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| 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 Pb-Free Package: SOP-8L 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. Pin Assignments ( Top View ) Pin Descriptions Pin Name FB CE/SS SVcc PVcc SW GND FB CE/SS SVcc PVcc 1 2 3 4 AP1635 8 GND 7 GND 6 SW 5 SW Pin No. 1 Description Feedback pin Chip Enable/ Soft Start: 2 H: Enable L: Disable IC signal power supply pin, add a 3 20 resistor to PVcc and a 0.1F capacitor to GND. 4 IC power supply pin Switch Pin. Connect external 5/6 inductor/diode here. Minimize trace area at this pin to reduce EMI. 7/8 GND Pin Applications * * * * * Electronic Information Organizers Palmtops Cellular and portable phones Portable Audio Systems Various Multi-function Power Supplies AP1635 Rev. 3 1 of 7 www.diodes.com OCTOBER 2006 (c) Diodes Incorporated AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Ordering Information AP 1635 X X X Package S: SOP-8L Lead Free Packing -U : Tube -13 : Taping L : Lead Free Device AP1635S Package Packaging Code S SOP-8L Tube or Bulk -13" Tape and Reel Part Number Quantity Part Number Quantity Suffix Suffix 2500/Tape & Reel -13 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 AP1635 Rev. 3 2 of 7 www.diodes.com OCTOBER 2006 (c) Diodes Incorporated AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Absolute Maximum Ratings Ta=25C Units V V V V Symbol VCC/SVCC VSW VFB VCE/SS Pd Topr Tstg Parameter VIN Pin Voltage SW Pin Voltage FB Pin Voltage CE/SS Pin Voltage Continuous Total Power Dissipation Operating Ambient Temperature Storage Temperature 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 C C Electrical Characteristics VIN=5V, VOUT2V, Load=300mA, Ta=25C Sym. VFB VIN Parameter FB Input Voltage Line Regulation Load Regulation UVLO Voltagemin. operating voltage Operating Current 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 A A A mA kHz % % V V % m VIN=2.2~5V, Load=10mA IOUT=10~1200mA VCC, voltage required to maintain H at VUVLO VOUT ICC CE/SS=VIN, No Load No external components, ICCQ Supply Current CE/SS=VIN, VFB=1.2V No external components, ISTB Stand-by Current CE/SS=0V, VFB=0V peak current ICL Current Limit VIN=5V, VOUT=2V Fosc Oscillator Frequency Load=300mA, VIN=5V, VOUT=2V MAXDTY Maximum Duty Ratio PFMDTY PFM Duty Ratio No load Apply 1.4V (min.) to CE/SS, determine VCEH CE/SS "High" Voltage VOUT "High" VCEL CE/SS "Low" Voltage Same as VCEH, determine VOUT/"Low" EFFI Efficiency VCC=5V, VOUT=3.3V, Load=300mA Rdson Rdson Condition IOUT=300mA, VIN=5V, VOUT=2V AP1635 Rev. 3 3 of 7 www.diodes.com OCTOBER 2006 (c) Diodes Incorporated AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Typical Performance Characteristics Vcc v.s. Operating Current 200 180 160 Vcc v.s. Quiescent Current 200 180 160 140 120 100 80 60 40 20 0 2.5 3 3.5 4 4.5 5 Icc (uA) Operating Current (uA) 140 120 100 80 60 40 20 0 2.5 3 3.5 4 4.5 5 Quiescent Current (uA) Vcc (V) Vcc (V) Vcc v.s. 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 v.s. Frequency Stand-by Current (uA) 7 6.5 6 5.5 5 4.5 4 Frequency (KHz) Vcc (V) 3 3.5 Vcc (V) 4 4.5 5 Vcc v.s. Current Limit Vcc v.s. RDS(ON) AP1635 Rev. 3 4 of 7 www.diodes.com OCTOBER 2006 (c) Diodes Incorporated AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER 1.4 1.3 1.2 600 500 Current Limit (A) 1 0.9 0.8 0.7 0.6 0.5 3 Current Limit RDS(ON) (m) Vout=2V 1.1 400 300 200 100 0 3.5 4 4.5 5 2.5 3 3.5 Vcc (V) Vcc (V) 4 4.5 5 Typical Performance Characteristics (Continued) Line Regulation 0.3 0.2 0.1 3 2 1 Load Regulation 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 Vcc (V) 0 200 400 Load (mA) 600 800 1000 1200 Typical Application Circuit 2.2V ~ 5.5V V IN 20 68u 0.1uF 1nF 1M 10uH VOUT B240A FB R1 0.1uF 68uF R2 PVcc AP1635 SVcc CE/SS GND SW Vout = 1 x (1 + R2 ) R1 R1=100K ~ 200K AP1635 Rev. 3 5 of 7 www.diodes.com OCTOBER 2006 (c) Diodes Incorporated AP1635 PWM/PFM DUAL MODE STEP-DOWN DC/DC CONVERTER Marking Information ( Top View ) 8 5 Logo AP1635 YY WW X Part no. ID code: internal Xth week: 01~52 Year: "01" =2001 "02" =2002 ~ 1 4 SOP-8L Package Information Package Type: SOP-8L 3.70/4.10 5.79/6.20 0.08/0.25 0.254 0.38/1.27 Gauge Plane Seating Plane Detail "A" 7~9 1.30/1.50 1.75max. 0.20typ 7~9 0.35max. 45 Detail "A" 3.70/4.10 1.27typ 4.80/5.30 0.3/0.5 AP1635 Rev. 3 6 of 7 www.diodes.com OCTOBER 2006 (c) 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. 3 7 of 7 www.diodes.com OCTOBER 2006 (c) Diodes Incorporated |
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