AAT3157

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

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

The AAT3157 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 AAT3157 is capable of driving up to three channels of LEDs at 20mA 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 V_IN and V_OUT) make this part ideally suited for small battery-powered applications.

AnalogicTech's S²Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with 16 settings down to 50µA. The low-current mode supply current can be as low as 50µA to save power. Each output of the AAT3157 is equipped with built-in protection for V_OUT short-circuit and auto-disable for load 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 AAT3157 is available in a Pb-free, space-saving, 2.85x3.0mm 12-pin TSOPJW package.

Please note: AAT3157 is not recommended for new designs.

Data Sheets Receive a sample

Talk to Sales ECAD Model

Specifications

Number of LEDs3

LED Channels3

LED(s) per/Ch1

Min. V_IN (V)2.7

Max. V_IN (V)5.5

InterfaceS²Cwire™

Typ. I_Q (μA)50

Peak Efficiency97%

Current Accuracy (%)±10%

Current Matching (%)±0.5%

Max. I_OUT per/Ch (mA)20

PackageTSOPJW, 12L

Package (mm)3 x 2.85 x 1.02

PackageTSOPJW-12

Features

V_IN Range: 2.7V to 5.5V
Fully Programmable Current with Single Wire
16 Current Levels
Four Low Current Settings Down to 50µA
Low I_Q (50µA) for Low Current Mode
Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and V_F Coverage
Drives up to Three Channels of LEDs
No Inductors, Low Noise Operation
1MHz Constant Switching Frequency
Small Application Circuit
Built-In Thermal Protection
Automatic Soft Start
I_Q < 1µA in Shutdown
2.85x3.0mm TSOPJW-12 Package

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