Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
Nonisolated
Compact, low profile surface mount package
Fixed frequency
High efficiency means less power dissipation
Excellent thermal performance
Optimized for cost
Remote on/off
Undervoltage lockout (UVLO)
Over current and short circuit protection
Remote sense
Description
The Bel S7DB-07A modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal
12V source. These converters are available in a range of output voltages from 1.2V to 5.0V. They are packaged in a compact,
low profile, surface mount DIP package for ease of layout and space savings. 7A maximum output is also provided. Standard
features include remote on/off, over current and short circuit protection, UVLO and output voltage adjust. These products may
be used almost anywhere low voltage silicon is employed and a 12V source is available. Typical applications include file
servers, routers, line cards and other computing and communications equipment.
Applications
page 1
S7DB-07A Series
Distributed power architectures
Data networking equipment
Telecommunications
Computers and peripherals
Part Number Selection
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
page 2
Input Specifications
Absolute Maximum Ratings
Note: Use beyond the maximum ratings may cause a reliability degradation of the DC/DC
converter or may permanently damage the device.
Note: Input capacitance two 270F/16V, ESR = 0.018
max at 100kHz @ 25 C.
1. With simulated source impedance of 500nH, 5Hz to 20MHz.
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
page 3
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
1. Vin = 12V, Iout = full load, Ta = 25 C.
2. 0 - 20MHz, 0.1F ceramic cap and 10F aluminum cap on output.
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
page 4
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
3. di/dt = 0.5A/1S, Ta = 25 C with a 220F Tantalum cap at output.
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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
page 5
Note: On/off pin designed to work with an open collector/drain switch.
Control Specifications
General Specifications
1. Vin=12V, full load and Ta=25 C.
2. See graphs on pages 10-13.
3. With remote on/off pin 8 open, the module is on.
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V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
page 6
Efficiency Data
Module 5.0V
84%
86%
88%
90%
92%
94%
1
2
3
4
5
6
7
8
Output Current
E
ffi
c
i
e
n
c
y
10.8v
12.0v
13.2V
Module 3.3V
78%
80%
82%
84%
86%
88%
90%
92%
94%
1
2
3
4
5
6
7
8
Output Current
10.8V
12.0V
13.2V
Module 2.5V
75%
80%
85%
90%
1
2
3
4
5
6
7
8
Output Current
E
ffic
i
e
n
c
y
10.8V
12.0V
13.2V
Module 1.8V
74%
76%
78%
80%
82%
84%
86%
88%
90%
1
2
3
4
5
6
7
8
Output Current
E
f
f
i
ci
e
n
cy
10.8V
12.0V
13.2V
Module 1.5V
74%
79%
84%
89%
1
2
3
4
5
6
7
8
Output Current
Ef
f
i
c
i
e
n
c
y
10.8V
12.0V
13.2V
Module 1.2V
75%
80%
85%
90%
1
2
3
4
5
6
7
8
Output Current
E
f
f
i
ci
e
n
cy
10.8V
12.0V
13.2V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
page 7
Ripple and Noise
Ripple and noise at full load and 12Vdc input,
5.0Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input,
3.3Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input,
2.5Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input,
1.8Vdc output and Ta=25 C
0.1F ceramic cap and 10F aluminum electrolytic cap added at the output.
