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| Product Brief CHARGE PUMP CURRENT SOURCE FOR LED DRIVER WITH BRIGHTNESS CONTROL AP3605 Description BCD Semiconductor Manufacturing Limited The AP3605 is a step-up DC/DC converter based on 1.5x charge pump current source, it is specially designed for LED supplies in backlight display. The AP3605 can provide constant current up to 20mA for http://www.bcdsemi.com each LED, which is programmed by an external resistor, so it has a total capability to provide 80 mA for 4 LEDs. The chip has a good performance of LED current matching and allows PWM brightness dimming control. Additionally, high switching frequency up to 1 MHz enables the use of two small external flying capacitors. Internal soft-start circuitry prevents excessive inrush current during start-up. The AP3605 supply voltage range is from 2.7V to 5.5 V, ideally suited for applications powered by the Li-ion battery. The AP3605 is available in a 3mm*3mm QFN-3x3-16 tiny package. Its operating temperature range is -40oC to 85oC Parametric Table Input Voltage (V) Supply Current (Typ) (mA) Operating Frequency (Typ) (MHz) Efficiency (Typ) (%) 2.7 to 5.5 1.5 1.0 93 Output Current (Max) (mA) Current Matching (Min/Max) (%) Soft Start Time (Typ) (S) Standby Time (Typ) (ms) 120 3 400 2.0 Package QFN-3x316 Features IMPORTANT NOTICE Benefits r Manufacturing Limited reserves the right to make changes without further notice to any products or specifi* Wide Input Voltage Range * Regulated Output Current with any Matching Semiconductor Manufacturing Limited does not assume3%responsibility for use of any its products for any * Regulated 10% Output Current Source or does BCD Semiconductor Manufacturing Limited assume any liability arising out of* application or use the High Current Matching Precision r circuits. BCD Semiconductor to 4 LEDs at 20 mA Each not convey any license under itsBuilt-in Standby to Make PWM Dimming Control patent rights or * * Drive up Manufacturing Limited does ights of others.* Wide Operating Voltage Range: 2.7V to 5.5V Optimized High Efficiency up to 93% BCD 1MHz High Operating Frequency: Semiconductor Manufacturing Limited - IC Design Group * Built-in Soft-Start to Limit the Analog Circuits (Shanghai) Corporation ductor Manufacturing Limited Advanced Inrush Current 200233, China 8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China Additional Available * LED Brightness Control through PWM and Analog 86-21-5450 0008 Tel: +86-21-6495 9539, Fax: +86-21-6485 9673 Signal FICE * Samples USA Office * Built-in Standby ModeTaiwan Office PWM Dimming to Make ductor Manufacturing Co., Ltd. Shenzhen Office BCD Semiconductor (Taiwan) Company Limited BCD Semiconductor Corporation * Preliminary Datasheet Control hanghai) Corporation Shenzhen Office Optimized 4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei, 30920 Huntwood Ave. Hayward, .1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China Taiwan CA 94544, U.S.A * Demo Board * Built-in OTSD (Over Temperature 2808 Tel: +886-2-2656 Shutdown) FuncTel : +1-510-324-2988 * Application Note Fax: +886-2-2656 2806 Fax: +1-510-324-2788 tion to Protect the Device from Burn Out * ESD Report nufacturing Limited * * Materials Applications * * * Mobile Phone MP3, MP4 White LED Backlight in Mobile Phone, PDA Jul. 2007 BCD Semiconductor Manufacturing Limited Product Brief CHARGE PUMP CURRENT SOURCE FOR LED DRIVER WITH BRIGHTNESS CONTROL AP3605 Pin Configuration BCD Semiconductor Manufacturing Limited Pin 1 Identification QFN-3x3-16 D3 D2 D1 14 VIN 13 12 http://www.bcdsemi.com D4 VOUT PGND C21 2 3 4 16 15 EN ISET AGND C1+ EP 5 6 7 8 11 10 9 VIN C1- C2+ VOUT Ordering Information Example Package QFN-3x3-16 Temperature Range -40 to 85oC Part Number AP3605FNTR-E1 Marking ID F1A Packing Type Tape & Reel IMPORTANT NOTICE r Manufacturing Limited reserves the right to make changes without further notice to any products or specifiSemiconductor Manufacturing Limited does not assume the relevant datasheet. of any its products for any Detailed information please refer to any responsibility for use or does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use r circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or ights of others. nufacturing Limited ductor Manufacturing Limited 200233, China 86-21-5450 0008 BCD Semiconductor Manufacturing Limited - IC Design Group Advanced Analog Circuits (Shanghai) Corporation 8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6495 9539, Fax: +86-21-6485 9673 FICE ductor Manufacturing Co., Ltd. Shenzhen Office hanghai) Corporation Shenzhen Office .1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China Taiwan Office BCD Semiconductor (Taiwan) Company Limited 4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei, Taiwan Tel: +886-2-2656 2808 Fax: +886-2-2656 2806 USA Office BCD Semiconductor Corporation 30920 Huntwood Ave. Hayward, CA 94544, U.S.A Tel : +1-510-324-2988 Fax: +1-510-324-2788 Sales Office: USA 30920 Huntwood Ave. Hayward, CA 94544, USA Tel : +1-510-324-2988 Fax : +1-510-324-2788 Taiwan 4F, 298-1 Rui Guang Road, Nei-Hu District, Taipei, Taiwan Tel : 886-2-2656-2808 Fax : 886-2-2656-2806 Shanghai 8F, B Zone, 900 Yi Shan Road, Shanghai 200233, China Tel : 86-21-6495 9539 Fax : 86-21-6485 9673 Shenzhen Room E, 5F, Noble Center, No.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China Tel : 86-755-8826 7951 Fax : 86-755-8826 7865 Jul. 2007 BCD Semiconductor Manufacturing Limited |
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