Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
Nonisolated
Compact, low profile surface mount package
Wide input
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
Active high/low
Description
The Bel SRDB-10E modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal
4.5V to 13.2V source. These converters are available in a range of output voltages from 1.0V to 5.0V. The output is closely
regulated and the efficiency of the 3.3V output module is typically 88% at full load. The modules are packaged in a compact,
low profile, surface mount DIP package for ease of layout and space savings. 10A maximum output is also provided. Standard
features include remote on/off, remote sense, 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 4.5V to 13.2V source is available.
Typical applications include file servers, routers, line cards and other computing and communications equipment.
Applications
page 1
SRDB-10E 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
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
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
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
page 3
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
1. Vin = 8V, Iout = full load, Ta = 25 C.
2. Two 270F/16V with ESR = 0.018
max at input, 0 - 20MHz BW, 1F ceramic cap and 10F aluminum 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
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
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/S, Ta = 25 C with external 220F Tan cap.
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0
1
s
d
a
o
L
x
a
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f
o
%
0
5
o
t
%
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1
V
0
8
0
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1
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6
0
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o
%
0
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o
t
%
0
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1
V
0
8
0
5
1
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m
e
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i
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s
T
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6
0
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e
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t
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r
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3
d
a
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0
0
1
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%
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V
t
u
p
n
I
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2
.
3
1
o
t
V
5
.
4
t
u
p
t
u
O
V
0
.
1
0
8
0
5
1
V
m
e
m
i
T
g
n
il
t
t
e
S
s
T
0
6
0
0
1
s
d
a
o
L
x
a
M
f
o
%
0
5
o
t
%
0
0
1
V
0
8
0
5
1
V
m
e
m
i
T
g
n
il
t
t
e
S
s
T
0
6
0
0
1
s
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
page 5
Control Specifications
General Specifications
1. Vin=12V, full load and Ta=25 C.
2. See graphs on pages 13 - 16.
Note: For 3.3V output module, when the input voltage is between 4.5Vdc to 5.0Vdc, the output voltage
trim range is 90%-105%, and the remote sense compensation is 5%.
3. With remote on/off pin 8 open, the module is on.
r
e
t
e
m
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5
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2
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8
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1
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5
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1
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2
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1
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1
8
8
5
8
3
8
9
7
7
7
4
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2
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1
9
8
8
6
8
2
8
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7
7
5
7
%
y
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1
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2
5
V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
page 6
Efficiency Data
Module 5.0V
74%
76%
78%
80%
82%
84%
86%
88%
90%
92%
94%
96%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
OUTPUT CURRENT
E
F
F
I
CI
E
NCY
8.0V
10.8V
13.2V
Module 3.3V
66%
70%
74%
78%
82%
86%
90%
94%
98%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
OUTPUT CURRENT
E
F
F
I
CI
E
NCY
4.5V
8.0V
13.2V
Module 2.5V
64%
68%
72%
76%
80%
84%
88%
92%
96%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
OUTPUT CURRENT
E
F
F
I
C
I
E
NCY
4.5V
8.0V
13.2V
Module 1.8V
62%
66%
70%
74%
78%
82%
86%
90%
94%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
OUTPUT CURRENT
E
F
F
I
CI
E
NCY
4.5V
8.0V
13.2V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
Efficiency Data
page 7
Module 1.5V
60%
64%
68%
72%
76%
80%
84%
88%
92%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
OUTPUT CURRENT
E
FFI
C
I
E
N
C
Y
4.5V
8.0V
13.2V
Module 1.2V
56%
60%
64%
68%
72%
76%
80%
84%
88%
92%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
OUTPUT CURRENT
E
F
F
I
CI
E
N
CY
4.5V
8.0V
13.2V
Module 1.0V
54%
58%
62%
66%
70%
74%
78%
82%
86%
90%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
OUTPUT CURRENT
E
F
F
IC
IE
N
C
Y
4.5V
8.0V
13.2V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
page 8
Ripple and Noise
Ripple and noise at full load and 8Vdc input,
5.0Vdc output and Ta=25 C
Ripple and noise at full load and 8Vdc input,
3.3Vdc output and Ta=25 C
Ripple and noise at full load and 8Vdc input,
2.5Vdc output and Ta=25 C
1F ceramic cap and 10F aluminum electrolytic cap added at the output.
Ripple and noise at full load and 8Vdc input,
1.8Vdc 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
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
Ripple and Noise
1F ceramic cap and 10F aluminum electrolytic cap added at the output.
Ripple and noise at full load and 8Vdc input,
1.5Vdc output and Ta=25 C
Ripple and noise at full load and 8Vdc input,
1.2Vdc output and Ta=25 C
Ripple and noise at full load and 8Vdc input,
1.0Vdc output and Ta=25 C
page 9
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
page 10
Transient Response
Transient response: di/dt = 0.5A/S, with external 220F Tan capacitor.
Vout=5.0V
50% to 100% load transients at 8V input and Ta=25 C
Vout=5.0V
100% to 50% load transients at 8V input and Ta=25 C
Vout=3.3V
50% to 100% load transients at 8V input and Ta=25 C
Vout=3.3V
100% to 50% load transients at 8V input and Ta=25 C
Vout=2.5V
50% to 100% load transients at 8V input and Ta=25 C
Vout=2.5V
100% to 50% load transients at 8V 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
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
page 11
Transient Response
Vout=1.5V
50% to 100% load transients at 8V input and Ta=25 C
Vout=1.8V
50% to 100% load transients at 8V input and Ta=25 C
Vout=1.8V
100% to 50% load transients at 8V input and Ta=25 C
Vout=1.5V
100% to 50% load transients at 8V input and Ta=25 C
Transient response: di/dt = 0.5A/S, with external 220F Tan capacitor.
