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

Part Models: 2
1ku List Price: Starting From $2.27

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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

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 V_F 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.

Applications

Cell Phones and Smartphones
White LED Backlighting

Part Models: 2
1ku List Price: Starting From $2.27

Documentation

Data Sheet 1

MAX8822: Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN Data Sheet (Rev.0) 12/06/2007

Reliability Data 1

MAX8822 Reliability Data 01/12/2023

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX8822ETE+	LFCSP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX8822ETE+T	LFCSP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 27, 2024 - 2400 ASSEMBLY
		pcn_2400
MAX8822ETE+	PRODUCTION
MAX8822ETE+T	PRODUCTION
Mar 9, 2023 - 2276A WAFER FAB
		pcn_2276a
MAX8822ETE+	PRODUCTION
MAX8822ETE+T	PRODUCTION
Dec 13, 2013 - 1355 MECHANICAL DATASHEET
		pcn_1355
MAX8822ETE+	PRODUCTION
MAX8822ETE+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

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 T_A Derating Option for 2 to 9 White LEDs
MAX8596	Obsolete	High-Efficiency, 36V Step-Up Converters with T_A 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

Evaluation Kits

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.