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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


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 256kB)
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Description
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.

An evaluation kit is available:  MAX8822EVKIT  

Key Features   Applications/Uses
  • 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
 

Diagram
MAX8822: Typical Operating Circuit
Typical Operating Circuit

Evaluation Kits
  • MAX8822EVKIT
  • Design Guides
  • Communications (PDF)
  • Automotive (PDF)
  • Medical (PDF)
  • Reliability Reports
  • Reliability Report: MAX8822.pdf
  • Show FIT data for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-2 of 2

    MAX8822 Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8822ETE+  
    Active TQFN;16 pin;9.6 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0032 (PDF)
    Use pkgcode/variation: T1633+5*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8822ETE+T    
    Active TQFN;16 pin;9.6 mm²
    Outline Drawing: 21-0136 (PDF)
    Land Pattern: 90-0032 (PDF)
    Use pkgcode/variation: T1633+5*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • Topmark Coding: MAX8822
  • New Product Press Release 2008-04-17 

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    MAX1574 180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN
    MAX1576 480mA White LED 1x/1.5x/2x Charge Pump for Backlighting and Camera Flash
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    Document Ref.: 19-0847; Rev 0; 2007-12-06
    This page last modified: 2009-09-01


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