MAX8822: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

The MAX8822 drives up to four white light-emitting diodes (LEDs) with regulated constant current for display backlighting in cell phones, digital cameras, PDAs, and other handheld devices. By utilizing a proprietary negative 0.5x inverting charge pump and innovative independent low-dropout (LDO) adaptive current regulators, very high efficiency is achieved over the full 1-cell Li+ battery voltage range, even with large LED VF mismatch. The 1MHz fixed-frequency switching allows for tiny external components. The regulation scheme is optimized to ensure low EMI and low input ripple. Two 200mA, low-noise, high power-supply-rejection-ratio (PSRR) LDOs with programmable output voltages are included on-chip to provide power to camera modules or other devices. The MAX8822 features a single-wire, serial-pulse control-logic interface that programs LED current and the output voltages of the LDOs. The LED dimming range is pseudo-logarithmic from 24mA to 0.1mA in 31 steps. LDO output voltages are programmable in 16 different combinations to meet various camera module requirements. The MAX8822 includes soft-start, thermal shutdown, open- and short-circuit protection.

Key Features
  • 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: Typical Operating Circuit
MAX8822: Typical Operating Circuit
  • Cell Phones and Smartphones
  • White LED Backlighting
titleDownload file
MAX8822 Data SheetMAX8822.pdf
Part NumberBattery InputRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
Dimming RatioDimming ControlPOUT
LED String Volt.
Oper. Freq.
maxmaxminmaxmaxmaxSee Notes
MAX88221-Cell Li+Charge Pump44Parallel0.024240Serial Pulse0.$1.73 @1k
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • MAX8595:High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs
  • MAX8596:High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs
  • MAX1578:Complete Bias and White LED Power Supplies for Small TFT Displays
  • MAX1576:480mA White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash
  • MAX1574:180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN
  • MAX1575:White LED 1x/1.5x Charge Pump for Main and Sub-Displays
  • MAX1573:White LED 1x/1.5x Charge Pump in UCSP and Thin QFN
  • MAX1582:High-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting
  • MAX1561:High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
  • MAX1599:High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
  • MAX1848:White LED Step-Up Converter in SOT23
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX8822ETE+ActiveTQFN,;16 pin;9.6 mm²-40°C to +85°CLead Free
MAX8822ETE+TActiveTQFN,;16 pin;9.6 mm²-40°C to +85°CLead Free
MAX8822.pdf MAX8822
MAX8822.pdf MAX8822
MAX8822.pdf MAX8822
MAX8822.pdf MAX8822
MAX8822.pdf MAX8822