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AAT3192 Datasheet(PDF) 1 Page - Advanced Analogic Technologies |
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AAT3192 Datasheet(HTML) 1 Page - Advanced Analogic Technologies |
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1 / 17 page  AAT3192/93 Low-Cost, 2-/3-Channel Charge-Pump LED Drivers 3193.2007.05.1.0 1 ChargePump™ General Description The AAT3192 and AAT3193 are charge-pump based, current-sink white LED drivers capable of driving one to three LEDs up to 30mA, each. They automatically switch between 1x mode and 2x mode to maintain the highest efficiency and opti- mal LED current accuracy and matching. The AAT3192/93 charge pump’s 1x mode (bypass mode) has very low resistance allowing LED cur- rent regulation to be maintained with input supply voltage approaching the LED forward voltage. The AAT3192 and the AAT3193 are available in a 2x2mm 10-lead SC70JW-10 packages. Features • Drives up to 3 LEDs at up to 30mA, each • Automatic Switching Between 1x and 2x Modes • 0.9MHz Switching Frequency • Linear LED Output Current Control — Single-wire, S 2Cwire Interface • AAT3192/93-1: 16-step • AAT3192/93-2: 8-step • AAT3192/93-3: 4-step — ON/OFF or PWM Interface • AAT3192/93-4 • ±10% LED Output Current Accuracy • ±3% LED Output Current Matching • Low-current Shutdown Mode • Built-in Thermal Protection • Automatic Soft-start • Available in 2x2mm SC70JW-10 Package Applications • Low-cost Cordless Phone Handsets • Low-cost Digital Cameras • Low-cost Mobile Phone Handsets • Low-cost MP3 and PMP Players Typical Application Input Voltage 2.7V to 5.5V IN C+ C- EN/SET OUT D1 D2 RSET RSET 14.3k Ω EN/SET S2Cwire Interface CIN 1μF CP 1μF COUT 1μF GND AAT3192-1 WLEDs OSRAM LW M 678 or equivalent 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 GND WLEDs OSRAM LW M 678 or equivalent AAT3193-1 CP 1μF CIN 1μF |
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