AAT3164

High Efficiency 1X/1.5X/2X Charge Pump for Six-Channel White LED Applications

Please note: this product is being discontinued and is not recommended for new designs.

The AAT3164 is a low noise, constant frequency charge pump DC/DC converter that uses a tri-mode 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.

AnalogicTech's patented single-wire Simple Serial Control™ (S²Cwire™) serial digital input is used to enable, disable, and set current for each LED with 16 levels from a maximum of 40mA down to 50µA. The maximum current level is programmed via an external resistor. To save power, the low-current mode supply current can be programmed as low as 70µA.

Each output of the AAT3164 is equipped with built-in protection for V_OUT short-circuit and auto-disable for LED short-circuit conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from V_IN and reduces quiescent current to less than 1µA.

The AAT3164 is available in a Pb-free, space-saving, ultra-thin (3x4x0.75mm), and thermally-enhanced 16-pin TDFN package.

Please note: AAT3164 is not recommended for new designs.

Data Sheets Receive a sample

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Specifications

Number of LEDs6

LED Channels6

LED(s) per/Ch1

Min. V_IN (V)2.7

Max. V_IN (V)5.5

InterfaceS²Cwire™

Typ. I_Q (μA)70

Peak Efficiency94%

Current Accuracy (%)±7%

Current Matching (%)±0.5%

Max. I_OUT per/Ch (mA)30

PackageTDFN, 16L

Package (mm)3 x 4 x 0.75

PackageTDFN34-16

Features

V_IN 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 I_{LED_MAX} to 50µA
Low I_Q (70µA) for Low Current Mode Operation
True Load Disconnect in Shutdown; I_Q < 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

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