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MAX8822

Maxim Integrated Products
Part Number MAX8822
Manufacturer Maxim Integrated Products
Description Ultra-Efficient Negative Charge-Pump LED Driver
Published May 4, 2009
Detailed Description 19-0847; Rev 0; 11/07 KIT ATION EVALU LE B A IL A AV Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in...
Datasheet PDF File MAX8822 PDF File

MAX8822
MAX8822

Overview
19-0847; Rev 0; 11/07 KIT ATION EVALU LE B A IL A AV Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN www.
datasheet4u.
com General Description 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 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 controllogic 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.
Applications White LED...


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