Data Sheet
Step-down DC/DC Converters(Non-isolated)
BP5220A / BP5221A / BP5222A
Description
The BP5220A, BP5221A, BP5222A, are DC / DC
converters that use a pulse width modulation (PWM)
system. They contain control circuits, switching devices,
rectifiers, and coils, and operate by only connecting an
I / O smoothing capacitor. With a high efficiency of power
conversion, the modules are available in stand-alone
9-pin SIP packages with no heat sink required.
They can be applied to various purposes by fine-tuning
the output voltage and switching on and off. With a wide
range of input voltage, the modules are best suited for
obtaining a stable local power supply from a main
power supply with a large voltage variation.
Applications
Power supplies for copiers, personal computers,
facsimiles, AV equipment, measuring instruments,
vending machines, security device, registers,
industrial equipment, and maintenance tools
Features
1) Wide input voltage range
2) High power conversion efficiency.
3) Built-in output ON / OFF switch.
4) Adjustable output voltage ensures wide compatibility
5) Few external components required.
6) Heat sink unnecessary.
7) Compact package.
BP5220A / BP5221A / BP5222A : SIP9
Dimensions
(Unit : mm)
28.0 Max.
12.0
Max.
Marked side
Marked side
19.5 Max.
Pin No. 1 2 3 4 5 6 7
2.54
2.54x
8=20.32
9
0.5
1.4
4±1
4.0
Max.
8.0
Max.
Note : Dimensions without tolerance is typical.
SIP9
Lineup
BP5220A
Input voltage
Output voltage
Output current
Power conversion
efficiency
8 to 38
5
1
85
(Vi=15V)
BP5221A
8 to 38
5
0.5
84
(Vi=15V)
BP5222A
15 to 38
12
0.5
90
(Vi=20V)
Unit
V
V
A
%
Absolute maximum ratings (Ta=25°C)
Parameter
Input voltage
Output current
Operating temperature range
Storage temperature range
Symbol
BP5220A
Vi
I
O
Topr
Tstg
8 to 38
1
Limits
BP5221A
8 to 38
0.5
BP5222A
15 to 38
0.5
V
A
Unit
°C
°C
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© 2010 ROHM Co., Ltd. All rights reserved.
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2010.03 -
Rev. B
BP5220A/BP5221A/BP5222A
Data Sheet
Block diagram
BP5220A / BP5221A / BP5222A
DRIVE CIRCUIT
POWER
SUPPLY
CIRCUIT
CONTROL CIRCUIT
N. C.
9
Vi
7
6
ADJ
N. C.
5
N. C.
4
CTL
3
GND
2
V
OUT
1
FB
Electrical characteristics
BP5220A
(Unless otherwise noted : Vi=15V, Io=0.5A, SW=1, Ta=25˚C)
Parameter
Input voltage
Output voltage
Output current
Line regulation
Load regulation
Output ripple voltage
Power conversion efficiency
Switching frequency
CTL pin ON resistance
CTL pin OFF resistance
f
SW
R
ON
R
OFF
200
75
Symbol
Vi
V
O
I
O
27
13
22
85
190
4.7
Min.
8
4.75
5
Typ.
Max.
38
5.25
1
80
80
70
Unit
V
V
A
mV
mV
mV
PP
%
kHz
Vo>4.75V
Vo<0.1V, SW=2
Io=1A
Vi<30V
Vi=8V to 38V
Io=0.1A to 1A
Conditions
BP5221A
(Unless otherwise noted : Vi=15V, Io=0.25A, SW=1, Ta=25˚C)
Parameter
Input voltage
Output voltage
Output current
Line regulation
Load regulation
Output ripple voltage
Power conversion efficiency
Switching frequency
CTL pin ON resistance
CTL pin OFF resistance
f
SW
R
ON
R
OFF
200
70
Symbol
Vi
V
O
I
O
13
3
25
84
190
4.7
Min.
8
4.75
5
Typ.
Max.
38
5.25
0.5
50
50
70
Unit
V
V
A
mV
mV
mV
PP
%
kHz
Vo>4.75V
Vo<0.1V, SW=2
Io=1A
Vi=8V to 38V
Io=0.05A to 0.5A
Conditions
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© 2010 ROHM Co., Ltd. All rights reserved.
2/7
2010.03 -
Rev. B
BP5220A/BP5221A/BP5222A
Data Sheet
BP5222A
(Unless otherwise noted : Vi=20V, Io=0.25A, SW=1, Ta=25˚C)
Parameter
Input voltage
Output voltage
Output current
Line regulation
Load regulation
Output ripple voltage
Power conversion efficiency
Switching frequency
CTL pin ON resistance
CTL pin OFF resistance
f
SW
R
ON
R
OFF
200
75
Symbol
Vi
V
O
I
O
22
18
29
90
190
4.7
Min.
