AP1635

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