NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V – 2.5V Output / 5A
SRAH-05C / VRAH-05C 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-05C
Description
The Bel SRAH-05C and VRAH-05C modules are a series of non-isolated, step down DC/DC power converters that operate
from a nominal 3.3V source. These converters are available in a range of output voltages from 1.2V to 2.5V. They are pack-
aged in a compact, overmolded package rated at 5A. 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
3.3V 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
2.5V
1.8V
1.5V
1.2V
Input
Voltage
3.3V
3.3V
3.3V
3.3V
Max. Output
Current
5A
5A
5A
5A
Max. Output
Power
12.5W
9.0W
7.5W
6W
Typical
Efficiency
91%
88%
86%
83%
Part Number
Surface Mount
SRAH-05C250
SRAH-05C180
SRAH-05C150
SRAH-05C120
Part Number
Vertical Mount
VRAH-05C250
VRAH-05C180
VRAH-05C150
VRAH-05C120
©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-05C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V – 2.5V Output / 5A
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
6
6
85
105
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
2.5V
1.8V
1.5V
1.2V
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
2.6
2.5
All
3
30
100
0.0005
Module
All
Symbol
Vin
Iin
4.8
4.0
3.5
3.0
90
10
45
150
0.001
2.7
mA
mA
mA
rms
mApk
A
2
s
V
V
Min
3
Typical
Max
3.6
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. 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
3.3V Input / 1.2V – 2.5V Output / 5A
POWER PRODUCTS
BP05xRAH-05C
Output Specifications
Parameter
Output Voltage Set Point
1
2.5V
1.8V
1.5V
1.2V
Load Regulation
Line Regulation
Regulation Over Temperature
Total Output Voltage Regulation
Output Ripple and Noise
2
Output Ripple and Noise
2
Output Current Range
Output DC Current Limit
Shor t Circuit Surge
2.5V
1.8V
1.5V
1.2V
Turn on Time
Overshoot at Turn On
Output Capacitance
Transient Response
3
∆
V 50% to 100% of Max Load
Settling Time
All
∆
V 100% to 50% of Max Load
Settling Time
Ts
80
80
170
120
mV
µs
Ts
80
80
170
120
mV
µs
All
All
All
Cout
0
Ton
All
All
All
All
All
All
All
All
Iout
Ioutlim
Ioutsurge
0.07
0.07
0.07
0.07
7
0
0.1
0.1
0.1
0.1
15
1
2200
ms
%
µF
0
6
Module
Symbol
Vout
2.450
1.764
1.470
1.176
2.500
1.800
1.500
1.200
5
3
20
28
30
10
2.550
1.836
1.530
1.224
10
5
30
45
80
20
5
10
mV
mV
mV
mV
mVp-p
mVrms
A
A
A
2
s
Min
Typical
Max
Units
V
Note: All specifications are typical at nominal input, full load at 25° C unless otherwise stated.
1. Vin = 3.3V, Iout = full load, Ta = 25° C.
2. 0 - 20MHz, 1µF ceramic cap and 10µF aluminum cap on output.
3. di/dt = 0.5A/1µS, Ta = 25° C without external load capacitance.
©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-05C
NON-ISOLATED DC/DC CONVERTERS
3.3V Input / 1.2V – 2.5V Output / 5A
General Specifications
Parameter
Efficiency
1
2.5V
1.8V
1.5V
1.2V
Switching Frequency
Output Voltage Trim Range
2
2.5V
1.8V
1.5V
1.2V
Weight
All
90
90
90
90
4.9
105
110
110
110
g
All
Fsw
Module
Symbol
η
89
86
84
81
570
91
88
86
83
600
630
kHz
%
Min
Typical
Max
Units
%
1. Vin=3.3V, full load and Ta=25° C.
2. See graphs on pages 10-12.
Control Specifications
Parameter
Remote On/Off
3
Signal Low (Unit Off)
Signal High (Unit On)
Module
All
All
All
Symbol
Vouten
-0.3
1.8
1
3.6
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. 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
3.3V Input / 1.2V – 2.5V Output / 5A
POWER PRODUCTS
BP05xRAH-05C
Efficiency Data
Module 2.5V
Module 1.8V
96%
94%
92%
Efficiency
3.0V
3.3V
3.6V
94%
Efficiency
92%
90%
88%
86%
1
2
3
Output Current
4
5
90%
88%
86%
84%
82%
1
2
3
Output Current
4
5
3.0V
3.3V
3.6V
Module 1.5V
Module 1.2V
92%
90%
88%
86%
84%
82%
80%
1
2
3
Output Current
4
5
3.0V
3.3V
3.6V
89%
88%
87%
86%
85%
84%
83%
82%
81%
80%
79%
78%
1
2
3
Output Current
4
5
Efficiency
Efficiency
3.0V
3.3V
3.6V
Note: On/off pin designed to work with an open collector/drain switch.
©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