15
11.2
12
Typ.
Max.
38
12.8
0.5
50
50
70
Unit
V
V
A
mV
mV
mV
PP
%
kHz
Vo>11.2V
Vo<0.1V, SW=2
Io=0.5A
Vi=15V to 38V
Io=0.05A to 0.5A
Conditions
Measurement circuit
BP5220A / BP5221A / BP5222A
9
Input
7
6
5
4
3
2
1
A
SW
1
2
+
+
A
Output
V
V
f
200k
f ; Frequency counter
4.7k
T
Fig.1
Switching frequency=1/T
Output ripple voltage
Please note that output ripple voltage depends on the type and characteristics of the output capacitor.
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3/7
2010.03 -
Rev. B
BP5220A/BP5221A/BP5222A
Data Sheet
Circuit operation
(1) The basic application examples are shown in Fig.2.
The only external parts required are the input and
output smoothing capacitors.
(2) Switching on and off the output voltage is allowed.
The output can be switched off by making pin 4
open (high impedance). (See Fig.3)
BP5220A / BP5221A / BP5222A
9
7
6
5
4
3
2
1
Vi
Be sure to use fuse for safety.
+
+
V
O
(3) Fine adjustment of the output voltage is allowed.
Adjustment of the output voltage can be
performed from pin 6 via the resistor by connecting
the output terminal (pin 2) or GND. (See
application example 3)
Be sure to use fuse for safety.
Vi
Fig.2
BP5220A / BP5221A / BP5222A
Output OFF
9
7
6
5
4
3
2
1
V
O
SW
+
+
Fig.3
Application Examples
Application Example 1 : DC / DC converter with protection circuit
BP5220A / BP5221A / BP5222A
Vi
24V
+
6
9
7
6
5
4
3
2
1
V
O
5V
OUTPUT VOLTAGE (V)
+
5
4
3
2
1
0
Vi
=
24V
120pF
COMP.
+
BA10393
0.2
0.4
0.6
0.8
1.0
1.2
OUTPUT CURRENT (A)
Fig.4
Fig.5
A resistor is used to limit the rise of output at power on. The resistance depends on the input voltage.
This is a standard application. Because the control current fluctuates with variations in circuits and components,
set the control current by adding a sufficient margin to the normal current level.
Application Example 2 : Output ON / OFF control
BP5220A / BP5221A / BP5222A
Be sure to use fuse for safety.
Vi
+
+
9
7
6
5
4
3
2
1
V
O
100 F
ON / OFF
100k
2SC1740
100k
470 F
Fig.6
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4/7
2010.03 -
Rev. B
BP5220A/BP5221A/BP5222A
Data Sheet
Application Example 3 : Output voltage adjustment
(1) When reducing the output voltage
BP5220A / BP5221A / BP5222A
9
Vi
+
(2) When increasing the output voltage
BP5220A / BP5221A / BP5222A
1
V
O
Vi
+
7
6
5
4
3
2
9
7
6
5
4
3
2
1
V
O
Be sure to use
fuse for safety.
VR
+
100 F
Be sure to use
fuse for safety.
VR
+
470 F
Fig.7
Fig.8
VR value setting equations (The output voltage after adjustment is denoted by Vo.)
(1) When reducing the output voltage
BP5220A / BP5221A
BP5222A
(2) When increasing the output voltage
BP5220A / BP5221A
BP5222A
To maximize performance we recommended the output voltage be
adjusted within ±20% of the output voltage rating. When the output voltage is increased by 20%, for
instance, the minimum input voltage is also increased by 20%.
(Example : When the output voltage is changed from 5V to 6V in the BP5220A, the minimum input voltage
is charged from 8V to 9.6V)
Application Example 4 : Slow start
The slow start circuit mitigates the pulse load on the internal switching transistor when input voltage is applied,
and increases the output voltage gradually by starting the switching operation slowly.
This application is useful for preventing malfunction of an external protection circuit due to rush current,
and can serve as a countermeasure against operation outside the safe operation range.
BP5220A / BP5221A / BP5222A
9
Vi
24V
+
7
6
5
4
3
2
1
V
O
+
100 F
Be sure to use
fuse for safety.
470 F
470k
2SC1740R
100k
+
C1
10 F
Fig.9
C1 is a slow-start capacitor for mitigating excessive rush current that flows into the module when the switch is
turned on.
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5/7
2010.03 -
Rev. B
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