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AAT3169

AAT
Part Number AAT3169
Manufacturer AAT
Description High Efficiency 1X/1.5X/2X Charge Pump
Published Apr 30, 2007
Detailed Description High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications General Description The AAT3169 is a low noise, consta...
Datasheet PDF File AAT3169 PDF File

AAT3169
AAT3169

Overview
High Efficiency 1X/1.
5X/2X Charge Pump for White LED Applications General Description The AAT3169 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 AAT3169 is capable of driving six LEDs for a total of 180mA 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 OUTCP) make this part 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 115µA.
For optimized efficiency, low-current settings require only 65µA of housekeeping current.
AAT3169 Features • • ChargePump™ • • • • • • • • • • • Each output of the AAT3169 is equipped with builtin protection for output short-circuit and auto-disable for load short-circuit conditions.
Built-in softwww.
DataSheet4U.
com start circuitry prevents excessive inrush current during start-up.
A low-current shutdown feature disApplications connects the load from the input and reduces quiescent current to less than 1µA.
• Color (RGB) Lighting • Programmable Current Sink The AAT3169 is available in a Pb-free, space-sav• Transmissive Displays ing, thermally-enhanced 16-pin 4x4mm QFN pack• White LED Backlighting age or a low-profile 14-pin 3x3mm STDFN pack• White Photo Flash for Digital Still Cameras age and is rated over the -40°C to +85°C temperature range.
VIN Range: 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 115µA — Low IQ (65µA) for Single-Channel, LowCurrent Mode Tri-Mode 1X, 1.
5X, and 2X Charge Pump for Maximum ...


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