MIC4575. Features. General Description. Applications. Typical Application. 200kHz Simple 1A Buck Regulator
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1 00kHz Simple 1A Buck Regulator General Description The is a series of easy to use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 00kHz duplicates the pinout and function of the 5kHz LM575. The higher switching frequency may allow up to a :1 reduction in output filter inductor size. The is available in., and 5 fixed output versions or a 1. to 0 adjustable output version. Both versions are capable of driving a 1A load with excellent line and load regulation. The feedback voltage is guaranteed to ±% tolerance for adjustable versions, and the output voltage is guaranteed to ±% for fixed versions, within specified voltages and load conditions. The oscillator frequency is guaranteed to ±10%. In shutdown mode, the regulator draws less than 00µA standby current. The regulator performs cycle-by-cycle current limiting and thermal shutdown for protection under fault conditions. This series of simple switch-mode regulators requires a minimum number of external components and can operate using a standard series of inductors. Frequency compensation is provided internally. The is available in TO-0 (T) and TO-6 (U) packages for the industrial temperature range. Data sheets and support documentation can be found on Micrel s web site at Features Fixed 00kHz operation., 5, and adjustable output versions oltage over specified line and load conditions: Fixed version: ±% max. output voltage Adjustable version: ±% max. feedback voltage Guaranteed 1A switch current Wide to input voltage range Wide 1. to 0 output voltage range Requires minimum external components < 00µA typical shutdown mode 75% efficiency (adjustable version > 75% typical) Standard inductors and capacitors are5% of typical LM575 values Thermal shutdown Overcurrent protection 100% electrical thermal limit burn-in Applications Simple high-efficiency step-down (buck) regulator Efficient pre-regulator for linear regulators On-card switching regulators Positive-to-negative converter (inverting buck-boost) Battery charger Negative boost converter Step-down 6 to. for Intel Pentium and similar microprocessors Typical Application Shutdown Enable 8 to C1 150µF SHDN SW -5.0_T FB GND L1 68µH D1 1N /1A C 0µF 16 Fixed Regulator Adjustable Regulator Pentium is a registered trademark of Intel Corporation Micrel Inc. 180 Fortune Drive San Jose, CA 9511 USA tel +1 (08) fax + 1 (08) July M
2 Ordering Information Part Number Standard RoHS Compliant* oltage Temperature Range Package -.BT -.WT. 0 to +85 C 5-Pin TO-0-5.0BT -5.0WT to +85 C 5-Pin TO-0 BT WT Adj. 0 to +85 C 5-Pin TO-0 -.BU -.WU. 0 to +85 C 5-Pin TO-6-5.0BU -5.0WU to +85 C 5-Pin TO-6 BU WU Adj. 0 to +85 C 5-Pin TO-6 * RoHS compliant with high-melting solder exemption. Pin Configuration TAB 5 SHDN FB GND SW 1 IN 5-Pin TO-0 (T) 5-Pin TO-6 (U) Pin Description Pin Number Pin Name Pin Function 1 IN Supply oltage (Input): Unregulated + to +0 supply voltage. SW Switch (Output): Emitter of NPN output switch. Connect to external storage inductor and Shottky diode., TAB GND Ground. FB Feedback (Input): Output voltage feedback to regulator. Connect to output of supply for fixed versions. Connect to 1. tap of resistive divider for adjustable versions. 5 SHDN Shutdown (Input): Logic low enables regulator. Logic high (>.) shuts down regulator. July 009 M
