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1x/1.5x/2x White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Powers Up to 8 LEDs
    • Up to 30mA/LED Drive for Backlight
    • Up to 400mA Total Drive for Flash
  • Two Internal Low-Noise 200mA LDOs
  • 94% Max/85% Avg Efficiency (PLED/PBATT) over Li+ Battery Discharge
  • 0.2% Typical LED Current Matching
  • Adaptive 1x/1.5x/2x Mode Switchover
    • Single-Wire Serial Pulse Interface for Brightness Control (32 Steps)
    • 2-Bit Logic (Three Levels)
  • Thermal TA Derating Function
  • Low Input Ripple and EMI
  • 2.7V to 5.5V Supply Voltage Range
  • Soft-Start, Overvoltage, and Thermal-Shutdown Protection
  • 28-Pin Thin QFN, 4mm x 4mm Package

Applications/Uses

  • Backlighting and Flash
  • Camera Phones and Smartphones
  • PDAs, Digital Cameras, and Camcorders

Description

The MAX8631X/Y charge pump drives up to eight white LEDs with regulated constant current for uniform intensity. The main group of LEDs (M1–M4) can be driven up to 30mA per LED for backlighting. The flash group of LEDs (F1–F4) is independently controlled and can be driven up to 100mA per LED (or 400mA total). Two 200mA LDOs are on-board to provide power for camera functions. The LDOs, output voltages are pin-programmable to meet different camera-module requirements. By utilizing adaptive 1x/1.5x/2x charge-pump modes and very-low-dropout current regulators, the MAX8631X/Y 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 MAX8631X/Y is available in a 28-pin thin QFN, 4mm x 4mm lead-free package (0.8mm max height).

Simplified Block Diagram

MAX8631X, MAX8631Y: Typical Operating Circuit MAX8631X, MAX8631Y: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .