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)
2)
3)
4)
5)
6)
8)
9)
10)
11)
12)
13)
14)
15)
Minimal external components
Wide input voltage range: 7 V to 35 V (BD9778F/HFP and BD9781HFP), 7 V to 48 V (BD9001F)
Built-in P-ch POWER MOS FET
Output voltage setting enabled with external resistor: 1 to V
IN
Reference voltage accuracy: ±2%
Wide operating temperature range: -40˚C to +125˚C (BD9778F/HFP and BD9781HFP),
-40˚C to +95˚C (BD9001F)
Low dropout: 100% ON Duty cycle
Standby mode supply current: 0 µA (Typ.) (BD9778F/HFP and BD9781HFP), 4 µA (Typ.) (BD9001F)
Oscillation frequency variable with external resistor: 50 to 300 kHz (BD9001F),
50 to 500 kHz (BD9778F/HFP and BD9781HFP)
External synchronization enabled (only on the BD9781HFP)
Soft start function : soft start time fixed to 5 ms (Typ.))
Built-in overcurrent protection circuit
Built-in thermal shutdown protection circuit
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
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© 2010 ROHM Co., Ltd. All rights reserved.
1/16
Dec.2015 - Rev.C
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Absolute Maximum Ratings(Ta = 25˚C)
Parameter
BD9778F/HFP,BD9781HFP
Power supply
BD9001F
voltage
Output switch pin voltage
Output switch current
BD9778F/HFP, BD9001F
BD9781HFP
Technical Note
Symbol
V
IN
V
SW
I
SW
V
EN/SYNC,
V
EN
V
RT,
V
FB,
V
INV
P
d
T
opr
T
stg
T
jmax
EN/SYNC, EN pin voltage
RT, FB, INV pin voltage
Power dissipation
HRP7
SOP8
Operating temperature
BD9778F/HFP,BD9781HFP
range
BD9001F
Storage temperature range
Maximum junction temperature
Limits
36
50
V
IN
2
4
V
IN
7
5.5
0.69
-40 ~ +125
-40 ~ +95
-55 ~ +150
150
Unit
V
V
*1
*1
A
V
*2
*3
W
˚C
˚C
˚C
*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.
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, V
IN
=13.2 V, V
EN
= 5 V)
Parameter
Symbol
Min.
-
-
-
2
-
0.98
0.96
-
-1
2.4
-
-5.0
70
-
82
-
0.8
-
Limits
Typ. Max.
0
10
3
4.2
0.53
4
0
1.00
1.00
0.5
-
2.5
0.05
-3.0
120
5
102
1
1.7
13
0.9
-
30
1.02
1.04
-
-
-
0.10
-0.5
170
-
122
-
2.6
50
Unit
µA
mA
Ω
A
µA
V
V
%
µA
V
V
mA
µA
mS
kHz
%
V
µA
Condition
V
EN
=0V,Ta=25˚C
I
O
=0A
I
SW
=50mA
* Design assurance
V
IN
=35V,V
EN
=0V
V
FB
=V
INV
,Ta=25˚C
V
FB
=V
INV
V
IN
=5 ~ 35V
V
INV
=1.1V
V
INV
=0.5V
V
INV
=1.5V
V
FB
=1.5V,V
INV
=1.5V
V
FB
=1.5V,V
INV
=0.5V
* Design assurance
R
T
=390kΩ
V
IN
=5 ~ 35V
V
EN
=5V
I
STB
Standby circuit current
I
Q
Circuit current
[SW block]
R
ON
POWER MOS FET ON resistance
I
OLIMIT
Operating output current of overcurrent protection
I
OLEAK
Output leak current
[Error Amp block]
V
REF1
Reference voltage 1
V
REF2
Reference voltage 2
∆V
REF
Reference voltage input regulation
I
B
Input bias current
V
FBH
Maximum FB voltage
V
FBL
Minimum FB voltage
I
FBSINK
FB sink current
I
FBSOURCE
FB source current
T
SS
Soft start time
[Oscillator block]
F
OSC
Oscillation frequency
∆F
OSC
Frequency input regulation
[Enable block]
V
EN
Threshold voltage
I
EN
Sink current
* Not designed to be radiation-resistant.
