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MAX8631X, MAX8631Y

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

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Status Explanations for product status codes

Part Number Status
MAX8631 Active: In Production.
MAX8631X Active: In Production. See Ordering Information for details.
MAX8631Y Active: In Production.


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).

Data Sheet

Download this datasheet in PDF formatDownload Rev 3 (PDF, 268kB)
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An evaluation board is available: MAX8631XEVKIT

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


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

Key Specifications:

LED Drivers
Part Number Battery Input Regulation Topology Max. No. of LEDs LED Channels LED Configuration ILED per Channel
Dimming Ratio Dimming Control POUT
LED String Volt.
Oper. Freq.
max max min max max max
MAX8631  1-Cell Li+ Charge Pump 8 8 Parallel 0.1 32 Serial Pulse 2.25 2.7 5.5 6 5 1000
See All LED Drivers (80)

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.


MAX8631X, MAX8631Y: Typical Operating Circuit
Typical Operating Circuit

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Information Index

Document Ref.: 19-3688 Rev 3; 2008-07-01
This page last modified: 2008-07-01