MAX1576

480mA White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash


Please check latest availability status for a specific part variant.

Description

The MAX1576 charge pump drives up to 8 white LEDs with regulated constant current for uniform intensity. The main group of LEDs (LED1-LED4) can be driven up to 30mA per LED for backlighting. The flash group of LEDs (LED5-LED8) are independently controlled and can be driven up to 100mA per LED (or 400mA total). By utilizing adaptive 1x/1.5x/2x charge-pump modes and very-low-dropout current regulators, the MAX1576 achieves high efficiency over the full 1-cell lithium-battery voltage range. The 1MHz fixed-frequency switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple.

The MAX1576 uses two external resistors to set the main and flash full-scale (100%) LED currents. Four control pins are used for LED dimming by either serial control or 2-bit logic per group. ENM1 and ENM2 set the main LEDs to 10%, 30%, or 100% of full scale. ENF1 and ENF2 set the flash LEDs to 20%, 40%, or 100% of full scale. In addition, connect either pair of control pins together for single-wire, serial pulse dimming control.

The MAX1576 is available in a 24-pin thin QFN, 4mm x 4mm package (0.8mm max height).

MAX1576: Typical Application Circuit MAX1576: Typical Application Circuit Enlarge+

Key Features

  • Powers Up to 8 LEDs
    Up to 30mA/LED Drive for Backlight
    Up to 400mA Total Drive for Flash
  • 85% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge
  • 0.7% Typical LED Current Matching
  • Adaptive 1x/1.5x/2x Mode Switchover
  • Flexible Brightness Control
    Single-Wire, Serial Pulse Interface (5% to 100%)
    2-Bit (3 Levels) Logarithmic Logic
  • Low Input Ripple and EMI
  • Low 0.1µA Shutdown Current
  • 2.7V to 5.5V Supply Voltage Range
  • Soft-Start Limits Inrush Current
  • Output Overvoltage Protection
  • Thermal-Shutdown Protection
  • 24-Pin Thin QFN, 4mm x 4mm Package
  • Applications/Uses

    • Camera Phones
    • Cell Phones/Smartphones
    • LCD Backlights
    • LED Camera Flashes
    • PDAs, Digital Cameras, and Camcorders
    Part NumberBattery InputRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
    (A)
    PWM Dimming Freq.
    (kHz)
    Dimming ControlPOUT
    (W)
    VIN
    (V)
    VIN
    (V)
    ICC
    (mA)
    LED String Volt.
    (V)
    Oper. Freq.
    (kHz)
    Package/Pins
    maxmaxminmaxmaxmax
    MAX1576 1-Cell Li+Charge Pump88Parallel0.45
    Analog
    PWM
    Serial Pulse
    22.75.5651000
    TQFN/24
    See All LED Drivers (79)
    Pricing Notes:
    This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


    MAX1576EVKIT: Evaluation Kit for the MAX1576

    CAD Symbols and Footprints

  • MAX1576ETG
  • MAX1576ETG+
  • MAX1576ETG+T
  • MAX1576ETG-T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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