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参数资料
| 型号： | SC185QULTRT |
| 厂商： | Semtech |
| 文件页数： | 5/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3.3V 4A 16MLPQ |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 2.9 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-UFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-MLPQ-UT（3x3） |
| 其它名称： | SC185QULDKR |
SC185
Pin Descriptions
Pin #
1,2
3
4
5
6
7
8
9
10
11,12,13
14,15,16
T
Pin Name
PVIN
AGND
AVIN
MODE
EN
PGOOD
NC
SS
VOUT
PGND
LX
Thermal Pad
Pin Function
Input supply voltage for the converter power stage.
Ground connection for the internal circuitry. AGND needs to be connected to PGND directly.
Power supply for the internal circuitry. AVIN is required to be connected to PVIN through an R-C filter of 1Ω
and 100nF.
MODE select pin. When connected to logic high, the device operates in forced PWM mode. When connected
to logic low, it operates normally with PSAVE mode at light load. The enable pin has a 500kΩ internal pull-
down resistor. This resistor is switched in circuit whenever the MODE pin is “Low” or when the part is in un-
dervoltage lockout.
Enable pin. When connected to logic high or tied to AVIN pin, the SC185 is on. When connected to logic low,
the device enters shutdown and consumes less than 1μA current (typ.). The enable pin has a 500kΩ internal
pulldown resistor. This resistor is switched in circuit whenever the EN is “Low” or when the part is in undervolt-
age lockout.
Power good indicator. When the output voltage reaches the PGOOD threshold, this pin will be open-drain
(After the PGOOD delay), otherwise, it is pulled low internally.
No connection.
Soft Start. Connect a soft-start capacitor to program the soft start time. There is a 5μA charging current flow-
ing out of the pin.
Output voltage sense pin.
Ground connection for converter power stage.
Switching node - connect an inductor between this pin and the output capacitor.
Thermal pad for heatsinking purposes. Recommend to connect it to PGND. It is not connected internally.
? 2010 Semtech Corp.
5
www.semtech.com
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