BD9870FPS_09 Datasheet, PDF (6/12 Pages) Rohm – Simple Step-down Switching Regulator with Built-in Power MOSFET

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