Ripple and noise at full load and 12Vdc input,
1.5Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input,
1.2Vdc output and Ta=25 C
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
page 8
Transient Response
Transient response: di/dt = 0.5A/S, external load capacitance Co=220F aluminum cap at output
Vout=5.0V
50% to 100% load transients at 12V input and Ta=25 C
Vout=5.0V
100% to 50% load transients at 12V input and Ta=25 C
Vout=3.3V
50% to 100% load transients at 12V input and Ta=25 C
Vout=3.3V
100% to 50% load transients at 12V input and Ta=25 C
Vout=2.5V
50% to 100% load transients at 12V input and Ta=25 C
Vout=2.5V
100% to 50% load transients at 12V input and Ta=25 C
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
page 9
Transient Response
Vout=1.8V
50% to 100% load transients at 12V input and Ta=25 C
Vout=1.8V
100% to 50% load transients at 12V input and Ta=25 C
Transient response: di/dt = 0.5A/S, external load capacitance Co=470F (Tantalum capacitor)
Vout=1.2V
50% to 100% load transients at 12V input and Ta=25 C
Vout=1.5V
50% to 100% load transients at 12V input and Ta=25 C
Vout=1.5V
100% to 50% load transients at 12V input and Ta=25 C
Vout=1.2V
100% to 50% load transients at 12V input and Ta=25 C
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
page 10
Thermal Considerations
Output Voltage Set-Point Adjustment
Derating Curve
Output Current (A)
Output Current vs. Local Ambient
Temperature and Air Velocity
Ambient Temperature, Ta (C)
0
60
30
70
6
7
4
2
0
Natural Convection
100LFM
10
20
40
50
1
3
5
Vo
Trim
Gnd
Vo
Trim
Gnd
Trim Down Test Circuit
Trim Up Test Circuit
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
page 11
S7DB-07A500 Trim Resistor Calculation
Rtrim down =
10.52
Vo Vo, adj
4.55
)
Kohm
(
Rtrim up =
2
Vo, adj Vo
2.05
)
Kohm
(
Output Voltage Set-Point Adjustment
S7DB-07A330 Trim Resistor Calculation
Rtrim down =
5.08
Vo Vo, adj
4.55
)
Kohm
(
Rtrim up =
3.175
Vo, adj Vo
2.05
)
Kohm
(
3.5
3.65
3.8
3.95
4.1
4.25
4.4
4.55
4.7
4.85
5
0.05
5.04
10.04
15.04
20.03
25.03
30.02
35.02
40.01
45
Adjusted outp ut voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or
va
l
u
e
R
t
ri
m
_
dow
n(
K
ohm
)
5
5.05
5.1
5.15
5.2
5.25
5.3
5.35
5.4
5.45
5.5
1
10.9
20.8
30.7
40.6
50.5
60.4
70.3
80.2
90.1
100
Adjusted outp ut voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
or
va
l
u
e
,
Rt
ri
m
_
up(K
o
hm
)
2.31
2.41
2.51
2.61
2.71
2.8
2.9
3
3.1
3.2
3.3
0.05
5.04
10.04
15.04
20.03
25.03
30.02
35.02
40.01
45
Adjusted outp ut voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or
v
a
l
u
e
R
t
ri
m
_
d
o
w
n
(K
oh
m
)
3.3
3.33
3.37
3.4
3.43
3.46
3.5
3.53
3.56
3.6
3.63
1
10.9
20.8
30.7
40.6
50.5
60.4
70.3
80.2
90.1
100
Adjusted outp ut voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
v
a
l
u
e
,
R
t
ri
m
_
up
(K
o
h
m
)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
page 12
S7DB-07A250 Trim Resistor Calculation
Rtrim down =
3.926
Vo Vo, adj
4.64
)
Kohm
(
Rtrim up =
4.02
Vo, adj Vo
1.47
)
Kohm
(
S7DB-07A180 Trim Resistor Calculation
Rtrim down =
3.869
Vo Vo, adj
11.34
)
Kohm
(
Rtrim up =
3.072
Vo, adj Vo
7.5
)
Kohm
(
Output Voltage Set-Point Adjustment
