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参数资料
| 型号： | MAX1574 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | 180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN |
| 中文描述： | 180mA、1倍/2倍、白光LED电荷泵，3mm x 3mm TDFN封装 |
| 文件页数： | 5/9页 |
| 文件大小： | 214K |
| 代理商： | MAX1574 |
M
180mA, 1x/2x, White LED Charge Pump
in 3mm x 3mm TDFN
_______________________________________________________________________________________
5
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
I
OUT
V
EN
V
OUT
50mA/div
2V/div
2V/div
10ms/div
LINE TRANSIENT 3.8V TO 3.3V TO 3.8V
MAX1574 toc11
V
OUT
V
IN
I
OUT
1V/div
1V/div
60mA,
20mA/div
100
μ
s/div
Pin Description
PIN
NAME
FUNCTION
1
IN
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.
2
EN
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).
3
4
CP
CN
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.
5
SET
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.
6
7
8
9
LED3
LED2
LED1
GND
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.
10
OUT
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.
—
EP
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1574EEE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1574ETB | 制造商:Maxim Integrated Products 功能描述:180MA, 1X/2X, WHITE LED CHARGE PUMP IN 3MM X - Rail/Tube |
| MAX1574ETB+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX1574ETB+T | 功能描述:LED照明驱动器 White LED 1x/2x 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 |
| MAX1574ETB-T | 功能描述:LED照明驱动器 White LED 1x/2x 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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