Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V 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 S7AH-05C and V7AH-05C modules are a series of non-isolated, step down DC/DC power converters that operate
from a nominal 3.3V source. These converters are available in a range of output voltages from 1.2V to 2.5V. They are pack-
aged 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
3.3V source is available. Typical applications include file servers, routers, line cards and other computing and communications
equipment.
Applications
page 1
S7AH-05C / V7AH-05C 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
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V 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 270F/16V, ESR = 0.03
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
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V Output / 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 and 10F aluminum cap on output.
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
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V Output / 5A
page 4
Control Specifications
General Specifications
1. Vin=3.3V, 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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Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V Output / 5A
page 5
Note: On/off pin designed to work with an open collector/drain switch.
Efficiency Data
Module 2.5V
86%
88%
90%
92%
94%
96%
1
2
3
4
5
Output Current
Ef
f
i
c
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n
c
y
3.0V
3.3V
3.6V
Module 1.8V
82%
84%
86%
88%
90%
92%
94%
1
2
3
4
5
Output Current
E
f
f
i
ci
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n
cy
3.0V
3.3V
3.6V
Module 1.5V
80%
82%
84%
86%
88%
90%
92%
1
2
3
4
5
Output Current
E
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c
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3.6V
Module 1.2V
78%
79%
80%
81%
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87%
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89%
1
2
3
4
5
Output Current
E
f
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3.6V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V Output / 5A
page 6
Ripple and Noise
Ripple and noise at full load and 3.3Vdc input,
2.5Vdc output and Ta=25 C
Ripple and noise at full load and 3.3Vdc input,
1.8Vdc output and Ta=25 C
1F ceramic cap and 10F aluminum cap added at the output.
Ripple and noise at full load and 3.3Vdc input,
1.5Vdc output and Ta=25 C
Ripple and noise at full load and 3.3Vdc 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
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V Output / 5A
page 7
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=2.5V
50% to 100% load transients at 3.3V input and Ta=25 C
Vout=2.5V
100% to 50% load transients at 3.3V input and Ta=25 C
Vout=1.8V
50% to 100% load transients at 3.3V input and Ta=25 C
Vout=1.8V
100% to 50% load transients at 3.3V 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
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V Output / 5A
page 8
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=1.5V
50% to 100% load transients at 3.3V input and Ta=25 C
Vout=1.5V
100% to 50% load transients at 3.3V input and Ta=25 C
Vout=1.2V
50% to 100% load transients at 3.3V input and Ta=25 C
Vout=1.2V
100% to 50% load transients at 3.3V 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
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V Output / 5A
page 9
Thermal Considerations
V7AH-05C
S7AH-05C
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V Output / 5A
page 10
Output Voltage Set-Point Adjustment
Vo
Trim
Gnd
Vo
Trim
Gnd
Trim Down Test Circuit
Trim Up Test Circuit
Output Voltage Set-Point Adjustment
x7AH-05C250 Trim Resistor Calculation
Rtrim down =
9.5565
Vo Vo, adj
20.32
)
Kohm
(
Rtrim up =
4.496
Vo, adj Vo
14.7
)
Kohm
(
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V Output / 5A
page 11
x7AH-05C180 Trim Resistor Calculation
Rtrim down =
3.8488
Vo Vo, adj
18.54
)
Kohm
(
Rtrim up =
3.064
Vo, adj Vo
14.7
)
Kohm
(
Output Voltage Set-Point Adjustment
x7AH-05C150 Trim Resistor Calculation
Rtrim down =
2.6977
Vo Vo, adj
15.33
)
Kohm
(
Rtrim up =
3.064
Vo, adj Vo
11.5
)
Kohm
(
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V Output / 5A
page 12
x7AH-05C120 Trim Resistor Calculation
Rtrim down =
0.8501
Vo Vo, adj
6.79
)
Kohm
(
Rtrim up =
1.72
Vo, adj Vo
4.64
)
Kohm
(
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
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V Output / 5A
page 13
Mechanical
S7AH-05C
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
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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
2002 Bel Fuse Inc. Specifications subject to change without notice. 11.02
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-05C
3.3V Input / 1.2V 2.5V Output / 5A
page 14
Mechanical
V7AH-05C
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
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