Vout=1.2V
50% to 100% load transients at 8V input and Ta=25 C
Vout=1.2V
100% to 50% load transients at 8V 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
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
Thermal Considerations
Transient Response
Vout=1.0V
50% to 100% load transients at 8V input and Ta=25 C
Vout=1.0V
100% to 50% load transients at 8V input and Ta=25 C
Transient response: di/dt = 0.5A/S, with external 220F Tan capacitor.
page 12
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
page 13
Output Voltage Set-Point Adjustment
Vo
Trim
Gnd
Vo
Trim
Gnd
Trim Down Test Circuit
Trim Up Test Circuit
Output Voltage Set-Point Adjustment
SRDB-10E50x Trim Resistor Calculation
4.5
4.55
4.6
4.65
4.7
4.75
4.8
4.85
4.9
4.95
5
10
309
608
907
1206
1505
1804
2103
2402
2701
3000
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
_
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
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
v
a
l
u
e
,
Rt
ri
m
_
u
p
(K
o
h
m
)
Kohm
adj
Vo
Vo
down
Rtrim
)
61
.
31
,
91
.
61
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
9
.
16
,
768
.
11
(
_
-
-
=
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
2.25
2.27
2.3
2.33
2.35
2.38
2.4
2.42
2.45
2.48
2.5
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
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
_
dow
n(
K
ohm
)
2.5
2.52
2.55
2.58
2.6
2.63
2.65
2.67
2.7
2.73
2.75
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
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
)
Kohm
adj
Vo
Vo
down
Rtrim
)
43
.
14
,
568
.
7
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
10
,
544
.
3
(
_
-
-
=
2.97
3
3.04
3.07
3.1
3.13
3.17
3.2
3.23
3.27
3.3
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
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
_
dow
n(
K
ohm
)
3.3
3.33
3.37
3.4
3.43
3.46
3.5
3.53
3.56
3.6
3.63
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
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
hm
)
Kohm
adj
Vo
Vo
down
Rtrim
)
82
.
6
,
964
.
7
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
65
.
3
,
536
.
2
(
_
-
-
=
page 14
SRDB-10E33x Trim Resistor Calculation
SRDB-10E25x Trim Resistor Calculation
Output Voltage Set-Point Adjustment
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
1.35
1.37
1.38
1.4
1.41
1.43
1.44
1.46
1.47
1.49
1.5
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
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
_
dow
n(
K
ohm
)
1.5
1.51
1.53
1.54
1.56
1.58
1.59
1.61
1.62
1.64
1.65
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
v
a
l
u
e
,
Rt
ri
m
_
u
p
(K
o
h
m
)
Kohm
adj
Vo
Vo
down
Rtrim
)
71
.
11
,
716
.
2
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
87
.
7
,
072
.
3
(
_
-
-
=
1.62
1.64
1.66
1.67
1.69
1.71
1.73
1.75
1.76
1.78
1.8
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
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
_
dow
n(
K
ohm
)
1.8
1.82
1.84
1.85
1.87
1.89
1.91
1.93
1.94
1.96
1.98
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
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
)
Kohm
adj
Vo
Vo
down
Rtrim
)
84
.
13
,
869
.
3
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
10
,
072
.
3
(
_
-
-
=
page 15
SRDB-10E18x Trim Resistor Calculation
SRDB-10E15x Trim Resistor Calculation
Output Voltage Set-Point Adjustment
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
0.9
0.91
0.92
0.93
0.94
0.95
0.96
0.97
0.98
0.99
1
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
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
_
dow
n(
K
ohm
)
1
1.01
1.02
1.03
1.04
1.05
1.06
1.07
1.08
1.09
1.1
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
v
a
l
u
e
,
Rt
ri
m
_
u
p
(K
o
h
m
)
Kohm
adj
Vo
Vo
down
Rtrim
)
17
.
4
,
658
.
0
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
1
,
536
.
2
(
_
-
-
=
1.08
1.09
1.1
1.12
1.13
1.14
1.15
1.16
1.18
1.19
1.2
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
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
_
dow
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
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
v
a
l
u
e
,
Rt
ri
m
_
u
p
(K
o
h
m
)
Kohm
adj
Vo
Vo
down
Rtrim
)
48
.
8
,
562
.
1
(
_
-
-
=
Kohm
Vo
adj
Vo
up
Rtrim
)
64
.
4
,
072
.
3
(
_
-
-
=
SRDB-10E12x Trim Resistor Calculation
SRDB-10E10x Trim Resistor Calculation
Output Voltage Set-Point Adjustment
page 16
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
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05SRDB-10E
4.5V 13.2V Input / 1.0V 5.0V Output / 10A
page 17
Mechanical
Dimensions are in inches [millimeters].
Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
1.22 [30.99]
0.394 [10.01]
0.67
[17.00]
0.985 [25.02]
0.102 0.002
[2.59 0.05]
6X
0.197
[5.00]
5X
0.345 0.010
[8.76 0.25]
0.010
[0.25]
0.827 0.010
[21.01 0.25]
0.050 [1.27] 2X
0.078 [1.99] 2X
0.004 [0.10]
0- 5
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
+
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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