AAT3151

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 AAT3151 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 AAT3151 is capable of driving four white LEDs at a total of 120mA 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) makes the AAT3151 ideally suited for small battery-powered applications.

AnalogicTech’s AS²Cwire™ (Advanced Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with a 16-level logarithmic scale plus four low-current settings down to 50μA for optimized efficiency, with a low housekeeping current ofonly 50μA.

The charge pump output of the AAT3151 is equipped with built-in protection for V_OUT. Each current sink input has short circuit and auto-disable to guard against LED failure conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1μA.

The AAT3151 is available in a Pb-free, space-saving, thermally-enhanced, 12-pin 3x3mm TDFN package, or in the lower-profile STDFN package.

Please note: AAT3151 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)50

Peak Efficiency97%

Current Accuracy (%)±10%

Current Matching (%)±0.5%

Max. I_OUT per/Ch (mA)30

Package (mm)3 x 3

PackageSTDFN33-12,TDFN33-12

Features

V_INRange: 2.7V to 5.5V
Fully Programmable Current with Single Wire
16-Step Logarithmic Scale
15/20/30mA Max Current
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 VF Coverage
Drives Four Channels of LEDs
Individual Main/Sub-Group Control
No Inductors, Low Noise Operation
1MHz Constant Switching Frequency
Small Application Circuit
Built-In Thermal Protection
Built-In Auto-Disable for Short-Circuit
Automatic Soft Start
I_Q <1μA in Shutdown
TDFN33-12 or STDFN33-12 Package

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