AAT3141

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

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

The AAT3141 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 produces current levels up to 30mA on each of its four current source outputs to drive various arrangements of LEDs from a 2.7V to 5.5V input. Outputs 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 CP) make the AAT3141 ideally suited for small battery-powered applications.

AnalogicTech’s Advanced Simple Serial Control™ (AS²Cwire™) digital input is used to enable, disable, and set the LED drive current with a 32-level logarithmic scale LED brightness control. The AAT3141 has a thermal management system to protect the device in the event of a short circuit condition at an output pin. Built-in soft-start circuitry prevents excessive inrush current during start-up. A high charge pump switching frequency enables the use of very small external capacitors. In shutdown mode, the device disconnects the load from V_IN and reduces quiescent current to less than 1µA.

The AAT3141 is available in the very small 12-pin TSOPJW package.

Please note: AAT3141 is not recommended for new designs.

Data Sheets Receive a sample

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Specifications

Number of LEDs4

LED Channels4

LED(s) per/Ch1

Min. V_IN (V)2.7

Max. V_IN (V)5.5

InterfaceAS²Cwire™

Typ. I_Q (μA)550

Peak Efficiency93%

Current Accuracy (%)±10%

Current Matching (%)±0.5%

Max. I_OUT per/Ch (mA)30

PackageTSOPJW, 12L

Package (mm)3 x 2.85 x 1.02

PackageTSOPJW-12

Features

V_IN Range: 2.7V to 5.5V
Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and V_F Coverage
Drives Low-V_F and High-V_F Type LEDs
Up to Four 30mA Outputs
AS²Cwire Independent 3+1 Output Addressing
32-Position Logarithmic Scale with Digital Control
Low Noise Constant Frequency Operation
1MHz Switching Frequency
AutoBias Technology
Small Application Circuit
Regulated Output Current
Automatic Soft Start
No Inductors
I_Q < 1μA in Shutdown
12-Pin TSOPJW Package

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