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| 型号： | NCP1546MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/15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
30
25
20
15
10
5
0
0
0.5 1.0
1.5
SWITCHING CURRENT (A)
Figure 9. The Boost Pin Current Includes 7.0 mA
Figure 8. The Regulator in Current Limit
BOOST Pin
The BOOST pin provides base driving current for the
power switch. A voltage higher than V IN provides required
headroom to turn on the power switch. This in turn reduces
IC power dissipation and improves overall system
efficiency. The BOOST pin can be connected to an external
boost ? strapping circuit which typically uses a 0.1 m F
capacitor and a 1N914 or 1N4148 diode, as shown in Figure
1. When the power switch is turned on, the voltage on the
Pre ? Driver Current and Base Current when the
Switch is Turned On. The Beta Decline of the
Power Switch Further Increases the Base
Current at High Switching Current
Shutdown
The internal power switch will not turn on until the V IN
pin rises above the Startup Voltage. This ensures no
switching will occur until adequate supply voltage is
provided to the IC. Refer to Figure 10 for the SHDNB
(shutdown ? bar) pin input circuit.
BOOST pin is equal to
VBOOST + VIN ) VO * VF
where:
V F = diode forward voltage.
The anode of the diode can be connected to any DC
voltage as well as the regulated output voltage (Figure 1).
SHDNB
20k
± 33%
-
V IN
However, the maximum voltage on the BOOST pin shall not
1.2V
+
exceed 40 V.
As shown in Figure 9, the BOOST pin current includes a
constant 7.0 mA pre ? driver current and base current
proportional to switch conducting current. A detailed
discussion of this current is conducted in Thermal
Consideration section. A 0.1 m F capacitor is usually adequate
for maintaining the Boost pin voltage during the on time.
V Z = 6V to 8V
GND
Figure 10.
The IC enters a sleep mode when the SHDNB pin is pulled
below the Shutdown Threshold Voltage. In sleep mode, the
power switch is kept open and the supply current reduces to
Shutdown Quiescent Current ( 1 m A typically). This pin has
an internal pull ? down current. When not in use, pull this pin
up to V CC with a resistor (See Figure 1). A 100 k W pullup
resistor will ensure safe operation from below 9 V and
during a 40 V load dump condition.
http://onsemi.com
8
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