参数资料
| 型号： | NCP3125ADR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 20/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 8SOIC |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 4.5 V ~ 13.2 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 350kHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-SOICN |
| 其它名称： | NCP3125ADR2GOSDKR |
NCP3125
3.3 V
Output
Voltage
Output
Current
tss
Figure 28. Resistive Load Current
Layout Considerations
As in any high frequency switching regulator, layout is
very important. Switching current from one power device to
another can generate voltage transients across the
impedances of the interconnecting bond wires and circuit
traces. The interconnecting impedances should be
minimized by using wide short printed circuit traces. The
critical components should be located as close together as
possible using ground plane construction or single point
grounding. For optimal performance, the NCP3125 should
have a layout similar to the one shown in Figure 30. An
important note is that the input voltage to the NCP3125
should have local decoupling to PGND. The recommended
decoupling for input voltage is a 1 m F general purpose
ceramic capacitor and a 0.01 m F COG ceramic capacitor
placed in parallel.
Alternatively, if the output has an under voltage lockout,
turns on at a defined voltage level, and draws a consistent
current, then the RMS connected load current is:
PGND
Top
I CLI +
V OUT * V OUT_TO
V OUT
I OUT
(eq. 51)
BST
AGND
CP
CC
RC
798 mA +
3.3 V * 1.2 V
3.3 V
1A
VIN
ISET
VSW
COMP
FB
PGND
RF
R1
CF
I OUT
V OUT
V OUT_TO
= Output current
= Output voltage
= Output voltage load turn on
3.3 V
1.0 V
COG
0.01 uF
1 .0 uF
R2
AGND
PGND
Output
Voltage
CC
RC
CF
CP
RF
R2
R1
AGND
COMP
FB
PGND
COG
0.01 uF
BST
VIN
ISET
VSW
Output
Current
tss
t
AGND
Single Point
1 .0 uF
Bottom
Figure 29. Voltage Enable Load Current
If the inrush current is higher than the steady state input
current during max load, then an input fuse should be rated
accordingly using I 2 t methodology.
Grounding
Figure 30. Recommended Layout
The typical applications are shown in Figures 31 and 32
for output electrolytic and ceramic bulk capacitors,
respectively.
http://onsemi.com
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| NCP3125AGEVB | 功能描述:电源管理IC开发工具 NCP3125 Evaluation Board 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 |
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| NCP3126AGEVB | 功能描述:电源管理IC开发工具 NCP3126 EVB 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 |
| NCP3126CRAGEVB | 功能描述:电源管理IC开发工具 NCP3126 CERAMIC EVB 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 |
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