Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-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 SRDB-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
SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-07A
12V Input / 1.2V 5.0V Output / 7A
page 11
SRDB-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
SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-07A
12V Input / 1.2V 5.0V Output / 7A
page 12
SRDB-07A250 Trim Resistor Calculation
Rtrim down =
3.926
Vo Vo, adj
4.64
)
Kohm
(
Rtrim up =
4.02
Vo, adj Vo
1.47
)
Kohm
(
SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-07A
12V Input / 1.2V 5.0V Output / 7A
SRDB-07A150 Trim Resistor Calculation
Rtrim down =
2.704
Vo Vo, adj
11.34
)
Kohm
(
Rtrim up =
3.072
Vo, adj Vo
7.5
)
Kohm
(
SRDB-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-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
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other
hazardous substances from electronic products. These parts are not however compatible with
the higher temperatures associated with lead free solder processes and must be soldered using
a reflow profile with a peak temperature of no more than 240C.
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