BD9870FPS_09 ROHM [Rohm], BD9870FPS_09 Datasheet - Page 6

• Manufacturer Part Number: BD9870FPS_09
• Description: Simple Step-down Switching Regulator with Built-in Power MOSFET
• Manufacturer: ROHM [Rohm]

●Test Circuit
BD9870FPS
© 2009 ROHM Co., Ltd. All rights reserved.
www.rohm.com
＜Recommended Components (Example)＞
＜Recommended Components example 2＞…when the Duty ratio of output/input voltage is less than 10%
Inductor
Schottky Diode
Capacitor
Inductor
Schottky Diode
Capacitor
+
Vcc
Icc
Vcc
1
A
L1＝10μH
D1
D2
C1＝10μF(25V) ：ceramic cap GRM31CB31E106KA75L(murata)
C2＝4.7μF(50V) ：ceramic cap GRM32EB31H475KA87L(murata)
C3＝OPEN
L1＝10μH
D1
D2
C1＝100μF(25V)：Al electric capacitor UHD1E101MED(nichicon)
C2＝4.7μF(50V) ：ceramic cap GRM32EB31H475KA87L(murata)
C3＝OPEN
f
OUT
2
SW2
GND
FIN
Fig.4
6/11
：C6-K3LA (MITSUMI)
：RB050LA-30（ROHM）… use when VCC is less than 30V
：RB050LA-40（ROHM）… use when VCC is greater than 30V
：C6-K3LA (MITSUMI)
：RB050LA-30（ROHM）… use when VCC is less than 30V
：RB050LA-40（ROHM）… use when VCC is more than 30V
1kΩ
2kΩ
+
INV
4
SW4
A
Vo
V
I
INV
V
INV
STB
5
Io
A
SW5
VST
ISTB
SW6
Technical Note
2009.05 - Rev.A