Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
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-03A and V7AH-03A 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 1.5V to 5.0V. They are pack-
aged in a compact, overmolded package rated at 3A. 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
12V source is available. Typical applications include file servers, routers, line cards and other computing and communications
equipment.
Applications
page 1
S7AH-03A / V7AH-03A 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
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
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
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
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.
2. 0 - 20 MHz, 0.1F ceramic cap on output.
3. Overshoot at turn on output capacitance is 100F.
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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
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
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Output Specifications
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
4. di/dt = 0.5A/1S, Ta = 25 C without external load capacitance.
page 4
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
page 5
Control Specifications
General Specifications
1. Vin=12V, full load and Ta=25 C.
2. See graphs on pages 11 - 13.
3. With remote on/off pin 1 open, the module is on.
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a
n
g
i
S
ll
A
3
.
0
-
1
V
)
n
O
t
i
n
U
(
h
g
i
H
l
a
n
g
i
S
ll
A
8
.
2
2
.
3
1
V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
page 6
Note: On/off pin designed to work with an open collector/drain switch.
Efficiency Data
Module 5.0V
60%
70%
80%
90%
100%
0.30
0.75
1.50
2.25
3.00
Output Current
E
f
f
i
ci
e
n
cy
10.8V
12.0V
13.2V
Module 3.3V
50%
60%
70%
80%
90%
100%
0.30
0.75
1.50
2.25
3.00
Output Current
E
f
f
i
c
i
enc
y
10.8V
12.0V
13.2V
Module 2.5V
50%
60%
70%
80%
90%
100%
0.30
0.75
1.50
2.25
3.00
Output Current
E
f
f
i
c
i
enc
y
10.8V
12.0V
13.2V
Module 1.8V
40%
50%
60%
70%
80%
90%
100%
1
2
3
4
5
Output Current
E
f
fi
ci
e
n
cy
10.8V
12.0V
13.2V
Module 1.5V
40%
50%
60%
70%
80%
90%
100%
0.30
0.75
1.50
2.25
3.00
Output Current
Effi
c
i
e
n
cy
10.8V
12.0V
13.2V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
page 7
Ripple and Noise
Ripple and noise at full load and 12Vdc input,
5.0Vdc output and Ta=25 C
Ripple and noise at full load and 12Vdc input,
3.3Vdc output and Ta=25 C
0.1F ceramic cap added at the output.
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
Ripple and noise at full load and 12Vdc input,
1.5Vdc 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
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
page 8
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
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
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
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
page 9
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
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
Vout=1.8V
50% to 100% load transients at 12V input and Ta=25 C
Vout=1.8V
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
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
page 10
Thermal Considerations
x7AH-03A150
x7AH-03A180
x7AH-03A500
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
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
x7AH-03A250
x7AH-03A330
Derating Curve
Output Current (A)
Output Current vs. Local Ambient
Temperature and Air Velocity
Ambient Temperature, Ta (C)
0
60
20
30
70
40
50
85
3
1
2
0
Natural Convection
200LFM
10
Derating Curve
Output Current (A)
Output Current vs. Local Ambient
Temperature and Air Velocity
Ambient Temperature, Ta (C)
0
60
20
30
70
40
50
85
3
1
2
0
Natural Convection
100LFM
200LFM
10
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
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
x7AH-03A500 Trim Resistor Calculation
Rtrim down =
23.703
Vo Vo, adj
13.87
)
Kohm
(
Rtrim up =
4.496
Vo, adj Vo
8.25
)
Kohm
(
4.5
4.55
4.6
4.65
4.7
4.75
4.8
4.85
4.9
4.95
5
0
30
60
90
120
150
180
210
240
270
300
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
)
5
5.05
5.1
5.15
5.2
5.25
5.3
5.35
5.4
5.45
5.5
0
30
60
90
120
150
180
210
240
270
300
Adjusted 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
_
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
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
page 12
x7AH-03A330 Trim Resistor Calculation
Rtrim down =
7.92
Vo Vo, adj
4.38
)
Kohm
(
Rtrim up =
2.536
Vo, adj Vo
1.21
)
Kohm
(
Output Voltage Set-Point Adjustment
x7AH-03A250 Trim Resistor Calculation
Rtrim down =
3.694
Vo Vo, adj
7.77
)
Kohm
(
Rtrim up =
1.72
Vo, adj Vo
5.62
)
Kohm
(
2.97
3
3.04
3.07
3.1
3.13
3.17
3.2
3.23
3.27
3.3
0
30
60
90
120
150
180
210
240
270
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
_do
w
n
(
K
oh
m
)
3.3
3.33
3.37
3.4
3.43
3.46
3.5
3.53
3.56
3.6
3.63
0
30
60
90
120
150
180
210
240
270
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
o
h
m
)
2.25
2.27
2.3
2.33
2.35
2.38
2.4
2.42
2.45
2.48
2.5
0
30
60
90
120
150
180
210
240
270
300
Adjusted 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
)
2.5
2.52
2.55
2.58
2.6
2.63
2.65
2.67
2.7
2.73
2.75
0
30
60
90
120
150
180
210
240
270
300
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
_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
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
page 13
x7AH-03A180 Trim Resistor Calculation
Rtrim down =
3.849
Vo Vo, adj
19.23
)
Kohm
(
Rtrim up =
3.064
Vo, adj Vo
15.4
)
Kohm
(
Output Voltage Set-Point Adjustment
x7AH-03A150 Trim Resistor Calculation
Rtrim down =
2.698
Vo Vo, adj
14.83
)
Kohm
(
Rtrim up =
3.064
Vo, adj Vo
11
)
Kohm
(
1.62
1.64
1.66
1.67
1.69
1.71
1.73
1.75
1.76
1.78
1.8
0
30
60
90
120
150
180
210
240
270
300
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
_
dow
n(
K
ohm
)
1.8
1.82
1.84
1.85
1.87
1.89
1.91
1.93
1.94
1.96
1.98
0
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj(V)
T
r
i
m
r
e
s
i
s
t
or
v
a
lu
e
,
R
t
r
i
m
_
up
(
K
oh
m
)
1.35
1.37
1.38
1.4
1.41
1.43
1.44
1.46
1.47
1.49
1.5
0
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
or va
l
u
e
R
t
ri
m
_dow
n(K
ohm
)
1.5
1.51
1.53
1.54
1.56
1.58
1.59
1.61
1.62
1.64
1.65
0
30
60
90
120
150
180
210
240
270
300
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
,
Rt
ri
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
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
page 14
Mechanical
S7AH-03A
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
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
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
2003 Bel Fuse Inc. Specifications subject to change without notice. 01.03
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP02x7AH-03A
12V Input / 1.5V 5.0V Output / 3A
page 15
Mechanical
V7AH-03A
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
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