Datasheet > MAX8822ETE+

MAX8822ETE+

更新时间： 2024-01-25 21:01:09

品牌	Logo	应用领域
美信 - MAXIM		驱动器泵
页数	文件大小	规格书
15页	252K
描述
Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN

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MAX8822ETE+ 数据手册

19-0847; Rev 0; 11/07

Ultra-Efficient Negative Charge-Pump LED

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

MAX82

General Description

Features

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

♦ 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

1-cell Li+ battery voltage range, even with large LED V

Low 65µA (typ) Quiescent Current

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.

♦ 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

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.

♦ 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 includes soft-start, thermal shutdown,

open- and short-circuit protection.

Ordering Information

Applications

White LED Backlighting

PKG

CODE

PART

PIN-PACKAGE

TOP MARK

Cell Phones and Smartphones

16 Thin QFN-EP*

(3mm x 3mm)

MAX8822ETE+

AFW

T1633-5

Typical Operating Circuit

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

ed temperature range.

INPUT

2.7V TO 5.5V

+Denotes a lead-free package.

1μF

*EP = Exposed paddle.

C1P

C1N C2P

C2N

Pin Configuration

TOP VIEW

LED1

LED2

LED3

LED4

4.7μF

MAX8822

GND

LED4

NEG

C1N

C2N

LDO2

UP TO 24mA/LED

ENLED

NEG

SERIAL-

MAX8822

PULSE

CONTROL

INTERFACE

ENLDO 15

2.2μF

ENLDO

REF

LDO1

LDO2

0.1μF

LDO2

1μF

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.

12 3 4 5 6 7...15

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与MAX8822ETE+相关器件

型号	品牌	获取价格	描述	数据表
MAX882C/D	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators
MAX882CPA	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators
MAX882CSA	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators
MAX882CSA-T	MAXIM	获取价格	Fixed/Adjustable Positive LDO Regulator, 1.25V Min, 11V Max, 0.64V Dropout, PDSO8, 0.150 I
MAX882EPA	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators
MAX882ESA	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators
MAX882ESA+	MAXIM	获取价格	Fixed/Adjustable Positive LDO Regulator, 3.15V Min, 3.45V Max, 0.64V Dropout, PDSO8, 0.150
MAX882ESA+T	MAXIM	获取价格	Fixed/Adjustable Positive LDO Regulator, 3.15V Min, 3.45V Max, 0.64V Dropout, PDSO8, 0.150
MAX882ESA-T	MAXIM	获取价格	Fixed/Adjustable Positive LDO Regulator, 1.25V Min, 11V Max, 0.64V Dropout, PDSO8, 0.150 I
MAX882MJA	MAXIM	获取价格	5V/3.3V or Adjustable, Low-Dropout, Low IQ, 200mA Linear Regulators

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