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Rohm Semiconductor Electronic Components Datasheet

BD9781HFP Datasheet

Flexible Step-down Switching Regulators

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BD9781HFP pdf
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Single-chip Type with built-in FET Switching Regulator Series
Flexible Step-down
Switching Regulators
with Built-in Power MOSFET
BD9778F, BD9778HFP, BD9001F, BD9781HFP
No.10027EBT41
Overview
The flexible step-down switching regulator controller is a switching regulator controller designed with a high-withstand-voltage
built-in POWER MOS FET, providing a free setting function of operating frequency with external resistor. This switching regulator
controller features a wide input voltage range (7 V to 35 V or 7 V to 48 V) and operating temperature range (-40˚C to +125˚C or
-40˚C to +95˚C). Furthermore, an external synchronization input pin (BD9781HFP) enables synchronous operation with external
clock.
Features
1) Minimal external components
2) Wide input voltage range: 7 V to 35 V (BD9778F/HFP and BD9781HFP), 7 V to 48 V (BD9001F)
3) Built-in P-ch POWER MOS FET
4) Output voltage setting enabled with external resistor: 1 to VIN
5) Reference voltage accuracy: ±2%
6) Wide operating temperature range: -40˚C to +125˚C (BD9778F/HFP and BD9781HFP),
-40˚C to +95˚C (BD9001F)
8) Low dropout: 100% ON Duty cycle
9) Standby mode supply current: 0 µA (Typ.) (BD9778F/HFP and BD9781HFP), 4 µA (Typ.) (BD9001F)
10) Oscillation frequency variable with external resistor: 50 to 300 kHz (BD9001F),
50 to 500 kHz (BD9778F/HFP and BD9781HFP)
11) External synchronization enabled (only on the BD9781HFP)
12) Soft start function : soft start time fixed to 5 ms (Typ.))
13) Built-in overcurrent protection circuit
14) Built-in thermal shutdown protection circuit
15) High power HRP7 package mounted (BD9778HFP and BD9781HFP)
Compact SOP8 package mounted (BD9778F and BD9001F)
Applications
All fields of industrial equipment, such as Flat TV , printer, DVD, car audio, car navigation,
and communication such as ETC, AV, and OA.
Product lineup
Item
Output current
Input range
Oscillation frequency range
External synchronization
Standby function
Operating temperature
Package
BD9778F/HFP
2A
7V ~ 35V
50 ~ 500kHz
Not provided
Provided
-40˚C ~ +125˚C
SOP8 / HRP7
BD9001F
2A
7V ~ 48V
50 ~ 300kHz
Not provided
Provided
-40˚C ~ +95˚C
SOP8
BD9781HFP
4A
7V ~ 35V
50 ~ 500kHz
Provided
Provided
-40˚C ~ +125˚C
HRP7
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/16
2010.02 - Rev. B


Rohm Semiconductor Electronic Components Datasheet

BD9781HFP Datasheet

Flexible Step-down Switching Regulators

No Preview Available !

BD9781HFP pdf
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
0.69
*2
*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
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
Parameter
Operating power supply voltage
BD9778F/HFP
5 ~ 35
BD9001F
7 ~ 48
BD9781HFP
5 ~ 35
Unit
V
Electrical characteristics
BD9778F/HFP (Unless otherwise specified, Ta = -40˚C to +125˚C, VIN =13.2 V, VEN = 5 V)
Parameter
Symbol
Standby circuit current
Circuit current
[SW block]
POWER MOS FET ON resistance
Operating output current of overcurrent protection
Output leak current
[Error Amp block]
Reference voltage 1
Reference voltage 2
Reference voltage input regulation
Input bias current
Maximum FB voltage
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
ISTB
IQ
RON
IOLIMIT
IOLEAK
VREF1
VREF2
∆VREF
IB
VFBH
VFBL
IFBSINK
IFBSOURCE
TSS
FOSC
∆FOSC
VEN
IEN
* Not designed to be radiation-resistant.
Limits
Min. Typ. Max.
- 0 10
- 3 4.2
- 0.53 0.9
24-
- 0 30
0.98
0.96
-
-1
2.4
-
-5.0
70
-
1.00
1.00
0.5
-
2.5
0.05
-3.0
120
5
1.02
1.04
-
-
-
0.10
-0.5
170
-
82 102 122
-1-
0.8 1.7 2.6
- 13 50
Unit
µA
mA
A
µA
V
V
%
µA
V
V
mA
µA
mS
kHz
%
V
µA
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
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
2/16
2010.02 - Rev. B


Part Number BD9781HFP
Description Flexible Step-down Switching Regulators
Manufacturer Rohm
Total Page 19 Pages
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BD9781HFP pdf
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