Datasheet
2/16
Technical Note
Absolute Maximum Ratings(Ta = 25˚C)
Recommended operating range
Electrical characteristics
*1 Should not exceed Pd-value.
*2 Reduce by 44mW/°C over 25°C, when mounted on 2-layer PCB of 70 X 70 X 1.6 mm3.
(PCB incorporates thermal via. Copper foil area on the front side of PCB: 10.5 X 10.5 mm2. Copper foil area on the reverse side of PCB: 70 X 70 mm2)
*3 Reduce by 5.52 mW/°C over 25°C, when mounted on 2-layer PCB of 70 X 70 X 1.6 mm3.
Output switch pin voltage
Output switch current
BD9778F/HFP,BD9781HFP
BD9778F/HFP,BD9781HFP
BD9778F/HFP, BD9001F
BD9001F
BD9001F
BD9781HFP
HRP7
SOP8
Power dissipation
Parameter Symbol Unit
V
EN/SYNC,VEN
VRT,VFB,VINV
A
P
d
Limits
5.5
0.69
V
IN
2
EN/SYNC, EN pin voltage
V
IN
VSW
ISW
50
W
Topr
Tstg
Tjmax
-
40 ~ +95
-
40 ~ +125
-
55 ~ +150
˚C
˚C
˚C
Power supply
voltage
Operating temperature
range
V
IN
36
V
V
V
*1
4
*1
*2
*3
RT, FB, INV pin voltage
Storage temperature range
Maximum junction temperature
7
150
BD9778F/HFP
7 ~ 35
~ 2
6 ~ 100
50 ~ 500
40 ~ 800
Parameter
Operating power supply voltage
Output switch current
Output voltage (ON Duty)
Oscillation frequency
Oscillation frequency set resistance
BD9001F
7 ~ 48
~ 2
6 ~ 100
50 ~ 300
100 ~ 800
BD9781HFP
7 ~ 35
~ 4
6 ~ 100
50 ~ 500
39 ~ 800
Unit
V
A
%
kHz
kΩ
Possible operating range
BD9778F/HFP
5 ~ 35
Parameter
Operating power supply voltage
BD9001F
7 ~ 48
BD9781HFP
5 ~ 35
Unit
V
BD9778F/HFP (Unless otherwise specified, Ta = -40˚C to +125˚C, VIN =13.2 V, VEN = 5 V)
Circuit current
Standby circuit current
Reference voltage 2
Reference voltage 1
[Error Amp block]
Reference voltage input regulation
Input bias current
Maximum FB voltage
Parameter
Limits
Typ.Min. Max.
0.96
-
-
-
Operating output current of overcurrent protection
2
-
Symbol
I
OLIMIT
IOLEAK
VREF2
VREF1
∆VREF
IQ
ISTB
RON
IB
VFBH
VFBL
IFBSINK
IFBSOURCE
TSS
FOSC
VEN
IEN
∆FOSC
-
1
2.4
70
-
-
82
-
0.8
-
Condition
V
EN=5V
V
FB=VINV
VFB=1.5V,VINV=1.5V
VFB=1.5V,VINV=0.5V
kHz
V
IN=5 ~ 35V
V
IN=5 ~ 35V
V
INV=1.1V
VINV=0.5V
V
INV=1.5V
V
IN=35V,VEN=0V
V
EN=0V,Ta=25˚C
I
O=0A
I
SW=50mA
* Design assurance
* Design assurance
Output leak current
[SW block]
POWER MOS FET ON resistance
Minimum FB voltage
FB sink current
FB source current
Soft start time
[Oscillator block]
Oscillation frequency
Frequency input regulation
[Enable block]
Threshold voltage
Sink current
-
-
5.0
Unit
A
µA
µA
V
%
mA
Ω
µA
V
V
mA
µA
mS
R
T=390kΩ
V
µA
%
1.00
3
0.53
4
0.5
-
2.5
120
0.05
5
102
1
1.7
13
0
0
-
3.0
1.04
0.98 V
FB=VINV,Ta=25˚CV1.00 1.02
4.2
10
0.9
-
-
-
-
170
0.10
-
122
-
2.6
50
30
-
0.5
* Not designed to be radiation-resistant.
2010.02 -
Rev. B
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BD9778F, BD9778HFP, BD9001F, BD9781HFP