NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
SRAH-08B / VRAH-08B Series
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•
•
•
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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
POWER PRODUCTS
BP06xRAH-08B
RoHS Compliant
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
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Distributed power architectures
Data networking equipment
Telecommunications
Computers and peripherals
Part Number Selection
Output
Voltage
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
0.9V - 3.3V
Input
Voltage
5V
5V
5V
5V
5V
5V
5V
5V
Max. Output
Current
8A
8A
8A
8A
8A
8A
8A
8A
Max. Output
Power
26.4W
20W
14.4W
12W
9.6W
8W
7.2W
26.4W
Typical
Efficiency
92%
90%
86%
84%
82%
80%
79%
92%
Part Number
Surface Mount
SRAH-08B330
SRAH-08B250
SRAH-08B180
SRAH-08B150
SRAH-08B120
SRAH-08B100
SRAH-08B090
SRAH-08B1A0
Part Number
Vertical Mount
VRAH-08B330
VRAH-08B250
VRAH-08B180
VRAH-08B150
VRAH-08B120
VRAH-08B100
VRAH-08B090
VVAH-08B1A0
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 1
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
Absolute Maximum Ratings
Parameter
Continuous Input Voltage
Output Enable Terminal Voltage
Ambient Temperature
Storage Temperature
Symbol
Vin
Vouten
Tamb
Tstor
Min
-0.3
-0.3
-40
-55
Typical
Max
6
6
85
125
Unit
V
V
°C
°C
Note: Use beyond the maximum ratings may cause a reliability degradation of the DC/DC
converter or may permanently damage the device.
Input Specifications
Parameter
Operating Input Voltage
Input Current
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
No Load Input Current
Remote Off Input Current
Input Reflected Ripple Current
1
Input Reflected Ripple Current (P-P)
1
I
2
t Inrush Current Transient
Turn On Voltage Threshold
Turn Off Voltage Threshold
All
All
All
All
All
4.19
All
9
50
150
0.02
4.3
3.8
Module
All
Symbol
Vin
Iin
7.3
5.6
4.3
3.6
3.0
2.5
2.3
80
15
80
200
0.05
4.5
4.49
mA
mA
mA
rms
mApk
A
2
s
V
V
Min
4.5
Typical
Max
5.5
Units
V
A
Note: Input capacitance one 270µF/16V, ESR = 0.018
Ω
max at 100kHz @ 25° C.
1. With simulated source impedance of 500nH, 5Hz to 20MHz.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 2
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
Output Specifications
Parameter
Output Voltage Set Point
1
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
Load Regulation
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
Line Regulation
Regulation Over Temperature
(-40° to +85° C)
All
6
6
6
3
3
3
3
2
15
15
15
10
10
10
10
5
mV
mV
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
20
20
10
10
5
5
5
33
25
18
15
10
10
10
mV
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
Output Ripple and Noise
2
Output Ripple and Noise
2
Output Current Range
Output DC Current Limit
Shor t Circuit Surge
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
Turn on Time
Overshoot at Turn On
Output Capacitance
All
All
All
Cout
0
Ton
All
All
All
All
Iout
Ioutlim
Ioutsurge
0.08
0.05
0.05
0.05
0.05
0.05
0.05
12
0
0.2
0.1
0.1
0.1
0.1
0.1
0.1
20
3
3300
ms
%
µF
0
10.4
28
28
18
15
10
10
10
50
15
53
45
38
30
25
25
25
100
25
8
20
mVp-p
mVrms
A
A
A
2
s
Module
Symbol
Vout
3.234
2.45
1.764
1.47
1.176
0.98
0.882
3.3
2.5
1.8
1.5
1.2
1.0
0.9
3.366
2.55
1.836
1.53
1.224
1.02
0.918
mV
Min
Typical
Max
Units
V
POWER PRODUCTS
BP06xRAH-08B
Total Output Voltage Regulation
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, 1µF ceramic cap and 10µF aluminum cap on output.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 3
POWER PRODUCTS
BP06xRAH-08B
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
Output Specifications
Parameter
Transient Response
3
∆
V 50% to 100% of Max Load
Settling Time
3.3V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
∆
V 50% to 100% of Max Load
Settling Time
2.5V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
∆
V 50% to 100% of Max Load
Settling Time
1.8V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
∆
V 50% to 100% of Max Load
Settling Time
1.5V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
∆
V 50% to 100% of Max Load
Settling Time
1.2V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
∆
V 50% to 100% of Max Load
Settling Time
1.0V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
∆
V 50% to 100% of Max Load
Settling Time
0.9V
∆
V 100% to 50% of Max Load
Settling Time
Ts
70
25
110
50
mV
µs
Ts
70
25
110
50
mV
µs
Ts
70
25
110
50
mV
µs
Ts
70
25
110
50
mV
µs
Ts
90
25
125
50
mV
µs
Ts
90
25
125
50
mV
µs
Ts
100
25
150
50
mV
µs
Ts
100
25
150
50
mV
µs
Ts
120
25
165
50
mV
µs
Ts
120
25
165
50
mV
µs
Ts
120
30
165
60
mV
µs
Ts
130
30
165
60
mV
µs
Ts
130
100
165
150
mV
µs
Ts
130
100
165
150
mV
µs
Module
Symbol
Min
Typical
Max
Units
Note: All specifications are typical at nominal input, full load at 25° C unless otherwise stated.
3. di/dt = 0.5A/µS, Ta = 25° C without external load capacitance; when Vout=3.3V or 2.5V a 220µF aluminum cap is added at
output.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 4
NON-ISOLATED DC/DC CONVERTERS
5V Input / 0.9V – 3.3V Output / 8A
POWER PRODUCTS
BP06xRAH-08B
General Specifications
Parameter
Efficiency
1
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
Switching Frequency
Output Voltage Trim Range
2
(Wide Trim)
Output Voltage Trim Range
2
(Narrow Trim)
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
Weight
All
90
90
90
90
90
90
95
4.7
110
110
110
110
110
110
110
g
All
1.8V
Fsw
Module
Symbol
η
89
87
83
81
79
77
76
250
47.5
92
90
86
84
82
80
79
300
340
202
kHz
%
%
Min
Typical
Max
Units
%
1. Vin=5V, full load and Ta=25° C.
2. See graphs on page 13 - 20.
Control Specifications
Parameter
Remote On/Off
1
Module
All
Vin = 4.5V
Symbol
Vouten
Min
Typical
Max
Units
V
1.35
All
-0.3
1.65
3.15
All
5.5
3.85
V
V
Signal Low (Unit Off)
2
Vin = 5.5V
Vin = 4.5V
Signal High (Unit On)
2
Vin = 5.5V
1. With remote on/off pin 1 open, the module is on.
2. Signal low and signal high varies based on Vin.
Note: On/off pin designed to work with an open collector/drain switch.
©2006 Bel Fuse Inc.
Specifications subject to change without notice. 02.06
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
page 5
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