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AAT3103 Datasheet(PDF) 1 Page - Advanced Analog Technology, Inc. |
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AAT3103 Datasheet(HTML) 1 Page - Advanced Analog Technology, Inc. |
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1 / 17 page  AAT3103 3-Channel Charge-Pump LED Driver ChargePumpTM PRODUCT DATASHEET 3103.2008.03.1.0 1 www .analogictech.com General Description The AAT3103 is a constant frequency charge-pump based current-source white LED driver capable of driving one to three LEDs up to 30mA, each. The charge pumps auto- matically switch between 1x mode and 2x mode to main- tain the highest efficiency and optimal LED current accu- racy and matching. A low external parts count (one 1μF flying capacitor, two small 1μF capacitors at IN and OUT and one current setting resistor) makes the AAT3103 ide- ally suited for small battery-powered applications. The AAT3103-1/-2 uses AnalogicTech's Simple Serial Control™ (S2Cwire™) interface to enable, disable, and program the LED driving current. The AAT3103-4 employs a Pulse Width Modulation (PWM) signal with up to 50kHz frequency, 10% to 100% duty cycle to program the LED current. A low-current shutdown feature disconnects the load from IN and reduces quiescent current to less than 1μA. Built-in soft-start circuitry prevents excessive inrush current during start-up. Integrated short circuit and ther- mal protection circuitry protects the device from damage. The AAT3103 is available in a 2x2.1mm thermally enhanced Pb-free 10-lead SC70JW-10 package. Features • Source WLED Driver, up to 3 LEDs at up to 30mA, each • Automatic Switching Between 1x and 2x Modes • 900KHz Switching Frequency • Linear LED Output Current Control ▪ Single-wire, S2Cwire Interface AAT3103-1: 16-step AAT3103-2: 8-step ▪ ON/OFF or PWM Interface AAT3103-4 • ±10% LED Output Current Accuracy • ±3% LED Output Current Matching • Low-current Shutdown Mode • Built-in Short Circuit and Thermal Protection • Automatic Soft-start • 2x2.1mm SC70JW-10 Package Applications • Cordless Phone Handsets • Mobile Phone Handsets • MP3 and PMP Players • Digital Cameras Typical Application Input Voltage 2.7V to 5.5V EN/SET S2Cwire Interface IN C+ C- EN/SET OUT D1 D2 D3 RSET RSET 14.3k Ω COUT 1μF AGND WLEDs OSRAM LW M 678 or equivalent AAT3103-1 CP 1μF CIN 1μF |
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