MAX8822ETE+T【PDF 1/15 页】IC LED DRVR WHITE BCKLGT 16-TQFN

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ATION

AILABL

19-0847; Rev 0; 11/07

EVALU E

KIT

Ultra-Efficient Negative Charge-Pump LED

Driver with Dual LDOs in 3mm x 3mm Thin QFN

General Description

The MAX8822 drives up to four white light-emitting

diodes (LEDs) with regulated constant current for dis-

play 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 regu-

lators, 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 pseu-

do-logarithmic from 24mA to 0.1mA in 31 steps. LDO

output voltages are programmable in 16 different combi-

nations to meet various camera module requirements.

The MAX8822 includes soft-start, thermal shutdown,

open- and short-circuit protection.

Applications

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

Ordering Information

White LED Backlighting

Cell Phones and Smartphones

Typical Operating Circuit

PART

MAX8822ETE+

PIN-PACKAGE

16 Thin QFN-EP*

(3mm x 3mm)

TOP MARK

AFW

PKG

CODE

T1633-5

INPUT

2.7V TO 5.5V

Note: The device is specified over the -40°C to +85°C extend-

ed temperature range.

1 μ F

+Denotes a lead-free package.

*EP = Exposed paddle.

C1P

C1N

C2P

C2N

Pin Configuration

LED1

TOP VIEW

4.7 μ F

GND

MAX8822

LED2

LED3

LED4

UP TO 24mA/LED

LDO2 13

LED4

ENLED 14

NEG

SERIAL-

PULSE

CONTROL

ENLED

NEG

2.2 μ F

ENLDO 15

MAX8822

C1N

INTERFACE

ENLDO

REF 16

C2N

0.1 μ F

REF

LDO1

LDO2

V LDO1

V LDO2

1 μ F

THIN QFN

(3mm x 3mm)

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim's website at www.maxim-ic.com.

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