AAT3159

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 AAT3159 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 four channels of LEDs at up to 40mA per channel from a 2.7V to 5.5V input supply voltage. The current sinks may be operated individually or in parallel for driving higher-current LEDs. A low external parts count (two 1µF flying capacitors [C1 and C2] and two small 1µF capacitors [C_IN and C_OUT]) makes this part ideally suited for small battery-powered applications.

AnalogicTech’s patented single-wire Simple Serial Control™ (S²Cwire™) serial digital interface is used to enable, disable, and set the 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, low-current mode supply current will be as low as 50µA.

Each output of the AAT3159 is equipped with built- in protection for V_OUT short-circuit operation and auto-disable functionality for LED open-circuit conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from IN and reduces quiescent current to less than 1µA.

The AAT3159 is available in a Pb-free, space-saving 2.85x3x1mm TSOPJW-14 package.

Please note: AAT3159 is not recommended for new designs.

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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

InterfaceS²Cwire™

Typ. I_Q (μA)50

Peak Efficiency93%

Current Accuracy (%)±10%

Current Matching (%)±0.5%

Max. I_OUT per/Ch (mA)40

PackageTSOPJW, 14L

Package (mm)3.05 x 2.85 x 1.02

PackageTSOPJW-14

Features

Input Supply Voltage Range: 2.7V to 5.5V
Tri-Mode (1X/1.5X/2X) Charge Pump
Maximizes Efficiency
1MHz Constant Switching Frequency
No Inductors, Low Noise Operation
Drives Four Channels of LEDs up to 40mA/Channel
User-Programmable LED Current using and external resistor
Excellent LED Channel-to-Channel Current Matching
Digitally Programmable LED Current with Single-Wire S²Cwire Interface
16 Current Levels From 40mA to 50µA
Low I_Q (50µA) 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
2.85x3x1mm TSOPJW-14 Package

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