3 Absolute Maximum Ratings Supply oltage ( ) (1)...+0 Shutdown oltage ( SHDN ) to +6 Output Switch ( SW )... 1 Storage Temperature (T s ) C to 150 C ESD () Operating Ratings Supply oltage ( )...+ Junction Temperature (T J ) C Package Thermal Resistance TO-0, TO-6 (θ JA )...65 C/W TO-0, TO-6 (θ JC )... C/W Electrical Characteristics () = 1; I LOAD = 00mA; T J = 5 C, bold values indicate 0 C< T J < +85 C, unless noted. Parameter Condition Min Typ Max Units [Adjustable] Feedback oltage Feedback oltage 8, 0.A I LOAD 1A Efficiency I LOAD = 1A, OUT = 5 77 % Feedback Bias Current Output oltage...66 Output oltage 6, 0.A I LOAD 1A Efficiency I LOAD = 1A 7 % -5.0 Output oltage Output oltage 8, 0.A I LOAD 1A Efficiency I LOAD = 1A 77 % / -. / -5.0 Oscillator Frequency khz Saturation oltage I OUT = 1A Maximum Duty Cycle (On) FB connected to % Current Limit Peak Current, t ON µs Output Leakage Current =, FB connected to 0 Output = 0 Output = Quiescent Current 5 10 ma Standby Quiescent Current SHDN = 5 (regulator off) µa SHDN Input Logic Level OUT = 0 (regulator off).. SHDN Input Current na na A A ma ma 1. OUT =. or 5 (regulator on) SHDN = 5 (regulator off) SHDN = 0 (regulator on) 10 Notes: 1. The is not guaranteed to survive a short circuit to ground for input voltage above.. Devices are ESD sensitive. Handling precautions recommended µa µa July 009 M
4 Functional Diagram Block Diagram with External Components Fixed Step-Down Regulator Block Diagram with External Components Adjustable Step-Down Regulator July 009 M
5 Functional Description The is a variable duty cycle switch-mode regulator with an internal power switch. Refer to the block diagrams. Supply oltage The operates from a + to + unregulated input. Highest efficiency operation is from a supply voltage around +15. Enable/Shutdown The shutdown (SHDN) input is TTL compatible. Ground the input if unused. A logic-low enables the regulator. A logic-high shuts down the internal regulator which reduces the current to typically 50µA. Feedback Fixed versions of the regulator have an internal resistive divider from the feedback (FB) pin. Connect FB directly to the output line. Adjustable versions require an external resistive voltage divider from the output voltage to ground, connected from the1. tap to FB. Duty Cycle Control A fixed-gain error amplifier compares the feedback signal with a 1. bandgap voltage reference. The resulting error amplifier output voltage is compared to a 00kHz sawtooth waveform to produce a voltage controlled variable duty cycle output. A higher feedback voltage increases the error amplifier output voltage. A higher error amplifier voltage (comparator inverting input) causes the comparator to detect only the peaks of the sawtooth, reducing the duty cycle of the comparator output. A lower feedback voltage increases the duty cycle. Output Switching When the internal switch is on, an increasing current flows from the supply, through external storage inductor L1, to output capacitor C OUT and the load. Energy is stored in the inductor as the current increases with time. When the internal switch is turned off, the collapse of the magnetic field in L1 forces current to flow through fast recovery diode D1, charging C OUT. Output Capacitor External output capacitor C OUT provides stabilization and reduces ripple. Return Paths During the on portion of the cycle, the output capacitor and load currents return to the supply ground. During the off portion of the cycle, current is being supplied to the output capacitor and load by storage inductor L1, which means that D1 is part of the high-current return path. July M
6 Application Information The applications circuits that follow have been constructed and tested. Refer to Application Note 15 for additional information, including efficiency graphs and manufacturer s addresses and telephone numbers for most circuits. For a mathematical approach to component selection and circuit design, refer to Application Note 1. Figure. 6 to./1a Buck Converter Low-Profile Surface Mount Figure 1. 6 to./1a Buck Converter Through Hole Figure 5. 8 to 5/1A Buck Converter Low-Profile Surface Mount 16 to C1 68µF 6 Figure. 8 to 5/1A Buck Converter Through Hole 5 SHDN SW BT FB GND 1 L1 150µH MBR160 R 1.0k R1 1.50k 1/1A C 0µF 16 Figure to 1/1A Buck Converter Low-Profile Surface Mount C1 Nichicon C Nichicon D1 Motorola MBR160 L1 Sumida Figure. 16 to 1/1A Buck Converter Through Hole Note : Surface-mount component. Figure 7. 6 to./1a Buck Converter Lower-Cost Surface Mount July M
