BD9870FPS_09 Datasheet, PDF (2/12 Pages) Rohm – Simple Step-down Switching Regulator with Built-in Power MOSFET

BD9870FPS
Technical Note
●Electrical Characteristics（Unless otherwise noted, Ta=25℃,Vcc=12V,Vo=5V,STBY=3V）
Parameter
Symbol
Limit
Unit
MIN
TYP
MAX
Output ON Resistance
Ron
-
1.0
1.5
Ω
Efficiency
η
80
88
-
%
Switching Frequency
fosc
810
900
990
kHz
Load Regulation
ΔVOLOAD
-
5
40
mV
Line Regulation
ΔVOLINE
-
5
25
mV
Over Current ProtectionLimit
Iocp
1.6
-
-
A
INV Pin Threshold Voltage
VINV
0.99
1.00
1.01
V
INV Pin Input Current
IINV
-
1
2
μA
STBY Pin Threshold
ON
VSTBYON 2.0
-
36
V
Voltage
OFF VSTBYOFF -0.3
-
0.3
V
STBYPin Input Current
Istby
5
15
30
μA
Circuit Current
Icc
-
5
12
mA
Stand-by Current
Ist
-
0
5
μA
Soft Start Time
Tss
1
4
10
ms
* This product is not designed to be resistant to radiation.
Conditions
Io＝0.5A
Vcc=20V,
Io=0.5 to 1.5A
Vcc=10 to 30V, Io=1.0A
VINV=1.0V
STBY=3V
INV=2V
STBY＝0V
●Block Diagram
VCC
1
VREF
PWM
COMP
DRIVER
STBY
5
OSC
STBY
TSD
CTL
LOGIC
OCP
OUT
2
Error AMP
INV
4
SS
FIN
GND
Fig.1
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2009.05 - Rev.A