BD9778F-TR View Datasheet(PDF) - ROHM Semiconductor
Part Name
Description
Manufacturer
BD9778F-TR Datasheet PDF : 17 Pages
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BD9778F, BD9778HFP, BD9001F, BD9781HFP
Absolute Maximum Ratings(Ta = 25˚C)
Power supply
voltage
Parameter
BD9778F/HFP,BD9781HFP
BD9001F
Symbol
VIN
Limits
36
50
Output switch pin voltage
Output switch current
BD9778F/HFP, BD9001F
BD9781HFP
VSW
ISW
VIN
2
*1
4
*1
EN/SYNC, EN pin voltage
RT, FB, INV pin voltage
Power dissipation
HRP7
SOP8
VEN/SYNC,VEN
VRT,VFB,VINV
Pd
VIN
7
5.5
*2
0.69
*3
Operating temperature BD9778F/HFP,BD9781HFP
range
BD9001F
Storage temperature range
Maximum junction temperature
Topr
Tstg
Tjmax
-40 ~ +125
-40 ~ +95
-55 ~ +150
150
*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.
Technical Note
Unit
V
V
A
V
W
˚C
˚C
˚C
Recommended operating range
Parameter
Operating power supply voltage
Output switch current
Output voltage (ON Duty)
Oscillation frequency
Oscillation frequency set resistance
BD9778F/HFP
7 ~ 35
~2
6 ~ 100
50 ~ 500
40 ~ 800
BD9001F
BD9781HFP Unit
7 ~ 48
7 ~ 35
V
~2
~4
A
6 ~ 100
6 ~ 100
%
50 ~ 300
50 ~ 500
kHz
100 ~ 800
39 ~ 800
kΩ
Possible operating range
Parameter
Operating power supply voltage
BD9778F/HFP
5 ~ 35
BD9001F
7 ~ 48
BD9781HFP Unit
5 ~ 35
V
Electrical characteristics
BD9778F/HFP (Unless otherwise specified, Ta = -40˚C to +125˚C, VIN =13.2 V, VEN = 5 V)
Parameter
Symbol
Limits
Min. Typ. Max.
Unit
Standby circuit current
ISTB
-
0 10 µA
Circuit current
IQ
- 3 4.2 mA
[SW block]
POWER MOS FET ON resistance
RON
- 0.53 0.9 Ω
Operating output current of overcurrent protection IOLIMIT
2
4
-
A
Output leak current
IOLEAK
-
0 30 µA
[Error Amp block]
Reference voltage 1
VREF1 0.98 1.00 1.02 V
Reference voltage 2
VREF2 0.96 1.00 1.04 V
Reference voltage input regulation
∆VREF
- 0.5 - %
Input bias current
IB
-1 - - µA
Maximum FB voltage
VFBH
2.4 2.5 -
V
Minimum FB voltage
VFBL
- 0.05 0.10 V
FB sink current
IFBSINK -5.0 -3.0 -0.5 mA
FB source current
IFBSOURCE 70 120 170 µA
Soft start time
TSS
- 5 - mS
[Oscillator block]
Oscillation frequency
FOSC
82 102 122 kHz
Frequency input regulation
∆FOSC -
1
-
%
[Enable block]
Threshold voltage
VEN
0.8 1.7 2.6 V
Sink current
IEN
- 13 50 µA
* Not designed to be radiation-resistant.
Condition
VEN=0V,Ta=25˚C
IO=0A
ISW=50mA
* Design assurance
VIN=35V,VEN=0V
VFB=VINV,Ta=25˚C
VFB=VINV
VIN=5 ~ 35V
VINV=1.1V
VINV=0.5V
VINV=1.5V
VFB=1.5V,VINV=1.5V
VFB=1.5V,VINV=0.5V
* Design assurance
RT=390kΩ
VIN=5 ~ 35V
VEN=5V
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2/16
2010.02 - Rev. B
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