7 Figure 8. 8 to 5/1A Buck Converter Lower-Cost Surface Mount Figure to 5/0.A Buck-Boost Converter Through Hole Figure to 1/1A Buck Converter Lower-Cost Surface Mount Figure to 5/0.A Buck-Boost Converter Through Hole 8 to 18 C1 µf SHDN SW BU FB GND T1 68µH L1 1µH 1 D1 MBRS10LT C 0µF 10 R.01k R1 1.00K C 00pF OUT 5/1A 5m P-P C 0µF 10 C1 AX C AX C AX D1 Motorola MBRS10LT T1 Coiltronics L1 Coilcraft DO1608C-10 Figure 1. Low Output-Noise Regulator (5m Output Ripple ) July M
8 8 to 18 C1 µf SHDN SW BU FB GND D1 MBRS10LT T1 68µH 1 R.01k R1 1.00K C 00pF + OUT /+I OUT 5/0.5A C 0µF 10 C5 0µF 10 L1 D MBRS10LT C 0µF 10 C1 AX C AX C AX C5 AX D1 Motorola MBRS10LT D Motorola MBRS10LT T1 Coiltronics +I + I A DC % then I 0% then I (1 DC) - OUT /-I OUT -5/0.5A at 15 Load Regulation 5% Figure 1. Split ±5 Supply Figure 1. Adjustable (0 1) Output-oltage Regulator 5 SHDN U1 SW L1 68µH OUT 1/1A to 15 C1 150µF 5 1 BT FB GND D1 1N R1 9 U LM58 R 1.00k C 0µF 16 R 1k C1 C D1 L1 U Motorola 1N5819 National LM58 Figure 15. Low Output-oltage Regulator (1) July M
9 Figure 16. 1A Battery Charger (6 8 cells) D 8 to C1 150µF SHDN SW -BT FB GND U1 Micrel BT U National LM58 U Micrel LM01CIZ-1. C1 Nichicon C Nichicon D1 Motorola 1N5819 D Motorola 1N5819 D Motorola 1N18 L1 Coiltronics R1 KRL SP-1-A1-0R100J Q1 Siliconix NLL / R7 1k R6 k C 1000pF 1N18 1 D1 1N5819 C 0.01µF L1 68µH DZ1 1N5 1 UA 1/LM58 R1 0.1 C R 0µF R 1.1k R 10k 7 Q1 NLL 8 5 UB 1/ LM58 6 D 1N5819 R5 10k R1 10k I OUT 0.1A to 1A -8 Cells BATT U LM01CIZ-1. Figure A 1A ariable-current Battery Charger July M
10 Figure 18. 1A Battery Charger ( 8 Cells) Figure 19. Remote-Sensing Regulator July M
11 Figure to Split ±1/100mA Supply Figure 1. 1A Battery Charger July M
12 Figure. Improved Adjustable Output-oltage Regulator (0 1) Figure. Switchable Battery-Pack Charger July M
13 Figure. Lithium-Ion Battery Charger with End-of-Charge Flag Figure 5. Low Output-Noise Regulator (<1m) July M
14 Package Information 5-Pin TO-0 (T) 5-Pin TO-6 (U) July M
15 MICREL, INC. 180 FORTUNE DRIE SAN JOSE, CA 9511 USA TEL +1 (08) FAX +1 (08) WEB The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale Micrel, Incorporated. July M
16 Mouser Electronics Authorized Distributor Click to iew Pricing, Inventory, Delivery & Lifecycle Information: Microchip: -5.0WU WT -.WU WU -5.0WT -.WT -.WU- TR -5.0WU-TR WU-TR
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More informationMIC2298. Features. General Description. Applications. Typical Application. 3.5A Minimum, 1MHz Boost High Brightness White LED Driver
3.5A Minimum, 1MHz Boost High Brightness White LED Driver General Description The is a high power boost-switching regulator that is optimized for constant-current control. The is capable of driving up
More informationMIC3975. General Description. Features. Applications. Ordering Information. Typical Applications. 750mA µcap Low-Voltage Low-Dropout Regulator
MIC3975 750mA µcap Low-Voltage Low-Dropout Regulator General Description The MIC3975 is a 750mA low-dropout linear voltage regulators that provide low-voltage, high-current output from an extremely small
More informationMIC37501/ General Description. Features. Applications. Typical Applications. 5A, Low Voltage μcap LDO Regulator
MIC375/375, Low Voltage μcap LDO Regulator General Description The MIC375 and MIC375 are, low dropout linear voltage regulator that provide low voltage, high current outputs with a minimum of external
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 informationMIC94040/1/2/3. Features. General Description. Applications. Typical Application. 28mΩ R DSON 3A High Side Load Switch in 1.2mm x 1.