1.75
1.83
1.9
1.98
2.05
2.13
2.2
2.27
2.35
2.42
2.5
0.05
5.04
10.04
15.04
20.03
25.03
30.02
35.02
40.01
45
Adjusted outp ut voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
R
t
ri
m
_do
w
n
(K
o
h
m
)
2.5
2.52
2.55
2.58
2.6
2.63
2.65
2.67
2.7
2.73
2.75
10
19
28
37
46
55
64
73
82
91
100
Adjusted outp ut voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
v
a
l
u
e
,
R
t
ri
m
_up
(K
ohm
)
1.62
1.64
1.66
1.67
1.69
1.71
1.73
1.75
1.76
1.78
1.8
5
19.5
34
48.5
63
77.5
92
106.5
121
135.5
150
Adjusted outp ut voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or
va
l
u
e
R
t
r
i
m
_
d
o
w
n
(K
oh
m
)
1.8
1.84
1.87
1.91
1.94
1.98
2.02
2.05
2.09
2.12
2.16
0.2
10.18
20.16
30.14
40.12
50.1
60.08
70.06
80.04
90.02
Adjusted outp ut voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
v
a
l
u
e
,
R
t
ri
m
_
up
(Koh
m
)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
S7DB-07A150 Trim Resistor Calculation
Rtrim down =
2.704
Vo Vo, adj
11.34
)
Kohm
(
Rtrim up =
3.072
Vo, adj Vo
7.5
)
Kohm
(
S7DB-07A120 Trim Resistor Calculation
Rtrim down =
0.874
Vo Vo, adj
6.58
)
Kohm
(
Rtrim up =
1.728
Vo, adj Vo
4.42
)
Kohm
(
Output Voltage Set-Point Adjustment
page 13
1.35
1.37
1.38
1.4
1.41
1.43
1.44
1.46
1.47
1.49
1.5
5
24.5
44
63.5
83
102.5
122
141.5
161
180.5
200
Adjusted output voltage Vo,adj (V)
T
r
i
m
r
e
s
i
s
t
o
r
va
l
u
e
R
t
r
i
m
_do
w
n
(
K
ohm
)
1.5
1.53
1.56
1.59
1.62
1.65
1.68
1.71
1.74
1.77
1.8
0.2
10.18
20.16
30.14
40.12
50.1
60.08
70.06
80.04
90.02
Adjusted output voltage Vo,adj(V)
T
r
i
m
r
e
s
i
s
t
or
va
l
u
e
,
R
t
r
i
m
_up
(
K
o
h
m
)
1.08
1.09
1.1
1.12
1.13
1.14
1.15
1.16
1.18
1.19
1.2
0.1
10.09
20.08
30.07
40.06
50.05
60.04
70.03
80.02
90.01
Adjusted output voltage Vo,adj (V)
T
r
i
m
r
e
s
i
s
t
or
va
l
u
e
R
t
r
i
m
_do
w
n
(
K
ohm
)
1.2
1.21
1.22
1.24
1.25
1.26
1.27
1.28
1.3
1.31
1.32
1
20.9
40.8
60.7
80.6
100.5
120.4
140.3
160.2
180.1
200
Adjusted output voltage Vo,adj(V)
T
r
i
m
r
e
s
i
s
t
or
va
l
u
e
,
R
t
r
i
m
_up
(
K
ohm
)
CORPORATE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel
201-432-0463
Fax
201-432-9542
www.belfuse.com
FAR EAST
Bel Fuse Ltd.
8F / 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel
852-2328-5515
Fax 852-2352-3706
www.belfuse.com
EUROPE
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel
44-1772-556601
Fax 44-1772-888366
www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 09.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02S7DB-07A
12V Input / 1.2V 5.0V Output / 7A
Mechanical
Dimensions are in inches [millimeters].
Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
n
i
P
n
o
i
t
c
n
u
F
1
d
n
u
o
r
G
2
d
n
u
o
r
G
3
d
n
u
o
r
G
4
d
n
u
o
r
G
5
n
i
V
+
6
n
i
V
+
7
m
i
r
T
8
f
f
O
/
n
O
e
t
o
m
e
R
9
)
+
(
e
s
n
e
S
e
t
o
m
e
R
0
1
o
V
+
1
1
o
V
+
2
1
o
V
+
page 14
1.22 [30.99]
0.394 [10.01]
0.67
[17.00]
0.985 [25.02]
5X
0.197
[5.00]
6X
0.102
[2.59]
0.345
[8.76]
0.010
[0.25]
0.827
[21.01]
2X 0.050 [1.27]
2X 0.079 [1.99]
0.004 [0.10]
0- 5
0.100
[2.54]
0.120 [3.05]
0.197 [5.00]
0.895
[22.73]
Suggested PCB Pad Layout
1
2
3
4
5
6
12 11 10
9
8
7
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