MAX8631X

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

Data Sheet (Rev. 3)
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Overview

  • 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

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).

Applications

  • Backlighting and Flash
  • Camera Phones and Smartphones
  • PDAs, Digital Cameras, and Camcorders
MAX8631X
1x/1.5x/2x White LED Charge Pump with Two LDOs in 4mm x 4mm Thin QFN
MAX8631X, MAX8631Y: Typical Operating Circuit
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Documentation

Data Sheet 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LED Drivers 9
MAX1576
PRODUCTION 480mA White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash
MAX1582
High-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting
MAX1575
White LED 1x/1.5x Charge Pump for Main and Sub-Displays
MAX1561
PRODUCTION High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
MAX1599
PRODUCTION High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
MAX8595
LAST TIME BUY High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs
MAX8596
Obsolete High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs
MAX1573
PRODUCTION White LED 1x/1.5x Charge Pump in UCSP and Thin QFN
MAX1574
PRODUCTION 180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN
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