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© 2010 ROHM Co., Ltd. All rights reserved.
2/16
Dec.2015 - Rev.C
BD9778F, BD9778HFP, BD9001F, BD9781HFP
BD9001F (Unless otherwise specified, Ta=-40˚C ~ +95˚C,V
IN
=13.2V, V
EN
=5V)
Parameter
Symbol
Min.
-
-
-
2.5
0.98
0.96
-
-1
2.4
-
-5.0
70
-
82
-
0.8
-
Limits
Typ. Max.
4
10
3
4.2
0.6
4
1.00
1.00
0.5
-
2.5
0.05
-3.0
120
5
102
2
1.7
13
1.2
-
1.02
1.04
-
-
-
0.10
-0.5
170
-
122
-
2.6
50
Unit
µA
mA
Ω
A
V
V
%
µA
V
V
mA
µA
ms
kHz
%
V
µA
Condition
V
EN
=0V,Ta=25˚C
I
O
=0A
I
SW
=50mA
* Design assurance
V
FB
=V
INV
,Ta=25˚C
V
FB
=V
INV
V
IN
=7 ~ 48V
V
INV
=1.1V
V
INV
=0.5V
V
INV
=1.5V
V
FB
=1.5V,V
INV
=1.5V
V
FB
=1.5V,V
INV
=0.5V
* Design assurance
R
T
=390kΩ
V
IN
=7 ~ 48V
Technical Note
Standby circuit current
I
STB
I
Q
Circuit current
[SW block]
R
ON
POWER MOS FET ON resistance
I
OLIMIT
Operating output current of overcurrent protection
[Error Amp block]
V
REF1
Reference voltage 1
V
REF2
Reference voltage 2
∆V
REF
Reference voltage input regulation
I
B
Input bias current
V
FBH
Maximum FB voltage
V
FBL
Minimum FB voltage
I
FBSINK
FB sink current
I
FBSOURCE
FB source current
Soft start time
Tss
[Oscillator block]
F
OSC
Oscillation frequency
∆F
OSC
Frequency input regulation
[Enable block]
V
EN
Threshold voltage
I
EN
Sink current
* Not designed to be radiation-resistant.
V
EN
=5V
BD9781HFP (Unless otherwise specified, Ta=-40˚C ~ +125˚C,V
IN
=13.2V,V
EN/SYNC
=5V)
Parameter
Symbol
Limits
Min. Typ. Max.
-
0
10
8
-
3
-
4
-
0.98
0.97
-
-1
2.4
-
-5.0
70
-
82
-
0.8
-
-
0.5
8
0
1.00
1.00
0.5
-
2.5
0.05
-3.0
120
5
102
1
1.7
35
150
0.9
-
30
1.02
1.03
-
-
-
0.10
-0.5
170
-
122
-
2.6
90
-
Unit
µA
mA
Ω
A
µA
V
V
%
µA
V
V
mA
µA
mS
kHz
%
V
µA
kHz
Condition
V
EN/SYNC
=0V,Ta=25ºC
I
O
=0A
I
SW
=50mA
* Design assurance
V
IN
=35V,V
EN/SYNC
=0V
V
FB
=V
INV
,Ta=25ºC
V
FB
=V
INV
V
IN
=5 ~ 35V
V
INV
=1.1V
V
INV
=0.5V
V
INV
=1.5V
V
FB
=1.5V,V
INV
=1.5V
V
FB
=1.5V,V
INV
=0.5V
* Design assurance
R
T
=390kΩ
V
IN
=5 ~ 35V
V
EN/SYNC
=5V
F
EN/SYNC
=150kHz
I
STB
Standby circuit current
I
Q
Circuit current
[SW block]
R
ON
POWER MOS FET ON resistance
I
OLIMIT
Operating output current of overcurrent protection
I
OLEAK
Output leak current
[Error Amp block]
Reference voltage1
V
REF1
V
REF2
Reference voltage2
∆V
REF
Reference voltage input regulation
I
B
Input bias current
V
FBH
Maximum FB voltage
V
FBL
Minimum FB voltage
I
FBSINK
FB sink current
I
FBSOURCE
FB source current
T
SS
Soft start time
[Oscillator block]
F
OSC
Oscillation frequency
∆F
OSC
Frequency input regulation
[Enable/Synchronizing input block]
V
EN/SYNC
Threshold voltage
I
EN/SYNC
Sink current
F
SYNC
External synchronizing frequency
* Not designed to be radiation-resistant.
