Package Packaging. Lead Free G : Green

Transcription

1 Features General Description Input voltage: 4.4 to 18 Output voltage: 0.8 to CC. Duty ratio: 0% to 99% PWM control Oscillation frequency: 300KHz typ. Current limit, Enable function Thermal Shutdown function Builtin internal SW Pchannel MOS SOP8L: Available in Green Molding Compound (no Br, Sb) Lead Free Finish/RoHS Compliant (Note 1) AP1534 consists of stepdown switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS. AP1534 provides lowripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to vary the duty ratio linearly from 0 up to 99%. This converter also contains an error amplifier circuit as well as a softstart circuit that prevents overshoot at startup. An enable function, an over current protect function and a short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced from 300KHz to 50KHz. Also, an internal compensation block is built in to minimize external component count. With the addition of an internal Pchannel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as stepdown switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP8L minipackages, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 18, it is also suitable for the operation via an AC adapter. Applications PC Motherboard LCD Monitor Graphic Card DDideo Player Telecom Equipment ADSL Modem Printer and other Peripheral Equipment Microprocessor Core Supply Ordering Information A P X X X Package S : SOP8L Lead Free G : Green Packing U : Tube 13 : Tape & Reel Note: 1. RoHS revision Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7. Tube 13 Tape and Reel Package Packaging Device Code (Note 2) Quantity Part Number Quantity Part Number Suffix Suffix AP1534S S SOP8L 100 U 2500/Tape & Reel 13 Note: 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at AP1534 Rev. 2 1 of 8 DECEMBER 2007

2 Pin Assignments 1 8 ss 2 3 AP ss Output CC 4 5 Output SOP8L Pin Descriptions Pin Name Pin No. Description 1 Feedback pin 2 Poweroff pin H: Normal operation (Stepdown operation) L: Stepdown operation stopped (All circuits deactivated) 3 Add an external resistor to set max output current CC 4 IC power supply pin Output 5, 6 SS 7, 8 GND Pin Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin to reduce EMI AP1534 Rev. 2 2 of 8 DECEMBER 2007

3 Block Diagram Output cc Oscillation Circuit Reference oltage Source Thermal Shutdown PWMSwitched Control Circuit 100uA ss Absolute Maximum Ratings Symbol Parameter Rating Unit ESD HBM Human Body Model ESD Protection 4.5 K ESD MM Machine Model ESD Protection 150 CC CC Pin oltage SS 0.3 to SS 20 Feedback Pin oltage SS 0.3 to CC Pin oltage SS 0.3 to IN OUT Switch Pin oltage SS 0.3 to IN P D Power Dissipation Internally limited mw T J Operating Junction Temperature Range 20 to 125 T ST Storage Temperature Range 40 to 150 Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. o C o C Recommended Operating Conditions Symbol Parameter Min Max Unit IN Input oltage I OUT Output Current 0 2 A T A Operating Ambient Temperature o C AP1534 Rev. 2 3 of 8 DECEMBER 2007

4 Electrical Characteristics ( IN = 12, T A = 25 C, unless otherwise specified ) Symbol Parameter Conditions Min Typ. Max Unit Feedback oltage I OUT = 0.1A I Feedback Bias Current I OUT = 0.1A µa I SW Switch Current 2.0 A I SHDN Current Consumption During Power Off = 0 10 µa OUT / IN OUT / OUT Line Regulation IN = 5~ % Load Regulation I OUT = 0.1 to 2A % f OSC Oscillation Frequency Measure waveform at SW pin KHz f OSC1 Frequency of Current Limit or Short Circuit Protect Measure waveform at SW pin 50 KHz IH Evaluate oscillation at SW pin 2.0 Pin Input oltage IL Evaluate oscillation stop at SW pin 0.8 I SH Pin Input Leakage 20 µa I SL Current 10 µa I Pin Bias Current µa R DS(ON) Internal MOSFET R DS(ON) IN = 5, = IN = 12, = mω EFFI Efficiency IN = 12, OUT = 5 I OUT = 2A 91 % T SHDN Thermal shutdown threshold 150 C T HYS Thermal shutdown hysteresis 55 C θ JA Thermal Resistance JunctiontoAmbient SOP8L (Note 3) 127 o C/W θ JC Thermal Resistance JunctiontoCase SOP8L (Note 3) 28 o C/W Note: 3. Test condition for SOP8L: Device mounted on FR4 substrate PC board, 2oz copper, with minimum recommended pad layout. For better thermal performance, larger copper pad for heatsink is needed. Typical Application Circuit IN cc Output 22uH L1 OUT =5/2A C IN 470uF Ccc 0.1uF R 5.6K C Option R 100K C 0.1uF AP1534 SS C C Optional D1 B240A (Note 4) R A 6.8K R B 1.3K C 0.1uF C OUT 470uF Note: OUT = x (1R A /R B ) R B =0.7K~5K ohm Note: 4. Suggested DIODES Power Schottky P/N: B240/B340 series. AP1534 Rev. 2 4 of 8 DECEMBER 2007

