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Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFN
ENLED
1
2
3
4
1
2
3
13
14
t INIT = 120 μ s
t HI = 500ns TO 500 μ s
t LO = 500ns TO 500 μ s
t INIT
t HOLD
2.5ms
t HI
t LO
t HOLD
2.5ms
t SHDN
2.5ms
INTERNAL
CURRENT SHDN
24.0mA
22.4mA
20.8mA
19.2mA
24.0mA
22.4mA
20.8mA
5.6mA
4.8mA
SHDN
SETTING
19.2mA
I LED_
SHDN
4.8mA
SHDN
Figure 1. Timing Characteristics for LED Serial-Pulse Control Interface
ENLDO
0
1
2
3
1
2
3
12
13
t INIT = 120 μ s
t HI = 500ns TO 500 μ s
t LO = 500ns TO 500 μ s
t INIT
tHOLD
2.5ms
t HI
t LO
t HOLD
2.5ms
t SHDN
2.5ms
INTERNAL
LDO1
SHDN 0V
2.8V
3.3V
2.8V
2.8V
3.3V
2.8V
0V
1.8V
SHDN
SETTING
INTERNAL
LDO2
SHDN 0V
1.2V
1.2V
1.5V
1.2V
1.2V
1.5V
2.8V
0V
SETTING
2.8V
1.8V
V LDO1
SHDN
1.5V
SHDN
V LDO2
SHDN
0V
SHDN
Figure 2. Timing Characteristics for LDO Serial-Pulse Control Interface
Detailed Description
The MAX8822 drives up to four white LEDs (WLEDs) with
regulated constant current for display backlighting in cell
phones, cameras, PDAs, and other handheld devices.
The IC also includes two low-noise, high-PSRR, 200mA
LDOs for powering camera modules or other devices.
Figure 3 depicts the MAX8822 block diagram.
The MAX8822 IC utilizes a 0.5x inverting charge pump
and extremely low-dropout current regulators to
achieve high efficiency over the full 1-cell Li+ battery
voltage range. The charge pump remains inactive
unless the LED current regulators require additional
voltage to prevent them from entering dropout. To max-
imize efficiency, the current regulators operate with as
little as 150mV voltage drop. Additionally, each LED
current regulator is independently monitored and
switched, ensuring the least possible power consump-
tion to extend battery life (see the Adaptive Current
Regulator Switchover section for details).
8
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相关代理商/技术参数
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
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
MAX882CSA+T 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-T 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