Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
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-08B and V7AH-08B 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 0.9V to 3.3V. They are packaged
in a compact, overmolded package rated at 8A. 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 range (-40 to +85 C). The output is closely regulated and the
efficiency is typically 92% at full load. 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
S7AH-08B / V7AH-08B 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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
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/S, Ta = 25 C without external load capacitance; when Vout=3.3V or 2.5V a 220F aluminum cap is added at
output.
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9
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s
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
page 5
Note: On/off pin designed to work with an open collector/drain switch.
Control Specifications
General Specifications
1. Vin=5V, full load and Ta=25 C.
2. See graphs on page 13 - 20.
1. With remote on/off pin 1 open, the module is on.
2. Signal low and signal high varies based on Vin.
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4
g
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
page 6
Efficiency Data
MODULE 3.3V
88%
89%
90%
91%
92%
93%
94%
95%
96%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
OUTPUT CURRENT
E
F
F
I
CI
E
NCY
4.5V
5.0V
5.5V
MODULE 2.5V
86%
87%
88%
89%
90%
91%
92%
93%
94%
95%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
OUTPUT CURRENT
E
F
F
I
CI
E
NCY
4.5V
5.0V
5.5V
MODULE 1.8V
83%
85%
87%
89%
91%
93%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
OUTPUT CURRENT
E
F
F
I
CI
E
NCY
4.5V
5.0V
5.5V
MODULE 1.5V
80%
82%
84%
86%
88%
90%
92%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
OUTPUT CURRENT
E
F
F
I
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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
Efficiency Data
page 7
MODULE 1.2V
78%
80%
82%
84%
86%
88%
90%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
OUTPUT CURRENT
EFF
I
C
I
EN
C
Y
4.5v
5.0v
5.5v
MODULE 1.0V
76%
78%
80%
82%
84%
86%
88%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
OUTPUT CURRENT
E
FFI
C
I
E
N
C
Y
4.5V
5.0V
5.5V
MODULE 0.9V
76%
78%
80%
82%
84%
86%
88%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
OUTPUT CURRENT
E
F
F
I
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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
page 8
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
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
Ripple and Noise
Ripple and noise at full load and 5Vdc input,
1.0Vdc output and Ta=25 C
Ripple and noise at full load and 5Vdc input,
0.9Vdc 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,
1.2Vdc output and Ta=25 C
page 9
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
page 10
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance.
Note: 3.3Vdc and 2.5Vdc output with external 220uF aluminum 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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
page 11
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
Vout=1.0V
50% to 100% load transients at 5V input and Ta=25 C
Vout=1.0V
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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
page 12
Thermal Considerations
V7AH-08B
S7AH-08B
Transient Response
Transient response: di/dt = 0.5A/S, no external load capacitance
Vout=0.9V
50% to 100% load transients at 5V input and Ta=25 C
Vout=0.9V
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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
page 13
Output Voltage Set-Point Adjustment
Vo
Trim
Gnd
Vo
Trim
Gnd
Trim Down Test Circuit
Trim Up Test Circuit
x7AH-08B1A0 Trim Resistor Calculation
0.85
0.94
1.04
1.14
1.23
1.33
1.42
1.52
1.61
1.71
1.8
0
300
600
900
1200
1500
1800
2100
2400
2700
3000
A djus ted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
R
t
ri
m
_
dow
n(O
h
m
)
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
0
300
600
900
1200
1500
1800
2100
2400
2700
3000
A djus ted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
,
R
t
ri
m
_
up(O
hm
)
ohm
adj
Vo
Vo
R
down
trim
)
1
.
261
,
362
.
250
(
-
-
=
-
ohm
Vo
adj
Vo
R
up
trim
)
1
.
12
,
2
.
199
(
-
-
=
-
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.805V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.805V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
x7AH-08B330 Trim Resistor Calculation
page 14
2.8
2.85
2.9
2.95
3
3.05
3.1
3.15
3.2
3.25
3.3
500
2000
3500
5000
6500
8000
9500
1.1 .10
4
1.25 .10
4
1.4 .10
4
1.55 .10
4
A djus ted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
R
t
ri
m
_
dow
n(O
h
m
)
3.3
3.35
3.4
3.45
3.5
3.55
3.6
3.65
3.7
3.75
3.8
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
1 .10
4
Adjusted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
,
R
t
ri
m
_
up(O
hm
)
ohm
adj
Vo
Vo
R
down
trim
)
651
,
741
.
623
(
-
-
=
-
ohm
Vo
adj
Vo
R
up
trim
)
402
,
2
.
199
(
-
-
=
-
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=3.305V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=3.305V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
x7AH-08B250 Trim Resistor Calculation
page 15
2.1
2.14
2.18
2.22
2.26
2.3
2.34
2.38
2.42
2.46
2.5
0
1500
3000
4500
6000
7500
9000
1.05 .10
4
1.2 .10
4
1.35 .10
4
1.5 .10
4
A djus ted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
R
t
ri
m
_
dow
n(O
h
m
)
2.5
2.54
2.58
2.62
2.66
2.7
2.74
2.78
2.82
2.86
2.9
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
1 .10
4
A djus ted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
,
R
t
ri
m
_
up(O
hm
)
ohm
adj
Vo
Vo
R
down
trim
)
760
,
933
.
