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8-Port, 5.5V Constant-Current LED Driver with
LED Fault Detection
Pin Description
PIN
1
2
3
4
5 – 12
13
14
15
16
PAD
NAME
GND
DIN
CLK
LE
OUT0 – OUT7
OE
DOUT
SET
V+
Exposed pad*
FUNCTION
Ground
Serial-Data Input. Data is loaded into the internal 8-bit shift register on CLK ’ s rising edge.
Serial-Clock Input. Data is loaded into the internal 8-bit shift register on CLK ’ s rising edge.
Load-Enable Input. Data is loaded transparently from the internal shift register to the output latch while
LE is high. Data is latched into the output latch on LE's falling edge, and retained while LE is low.
LED Driver Outputs. OUT0 – OUT7 are open-drain, constant-current sinking outputs rated to 5.5V.
Output Enable Input. High forces outputs OUT0 – OUT7 to high impedance, without altering the contents
of the output latches. Low enables outputs OUT0 – OUT7 to follow the state of the output latches.
Serial-Data Output. Data is clocked out of the 8-bit internal shift register to DOUT on CLK ’ s rising edge.
LED Current Setting. Connect SET to GND through a resistor (R SET ) to set the maximum LED current.
Positive Supply Voltage. Bypass V+ to GND with a 0.1μF ceramic capacitor.
Exposed pad on package underside. Connect to GND.
* TSSOP package only.
CLK
MAX6977
DIN
D0
SERIAL-TO-PARALLEL SHIFT REGISTER
D7
DOUT
LE
D0
LATCHES
D7
POWER-ON
RESET
V+
OE
V+
D0
CONSTANT-CURRENT SINKS
FAULT DETECTION
D7
CURRENT
REFERENCE
R SET
GND
OUT0
OUT1
OUT2
OUT5
OUT6
OUT7
GND
Figure 1. MAX6977 Block Diagram
Detailed Description
The MAX6977 LED driver comprises a 4-wire serial
interface driving eight constant-current sinking open-
drain output ports. The outputs drive LEDs in either sta-
tic or multiplex applications (Figure 1). The constant-
current outputs are guaranteed for current accuracy
not only with chip-supply voltage variations (5V ±10%
and 3V to 5.5V), but also over a realistic range of driver
output voltage drop (0.5V to 2.5V). The drivers use cur-
rent-sensing feedback circuitry (not simple current mir-
rors) to ensure very small current variations over the full
allowed range of output voltage (see Typical Operating
Characteristics ).
6
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相关代理商/技术参数
MAX6977AAE+T 功能描述:LED照明驱动器 8-Port 5.5V Constant Current LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX6977AAE-T 功能描述:LED显示驱动器 RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube
MAX6977AEE 制造商:Maxim Integrated Products 功能描述:8-PORT, 5.5V CONSTANT-CURRENT LED DRIVER WITH - Rail/Tube
MAX6977APE 功能描述:LED照明驱动器 8-Port 5.5V Constant Current LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX6977APE+ 功能描述:LED照明驱动器 8-Port 5.5V Constant Current LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX6977AUE 功能描述:LED照明驱动器 8-Port 5.5V Constant Current LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX6977AUE+ 功能描述:LED照明驱动器 8-Port 5.5V Constant Current LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX6977AUE+T 功能描述:LED照明驱动器 8-Port 5.5V Constant Current LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N