Product Brief CHARGE PUMP CURRENT SOURCE FOR LED DRIVER WITH BRIGHTNESS CONTROL Description BCD Semiconductor Manufacturing Limited AP3605 Parametric Table 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. Input Voltage (V) Supply Current (Typ) (mA) 1.5 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. Operating Frequency (Typ) (MHz) 1.0 Efficiency (Typ) (%) 93 The AP3605 supply voltage range is from 2.7V to 5.5 V, ideally suited for applications powered by the Li-ion battery. Package 2.7 to 5.5 Output Current (Max) (mA) 120 Current Matching (Min/Max) (%) ±3 Soft Start Time (Typ) (µS) 400 Standby Time (Typ) (ms) 2.0 QFN-3x316 The AP3605 is available in a 3mm*3mm QFN-3x3-16 tiny package. Its operating temperature range is -40oC to 85oC Features IMPORTANT NOTICE Benefits or Manufacturing Limited reserves the right to make changes without further notice to any products or specifi· its products Wide Input Voltage Range RegulatedLimited Outputdoes Current with ±3% Matching for use of any D Semiconductor·Manufacturing not assume any responsibility for any High Current · Regulated ±10% Output Current Source nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of· the application or useMatching Precision or circuits. BCD· Semiconductor Manufacturing Limited does not convey any license under patent rights or to Make PWM Dimming Control · itsBuilt-in Standby Drive up to 4 LEDs at 20 mA Each rights of others.· Wide Operating Voltage Range: 2.7V to 5.5V Optimized · High Efficiency up to 93% BCD Semiconductor Manufacturing Limited High Operating Frequency: 1MHz - IC Design Group · Built-in Soft-Start to Limit the Inrush Current nductor Manufacturing Limited Advanced Analog Circuits (Shanghai) Corporation 200233, China 8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China Additional Available · LED Brightness ControlTel:through Analog +86-21-5450 0008 +86-21-6495PWM 9539, Fax:and +86-21-6485 9673 Signal FFICE · Samples USA Office · Built-in Standby ModeTaiwan to Office Make PWM Dimming nductor Manufacturing Co., Ltd. Shenzhen Office BCD Semiconductor (Taiwan) Company Limited BCD Corporation ·Semiconductor Preliminary Datasheet Control Shanghai) Corporation Shenzhen Office Optimized 4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei, 30920 Huntwood Ave. Hayward, o.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China Taiwan CA· 94544, U.S.A Demo Board · Built-in OTSD (Over Temperature Shutdown) FuncTel: +886-2-2656 2808 Tel : +1-510-324-2988 ·+1-510-324-2788 Application Note Fax:from +886-2-2656 2806 Fax: tion to Protect the Device Burn Out · ESD Report anufacturing 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 16 http://www.bcdsemi.com D4 1 VOUT 2 PGND 3 C2- 4 15 D1 VIN 14 13 EP 5 6 7 12 EN 11 ISET 10 AGND 9 C1+ 8 VIN C1- C2+ VOUT Ordering Information Example Package Temperature Range Part Number Marking ID Packing Type QFN-3x3-16 -40 to 85oC AP3605FNTR-E1 F1A Tape & Reel IMPORTANT NOTICE or Manufacturing Limited reserves the right to make changes without further notice to any products or specifiD Semiconductor Manufacturing Limited does notrefer assume anyrelevant responsibility for use of any its products for any Detailed information please to the datasheet. nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or rights of others. anufacturing Limited BCD Semiconductor Manufacturing Limited nductor Manufacturing Limited 200233, China +86-21-5450 0008 - 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 FFICE nductor Manufacturing Co., Ltd. Shenzhen Office Shanghai) Corporation Shenzhen Office o.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China Sales Office: 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 USA 30920 Huntwood Ave. Hayward, CA 94544, USA Tel : +1-510-324-2988 Fax : +1-510-324-2788 Shanghai 8F, B Zone, 900 Yi Shan Road, Shanghai 200233, China Tel : 86-21-6495 9539 Fax : 86-21-6485 9673 Taiwan 4F, 298-1 Rui Guang Road, Nei-Hu District, Taipei, Taiwan Tel : 886-2-2656-2808 Fax : 886-2-2656-2806 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