BD9859EFJ Datasheet, PDF (2/16 Pages) Rohm – Simple Step-down Switching Regulators with Built-in Power MOSFET

BD9859EFJ
●Electrical Characteristics
(Unless otherwise specified, Ta=25℃，VCC=12V, Vo=5V,EN=3V)
Item
Symbol
【Circuit Current】
Circuit Current during Standby
Ist
Circuit Current during Operation
Icc
【Low Voltage Input Error Prevention Circuit】
Detect Threshold Voltage
Vuv
Hysteresis Width
Vuvhy
【Oscillator】
Oscillation Frequency
fosc
Max Duty Cycle
Dmax
【Error Amp】
FB Pin Threshold Voltage
VFB
FB Pin Input Current
IFB
Mutual Conductance
Gm
Soft Start Time
Tsoft
【Output-part】
High Side Nch FET ON Resistance
RonH
Nch FET ON Resistance for Pre-Charge RonL
Over Current Detect Current
Iocp
【CTL】
EN Pin Threshold Voltage
ON
OFF
VENON
VENOF
F
EN Pin Input Current
REN
◎Not designed to withstand radiation.
Rating Value
Min
Typ
Max
－
0
10
－
2.8
5.6
4.2
4.4
4.6
-
200
400
675
750
825
75
85
95
0.990
-1.0
70
2.0
1.000
0
140
4.0
1.010
1.0
280
6.0
－
100
200
－
5
10
3.5
5.5
－
2.0
－
14
-0.3
－
0.3
2.5
7.5
15
Technical Note
Unit
Conditions
uA
VEN=0V
mA
FB=1.2V
V
mV
kHz
%
V
uA
uA/V
ms
VFB=0V
IVC=±10uA,VC=1.5V
mΩ
Ω
A
V
V
uA
VEN=3V
●Pin Description
Pin No.
1
2
3
4
5
6
7
8
Pin Name
Lx
GND
VC
FB
EN
BST
VCC
VCC
Function
NMOSFET Source Pin
Ground Pin
Error Amp Output Pin
Output Voltage Return Pin
ON/OFF Control Pin
Capacitor Connection Pin for Bootstrap
Power supply Voltage Pin
Power supply Voltage Pin
Fig.1 Pin Layout Diagram
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2010.02 - Rev.A