWM circuitry with built-in 0.08Ω power MOSFET make this regulator
More informationAT V,3A Synchronous Buck Converter
FEATURES DESCRIPTION Wide 8V to 40V Operating Input Range Integrated 140mΩ Power MOSFET Switches Output Adjustable from 1V to 25V Up to 93% Efficiency Internal Soft-Start Stable with Low ESR Ceramic Output
More informationEUP A,30V,1.2MHz Step-Down Converter DESCRIPTION FEATURES APPLICATIONS. Typical Application Circuit
1.2A,30V,1.2MHz Step-Down Converter DESCRIPTION The is current mode, step-down switching regulator capable of driving 1.2A continuous load with excellent line and load regulation. The can operate with
More informationSGM V Step-Up LED Driver
GENERAL DESCRIPTION The SGM3725 is a versatile constant current LED driver with a high efficiency step-up converter architecture. Unique technology and high 1.35A current limit allow SGM3725 to drive up
More informationTS mA / 1.5MHz Synchronous Buck Converter
SOT-25 Pin Definition: 1. EN 2. Ground 3. Switching Output 4. Input 5. Feedback General Description The TS3406 is a high efficiency monolithic synchronous buck regulator using a 1.5MHz constant frequency,
More informationDIO V Step-Up LED Driver with PWM to Constant Current Dimming Mode
Rev 0.2 DIO5061 37V Step-Up LED Driver with PWM to Constant Current Dimming Mode Features Drive up to 10 serial LEDs PWM to Constant Current dimming mode Integrated 40V high current switch (1.3A limit)
More informationSINO SN5802 High Efficiency 1.2MHz 2A Step Up Converter
SN1085L Electronics High Efficiency 1.2MHz 2A Step Up Converter Description The is a constant frequency, 6-pin SOT23-6L current mode step-up converter intended for small, low power applications. The switches
More informationFeatures. Applications
White LED Driver Internal Schottky Diode and OVP General Description The is a PWM (pulse width modulated), boostswitching regulator that is optimized for constant-current white LED driver applications.
More informationAT V Synchronous Buck Converter
38V Synchronous Buck Converter FEATURES DESCRIPTION Wide 8V to 38V Operating Input Range Integrated two 140mΩ Power MOSFET Switches Feedback Voltage : 220mV Internal Soft-Start / VFB Over Voltage Protection
More informationAdvanced Monolithic Systems
Advanced Monolithic Systems FEATURES Internal Power Switch Output Voltage up to 20V Up to 89% Efficiency Low 0.08µA Shutdown Supply Current Internal Current Limit Thermal Shutdown Available in 5-Pin SOT-23
More informationTS3410 1A / 1.4MHz Synchronous Buck Converter
SOT-25 Pin Definition: 1. EN 2. Ground 3. Switching Output 4. Input 5. Feedback General Description TS3410 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current
More informationGS SS14 AIC AIC AIC AIC EXT GND. 100mA Load Current Step-Up Converter
1-Cell, 3-Pin, Step-Up DC/DC Controller FEATURES A Guaranteed Start-Up from less than 0.9 V. High Efficiency. ow Quiescent Current. ess Number of External Components needed. ow Ripple and ow Noise. Fixed
More informationNon-Synchronous PWM Boost Controller
Non-Synchronous PWM Boost Controller FP5209 General Description The FP5209 is a boost topology switching regulator for wide operating voltage applications. It provides built-in gate driver pin, EXT pin,
More informationFP A Current Mode Non-Synchronous PWM Boost Converter
10A Current Mode Non-Synchronous PWM Boost Converter General Description The is a current mode boost DC-DC converter. It is PWM circuitry with built-in 15mΩ power MOSFET make this regulator highly power
More informationSUN MHz, 800mA Synchronous Step-Down Converter GENERAL DESCRIPTION EVALUATION BOARD APPLICATIONS. Typical Application
GENERAL DESCRIPTION The is a 1.5MHz constant frequency, slope compensated current mode PWM stepdown converter. The device integrates a main switch and a synchronous rectifier for high efficiency without
More informationMicro Power Boost Regulator Series White LED Driver L1 D1 SP6691 GND
Micro Power Boost Regulator Series White LED Driver FEATURES Drives up to 6 LEDs @ 5mA Drives up to 8 LEDs @ 0mA High Output Voltage: Up to 0V Optimized for Single Supply,.7V - Applications Operates Down
More information