AP1635_09 DIODES | Alldatasheet
Document overview
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Technical content
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER AP1635 Rev. 4 1 of 8 FEBRUARY 2009 www.diodes.com © Diodes Incorporated Lead-free
- Input voltage range: 2.2V~5V (V OUT type)
- Oscillator frequency: 700KHz (Typ.)
- Internal reference: 1.0V (Typ.)
- High efficiency: 93% (Typ.)
- Current limit and thermal shutdown protection
- Lead Free Package: SOP-8L
- SOP-8L: Available in “Green” Molding Compound (No Br, Sb)
- Lead Free Finish/ RoHS Compliant (Note 1) The AP1635 series are multi-functional step-down DC/DC converters with built-in speed, low ON resistance drivers. It is capable to deliver more than 1.2A output current with external coil, diode and capacitor. Output voltage is set-up by the external resistors. (±2.5% accuracy). The 700KHz AP1635 that can work out with small value external components comes out more compact board. The device switches to and works under PFM mode with light loads. It keeps at high efficiency for both light loads and large output current. AP1635 can be soft-start with a proper capacitor connected between CE/SS pin and ground. The stand-by current is less than 6uA when CE/SS pin is at “LOW” status. The device is forced to switch off as the voltage at that pin is lower than the stipulated voltage.
Applications
- Electronic Information Organizers
- Palmtops
- Cellular and portable phones
- Portable Audio Systems
- Various Multi-function Power Supplies
Ordering Information
13 : Tape & Reel G : Green S : SOP-8L L : Lead Free Device Package Code Packaging (Note 2) 13” Tape and Reel Quantity Part Number Suffix AP1635SL-13 S SOP-8L 2500/Tape & Reel -13 AP1635SG-13 S SOP-8L 2500/Tape & Reel -13 Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. Features General Description
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER AP1635 Rev. 4 2 of 8 FEBRUARY 2009 www.diodes.com © Diodes Incorporated Pin Assignments FB SWSVcc SW CE/SS GND GND PVcc ( Top View ) SOP-8L Pin Descriptions Pin Name Pin No. Description FB 1 Feedback pin CE/SS 2 Chip Enable/ Soft Start: H: Enable L: Disable SVcc 3 IC signal power supply pin, add a 20Ω resistor to PVcc and a 0.1µF capacitor to GND. PVcc 4 IC power supply pin SW 5/6 Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin to reduce EMI. GND 7/8 GND Pin
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER AP1635 Rev. 4 3 of 8 FEBRUARY 2009 www.diodes.com © Diodes Incorporated Block Diagram Phase Compensation Vref with CE PWM/PFM Controller Ramp Wave Generator, OSC SW CE/SS GND PVcc PWM Comparator FB Current Limit Soft Start ERR AMP SVcc Absolute Maximum Ratings (TA=25°C) Symbol Parameter Ratings Units VCC/SVCC V IN Pin Voltage -0.3 ~ 5.0 V VSW SW Pin Voltage -0.3 ~ V IN+0.3 V VFB FB Pin Voltage -0.3 ~ V IN+0.3 V VCE/SS CE/SS Pin Voltage -0.3 ~ V IN+0.3 V PD Continuous Total Power Dissipation Internal limited TOPR Operating Ambient Temperature -25 ~ +80 °C TSTG Storage Temperature -40 ~ +125 °C
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER AP1635 Rev. 4 4 of 8 FEBRUARY 2009 www.diodes.com © Diodes Incorporated
Electrical Characteristics
