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
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
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
Description
The Bel SRAH-05B and VRAH-05B 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, overmolded package rated at 5A. Optional lead forming provides a vertical mount product for minimal footprint
or a surface mount option for a very low profile. Standard features include remote on/off, over current and short circuit
protection, 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
SRAH-05B / VRAH-05B 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
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
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 one 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
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
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. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
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. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
page 5
Control Specifications
General Specifications
1. Vin=5V, full load and Ta=25 C.
2. See graphs on pages 10-12.
3. With remote on/off pin 1 open, the module is on.
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i
n
U
(
h
g
i
H
l
a
n
g
i
S
ll
A
8
.
2
5
.
5
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
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
page 6
Efficiency Data
Module 3.3V
92%
93%
94%
95%
96%
97%
1
2
3
4
5
6
Output Current
E
f
f
i
c
i
enc
y
4.5V
5.0V
5.5V
Module 2.5V
90%
91%
92%
93%
94%
95%
1
2
3
4
5
6
Output Current
E
f
f
i
c
i
enc
y
4.5V
5.0V
5.5V
Module 1.8V
86%
87%
88%
89%
90%
91%
92%
93%
1
2
3
4
5
6
Output Current
E
ffi
ci
e
n
c
y
4.5V
5.0V
5.5V
Module 1.5V
85%
86%
87%
88%
89%
90%
91%
92%
1
2
3
4
5
6
Output Current
E
f
f
i
ci
e
n
cy
4.5V
5.0V
5.5V
Module 1.2V
81%
82%
83%
84%
85%
86%
87%
88%
1
2
3
4
5
6
Output Current
Ef
fi
ci
e
n
cy
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. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
page 7
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
1F ceramic cap and 10F aluminum electrolytic cap added at the output.
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
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
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
page 8
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
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
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. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
page 9
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=1.2V
50% to 100% load transients at 5V input and Ta=25 C
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=1.2V
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. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
page 10
Thermal Considerations
VRAH-05B
SRAH-05B
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
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
page 11
Output Voltage Set-Point Adjustment
Vo
Trim
Gnd
Vo
Trim
Gnd
Trim Down Test Circuit
Trim Up Test Circuit
Output Voltage Set-Point Adjustment
xRAH-05B330 Trim Resistor Calculation
Rtrim down =
7.914
Vo Vo, adj
8.27
)
Kohm
(
Rtrim up =
2.528
Vo, adj Vo
5.11
)
Kohm
(
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
re
s
i
s
t
o
r
v
a
l
u
e
R
t
ri
m
_
d
o
w
n
(K
o
h
m
)
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
_
u
p
(
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
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
page 12
xRAH-05B250 Trim Resistor Calculation
Rtrim down =
3.664
Vo Vo, adj
6.79
)
Kohm
(
Rtrim up =
1.72
Vo, adj Vo
4.64
)
Kohm
(
xRAH-05B180 Trim Resistor Calculation
Rtrim down =
1.509
Vo Vo, adj
5.52
)
Kohm
(
Rtrim up =
1.2
Vo, adj Vo
4.02
)
Kohm
(
Output Voltage Set-Point Adjustment
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
si
sto
r
v
a
l
u
e
Rt
r
i
m
_
d
o
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
0.01
30.01
60.01
90.01
120.01
150.01
180
210
240
270
Adjusted output voltage Vo,adj(V)
Tr
i
m
r
e
s
i
s
t
or
v
a
l
u
e
,
R
t
r
i
m
_
up(
K
o
h
m
)
1.62 1.64 1.66 1.67 1.69
1.71 1.73 1.75 1.76 1.78
1.8
1
30.9
60.8
90.7
120.6
150.5
180.4
210.3
240.2
270.1
300
Adjusted output voltage Vo,adj (V)
T
r
i
m
r
e
s
i
s
t
or
v
a
l
u
e
R
t
r
i
m
_
dow
n
(
K
o
hm
)
1.8
1.82
1.83
1.85
1.86
1.88
1.9
1.91
1.93
1.94 1.96
1
30.9
60.8
90.7
120.6
150.5
180.4
210.3
240.2
270.1
300
Adjusted output voltage Vo,adj(V)
T
r
i
m
r
e
s
i
s
t
or
v
a
l
u
e
,
R
t
r
i
m
_
up(
K
ohm
)
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
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
page 13
xRAH-05B150 Trim Resistor Calculation
Rtrim down =
2.702
Vo Vo, adj
11.7
)
Kohm
(
Rtrim up =
3.064
Vo, adj Vo
7.87
)
Kohm
(
xRAH-05B120 Trim Resistor Calculation
Rtrim down =
1.545
Vo Vo, adj
8.47
)
Kohm
(
Rtrim up =
3.064
Vo, adj Vo
4.64
)
Kohm
(
Output Voltage Set-Point Adjustment
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
A djusted 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
oh
m
)
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
A djus ted output voltage V o,adj(V)
T
r
i
m
r
e
s
i
s
t
or
va
l
u
e
,
R
t
r
i
m
_
u
p
(
K
oh
m
)
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
si
st
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
r
e
si
st
or
va
l
u
e
,
R
t
r
i
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
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
Mechanical
page 14
SRAH-05B
0.400
[10.16]
0.60
[15.24]
0.70
[17.78]
0.050
[1.27]
0.100
[2.54]
4x
0.400
[10.16]
0.012
[0.30]
0.050
[1.27]
0.020
[0.51]
0.320
[8.13]
0.780
[19.81]
0.055 [1.40] 2x
0.090 [2.29] 2x
0.004 [0.10]
0-5
R0.015
[R0.38] typ
R0.008
[R0.20] typ
0.100 [2.54]
0.855
[21.72]
0.065 [1.65]
0.110
[2.79]
Suggested PCB Pad Layout
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
f
f
O
/
n
O
e
t
o
m
e
R
2
n
i
V
+
3
d
n
u
o
r
G
4
o
V
+
5
m
i
r
T
6
n
o
i
t
c
e
n
n
o
C
o
N
7
n
o
i
t
c
e
n
n
o
C
o
N
1 2 3 4 5
6
7
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
BP06xRAH-05B
5V Input / 1.2V 3.3V Output / 5A
Mechanical
page 15
VRAH-05B
0.700
[17.78]
0.600
[15.24]
0.050
[1.27]
0.265
[6.73]
min
0.020
[0.51]
0.308
[7.82]
0.050 [1.27]
0.100 [2.54]
0.400 [10.16]
Dimensions are in inches [millimeters].
Standard dimension tolerance is 0.005 [0.13] unless otherwise noted.
2
4
3
5
1
n
i
P
n
o
i
t
c
n
u
F
1
f
f
O
/
n
O
e
t
o
m
e
R
2
n
i
V
+
3
d
n
u
o
r
G
4
o
V
+
5
m
i
r
T
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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