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-02C
3.3V Input / 5V Output / 1.5A
Nonisolated
Compact, low profile surface mount package
Fixed frequency*
High efficiency means less power dissipation
Excellent thermal performance
Optimized for cost
Allows burst mode operation at low load currents
Description
The Bel SRAH-02C and VRAH-02C modules are non-isolated, step up DC/DC power converters that operate from a nominal
3.3V source with an output voltage of 5V. They are packaged in a compact, overmolded package rated at 1.5A. Optional lead
forming provides a vertical mount product for minimal footprint or a surface mount option for a very low profile. Standard
features include output voltage adjust and industrial temperature range (-40 to +85 C). The output is closely regulated and
the efficiency is typically 87% at full load. These products may be used almost anywhere low voltage silicon is employed and a
3.3V source is available. Typical applications include file servers, routers, line cards and other computing and communications
equipment.
*Optional Burst/skip mode operating at light load or no load.
Applications
page 1
SRAH-02C / VRAH-02C Modules
Distributed power architectures
Data networking equipment
Telecommunications
Computers and peripherals
Part Number Selection
Options
Trim function
Note: For parts with Burst/skip mode disabled, change the last character to a B (e.g. SRAH-02C50B).
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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-02C
3.3V Input / 5V Output / 1.5A
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-02C
3.3V Input / 5V Output / 1.5A
page 3
Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
1. Vin = 3.3V, Iout = full load, Ta = 25 C.
2. 0 - 20MHz, 1F ceramic cap on output.
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General Specifications
1. Vin=3.3V, full load and Ta=25 C.
2. See graphs on page 6.
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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-02C
3.3V Input / 5V Output / 1.5A
page 4
Efficiency Data
Ripple and Noise
Ripple and noise at full load and 3.3Vdc input,
5Vdc output and Ta=25 C
1F ceramic cap at the output.
Ripple and noise when operating in burst mode at no
load and 3.3Vdc input, 5Vdc output and Ta=25 C
Module 5.0V
82%
83%
84%
85%
86%
87%
88%
89%
0.150
0.375
0.750
1.125
1.500
Output current (A)
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3.0V
3.3V
3.6V
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-02C
3.3V Input / 5V Output / 1.5A
page 5
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=5V
50% to 100% load transients at 3.3V input and Ta=25 C
Vout=5V
100% to 50% load transients at 3.3V input and Ta=25 C
Thermal Considerations
xRAH-02C
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-02C
3.3V Input / 5V Output / 1.5A
page 6
Output Voltage Set-Point Adjustment
xRAH-02C Trim Resistor Calculation
Rtrim up =
8.4
Vo, adj Vo
2
)
Kohm
(
Rtrim down =
44.144
Vo Vo, adj
12.5
)
Kohm
(
Vout
Trim
Gnd
Vout
Trim
Gnd
Trim Down Circuit
Trim Up Circuit
Module
Rtrim Up
Rtrim Down
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-02C
3.3V Input / 5V Output / 1.5A
page 7
Mechanical
SRAH-02C
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
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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-02C
3.3V Input / 5V Output / 1.5A
page 8
Mechanical
VRAH-02C
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
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N
2
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V
+
3
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G
4
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+
5
m
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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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