Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-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 SRAH-08B and VRAH-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
SRAH-08B / VRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-08B
5V Input / 0.9V 3.3V Output / 8A
page 12
Thermal Considerations
VRAH-08B
SRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-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
xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-08B
5V Input / 0.9V 3.3V Output / 8A
Output Voltage Set-Point Adjustment
xRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-08B
5V Input / 0.9V 3.3V Output / 8A
Mechanical
page 21
SRAH-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
2006 Bel Fuse Inc. Specifications subject to change without notice. 02.06
POWER PRODUCTS
NON-ISOLATED DC/DC CONVERTERS
BP06xRAH-08B
5V Input / 0.9V 3.3V Output / 8A
Mechanical
page 22
VRAH-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
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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