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参数资料
| 型号： | NCV8843MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/16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： | 340kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 150°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： | NCV8843MNR2GOSCT |
NCV8843
30
25
20
15
10
5
0
0
0.5 1.0
1.5
SWITCHING CURRENT (A)
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
BOOST pin is equal to
Figure 9. The Boost Pin Current Includes 7.0 mA
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.
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).
However, the maximum voltage on the BOOST pin should
not exceed 40 V.
SHDNB
20k
± 33%
1.2V
-
+
V IN
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
V Z = 6V to 8V
GND
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.
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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相关代理商/技术参数 |
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|---|---|
| NCV8843MNR2GEVB | 功能描述:电源管理IC开发工具 NCV8843 EVAL BRD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| NCV8843PWG | 功能描述:直流/直流开关转换器 1.5A LO VLT BUCK REG RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| NCV8843PWR2G | 功能描述:直流/直流开关转换器 16L SOW EPAD RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| NCV8851 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Automotive Grade Synchronous Buck Controller |
| NCV8851-1DBR2G | 制造商:ON Semiconductor 功能描述:SYNC BUCK CONTROLLER - Tape and Reel 制造商:ON Semiconductor 功能描述:SYNC BUCK CONTROLLER - Cut TR (SOS) 制造商:ON Semiconductor 功能描述:IC REG DL BCK/LINEAR 制造商:ON Semiconductor 功能描述:REEL / SYNC BUCK CONTROLLER |
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