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
BP05xRAH-05A
12V Input / 0.9V 5.0V 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-05A and VRAH-05A 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 0.9V to 5.0V. 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,
output voltage adjust and industrial temperature ranges (-40 to +85 C). The output is closely regulated and the efficiency is
typically 91.5% at full load. 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
SRAH-05A / VRAH-05A Series
Distributed power architectures
Data networking equipment
Telecommunications
Computers and peripherals
Part Number Selection
* F indicates fast start up.
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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
BP05xRAH-05A
12V Input / 0.9V 5.0V 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
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
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.
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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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
2. 0 - 20MHz, 22F/6.3V X5R ceramic cap on output (10F/10V X5R ceramic cap for 5.0V module).
3. For fast start up modules.
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page 4
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
page 5
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
3. di/dt = 0.5A/uS, Ta = 25 C. 0.9V ~ 3.3V modules with 220F/6.3V Tant cap (5.0V module with 100F/10V tant cap).
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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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
page 6
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
3. di/dt = 0.5A/uS, Ta = 25 C. 0.9V ~ 3.3V modules with 220F/6.3V Tant cap (5.0V module with 100F/10V tant cap).
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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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
page 7
Control Specifications
General Specifications
1. Vin=12V, full load and Ta=25 C.
2. See graphs on pages 17-25.
3. With remote on/off pin 1 open, the module is on.
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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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
page 8
Efficiency Data
MODULE 3.3V
70%
75%
80%
85%
90%
95%
0.50
1.25
2.50
3.75
5.00
OUTPUT CURRENT
E
F
F
I
CI
E
NCY
10.8
12
13.2
MODULE 2.5V
65%
70%
75%
80%
85%
90%
95%
0.50
1.25
2.50
3.75
5.00
OUTPUT CURRENT
E
F
F
I
CI
E
NCY
10.8
12
13.2
MODULE 1.8V
60%
65%
70%
75%
80%
85%
90%
0.50
1.25
2.50
3.75
5.00
OUTPUT CURRENT
EF
F
I
C
I
EN
C
Y
10.8
12
13.2
MODULE 5.0V
70%
75%
80%
85%
90%
95%
100%
0.50
1.25
2.50
3.75
5.00
OUTPUT CURRENT
E
F
F
I
CI
E
NCY
10.8
12
13.2
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
Efficiency Data
MODULE 1.2V
50%
55%
60%
65%
70%
75%
80%
85%
0.50
1.25
2.50
3.75
5.00
OUTPUT CURRENT
EF
F
I
C
I
EN
C
Y
10.8
12
13.2
MODULE 1.0V
50%
55%
60%
65%
70%
75%
80%
85%
0.50
1.25
2.50
3.75
5.00
OUTPUT CURRENT
E
F
F
I
CI
E
NCY
10.8
12
13.2
MODULE 0.9V
50%
55%
60%
65%
70%
75%
80%
85%
0.50
1.25
2.50
3.75
5.00
OUTPUT CURRENT
E
FFI
C
I
E
N
C
Y
10.8
12
13.2
page 9
MODULE 1.5V
60%
65%
70%
75%
80%
85%
90%
0.50
1.25
2.50
3.75
5.00
OUTPUT CURRENT
EF
F
I
C
I
EN
C
Y
10.8
12
13.2
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
page 10
Ripple and Noise
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
0.9V ~ 3.3V modules with 22F/6.3V X5R ceramic cap at the output.
5.0V module with 10F/10V X5R ceramic cap at the output.
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,
5.0Vdc 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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
Ripple and Noise
Ripple and noise at full load and 12Vdc input,
1.0Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input,
0.9Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input,
1.2Vdc output and Ta=25 C
page 11
Ripple and noise at full load and 12Vdc input,
1.5Vdc output and Ta=25 C
0.9V ~ 3.3V modules with 22F/6.3V X5R ceramic cap at the output.
5.0V module with 10F/10V X5R ceramic cap at the output.
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
page 12
Transient Response
Transient response: di/dt = 0.5A/S, 0.9V ~ 3.3V modules with 220F/6.3V tant cap, 5.0V module with 100F/10V tant cap.
