NON-ISOLATED DC/DC CONVERTERS
12V Input / 0.9V – 5.0V Output / 2A
SRAH-02A / VRAH-02A Series
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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
Industrial temperature range
POWER PRODUCTS
BP05xRAH-02A
Description
The Bel SRAH-02A and VRAH-02A 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 0.9V to 5.0V. They are packaged in a
compact, overmolded package rated at 2A. 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 ranges (-40° to +85° C). The output is closely regulated and the efficiency is
typically 89% at full load. 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
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Distributed power architectures
Data networking equipment
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Telecommunications
Computers and peripherals
Part Number Selection
Output
Voltage
5.0V
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
0.9 ~ 3.63V
0.9 ~ 3.63V
Input
Voltage
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
Max. Output
Current
2A
2A
2A
2A
2A
2A
2A
2A
2A
2A
Max. Output
Power
10W
10W
6.6W
5.0W
3.6W
3.0W
2.4W
1.8W
7.3W
7.3W
Typical
Efficiency
89%
89%
88%
86%
82%
78%
74%
70%
70%
70%
Part Number
Surface Mount
SRAH-02A500
SRAH-02A50F*
SRAH-02A330
SRAH-02A250
SRAH-02A180
SRAH-02A150
SRAH-02A120
SRAH-02A090
SRAH-02A1A0
SRAH-02A1AF*
Part Number
Vertical Mount
VRAH-02A500
VRAH-02A50F*
VRAH-02A330
VRAH-02A250
VRAH-02A180
VRAH-02A150
VRAH-02A120
VRAH-02A090
VRAH-02A1A0
VRAH-02A1AF*
* F indicates fast start up.
©2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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
BP05xRAH-02A
NON-ISOLATED DC/DC CONVERTERS
12V Input / 0.9V – 5.0V Output / 2A
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
15
15
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
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
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
All
All
8.8
3
100
300
0.01
9.6
9.8
0.02
Module
All
Symbol
Vin
Iin
1.2
0.85
0.7
0.5
0.45
0.4
0.35
50
10
mA
mA
mA
rms
mApk
A
2
s
V
V
Min
10.8
Typical
Max
13.2
Units
V
A
Note: 1. Use a 47uF/25V tan capacitor at the input.
©2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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
12V Input / 0.9V – 5.0V Output / 2A
POWER PRODUCTS
BP05xRAH-02A
Output Specifications
Parameter
Output Voltage Set Point
1
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
Load Regulation
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
Line Regulation
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
Regulation Over Temperature
(-40° to 85° C)
2
2
2
1
1
1
1
5
5
5
5
5
5
5
mV
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
35
35
20
15
10
8
2
45
45
30
25
20
15
5
mV
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
52
47
30
21
16
13
6
80
80
55
40
35
30
20
15
10
8
5
5
4
3
30
30
20
10
10
10
10
mV
Module
Symbol
Vout
4.9
3.247
2.460
1.771
1.476
1.181
0.886
5.0
3.3
2.5
1.8
1.5
1.2
0.9
5.1
3.353
2.540
1.829
1.524
1.219
0.914
mV
Min
Typical
Max
Units
V
Total Output Voltage Regulation
(-40° to 85° C)
Note: All specifications are typical at nominal input, full load at 25° C unless otherwise stated.
1. Vin=12V,lout=half load,Ta=25° C.
©2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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
BP05xRAH-02A
NON-ISOLATED DC/DC CONVERTERS
12V Input / 0.9V – 5.0V Output / 2A
Output Specifications
Parameter
Output Ripple and Noise
2
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
Output Ripple and Noise
2
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
Output Current Range
Output DC Current Limit
Shor t Circuit Surge
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
0.9V
Turn on Time
0.9V - 3.63V
5.0V
Turn on Time
3
Overshoot at Turn On
Overshoot at Turn On
3
1.5V - 5.0V
0.9V - 1.2V
Output Capacitance
All
Cout
100
0
0
3
10
1000
µF
All
Ton
Ton
70
20
10
0
100
40
20
3
ms
%
%
All
All
Iout
Ioutlim
Ioutsurge
0.4
0.4
0.4
0.5
0.5
0.5
0.55
0.8
0.8
0.8
1.0
1.0
1.0
1.1
ms
0
2.5
25
20
15
15
15
10
10
35
35
25
25
25
20
20
2
6
A
A
A
2
s
60
60
50
40
35
35
35
80
80
70
60
60
60
60
mVrms
Module
Symbol
Min
Typical
Max
Units
mVp-p
Note: All specifications are typical at nominal input, full load at 25° C unless otherwise stated.
2. 0 - 20MHz BW with 100uF tan cap and 1uF ceramic cap.
3. For fast startup modules.
©2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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
12V Input / 0.9V – 5.0V Output / 2A
POWER PRODUCTS
BP05xRAH-02A
Output Specifications
Parameter
Transient Response
3
Module
Symbol
Min
Typical
Max
Units
∆
V 50% to 100% of Max Load
Settling Time
5.0V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
150
Ts
100
150
Ts
100
200
140
200
140
mV
µs
mV
µs
∆
V 50% to 100% of Max Load
Settling Time
3.3V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
120
Ts
40
120
Ts
40
150
60
150
60
mV
µs
mV
µs
∆
V 50% to 100% of Max Load
Settling Time
2.5V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
3
100
Ts
40
100
Ts
40
130
60
130
60
mV
µs
mV
µs
∆
V 50% to 100% of Max Load
Settling Time
1.8V
∆
V 100% to 50% of Max Load
Settling Time
Ts
Ts
90
40
90
40
120
60
120
60
mV
µs
mV
µs
Note: All specifications are typical at nominal input, full load at 25° C unless otherwise stated.
3. di/dt=0.1A/uS,Ta=25° C with 220uF/10V Tan cap.
©2005 Bel Fuse Inc.
Specifications subject to change without notice. 03.05
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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