AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER General Description Features • • • • • • • • 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. Input voltage range: 2.2V~5V (VOUT 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) 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 AP 1635 S X - 13 Device Lead-free AP1635SL-13 AP1635SG-13 Notes: Package Lead Free Packing S : SOP-8L L : Lead Free G : Green 13 : Tape & Reel Package Code S S Packaging (Note 2) SOP-8L SOP-8L 13” Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 2500/Tape & Reel -13 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. AP1635 Rev. 4 1 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Pin Assignments ( Top View ) FB 1 8 GND CE/SS 2 7 GND SVcc 3 6 SW PVcc 4 5 SW SOP-8L Pin Descriptions Pin Name Pin No. Description FB 1 CE/SS 2 SVcc 3 PVcc 4 SW 5/6 GND 7/8 Feedback pin Chip Enable/ Soft Start: H: Enable L: Disable IC signal power supply pin, add a 20Ω resistor to PVcc and a 0.1µF capacitor to GND. IC power supply pin Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin to reduce EMI. GND Pin AP1635 Rev. 4 2 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Block Diagram SVcc FB + - SW PWM/PFM Controller Vref with CE Absolute Maximum Ratings Symbol VCC/SVCC VSW VFB VCE/SS PD TOPR TSTG AP1635 Rev. 4 Current Limit + ERR AMP Soft Start CE/SS PVcc Phase Compensation - PWM Comparator Ramp Wave Generator, OSC GND (TA=25°C) Parameter VIN Pin Voltage SW Pin Voltage FB Pin Voltage CE/SS Pin Voltage Continuous Total Power Dissipation Operating Ambient Temperature Storage Temperature 3 of 8 www.diodes.com Ratings Units -0.3 ~ 5.0 -0.3 ~ VIN+0.3 -0.3 ~ VIN+0.3 -0.3 ~ VIN+0.3 Internal limited -25 ~ +80 -40 ~ +125 V V V V °C °C FEBRUARY 2009 © Diodes Incorporated AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Electrical Characteristics VIN=5V, VOUT＝2V, Load=300mA, TA=25°C Symbol Parameter VFB FB VIN Input Voltage Line Regulation Load Regulation UVLO Voltage（min. VUVLO operating voltage） ICC Operating Current ICCQ Supply Current ISTB Stand-by Current ICL Current Limit Fosc Oscillator Frequency MAXDTY Maximum Duty Ratio PFMDTY PFM Duty Ratio VCEH VCEL EFFI Rdson Conditions Min 0.975 2.2 - Typ. 1.0 - Max 1.025 5 0.12 1.2 Units V V % % VCC, voltage required to maintain H at VOUT - - 2 V CE/SS=VIN, No Load No external components, CE/SS=VIN, VFB=1.2V No external components, CE/SS=0V, VFB=0V Peak current VIN=5V, VOUT=2V Load=300mA, VIN=5V, VOUT=2V - 100 150 μA - 90 120 μA - 6 - μA 1200 1400 1600 mA 500 85 15 700 90 25 35 kHz % % 1.4 - - V - 93 350 0.6 450 V % mΩ VIN=2.2~5V, Load=10mA IOUT=10~1200mA No load Apply 1.4V (min.) to CE/SS, determine CE/SS ”High” Voltage VOUT “High” CE/SS ”Low” Voltage Same as VCEH, determine VOUT/“Low” Efficiency VCC=5V, VOUT=3.3V, Load=300mA Rdson Condition IOUT=300mA, VIN=5V, VOUT=2V AP1635 Rev. 4 4 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Typical Performance Characteristics Vcc vs. Operating Current Vcc vs. Quiescent Current 200 200 Icc (uA) 180 180 Quiescent Current (uA) Operating Current (uA) 160 140 120 100 80 60 40 20 160 140 120 100 0 80 60 40 20 0 2.5 3 3.5 4 4.5 2.5 5 3 3.5 Vcc vs. Stand-by Current 4.5 5 Vcc vs. Frequency 8 800 7.5 780 760 7 Frequency (KHz) Stand-by Current (uA) 4 Vcc (V) Vcc (V) 6.5 6 5.5 5 4.5 740 720 700 680 660 640 620 4 600 2.5 3 3.5 4 4.5 5 2.5 Vcc (V) 3 3.5 4 4.5 5 4 .5 5 Vcc (V) Vcc vs. Current Limit Vcc vs. RDS(ON) 1.4 600 1.3 500 1.1 RDS(ON) (mΩ) Current Limit (A) 1.2 Current Limit 1 0.9 0.8 0.7 400 300 200 100 0.6 Vout=2V 0 0.5 3 3.5 4 4.5 5 Vc c AP1635 Rev. 4 5 of 8 www.diodes.com 2.5 3 3.5 Vcc (V) 4 FEBRUARY 2009 © Diodes Incorporated AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Typical Performance Characteristics (Continued) Load Regulation 0.3 3 0.2 2 0.1 1 V / VOUT (%) V / VOUT (%) Line Regulation 0.0 -0.1 -0.2 0 -1 -2 -0.3 -3 2.5 3 3.5 4 4.5 5 0 200 400 600 800 1000 1200 Load (mA) Vcc (V) Typical Application Circuit 10uH 2.2V ~ 5.5V V IN PVcc 20Ω 68u 1MΩ AP1635 SVcc CE/SS GND SW VOUT B240A R2 FB R1 0.1uF 0.1uF 68uF 1nF Vout = 1 × (1 + R2 ) R1 R1=100K ~ 200K AP1635 Rev. 4 6 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Marking Information (1) SOP-8L ( Top View ) 5 8 L : Lead Free G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal Code Logo AP1635 YY WW X X Part Number 1 Package Information 4 (All Dimensions in mm) 0.254 0.10/0.20 3.85/3.95 5.90/6.10 (1) Package Type: SOP-8L Gauge Plane Seating Plane 0.62/0.82 Detail "A" 7°~9° 0.15/0.25 1.30/1.50 1.75max. 0.35max. 45° 7°~9° Detail "A" 0°/8° 0.3/0.5 1.27typ 4.85/4.95 5.4 8x-0.60 8x-1.55 6x-1.27 Land Pattern Recommendation (Unit: mm) AP1635 Rev. 4 7 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER 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. AP1635 Rev. 4 8 of 8 www.diodes.com FEBRUARY 2009 © Diodes Incorporated