423
(
-
-
=
-
ohm
Vo
adj
Vo
R
up
trim
)
511
,
2
.
199
(
-
-
=
-
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.503V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=2.503V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
x7AH-08B180 Trim Resistor Calculation
page 16
1.5
1.53
1.56
1.59
1.62
1.65
1.68
1.71
1.74
1.77
1.8
0
1500
3000
4500
6000
7500
9000
1.05 .10
4
1.2 .10
4
1.35 .10
4
1.5 .10
4
A djus ted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
R
t
ri
m
_
dow
n(O
h
m
)
1.8
1.83
1.86
1.89
1.92
1.95
1.98
2.01
2.04
2.07
2.1
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
1 .10
4
A djus ted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
,
R
t
ri
m
_
up(O
hm
)
ohm
adj
Vo
Vo
R
down
trim
)
760
,
362
.
250
(
-
-
=
-
ohm
Vo
adj
Vo
R
up
trim
)
511
,
2
.
199
(
-
-
=
-
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.805V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.805V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
where,
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
x7AH-08B150 Trim Resistor Calculation
page 17
1.35 1.37 1.38 1.4
1.41 1.43 1.44 1.46 1.47 1.49
1.5
0
1500
3000
4500
6000
7500
9000
1.05.10
4
1.2.10
4
1.35.10
4
1.5.10
4
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
)
1.5
1.51 1.53 1.54 1.56 1.58 1.59 1.61 1.62 1.64 1.65
0
1500
3000
4500
6000
7500
9000
1.05.10
4
1.2.10
4
1.35.10
4
1.5.10
4
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
hm
)
ohm
adj
Vo
Vo
R
down
trim
)
522
,
255
.
122
(
-
-
=
-
ohm
Vo
adj
Vo
R
up
trim
)
348
,
2
.
139
(
-
-
=
-
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.503V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.503V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
where,
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
x7AH-08B120 Trim Resistor Calculation
page 18
1
1.02
1.04
1.06
1.08
1.1
1.12
1.14
1.16
1.18
1.2
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
A djus ted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
R
t
ri
m
_dow
n(O
hm
)
1.2
1.22
1.24
1.26
1.28
1.3
1.32
1.34
1.36
1.38
1.4
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
1 .10
4
A djus ted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
,
R
t
ri
m
_up(
O
h
m
)
where,
ohm
adj
Vo
Vo
R
down
trim
)
200
,
38
.
40
(
-
-
=
-
ohm
Vo
adj
Vo
R
up
trim
)
100
,
80
(
-
-
=
-
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.204V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.204V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
x7AH-08B100 Trim Resistor Calculation
page 19
0.85
0.86
0.88
0.9
0.91
0.93
0.94
0.95
0.97
0.98
1
0
100
200
300
400
500
600
700
800
900
1000
A djus ted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
R
t
ri
m
_dow
n(O
hm
)
1
1.02
1.04
1.06
1.08
1.1
1.12
1.14
1.16
1.18
1.2
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
1 .10
4
A djus ted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
,
R
t
ri
m
_up(
O
h
m
)
ohm
adj
Vo
Vo
R
down
trim
)
2
.
63
,
544
.
10
(
-
-
=
-
ohm
Vo
adj
Vo
R
up
trim
)
1
.
12
,
88
.
40
(
-
-
=
-
where,
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.006V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=1.006V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
x7AH-08B090 Trim Resistor Calculation
page 20
0.85 0.855 0.86
0.865 0.87
0.875 0.88
0.885 0.89
0.895
0.9
0
40
80
120
160
200
240
280
320
360
400
A djus ted output voltage Vo,adj (V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
R
t
ri
m
_dow
n(O
hm
)
0.9
0.91
0.92
0.93
0.94
0.95
0.96
0.97
0.98
0.99
1
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
1 .10
4
A djus ted output voltage Vo,adj(V)
T
r
i
m
re
s
i
s
t
o
r
va
l
u
e
,
R
t
ri
m
_up(
O
h
m
)
ohm
adj
Vo
Vo
R
down
trim
)
2
.
38
,
751
.
2
(
-
-
=
-
ohm
Vo
adj
Vo
R
up
trim
)
1
.
12
,
88
.
20
(
-
-
=
-
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=0.905V
Vo,adj is the adjusted output voltage.
Rtrim-down is the resistance required between TRIM and Vo.
Vo is the nominal output voltage setpoint when trim pin is open ,Vo=0.905V
Vo,adj is the adjusted output voltage.
Rtrim-up is the resistance required between TRIM and GND.
where,
where,
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
Mechanical
page 21
S7AH-08B
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
2004 Bel Fuse Inc. Specifications subject to change without notice. 03.04
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP03x7AH-08B
5V Input / 0.9V 3.3V Output / 8A
Mechanical
page 22
V7AH-08B
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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