AL3158:LED Drivers for Displays / Backlights

Part NumberData SheetSPICE ModelFunctionMinimumInput Voltage (V)MaximumInput Voltage (V)Maximum Output Voltage (V)Number of Regulated Output ChannelsMaximum Output Current per Channel (mA)Typical Over-Current Protection Current (mA)Switching Frequency (MHz)Efficiency (%)Quiescent Current (mA)Standby Quiescent Current (µA)SW RDS(ON) (Ω)DimmingOVPSoft StartVFB (V)OperatingTemperatureRange (°C)
AL3158AL3158.pdf-Charge Pump LED Driver2.75.55.5930-1.293210.5PWMYesYes--40 to +85
Description

The AL3158 is a low noise, constant frequency charge pump DC/DC converter that uses a Dual mode load switch (1X), and (2X) conversion for white °C applications. The AL3158 is capable of driving three groups of three °C channels at 20mA from a 2.7V to 5.5V input. The current sinks may be operated using three simple PWM dimming inputs individually or in parallel for driving higher-current °Cs. 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. AL3158 enable inputs are used to enable, disable device and dim the °C current with a fixed DC current of 20mA. Each output of the AL3158 is equipped with built-in protection for VOUT short circuit and auto-disable for °C 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 AL3158 is available in a lead-free, space-saving, thermally enhanced 20-pin 3 x 3mm QFN package.

Application
  • Mobile Phone White LED Backlighting and Indicators
  • RGB LED driving
  • PDA White LED Backlighting
  • Battery-operated Phone Main and Sub Screen White LED Backlighting
QFN3030-20
AL3158.pdf AL3158
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