28mΩ R DSON 3A High Side Load Switch in 1.2mm x 1.2mm MLF package General Description The is a family of high-side load switches designed to operate from 1.7V to 5.5V input voltage. The load switch pass
More informationMIC2282. Features. General Description. Applications. Typical Application. Single-Cell Ultra Low EMI Boost LED Driver
Single-Cell Ultra Low EMI Boost LED Driver General Description The is a boost LED driver optimized for single cell operation from alkaline, nickel-metal-hydride, or lithium ion batteries. The operates
More informationMIC5388/9. Features. General Description. Applications. Typical Application. Dual 200mA Peak LDO in Wafer Level Chip Scale Package
Dual 2mA Peak LDO in Wafer Level Chip Scale Package General Description The is an advanced dual LDO ideal for powering general purpose portable devices. The provides two independently-controlled, highperformance,
More informationMIC94090/1/2/3/4/5. Features. General Description. Applications. Typical Application. High Side Load Switches for Consumer Applications
High Side Load Switches for Consumer Applications General Description The is a family of high-side load switches designed for operation from 1.7V to 5.5V input voltage. The load switch pass element is
More informationMIC5271. Applications. Low. output current). Zero-current off mode. and reduce power. GaAsFET bias Portable cameras. le enable pin, allowing the user
µcap Negative Low-Dropout Regulator General Description The is a µcap 100mA negativee regulator in a SOT-23-this regulator provides a very accurate supply voltage for applications that require a negative
More informationFeatures. 5V Reference UVLO. Oscillator S R GND*(AGND) 5 (9) ISNS 3 (5)
MIC38HC42/3/4/5 BiCMOS 1A Current-Mode PWM Controllers General Description The MIC38HC4x family are fixed frequency current-mode PWM controllers with 1A drive current capability. Micrel s BiCMOS devices
More informationMIC5235. General Description. Features. Applications. Typical Application. Ultra-Low Quiescent Current, 150mA µcap LDO Regulator
MIC535 Ultra-Low Quiescent Current, 5mA µcap LDO Regulator General Description The MIC535 is a 5mA highly accurate, low dropout regulator with high input voltage and ultra-low ground current. This combination
More informationMIC2215. Features. General Description. Applications. Typical Application. Triple High PSRR, Low Noise µcap LDO
Triple High PSRR, Low Noise µcap LDO General Description The is a high performance, triple LDO voltage regulator, with each regulator capable of providing 250mA continuous output current. Ideal for battery
More informationSP3613. Order Information PIN CONFIGURATIONN PIN NAME DISCRIPTION TYPICAL APPLICATION. 1 VIN Input
60, 3A STEP DOWN OLTAGE SWITCHING REGULATOR DESCRIPTION The SP3613 series is designed to provide all the active function for a step-down (buck) switching regulator, and drives a maximum load current as
More informationPackage K5 : TO263-5L T5 : TO220-5L T5R : TO220-5L(R)
Features General Description oltage: 3.3, 5, 12 and Adjustable ersion Adjustable ersion oltage Range, 1.23 to 18+4% 150KHz +15% Fixed Switching Frequency oltage Mode Non-Synchronous PWM Control Thermal-Shutdown
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LMC7 LMC7 Low-Power Operational Amplifier Final Information General Description The LMC7 is a high-performance, low-power, operational amplifier which is pin-for-pin compatible with the National Semiconductor
More informationAP1506. Package T5: TO220-5L L : K5: TO263-5L T5R: TO220-5L(R)
Features General Description oltage: 3.3, 5, 12 and Adjustable ersion Adjustable ersion oltage Range, 1.23 to 18+4% 150KHz +15% Fixed Switching Frequency oltage Mode Non-Synchronous PWM Control Thermal-Shutdown
More informationMIC5524. Features. General Description. Applications. Typical Application. High-Performance 500mA LDO in Thin DFN Package
High-Performance 500mA LDO in Thin DFN Package General Description The is a low-power, µcap, low dropout regulator designed for optimal performance in a very-small footprint. It is capable of sourcing
More informationMIC5248. Features. General Description. Applications. Typical Application. 150mA µcap CMOS LDO Regulator w/power Good VIN VOUT C OUT GND
150mA µcap CMOS LDO Regulator w/power Good General Description The is an efficient, general purpose 1.2V CMOS voltage regulator with a power good output function. The offers better than 3%initial accuracy,
