General Description
The AAT3164 is a low noise, constant frequency charge pump DC/DC converter that uses a trimode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED applications. The device is capable of driving up to six channels of LEDs at up to 30mA per channel from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher-current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at IN and OUT) makes this part ideally suited for small, battery-powered applications.

FEATUREs
• VIN Range: 2.7V to 5.5V
• Tri-Mode (1X/1.5X/2X) Charge Pump Operation
    — Maximizes Efficiency and LED VF Coverage
    — 1MHz Constant Switching Frequency
    — No Inductors, Low Noise Operation
• Drives Six Channels of LEDs up to 30mA/ Channel
    — User-Programmable RSET Sets Maximum LED Current
    — Excellent LED Channel-to-Channel Current Match
• Digitally Programmable LED Current with Single-Wire S2Cwire Interface
    — 16 Current Levels From ILED_MAX to 50µA
• Low IQ (70µA) for Low Current Mode Operation
• True Load Disconnect in Shutdown; IQ < 1µA
• Built-In Thermal Protection
• Built-In Auto-Disable for Open LED Circuit
• Automatic Soft-Start Minimizes Inrush Startup Current
• Small 3x4mm TDFN34-16 Package

APPLICATIONs
• Color (RGB) Lighting
• Programmable Current Sinks
• White LED Backlighting
• White Photo Flash for Digital Still Cameras