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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
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-08B modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal 5V
source. These converters are available in a range of output voltages from 1.2V to 3.3V. They are packaged in a compact, low
profile, surface mount DIP package for ease of layout and space savings. 8A 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 5V source is available. Typical applications include file
servers, routers, line cards and other computing and communications equipment.
Applications
page 1
SRDB-08B Series
Distributed power architectures
Data networking equipment
Telecommunications
Computers and peripherals
Part Number Selection
RoHS Compliant
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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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
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/10V, 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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
page 3
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
1. Vin = 5V, Iout = full load, Ta = 25 C.
2. 0 - 20MHz, 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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
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 without external load capacitance.
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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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
page 5
Control Specifications
General Specifications
1. Vin=5.0V, full load and Ta=25 C.
2. See graphs on pages 12-14.
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3. With remote on/off pin 8 open, the module is on.
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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
page 6
Efficiency Data
Module 3.3V
90.0%
91.0%
92.0%
93.0%
94.0%
95.0%
96.0%
97.0%
1
2
3
4
5
6
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8
4.5V
5.0V
5.5V
Module 2.5V
87.0%
88.0%
89.0%
90.0%
91.0%
92.0%
93.0%
94.0%
95.0%
1
2
3
4
5
6
7
8
4.5V
5.0V
5.5V
Module 1.8V
80.0%
82.0%
84.0%
86.0%
88.0%
90.0%
92.0%
94.0%
1
2
3
4
5
6
7
8
4.5V
5.0V
5.5V
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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
page 7
Efficiency Data
Module 1.5V
84.0%
85.0%
86.0%
87.0%
88.0%
89.0%
90.0%
91.0%
92.0%
1
2
3
4
5
6
7
8
4.5V
5.0V
5.5V
Module 1.2V
82.0%
84.0%
86.0%
88.0%
90.0%
1
2
3
4
5
6
7
8
4.5V
5.0V
5.5V
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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
page 8
Ripple and Noise
Ripple and noise at full load and 5Vdc input,
3.3Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input,
2.5Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc 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
2006 Bel Fuse Inc. Specifications subject to change without notice. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
Ripple and noise at full load and 5Vdc input,
1.5Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input,
1.2Vdc output and Ta=25 C
Ripple and Noise
page 9
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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
page 10
Transient Response
Transient response: di/dt = 0.5A/S
Vout=3. 3V
50% to 100% load transients at 5V input and Ta=25 C
Vout=3.3V
100% to 50% load transients at 5V input and Ta=25 C
Vout=2.5V
50% to 100% load transients at 5V input and Ta=25 C
Vout=2.5V
100% to 50% load transients at 5V 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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
page 11
Transient Response
Transient response: di/dt = 0.5A/S
Vout=1.5V
50% to 100% load transients at 5V input and Ta=25 C
Vout=1.5V
100% to 50% load transients at 5V input and Ta=25 C
Vout=1.8V
50% to 100% load transients at 5V input and Ta=25 C
Vout=1.8V
