NON-ISOLATED DC/DC CONVERTERS
12V Input / 1.5V – 5.0V Output / 3A
SRAH-03A / VRAH-03A 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
POWER PRODUCTS
BP05xRAH-03A
RoHS Compliant
Description
The Bel SRAH-03A and VRAH-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
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Distributed power architectures
Data networking equipment
Telecommunications
Computers and peripherals
Part Number Selection
Output
Voltage
5.0V
3.3V
2.5V
1.8V
1.5V
Input
Voltage
12V
12V
12V
12V
12V
Max. Output
Current
3A
3A
3A
3A
3A
Max. Output
Power
15W
9.9W
7.5W
5.4W
4.5W
Typical
Efficiency
91%
90%
88%
85%
84%
Part Number
Surface Mount
SRAH-03A500
SRAH-03A330
SRAH-03A250
SRAH-03A180
SRAH-03A150
Part Number
Vertical Mount
VRAH-03A500
VRAH-03A330
VRAH-03A250
VRAH-03A180
VRAH-03A150
©2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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-03A
NON-ISOLATED DC/DC CONVERTERS
12V Input / 1.5V – 5.0V Output / 3A
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
-40
Typical
Max
13.2
13.2
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
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
8.0
All
3
30
140
0.005
9.4
9.0
10.0
0.01
Module
All
Symbol
Vin
Iin
1.7
1.2
0.9
0.75
0.6
100
10
mA
mA
mA
rms
mApk
A
2
s
V
V
Min
10.8
Typical
Max
13.2
Units
V
A
Note: Input capacitance 270µF/16V, ESR = 0.03
Ω
max at 100kHz @ 25° C.
1. With simulated source impedance of 500nH, 5Hz to 20MHz.
©2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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 / 1.5V – 5.0V Output / 3A
Output Specifications
Parameter
Output Voltage Set Point
1
5.0V
3.3V
2.5V
1.8V
1.5V
Load Regulation
5.0V
3.3V
2.5V
1.8V
1.5V
Line Regulation
5.0V
3.3V
2.5V
1.8V
1.5V
Regulation Over Temperature
5.0V
3.3V
2.5V
1.8V
1.5V
Total Output Voltage Regulation
5.0V
3.3V
2.5V
1.8V
1.5V
Output Ripple and Noise
2
Output Ripple and Noise
2
Output Current Range
Output DC Current Limit
Shor t Circuit Surge
Turn on Time
Overshoot at Turn On
3
Output Capacitance
All
All
All
All
All
All
All
All
Cout
0
Iout
Ioutlim
Ioutsurge
Ton
0
3.6
0.35
12
0
40
27
16
13
13
40
10
62.5
51.5
35
25
25
100
20
3
7.5
0.7
20
3
1200
20
12
8
5
5
30
25
20
10
10
10
5
3
3
3
16
10
5
5
5
10
10
5
5
5
16.5
16.5
10
10
10
Module
Symbol
Vout
4.920
3.247
2.460
1.771
1.476
5.0
3.3
2.5
1.8
1.5
5.080
3.353
2.540
1.829
1.524
Min
Typical
Max
POWER PRODUCTS
BP05xRAH-03A
Units
V
mV
mV
mV
mV
mVp-p
mVrms
A
A
A
2
s
ms
%
µF
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, 0.1µF ceramic cap on output.
3. Overshoot at turn on output capacitance is 100µF.
©2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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-03A
NON-ISOLATED DC/DC CONVERTERS
12V Input / 1.5V – 5.0V Output / 3A
Output Specifications
Parameter
Transient Response
4
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
4
100
Ts
40
100
Ts
40
200
80
200
80
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
4
80
Ts
40
80
Ts
40
150
80
150
80
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
4
70
Ts
40
70
Ts
40
100
80
100
80
mV
µs
mV
µs
∆
V 50% to 100% of Max Load
Settling Time
1.8V
∆
V 100% to 50% of Max Load
Settling Time
Transient Response
4
70
Ts
40
70
Ts
40
100
80
100
80
mV
µs
mV
µs
∆
V 50% to 100% of Max Load
Settling Time
1.5V
∆
V 100% to 50% of Max Load
Settling Time
Ts
Ts
70
40
70
40
100
80
100
80
mV
µs
mV
µs
Note: All specifications are typical at nominal input, full load at 25° C unless otherwise stated.
4. di/dt = 0.5A/1µS, Ta = 25° C without external load capacitance.
©2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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 / 1.5V – 5.0V Output / 3A
POWER PRODUCTS
BP05xRAH-03A
General Specifications
Parameter
Efficiency
1
5.0V
3.3V
2.5V
1.8V
1.5V
Switching Frequency
5.0V
3.3V
2.5V
1.8V
1.5V
Output Voltage Trim Range
2
Weight
All
All
Fsw
470
340
270
270
270
90
4.9
500
370
300
300
300
530
400
330
330
330
110
%
g
Module
Symbol
η
89
88
86
83
82
91
90
88
85
84
kHz
Min
Typical
Max
Units
%
1. Vin=12V, full load and Ta=25° C.
2. See graphs on pages 11 - 13.
Control Specifications
Parameter
Remote On/Off
3
Signal Low (Unit Off)
Signal High (Unit On)
Module
All
All
All
Symbol
Vouten
-0.3
2.8
1
13.2
Min
Typical
Max
Units
V
V
V
3. With remote on/off pin 1 open, the module is on.
©2005 Bel Fuse Inc.
Specifications subject to change without notice. 07.05
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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