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Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFN
Pin Description
PIN
1
2
3
4
5
6
7
8–11
12
13
14
15
16
—
NAME
IN
GND
C1P
C2P
C2N
C1N
NEG
LED4–LED1
LDO1
LDO2
ENLED
ENLDO
REF
EP
FUNCTION
Supply Voltage Input. Bypass IN to GND with a 4.7μF ceramic capacitor placed as close as possible
to the IC. The input voltage range is 2.7V to 5.5V.
Ground. Connect to system ground. GND is used for charge-pump switching currents.
Transfer Capacitor 1 Positive Connection. Connect a 1μF ceramic capacitor from C1P to C1N.
Transfer Capacitor 2 Positive Connection. Connect a 1μF ceramic capacitor from C2P to C2N.
Transfer Capacitor 2 Negative Connection. Connect a 1μF ceramic capacitor from C2P to C2N.
Transfer Capacitor 1 Negative Connection. Connect a 1μF ceramic capacitor from C1P to C1N.
Charge-Pump Output. Bypass NEG to GND with a 2.2μF ceramic capacitor placed as close as
possible to the IC.
LED Current Regulators. Connect LED_ to the cathodes of the external LEDs. LED_ is high
impedance in shutdown. Connect any unused LED_ to IN to disable the corresponding current
regulator. LED_ current is programmed by pulsing ENLED as described in the LED Dimming Control
section.
LDO1 Output. Bypass LDO1 to GND with a 1μF ceramic capacitor placed as close as possible to the IC.
The LDO1 and LDO2 output voltage combination is selected by pulsing ENLDO low. See the LDO1/LDO2
Output Voltage Control section.
LDO2 Output. Bypass LDO2 to GND with a 1μF ceramic capacitor placed as close as possible to the IC.
The LDO1 and LDO2 output voltage combination is selected by pulsing ENLDO low. See the LDO1/LDO2
Output Voltage Control section.
WLED Enable and Dimming Control Input. Pulse ENLED low to program LED_ current. Hold ENLED
low for at least 2.5ms to place the LED drivers in shutdown. See the LED Dimming Control section.
LDO Enable and Voltage Control Input. Pulse ENLDO low to program the output voltage of both
LDO1 and LDO2 to one of sixteen different combinations. Hold ENLDO low for at least 2.5ms to
place the LDOs in shutdown. See the LDO1/LDO2 Output Voltage Control section.
Reference. Bypass REF to GND with a 0.1μF ceramic capacitor placed as close as possible to the IC.
V REF regulates to 1.2V (typ).
Exposed Paddle. Connect EP to GND. For good thermal dissipation, solder the exposed paddle to
the power ground plane.
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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