100% to 50% load transients at 5V 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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
page 12
Thermal Considerations
Transient Response
Transient response: di/dt = 0.5A/S
Vout=1.2V
50% to 100% load transients at 5V input and Ta=25 C
Vout=1.2V
100% to 50% load transients at 5V input and Ta=25 C
Derating Curve
Output Current (A)
Output Current vs. Local Ambient
Temperature and Air Velocity
Ambient Temperature, Ta (C)
0
60
65
30
70
75
80
85
6
8
4
2
0
Natural Convection
100LFM
200LFM
300LFM
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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
page 13
Output Voltage Set-Point Adjustment
SRDB-08B330 Trim Resistor Calculation
Vo
Trim
Gnd
Vo
Trim
Gnd
Trim Down Test Circuit
Trim Up Test Circuit
Rtrim down =
7.964
Vo Vo, adj
6.82
)
Kohm
(
Rtrim up =
2.536
Vo, adj Vo
3.65
)
Kohm
(
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
2.31 2.41
2.51 2.61 2.71
2.8
2.9
3
3.1
3.2
3.3
Adjusted Output Voltage Vo,adj (V)
T
r
im resistor v
alue Rtr
im do
wn (K
ohm)
T
r
im resistor v
alue Rtr
im up (K
ohm)
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
Adjusted Output Voltage Vo,adj (V)
3.3
3.33
3.37
3.4
3.43
3.46
3.5
3.53
3.56
3.6
3.63
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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
SRDB-08B250 Trim Resistor Calculation
Rtrim down =
3.691
Vo Vo, adj
4.12
)
Kohm
(
Rtrim up =
1.728
Vo, adj Vo
1.96
)
Kohm
(
Output Voltage Set-Point Adjustment
page 14
SRDB-08B180 Trim Resistor Calculation
Rtrim down =
1.52
Vo Vo, adj
4.12
)
Kohm
(
Rtrim up =
1.208
Vo, adj Vo
2.61
)
Kohm
(
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
1.75 1.83
1.9
1.98
2.05
2.13
2.2
2.27
2.35
2.42
2.5
Adjusted Output Voltage Vo,adj (V)
T
r
im resistor v
alue Rtr
im do
wn (K
ohm)
T
r
im resistor v
alue Rtr
im up (K
ohm)
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
Adjusted Output Voltage Vo,adj (V)
2.5
2.52
2.55
2.58
2.6
2.63
2.65 2.67
2.7
2.73
2.75
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
1.62 1.64
1.66
1.67 1.69 1.71
1.73
1.75
1.76
1.78
1.8
Adjusted Output Voltage Vo,adj (V)
T
r
im resistor v
alue Rtr
im do
wn (K
ohm)
T
r
im resistor v
alue Rtr
im up (K
ohm)
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
Adjusted Output Voltage Vo,adj (V)
1.8
1.84 1.87
1.91
1.94
1.98
2.02 2.05
2.09 2.12
2.16
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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
SRDB-08B150 Trim Resistor Calculation
Rtrim down =
0.749
Vo Vo, adj
3.21
)
Kohm
(
Rtrim up =
0.848
Vo, adj Vo
2.15
)
Kohm
(
SRDB-08B120 Trim Resistor Calculation
Rtrim down =
1.562
Vo Vo, adj
8.48
)
Kohm
(
Rtrim up =
3.064
Vo, adj Vo
4.64
)
Kohm
(
Output Voltage Set-Point Adjustment
page 15
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
1.35 1.37
1.38
1.4
1.41 1.43
1.44
1.46
1.47
1.49
1.5
Adjusted Output Voltage Vo,adj (V)
T
r
im resistor v
a
lue Rtr
i
m do
wn (K
ohm)
T
r
im resistor v
a
lue Rtr
i
m up (K
ohm)
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
Adjusted Output Voltage Vo,adj (V)
1.5
1.53
1.56
1.59
1.62
1.65
1.68 1.71
1.74
1.77
1.8
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
1.08 1.09
1.1
1.12 1.13 1.14
1.15
1.16 1.18
1.19 1.2
Adjusted Output Voltage Vo,adj (V)
T
r
im resistor v
alue Rtr
i
m do
wn (K
ohm)
T
r
im resistor v
alue Rtr
i
m up (K
ohm)
270
240
210
180
150.01
120.01
90.01
60.01
30.01
0.01
Adjusted Output Voltage Vo,adj (V)
1.2
1.21 1.22
1.24 1.25
1.26
1.27 1.28
1.3
1.31
1.32
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. 06.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06SRDB-08B
5V Input / 1.2V 3.3V Output / 8A
page 16
Mechanical
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
+
0.827
[21.00]
0.102
[2.60]
0.118 [3.00]
0.197 [5.00]
0.345
[8.75]
1.22
[31.00]
0.079
[2.00]
0.669
[17.00]
1 2 3 4 5 6
12 11 10 9 8 7
Dimensions are in inches [millimeters].
Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
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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