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AL3158 (NRND)

NRND = Not Recommended for New Design

HIGH-EFFICIENCY 1x/2x CHARGE PUMP FOR WHITE LED APPLICATIONS

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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 LED applications. The AL3158 is capable of driving three groups of three LED 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 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. AL3158 enable inputs are used to enable, disable device and dim the LED 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 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 AL3158 is available in a lead-free, space-saving, thermally enhanced 20-pin 3 x 3mm QFN package.

Feature(s)

  • VIN Range: 2.7V to 5.5V
  • Up to 93% Max Power Efficiency
  • 1% Current Matching Accuracy Between Channels
  • Drives up to 9 Channels of LEDs in 3 x 3-Channels combinations
  • Versatile 3-wire logic decoding of °C current control
  • Short circuit, Thermal and UVLO Protection

Application(s)

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

Product Specifications

Product Parameters

AEC Qualified No
AEC-Q100 Grade No
Compliance (Only Automotive supports PPAP) Standard
Dimming PWM
Dimming (Analog) No
Dimming (PWM) No
Efficiency (%) 93
Efficiency (%) 93
Function Charge Pump LED Driver
LED Current (A) 0.03
MaximumInput Voltage (V) 5.5
Maximum Input Voltage (V) 5.5
Maximum LED Current (A) 0.03
Maximum Output Current per Channel 30
Maximum Output Voltage (V) 5.5
Maximum Output Voltage (V) 5.5
MinimumInput Voltage (V) 2.7
Minimum Input Voltage (V) 2.7
Number of Regulated Output Channels 9
OperatingTemperatureRange  (°C) -40 to 85
Operating Temperature Range (°C) -40 to 85
OVP Yes
AEC Qualified No
Quiescent Current (µA) 2
Quiescent Current Typ (mA) 2
Quiescent Current Typ (mA) 2
Soft Start Yes
Standby Quiescent Current (µA) 1
SW RDS(ON) 0.5
Switching Frequency (MHz) 1.2
Switching Frequency Maximum (kHz) 1.2
Topologies (Boost) No
Topologies (Buck-Boost) No
Topologies (Buck) No
Topologies (Charge Pump) Yes
Topology Charge Pump
Typical Overcurrent Protection Current N/A
VFB N/A

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