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=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
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
page 13
Transient Response
Vout=1.8V
100% to 50% load transients at 12V input and Ta=25 C
Vout=1.8V
50% to 100% 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
Transient response: di/dt = 0.5A/S, 0.9V ~ 3.3V modules with 220F/6.3V tant cap, 5.0V module with 100F/10V tant cap.
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
page 14
Vout=1.0V
50% to 100% load transients at 12V input and Ta=25 C
Vout=1.0V
100% to 50% load transients at 12V input and Ta=25 C
Vout=1.2V
50% to 100% load transients at 12V input and Ta=25 C
Vout=1.2V
100% to 50% load transients at 12V input and Ta=25 C
Transient Response
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
Transient response: di/dt = 0.5A/S, 0.9V ~ 3.3V modules with 220F/6.3V tant cap, 5.0V module with 100F/10V tant cap.
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
xRAH-05A1A0
0.9 ~ 1.8V
Thermal Considerations
Transient Response
Vout=0.9V
50% to 100% load transients at 12V input and Ta=25 C
Vout=0.9V
100% to 50% load transients at 12V input and Ta=25 C
page 15
Transient response: di/dt = 0.5A/S, 0.9V ~ 3.3V modules with 220F/6.3V tant cap, 5.0V module with 100F/10V tant cap.
Vin = 12V
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
Thermal Considerations
xRAH-05A500
page 16
xRAH-05A1A0
2.5V ~ 3.3V
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
page 17
Output Voltage Set-Point Adjustment
xRAH-05A1A0 Trim Resistor Calculation
Rtrim up =
3.712
Vo, adj Vo
0.261
)
Kohm
(
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
2005 Bel Fuse Inc. Specifications subject to change without notice. 03.05
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
xRAH-05A090 Trim Resistor Calculation
Rtrim up =
3.712
Vo, adj Vo
40.2
)
Kohm
(
page 18
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
Output Voltage Set-Point Adjustment
xRAH-05A100 Trim Resistor Calculation
Rtrim up =
3.712
Vo, adj Vo
3.83
)
Kohm
(
Rtrim down =
0.9516
Vo, adj Vo
8.47
)
Kohm
(
page 19
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
Output Voltage Set-Point Adjustment
xRAH-05A120 Trim Resistor Calculation
Rtrim up =
3.712
Vo, adj Vo
10
)
Kohm
(
Rtrim down =
1.879
Vo, adj Vo
14.640
)
Kohm
(
page 20
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
xRAH-05A150 Trim Resistor Calculation
Rtrim up =
3.712
Vo, adj Vo
16.2
)
Kohm
(
Rtrim down =
3.273
Vo, adj Vo
20.84
)
Kohm
(
page 21
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
Output Voltage Set-Point Adjustment
xRAH-05A180 Trim Resistor Calculation
Rtrim up =
3.712
Vo, adj Vo
19.6
)
Kohm
(
Rtrim down =
4.669
Vo, adj Vo
24.24
)
Kohm
(
page 22
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
xRAH-05A250 Trim Resistor Calculation
Rtrim up =
3.712
Vo, adj Vo
13.3
)
Kohm
(
Rtrim down =
7.912
Vo, adj Vo
17.94
)
Kohm
(
Output Voltage Set-Point Adjustment
page 23
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
Output Voltage Set-Point Adjustment
xRAH-05A330 Trim Resistor Calculation
Rtrim up =
3.712
Vo, adj Vo
10
)
Kohm
(
Rtrim down =
11.614
Vo, adj Vo
14.64
)
Kohm
(
page 24
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
Output Voltage Set-Point Adjustment
xRAH-05A500 Trim Resistor Calculation
Rtrim up =
3.712
Vo, adj Vo
6.19
)
Kohm
(
Rtrim down =
19.4618
Vo, adj Vo
10.83
)
Kohm
(
page 25
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
Mechanical
page 26
SRAH-05A
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.
1 2 3 4 5
6
7
n
i
P
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o
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c
n
u
F
1
f
f
O
/
n
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e
t
o
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e
R
2
n
i
V
+
3
d
n
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G
4
o
V
+
5
m
i
r
T
6
n
o
i
t
c
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n
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C
o
N
7
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C
o
N
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
BP05xRAH-05A
12V Input / 0.9V 5.0V Output / 5A
Mechanical
page 27
VRAH-05A
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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