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© 2010 ROHM Co., Ltd. All rights reserved.
3/16
Dec.2015 - Rev.C
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Reference data
Technical Note
OSCILLATING FREQUENCY : fosc[kHz]
1.020
REFERENCE VOLTAGE : V
REF
[V]
1.015
1.010
1.005
1.000
0.995
0.990
0.985
0.980
-50
-25
0
25
50
75
100
125
600
500
400
300
200
100
0
-50
390kΩ
910kΩ
91kΩ
10
STAND-BY CURRENT : I
STB
[µA]
39kΩ
9
8
7
6
5
4
3
2
1
0
0
5
10
15
20
25
-40
V
CC
=12V
Istb=0.14µA
125
-25
0
25
50
75
100 125
25
30
35
40
AMBIENT TEMPERATURE : Ta[ ]
AMBIENT TEMPERATURE : Ta[ ]
INPUT VOLTAGE : V
IN
[V]
Fig.1 Output reference voltage vs.
Ambient temprature
(All series)
Fig.2 Frequency vs. Ambient
temperature
(All series)
Fig.3 Standby current
(BD9781HFP)
10
STAND-BY CURRENT : I
STB
[µA]
STAND-BY CURRENT : I
STB
[µA]
40
125
4
CIRCUIT CURRENT : I
CC
[mA]
9
8
7
6
125
30
25
3
-40
25
125
5
4
3
2
1
0
0
5
25
-40
V
CC
=12V
Istb=0.14µA
20
–40
2
10
1
0
10 15 20 25 30
INPUT VOLTAGE : V
IN
[V]
35
40
0
10
20
30
40
50
60
0
5
10
15
20
25
30
35
40
INPUT VOLTAGE : V
IN
[V]
INPUT VOLTAGE : V
IN
[V]
Fig.4 Standby current
(BD9778F/HFP)
Fig.5 Standby current
(BD9001F)
Fig.6 Circuit current
(BD9781HFP)
4
CIRCUIT CURRENT : I
CC
[mA]
CIRCUIT CURRENT : I
CC
[mA]
-40
25
125
4
1.8
1.6
FET ON RESISTANCE : R
ON
[Ω]
3
3
125
-40
25
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
OUTPUT CURRENT : I
O
[A]
Ta=-40
Ta=125
Ta=25
2
2
1
1
0
0
5
10 15 20 25 30
INPUT VOLTAGE : V
IN
[V]
35
40
0
10
20
30
40
50
INPUT VOLTAGE : V
IN
[V]
60
Fig.7 Circuit current
(BD9778F/HFP)
Fig.8 Circuit current
(BD9001F)
Fig.9 ON resistance V
IN
=5V
(BD9781HFP)
1.8
1.8
FET ON RESISTANCE : R
ON
[Ω]
FET ON RESISTANCE : R
ON
[Ω]
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.0
0.5
1.0
1.5
2.0
2.5
Ta=-40
Ta=125
Ta=25
FET ON RESISTANCE : R
ON
[Ω]
1.6
1.4
1.2
1.0
0.8
0.6
0.4
Ta=-40
Ta=25
Ta=125
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
Ta=-40
Ta=25
Ta=125
0.2
0.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
OUTPUT CURRENT : I
O
[A]
0.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
OUTPUT CURRENT : I
O
[A]
OUTPUT CURRENT : I
O
[A]
Fig.10 ON resistance V
