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| 型号： | MAX8822ETE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 1/15页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO），PWM，切换式电容器（充电泵） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
ATION
AILABL
19-0847; Rev 0; 11/07
EVALU E
AV
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
1 μ F
+Denotes a lead-free package.
*EP = Exposed paddle.
C1P
C1N
C2P
C2N
Pin Configuration
LED1
TOP VIEW
4.7 μ F
IN
GND
MAX8822
LED2
LED3
LED4
UP TO 24mA/LED
LDO2 13
12
11
10
9
8
LED4
ENLED 14
7
NEG
SERIAL-
PULSE
CONTROL
ENLED
NEG
2.2 μ F
ENLDO 15
MAX8822
6
C1N
INTERFACE
ENLDO
REF 16
5
C2N
0.1 μ F
REF
LDO1
LDO2
V LDO1
V LDO2
+
1
2
3
4
EP
1 μ F
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.
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX882C/D | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX882C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX882CPA | 功能描述:低压差稳压器 - LDO 5/3.3/AdjV 200mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX882CPA+ | 功能描述:低压差稳压器 - LDO 5/3.3/AdjV 200mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX882CSA | 功能描述:低压差稳压器 - LDO 5/3.3/AdjV 200mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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