VIN=5V, VOUT＝2V, Load=300mA, TA=25°C Symbol Parameter Conditions Min Typ. Max Units VFB FB 0.975 1.0 1.025 V VIN Input Voltage 2.2 - 5 V Line Regulation V IN=2.2~5V, Load=10mA - - 0.12 % Load Regulation I OUT=10~1200mA - - 1.2 % VUVLO UVLO Voltage（min. operating voltage） VCC, voltage required to maintain H at VOUT - - 2 V ICC Operating Current CE/SS=V IN, No Load - 100 150 μA ICCQ Supply Current No external components, CE/SS=VIN, VFB=1.2V - 90 120 μA ISTB Stand-by Current No external components, CE/SS=0V, VFB=0V - 6 - μA ICL Current Limit Peak current V IN=5V, VOUT=2V 1200 1400 1600 mA Fosc Oscillator Frequency Load=300mA, V IN=5V, VOUT=2V 500 700 - kHz MAXDTY Maximum Duty Ratio 85 90 - % PFMDTY PFM Duty Ratio No load 15 25 35 % VCEH CE/SS ”High” Voltage Apply 1.4V (min.) to CE/SS, determine VOUT “High” 1.4 - - V VCEL CE/SS ”Low” Voltage Same as V CEH, determine VOUT/“Low” - - 0.6 V EFFI Efficiency V CC=5V, VOUT=3.3V, Load=300mA - 93 - % Rdson Rdson Condition I OUT=300mA, VIN=5V, VOUT=2V - 350 450 m Ω
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER AP1635 Rev. 4 5 of 8 FEBRUARY 2009 www.diodes.com © Diodes Incorporated Typical Performance Characteristics Vcc vs. Operating Current Vcc vs. Quiescent Current Icc (uA) 100 120 140 160 180 200 2.5 3 3.5 4 4.5 5 Vcc (V) Operating Current (uA) 100 120 140 160 180 200 2 . 533 . 544 . 55 Vcc (V) Quiescent Current (uA) Vcc vs. Stand-by Current Vcc vs. Frequency 4.5 5.5 6.5 7.5 2 . 533 . 544 . 55 Vcc (V) Stand-by Current (uA) 600 620 640 660 680 700 720 740 760 780 800 2.5 3 3.5 4 4.5 5 Vcc (V) Frequency (KHz) Vcc vs. Current Limit Vcc vs. RDS(ON) 0.5 0.6 0.7 0.8 0.9 1.1 1.2 1.3 1.4 33 . 544 . 55 Vcc Current Limit (A) Current Limit Vout=2V 100 200 300 400 500 600 2.5 3 3.5 4 4.5 5 RDS (ON ) (mΩ) Vcc (V)
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER AP1635 Rev. 4 6 of 8 FEBRUARY 2009 www.diodes.com © Diodes Incorporated Typical Performance Characteristics (Continued) Line Regulation Load Regulation -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 2.5 3 3.5 4 4.5 5 Vcc (V) V / VOUT (%) 0 200 400 600 800 1000 1200 Load (mA) V / VOUT (%) Typical Application Circuit 0.1uF VIN FB PVcc GND 10uH AP1635 SW CE/SS 2.2V ~ 5.5V B240A R2 R1 0.1uF 68uF VOUT 1nF SVcc Ω Ω 68u Vout = 1×(1 + R2 ) R1=100K ~ 200K
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER AP1635 Rev. 4 7 of 8 FEBRUARY 2009 www.diodes.com © Diodes Incorporated Marking Information (1) SOP-8L ( Top View ) AP1635 YY WW X X Logo Part Number WW : Week : 01~52; 52 YY : Year : 08, 09,10~ G : Green X : Internal Code represents 52 and 53 week L : Lead Free Package Information (All Dimensions in mm) (1) Package Type: SOP-8L 1.27typ 0.3/0.5 7°~9° 4.85/4.95 3.85/3.95 5.90/6.10 0.15/0.25 7°~9° 0.62/0.82 0.10/0.20 Gauge Plane 0.254 Seating Plane 0.35max. 45° Detail "A" Detail "A" 1.30/1.50 1.75max. Land Pattern Recommendation (Unit: mm) 6x-1.27 8x-1.55 8x-0.60 5.4 0°/8°
PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER AP1635 Rev. 4 8 of 8 FEBRUARY 2009 www.diodes.com © Diodes Incorporated IMPORTANT NOTICE LIFE SUPPORT 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. 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.