IN
=7V
(BD9781HFP)
Fig.11 ON resistanceV
IN
=13.2V
(BD9781HFP)
Fig.12 ON resistance V
IN
=5V
(BD9778F/HFP)
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4/16
Dec.2015 - Rev.C
BD9778F, BD9778HFP, BD9001F, BD9781HFP
1.8
FET ON RESISTANCE : R
ON
[Ω]
FET ON RESISTANCE : R
ON
[Ω]
Technical Note
1.8
FET ON RESISTANCE : RON[Ω]
1.8
1.6
1.4
1.2
1.0
0.8
Ta=125
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.0
0.5
1.0
1.5
2.0
OUTPUT CURRENT : I
O
[A]
2.5
Ta=125
Ta=25
Ta=-40
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
0.5
1
1.5
2
OUTPUT CURRENT : I
O
[A]
2.5
Ta=125
Ta=25
0.6
Ta=25
0.4
0.2
0.0
0.0
Ta=-40
Ta=–40
0.5
1.0
1.5
2.0
OUTPUT CURRENT : I
O
[A]
2.5
Fig.13 ON resistance V
IN
=7V
(BD9778F/HFP)
Fig.14 ON resistance V
IN
=13.2V
(BD9778F/HFP)
Fig.15 ON resistance V
IN
=7V
(BD9001F)
1.8
CONVERSION EFFICIENCY [%]
100
CONVERSION EFFICIENCY [%]
100
5V output
FET ON RESISTANCE : RON[Ω]
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
0.5
1
1.5
2
OUTPUT CURRENT : I
O
[A]
2.5
Ta=–40
Ta=125
Ta=25
5V output 3.3V output
90
80
70
60
50
40
30
20
10
0
0.0
0.5
3.3V output
90
80
70
60
50
40
30
20
10
2.5V output
1.5V output
2.5V output
1.0
1.5
2.0
2.5
OUTPUT CURRENT : I
O
[A]
3.0
0
0
1.5
0.5
1.0
OUTPUT CURRENT : I
O
[A]
2.0
Fig.16 ON resistance V
IN
=13.2V
(BD9001F)
Fig.17 I
O
vs Efficiency(V
IN
=12V,f=200kHz)
(BD9781HFP)
Fig.18 I
O
vs Efficiency(V
IN
=12V,f=100kHz)
(BD9778F/HFP)
100
CONVERSION EFFICIENCY [%]
6
5V output
Ta=25
Ta=-40
6
Ta=25
90
80
70
60
50
40
30
20
10
0
0
OUTPUT VOLTAGE : V
O
[V]
5
4
Ta=125
5
Ta=-40
3.3V output
2.5V output
OUTPUT VOLTAGE : V
O
[V]
4
3
2
1
0
Ta=125
3
2
1
0
0.4
0.8
1.2
1.6
OUTPUT CURRENT : I
O
[A]
2
0
1
2
3
4
5
6
OUTPUT CURRENT : I
O
[A]
7
0
1
2
3
4
OUTPUT CURRENT : I
O
[A]
5
Fig.19 I
O
vs Efficiency(V
IN
=12V,f=100kHz) Fig.20 Current capacitance(V
IN
=12V,Vo=5V,f=100kHz) Fig.21 Current capacitance(V
IN
=12V,Vo=5V,f=100kHz)
(BD9001F)
(BD9781HFP)
(BD9778F/HFP)
6
5
4
Ta=125
Ta=25
Ta=-40
OUTPUT VOLTAGE : V
O
[V]
3
2
1
0
0
1
2
3
4
OUTPUT CURRENT : I
O
[A]
5
Fig.22 Current capacitance(V
IN
=12V,Vo=5V,f=100kHz)
(BD9001F)
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5/16
Dec.2015 - Rev.C
