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The AL3159 is a low noise, constant frequency charge pump DC/DC converter that uses a Dual mode load switch (1X), and (2X) conversion for white LED applications. The AL3159 is capable of driving nine LED channels at 20mA from a 2.7V to 5.5V input. The current sinks may be operated using three simple logic control inputs individually or in parallel for driving higher-current LEDs. Low external part counts (one 1µF flying capacitor and two 2.2µF capacitors at VIN and VOUT) make this part ideally suited for small, battery-powered applications. AL3159 digital inputs are used to enable or disable the LED channels with a fixed default current settings at 20mA. Each output of the AL3159 is equipped with built-in protection for VOUT short circuit and auto-disable for LED short conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up and mode switching. A low-current shutdown feature disconnects the load from VIN to reduce quiescent current less than 1µA. The AL3159 is available in a lead-free, space-saving, thermally enhanced 20-pin 3 x 3mm QFN package.


  • Mobile Phone White LED Backlighting and Indicators
  • PDA White LED backlighting
  • Battery-operated Phone Main and Sub Screen White LED Backlighting

Product Specifications

Product Parameters

Function Charge Pump LED Driver
Minimum Input Voltage 2.7 V
Maximum Input Voltage 5.5 V
Maximum Output Voltage 5.5 V
Number of Regulated Output Channels 9
Maximum Output Current per Channel 30 mA
Typical Over-Current Protection Current N/A mA
Switching Frequency 1.2 MHz
Efficiency 93 %
Quiescent Current 2 mA
Standby Quiescent Current 1 µA
SW RDS(ON) 0.5 Ω
Dimming PWM
Soft Start Yes
Operating Temperature Range -40 to 85 °C

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