5 Typical Performance Characteristics FOSC (khz) IN vs Frequency ( OUT =3.3, I OUT =0.2A) IN () () IN vs ( OUT =3.3, I OUT =0.2A) IN () OUTCHANGE (%) 3.0% 2.0% 1.0% 0.0% 1.0% 2.0% 3.0% Line Regulation ( OUT =3.3, I OUT =0.2A) IN () OUTCHANGE (%) Load Regulation ( IN =5, OUT =3.3) 1.0% 0.8% 0.6% 0.4% 0.2% 0.0% 0.2% 0.4% 0.6% 0.8% 1.0% I OUT (A) Efficiency OUT= OUT= I OUT (A) Efficiency (%) AP1534 Rev. 2 5 of 8 DECEMBER 2007

6 Typical Performance Characteristics (Continued) out Ripple (in=5, out=3.3, Iout=0.1A) out Ripple (in=5, out=3.3, Iout=2A) Test Circuit A CC open OUTPUT SS open Oscillation A CC OUTPUT SS Enable function test Feedback function test CC OUTPUT SS Operation function test AP1534 Rev. 2 6 of 8 DECEMBER 2007

7 Function Description PWM Control The AP1534 is a DC/DC converter that employs pulse width modulation (PWM) scheme. Its pulse width varies in the range of 0% to 99%, based on the output current loading. The output ripple voltage caused by the PWM high frequency switching can easily be reduced through an output filter. Therefore, this converter provides a low ripple output supply over a broad range of input voltage & output current loading Under oltage Lockout The under voltage lockout circuit of the AP1534 assures that the highside MOSFET driver remains in the off state whenever the supply voltage drops below 3.3. Normal operation resumes once CC rises above 3.5. Current Limit Protection The current limit threshold is set by external resistor R connected from CC supply to pin. The internal sink current I (90uA typical) across this resistor sets the voltage at pin. When the PWM voltage is less than the voltage at, an overcurrent condition is triggered. The current limit threshold is given by the following equation: I R = I PEAK DS(ON) R where, I PEAK > I Δ I = IN OUT (MAX) FSxL OUT ( ΔI) 2 x OUT IN I PEAK is the output peak current; R DS (ON) is the MOSFET ON resistance; F S is the PWM frequency (300KHz typical). Also, the inductor value will affect the ripple current ΔI. The above equation is recommended for input voltage range of 5 to 18. For input voltage lower than 5, higher than 18 or ambient temperature over 100 C, R 6.8KΩ is recommended. The recommended minimum R value is summarized below: IN () OUT () R (Ω) K K K K The maximum R value should not exceed AP1533 maximum current output. Marking Information Logo Part No. ( Top iew ) 8 AP1534 YYWWX X SOP8L G : Green Internal code Xth week: 01~52 Year : "07" = 2007 "08" = 2008 ~ AP1534 Rev. 2 7 of 8 DECEMBER 2007

8 Package Information (All Dimensions in mm) 3.70/ / / /1.27 Detail "A" Gauge Plane Seating Plane 7 ~9 0.35max ~9 1.30/ max. 0.20typ Detail "A" 1.27typ 0.3/ / /4.10 8x0.60 6x1.27 8x Land Pattern Recommendation (Unit: mm) IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated. AP1534 Rev. 2 8 of 8 DECEMBER 2007