BD9870FPS_09 ROHM [Rohm], BD9870FPS_09 Datasheet - Page 6
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BD9870FPS_09
Manufacturer Part Number
BD9870FPS_09
Description
Simple Step-down Switching Regulator with Built-in Power MOSFET
Manufacturer
ROHM [Rohm]
Datasheet
1.BD9870FPS_09.pdf
(12 pages)
●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