General Description
The AAT3104 is a charge-pump based, current-source white LED driver capable of driving one to four LEDs up to 30mA, each. It automatically switches between 1x mode and 2x mode to maintain the highest efficiency and optimal LED current accuracy and matching.
The AAT3104 charge pump’s 1x mode (bypass mode) has very low resistance allowing LED current regulation to be maintained with input supply voltage approaching the LED forward voltage.
LED brightness is controlled using AnalogicTech’s patented S2Cwire™ single wire interface. The AAT3104 is available in a 2x2mm 10-lead SC70JW-10 package.

Features
*Drives up to 4 LEDs at up to 31mA each
*Automatic Switching Between 1x and 2x Modes
*1MHz Switching Frequency
*Linear LED Output Current Control
*Single-wire, S2Cwire Interface
-AAT3104-1: 16-step
-AAT3104-2: 32-step
*±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
*Cordless Phone Handsets
*Digital Cameras
*Mobile Phone Handsets
*MP3 and PMP Players

AAT3104IJQ-1-T1, AAT3104IJQ-2-T1

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General Description
The AAT2806 is a dual charge pump designed to support both the white LED backlight and flash applications for systems operating with lithium-ion/polymer batteries. The backlight charge pump is capable of driving up to four LEDs at a total of 80mA. The current sinks may be operated individually or in parallel for driving higher current LEDs. To maximize power efficiency, the charge pump operates in 1X, 1.5X, or 2X mode, where the mode of operation is automatically selected by comparing the forward voltage of each LED with the input voltage. AnalogicTech's S2Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with an eight-level logarithmic scale plus four low-current settings down to 50μA for optimized efficiency, with a typical operating quiescent current of less than 50μA.
The flash charge pump is a charge pump doubler with a regulated output voltage. It is designed to deliver 120mA of continuous current and up to 250mA of pulsed current. It has an independent
enable pin for improved power savings.
The AAT2806 has thermal protection and built-in softstart circuitry. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1μA.
The AAT2806 is available in a Pb-free, space-saving, thermally-enhanced TDFN44-16 package and is rated over the -40°C to +85°C temperature range.

Features
*VIN Range: 2.7V to 5.5V
*Dual Charge Pump to Support Backlight and Flash LEDs
*Backlight Charge Pump:
-Regulated Current
-Four Current Sink Inputs
-S2Cwire Brightness Control
-Tri-Mode Charge Pump
-Maximum 20mA of Current Per Input
-Low IQ (50μA) in Light Load Mode
*Flash Charge Pump:
-Regulated Output Voltage
-Up to 250mA of Pulsed Current
*Independent Backlight/Flash Control
*Low Noise 1MHz Constant Frequency Operation
*Automatic Soft Start
*No Inductors
*Available in TDFN44-16 Package

Applications
*Color (RGB) Lighting
*White LED Backlighting
*White LED Photo Flash

AAT2806IXN-4.5-T1

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