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180mA, 1x/2x, White LED Charge Pump
in 3mm x 3mm TDFN
Typical Operating Characteristics (continued)
(Circuit of Figure 2, V IN = 3.6V, EN = IN, driving three white LEDs, T A = +25°C, unless otherwise noted.)
DIMMING RESPONSE
MAX1574 toc10
V IN
LINE TRANSIENT 3.8V TO 3.3V TO 3.8V
MAX1574 toc11
1V/div
V EN
2V/div
V OUT
1V/div
I OUT
50mA/div
V OUT
2V/div
I OUT
60mA,
20mA/div
10ms/div
100 μ s/div
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
—
NAME
IN
EN
CP
CN
SET
LED3
LED2
LED1
GND
OUT
EP
FUNCTION
Supply Voltage Input. Connect a 0.47μF to 1μF ceramic capacitor from IN to GND. The input voltage
range is 2.7V to 5.5V. IN is high impedance during shutdown.
Enable and Dimming Control. Pulsing EN low dims the LEDs in multiple steps. Drive low for longer than
2ms (typ) to shut down the IC. From shutdown, drive EN high (50μs min) to set I LED to the maximum
current (see the SETfunction). Pulse EN low for 0.5μs to 500μs to dim the LEDs (Figure 1).
Transfer-Capacitor Positive Connection. Connect a 0.22μF capacitor from CP to CN.
Transfer-Capacitor Negative Connection. Connect a 0.22μF capacitor from CP to CN.
Current-Set Input. Connect a resistor (R SET ) from SET to GND to set the maximum LED current.
I LED(MAX) = 393 × 0.6V / R SET . SET is internally biased to 0.6V. SET is high impedance during shutdown.
LED_ Cathode Connection. Current flowing into LED_ is based on SET description above. In 2x mode,
the charge pump regulates the lowest LED_ voltage to 0.18V. Connect LED_ to IN for unpopulated LEDs.
LED_ is high impedance during shutdown.
Ground. Connect GND to system ground and as close as possible to the input-bypass capacitor ground.
Output. Connect a 0.47μF to 1μF ceramic capacitor from OUT to GND, and connect OUT to the anodes
of all the LEDs. OUT is pulled to ground through an internal 5k ? resistor in shutdown.
Exposed Paddle. Connect the exposed paddle directly to GND underneath the IC.
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MAX1575ETE/V+ 功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump for Main and Sub-Displays 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
MAX1575ETE/V+T 功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump for Main and Sub-Displays 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
MAX1575ETE+ 功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump 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
MAX1575ETE+T 功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump 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
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