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参数资料
| 型号： | NCP1546MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 3/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 1.5A 18DFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出数： | 1 |
| 输入电压： | 4.5 V ~ 40 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 170kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 18-VFDFN 裸露焊盘 |
| 包装： | 剪切带 (CT) |
| 供应商设备封装： | 18-DFN（5x6） |
| 其它名称： | NCP1546MNR2GOSCT |
NCP1546
PACKAGE PIN DESCRIPTION
PIN SYM-
SO ? 8
1
2
3
4
5
6
7
8
?
?
DFN ? 18
1
2 ? 4
5 ? 7
8
10
13
16
17
9, 11, 12,
14, 15, 18
?
BOL
BOOST
V IN
V SW
SHDNB
SYNC
GND
V FB
V C
NC
?
FUNCTION
The BOOST pin provides additional drive voltage to the on ? chip NPN power transistor. The
resulting decrease in switch on voltage increases efficiency.
This pin is the main power input to the IC.
This is the connection to the emitter of the on ? chip NPN power transistor and serves as the
switch output to the inductor. This pin may be subjected to negative voltages during switch off ?
time. A catch diode is required to clamp the pin voltage in normal operation. This node can
stand ? 1.0 V for less than 50 ns during switch node flyback.
The shutdown pin is active low and TTL compatible. The IC goes into sleep mode, drawing less
than 1.0 m A when the pin voltage is pulled below 1.0 V.
This pin should be pulled up to V CC with a resistor.
This pin provides the synchronization input.
Power return connection for the IC.
The FB pin provides input to the inverting input of the error amplifier. If V FB is lower than 0.29 V,
the oscillator frequency is divided by four, and current limit folds back to about 1 ampere. These
features protect the IC under severe overcurrent or short circuit conditions.
The V C pin provides a connection point to the output of the error amplifier and input to the PWM
comparator. Driving of this pin should be avoided because on ? chip test circuitry becomes active
whenever current exceeding 0.5 mA is forced into the IC.
No Connection
Exposed die attach pad. Internally connected to GND. External connection to GND is optional.
PIN CONNECTIONS
BOOST
V IN
V SW
SHDNB
1
SO ? 8
8
V C
V FB
GND
SYNC
BOOST
V IN
V IN
V IN
Vsw
V SW
V SW
SHDNB
NC
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
NC
V C
V FB
NC
NC
GND
NC
NC
SYNC
18 ? Lead DFN
http://onsemi.com
3
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