参数资料
| 型号： | SC419ULTRT |
| 厂商： | Semtech |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 20-MLPQ |
| 标准包装： | 1 |
| 系列： | EcoSpeed®, SmartDrive™ |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 3 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-MLPQ |
| 包装： | 标准包装 |
| 其它名称： | SC419ULTRTDKR |
SC419
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
PAD
Pin Name
FB
NC
VDDA
VOUT
NC
VIN
NC
BST
DH
LX
PGND
DL
VDDP
PSV
PGOOD
ILIM
EN
AGND
TON
AGND
AGND
Pin Function
Feedback input for switching regulator — connect to an external resistor divider from output — used to
program the output voltage.
No Connection
Supply input for internal analog circuits — connect to 5V supply — and the sense input for VDDA UVLO.
Bypass with a 100nF minimum capacitor to AGND.
Output voltage sense pin
No Connection
Input supply voltage — connect to the same supply as the high-side MOSFET. Connect a 100nF capacitor to
AGND.
No Connection
Bootstrap pin — connect a 100nF minimum capacitor from BST to LX to develop the floating voltage for the
high-side gate drive.
High-side gate drive output
Switching (phase) node
Power ground
Low-side gate drive output
Supply input for the DH and DL gate drives — connect to the same 5V supply used for VDDA. Bypass with a
1μF minimum capacitor to PGND.
Power-save programming input — connect a resistor to AGND to set the minimum power-save frequency.
Float pin to select power-save at no minimum frequency or pull up to VDDA to disable power-save.
Open-drain Power Good indicator — high impedance indicates the switching regulator output power is
good. An external pull-up resistor is required.
Current limit sense pin — used to program the current limit by connecting a resistor from ILIM to LX.
Enable input for switching regulator — logic low disables the switching regulator or logic high enables the
switching regulator.
Analog ground
ON time programming input — set the on-time by connecting through a resistor to AGND.
Connect this pin to AGND along with pins 18 and PAD.
Analog ground
9
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