More informationAT7450 2A-60V LED Step-Down Converter
FEATURES DESCRIPTION IN Max = 60 FB = 200m Frequency 52kHz I LED Max 2A On/Off input may be used for the Analog Dimming Thermal protection Cycle-by-cycle current limit I LOAD max =2A OUT from 0.2 to 55
More informationMIC2177. General Description. Features. Applications. Typical Application. 2.5A Synchronous Buck Regulator
2.5A Synchronous Buck Regulator General Description The Micrel is a 200kHz synchronous buck (stepdown) switching regulator designed for high-efficiency, battery-powered applications. The operates from
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MIC532 15mA ULDO in Ultra-Small 1.2mm x 1.6mm Thin MLF General Description The MIC532 is an ultra-small, ultra-low dropout CMOS regulator, ULDO that is ideal for today s most demanding portable applications
More informationMIC2142. General Description. Features. Applications. Typical Application. Micropower Boost Converter
Micropower Boost Converter General Description The is a micropower boost switching regulator housed in a SOT3-5 package. The input voltage range is between.v to 16V, making the device suitable for onecell
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MIC56 Low Quiescent Current µcap LDO Regulator General Description The MIC56 is a low quiescent current, µcap low-dropout regulator. With a maximum operating input voltage of V and a quiescent current
More information3A, 52kHz, Step-Down Switching Regulator LM2576
3A, 52kHz, StepDown Switching Regulator LM2576 FEATURES 3.3V, 5.0V, 12V and Adjustable Output Versions Adjustable Version Output Voltage Range, 1.23 to 37V +/ 4% AG10Maximum Over Line and Load Conditions
More informationFeatures MIC1555 VS MIC1557 VS OUT 5
MIC555/557 MIC555/557 IttyBitty RC Timer / Oscillator General Description The MIC555 IttyBitty CMOS RC timer/oscillator and MIC557 IttyBitty CMOS RC oscillator are designed to provide rail-to-rail pulses
More informationMIC2172/3172. General Description. Features
100kHz 1.25A Switching Regulators General Description The MIC2172 and MIC3172 are complete 100kHz SMPS current-mode controllers with internal 65 1.25A power switches. The MIC2172 features external frequency
More informationFeatures. Applications V IN ENABLE SHUTDOWN. C IN = 1.0µF
300mA High PSRR, Low Noise µcap CMOS LDO General Description The is an efficient CMOS voltage regulator optimized for low-noise applications. It offers 1.5% initial accuracy, low dropout voltage (300mV
More informationMIC5316. General Description. Features. Applications. Typical Application. Low Voltage Dual 300mA LDO with Power on Reset and Voltage Select
Low Voltage Dual 300mA LDO with Power on Reset and Voltage Select General Description The is a high performance, dual low input voltage, low dropout regulator with Power On Reset (POR) and voltage select.
More informationMIC5365/6. General Description. Features. Applications. Typical Application. High-Performance Single 150mA LDO
High-Performance Single 150mA LDO General Description The is an advanced general purpose linear regulator offering high power supply rejection (PSRR) in an ultra-small 1mm 1mm package. The MIC5366 includes
More informationMIC2238. General Description. Features. Applications. Typical Application. 2.5MHz Dual Phase PWM Buck Regulator
2.5MHz Dual Phase PWM Buck Regulator General Description The Micrel is dual output 2-phase synchronous buck (step down) PWM DC/DC switching regulator. Power conversion efficiencies of above 95% are easily
More informationFeatures OUT 3,8 D1 MBRS140 PGND. 10k
.5A Synchronous Buck Regulator General Description The Micrel is a 0kHz synchronous buck (stepdown) switching regulator designed for high-efficiency, battery-powered applications. The operates from a 4.5V
More informationMIC38C42A/43A/44A/45A
MIC38C42A/43A/44A/45A BiCMOS Current-Mode PWM Controllers General Description The MIC38C4xA are fixed frequency, high performance, current-mode PWM controllers. Micrel s BiCMOS devices are pin compatible
More informationFeatures. MIC5253-x.xBC5 V IN. Ultra-Low-Noise Regulator Application
1mA Low Noise µcap Teeny LDO General Description The is an efficient, CMOS voltage regulator optimized for ultra-low-noise applications. It offers 1.5% initial accuracy, extremely low dropout voltage (165mV
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