MAX8822

PRODUCTION

Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN

Independent Adaptive Voltage Supply for Four WLEDs with Two 200mA Low-Noise/High PSRR LDOs for Display Backlighting

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • High-Efficiency Charge Pump for Up to Four White LEDs
    • Independent Adaptive Voltage Supply for Each LED
    • 24mA to 0.1mA Dimming Range
    • 1% (typ) Current Accuracy and 0.3% Current Matching
    • Low 65µA (typ) Quiescent Current
  • Dual 200mA Low-Noise, High PSRR LDOs
    • 16 Different Output Voltage Combinations Up to 3.3V
    • High 60dB PSRR at 10kHz
  • Flexible Single-Wire Control for Dimming and LDO Output Voltage
  • Low 0.5µA (typ) Shutdown Mode
  • Soft-Start Limits Inrush Current
  • Thermal Shutdown and Open- and Short-Circuit Protection
  • Tiny 16-Pin, 3mm x 3mm Thin QFN Package (0.8mm max Height) with Exposed Paddle
MAX8822
Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN
MAX8822: 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 11
MAX1575
Obsolete White LED 1x/1.5x Charge Pump for Main and Sub-Displays
MAX1848
PRODUCTION White LED Step-Up Converter in SOT23
MAX1582
Obsolete High-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting
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
MAX1599
PRODUCTION High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
MAX1561
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
MAX1576
PRODUCTION 480mA White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash
MAX1578
Obsolete Complete Bias and White LED Power Supplies for Small TFT Displays
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Evaluation Kits

MAX8822EVKIT

Evaluation Kit for the MAX8822

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Features and Benefits

  • Powers Up to 4 White LEDs
    • Independent Adaptive Voltage Supply for Each LED
    • 24mA to 0.1mA Dimming Range
    • 1% (typ) Current Accuracy and 0.3% (typ) Current Matching
  • Dual 200mA Low-Noise, High PSRR LDOs
    • 16 Selectable LDO Output Voltage Combinations from OFF Up to 3.3V
  • MAXQ2000 Microprocessor Circuit for LED and LDO Serial-Pulse Control
    • Sequential UP/DOWN LED Dimming Pushbutton Control
    • DIP-Selectable LDO Output Voltages
  • 2.7V to 5.5V Input Range
  • Selectable Microprocessor Circuit Power Input (IN1, IN2)
  • WLED and LDO Short-Circuit and Thermal Protection
  • Small, Low-Profile Components
  • Lead-Free and RoHS-Compliant
  • Fully Assembled and Tested

Product Details

The MAX8822 evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) that demonstrates the MAX8822 ultra-efficient negative charge-pump LED driver with dual LDOs. The MAX8822 drives up to four white LEDs (WLEDs) for backlighting and contains two 200mA, low-noise, high power-supply-rejection-ratio (PSRR) LDOs to power external camera modules or other loads. The EV kit includes a MAXQ2000 microcontroller circuit that provides the serial-pulse control necessary to adjust WLED brightness and LDO output voltages. Through the MAXQ2000, WLED brightness levels are sequentially incremented/decremented between 0.1mA and 24mA and shut down by pushbutton controls. Sixteen different LDO output-voltage combinations (from off to 3.3V) are selected by DIP-switch positions and latched by a pushbutton. The MAX8822 IC includes soft-start, WLED and LDO short-circuit protection, and thermal shutdown.

Applications

  • Cell Phones and Smartphones
  • White LED Backlighting
MAX8822EVKIT
Evaluation Kit for the MAX8822

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