参数资料
| 型号： | BD3951F-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .15A 8SOP |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 6 V ~ 20 V |
| 电压 - 压降（标准）： | 0.31V @ 100mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-SOP |
| 包装： | 带卷 (TR) |
BD3951F
● Block Diagram, Application Circuit, Pin Description
Technical Note
Vcc
1
0.33 μ F
R2:36k ?
PreReg
Vref
OUT
OUT SOUT RES GND
R1:10k ?
8
3.3 μ F
RADJ
3
VCC
20k ?
6
RES
Vcc
SIN RADJ CT
4
CT
0.1 μ F
SIN
2
VCC
20k ?
7
SOUT
PIN
Vcc
External
Component
Capacitor :Cin
Value
0.33 μ F ～
10mF
GND
5
Fig.13
OUT
CT
SIN
RADJ
Capacitor :Co
Capacitor :Cct
Resistor :R1,R2
Resistor :R3,R4
Fig.14
3.3 μ F ～
2200 μ F
0.01 μ F ～ 10 μ F
0 ? ～ 100k ?
0 ? ～ 100k ?
?
?
ESR range of the output capacitor Co is 0 (ceramic capacitor) to 100 ? .
VCC must be more than 5V under the condition SIN is used for VCC voltage drop detection.
Ex.
Vcc=5.8V detection, Since 1.26V ＊ (R1+R2)/R1=5.8V,
R1=10k ? ,R2=36k ?
?
Reset detection voltage must be more than 4V under the condition RADJ is used for OUT voltage drop detection.
Ex.
OUT=4.5V detection, Since 1.26V ＊ (R3+R4)/R3=4.5V,
R3=10k ? ,R4=26k ?
OUT
(8PIN)
R 4 =26k ?
3.3 μ F
R 3 =10k ?
RADJ
(3PIN)
RESET function can be discarded while RADJ terminal pulls up to OUT terminal, which in case RES terminal output “H”.
Battery detection function can be discarded while SIN terminal pulls up to OUT terminal, which in case SOUT terminal output
“H”. 0 ～ 47K ? pull up resistors are recommended in both condition.
right pull up resistor value.
● Terminal Description
Set application board test is necessary to select the
Pin. No Pin Name
1 Vcc
Battery power supply
Function
2
3
4
5
6
7
8
SIN
RADJ
CT
GND
RES
SOUT
OUT
Battery voltage detection input terminal. Must be connected to OUT terminal while this
function is not employed.
RESET voltage adjustment terminal. Connect to GND in case internal detect voltage is
employed
RESET delay time control terminal
IC GND terminal
RESET output terminal. Built in 20K ? pull up.
Battery voltage detection output terminal. Built in 20K ? pull up.
5.0V output terminal
www.rohm.com
? 2009 ROHM Co., Ltd. All rights reserved.
4/9
2009.07 - Rev.A
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