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参数资料
| 型号： | SC443ULTRT |
| 厂商： | Semtech |
| 文件页数： | 9/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR CONST CURRENT 16MLP |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 3 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 640kHz ~ 960kHz |
| 电源电压： | 4.5 V ~ 21 V |
| 输出电压： | 42V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-UFQFN 裸露焊盘 |
| 供应商设备封装： | 16-MLP（3x3） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | SC443ULTRTDKR |
SC443
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
T
Table 1.
Pin Name
VOUT
PGND
SW
VIN
PWM
OVPIN
SS
IOSET
COMP
IO3
IO2
IOGND
IO1
AGND
FSET
EN
Thermal Pad
Pin Function
Output voltage pin and internal pull down current source in over voltage fault. Connect the output capacitor and
the anode of the LED strings to this pin.
Power ground
Collector of the internal power transistor – connect to the boost inductor and the rectifying diode.
Input voltage supply for IC. Bypassed with capacitors close to the pin.
PWM control pin for LED backlight strings, Connect to GND to disable the IO’s.
Over-voltage input
Soft-start pin
Current source IO value set pin – by selecting the resistor connected from this pin to GND, the corresponding
maximum current on all 3 strings are set.
The output of the internal transconductance error amplifier – this pin is used for loop compensation.
Provides constant source current to LED string 3.
Provides constant source current to LED string 2.
LED ground
Provides constant current source to LED string 1.
Analog ground
External resistor setting switching frequency
Enable the device including requlator and LED drivers.
Thermal pad for heatsinking purposes — connect to ground plane using multiple vias — not connected internally.
EN
0
1
STATUS
backlight disable
backlight enable
Note: When EN = 0; the boost is turned OFF and disabled.
? 2009 Semtech Corp.
www.semtech.com
9
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