NON-ISOLATED DC/DC CONVERTERS
5 Vdc - 24 Vdc Input
0.9 Vdc - 3.3 Vdc/3 A, 5 Vdc/2 A Output
xRAH-03L2A0
•
•
•
•
Non-Isolated
High Efficiency
High Power Density
Low Cost
RoHS Compliant
•
•
•
•
Remote On/Off
Fixed Frequency
OCP/SCP
Rev.A
UL60950-1 Recognized (UL/cUL)
Description
The Bel xRAH-03L2A0 modules are a series of non-isolated, step down dc/dc converters that operate from a
nominal 12 Vdc source. These converters are available in an output voltage range from 0.9 Vdc to 5 Vdc. It is
packaged in a compact, overmolded package rated at 3 A (0.9 Vdc-3.3 Vdc) and 2 A (5 Vdc). Optional lead
forming provides a vertical mount product for minimal footprint or a surface mount option for a very low profile.
The output is closely regulated and the efficiency is typically 91% at full load. Typical features include remote
on/off, over current protection and short circuit protection.
Part Selection
Output
Voltage
0.9 V - 5.0 V
Input
Voltage
5 V - 24 V
Max. Output
Current
3A
Max. Output
Power
10 W
Typical
Efficiency
91%
Part Number
Surface Mount
SRAH-03L2A0
Part Number
Vertical Mount
VRAH-03L2A0
Notes:
1. Add “0” suffix at the end of the model number to indicate “Tube Packaging”, and “R” for “Reel
Packaging”, and “G” for “Tray Packaging”.
2. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
Absolute Maximum Ratings
Parameter
Input Voltage (continuous)
Output Enable Terminal Voltage
Ambient Temperature
Storage Temperature
Min
-0.3 V
-0.3 V
-40
°C
-40
°C
Typ
-
-
-
-
Max
25 V
24 V
85
°C
125
°C
Notes
Input Specifications
Parameter
Input Voltage
V
O
=5.0 V
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
Vo=1.5 V
Vo=1.2 V
Vo=0.9 V
Input Current (no load)
Input Current (full load)
Remote Off Input Current
Input Reflected Ripple Current
(pk-pk)
Input Reflected Ripple Current
(rms)
2
I t Inrush Current Transient
Turn on Voltage Threshold
Turn off Voltage Threshold
Min
9V
5V
5V
5V
5V
5V
5V
-
-
-
-
-
-
-
3.5 V
Typ
-
-
-
-
-
-
-
-
-
3 mA
200 mA
50 mA
0.05 A s
4.0 V
-
2
Max
24 V
24 V
24 V
18 V
15 V
12 V
9V
100 mA
2.5 A
10 mA
-
-
0.1 A s
-
4.9 V
2
Notes
With simulated source impedance of 500
nH, 5 Hz-20 MHz. Use one 2*47 uF/35 V
Tantalum capacitor and one 3.3 uF/50 V
ceramic capacitor at the output.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
5 Vdc - 24 Vdc Input
0.9 Vdc - 3.3 Vdc/3 A, 5 Vdc/2 A Output
Output Specifications
Parameter
Output Voltage Set Point
V
O
=5.0 V
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Line Regulation
V
O
=5.0 V
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Load Regulation
V
O
=5.0 V
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Regulation Over Temperature
(-40
°C
to +85
°C)
V
O
=5.0 V
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Output Current Range
V
O
=5.0 V
V
O
=0.9 V-3.3 V
Output DC Current Limit
Short Circuit Surge Transient
Ripple and Noise (rms)
Ripple and Noise (pk-pk)
V
O
=5.0 V
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=0.9 V
Turn on Time
Overshoot at Turn on
Output Capacitance
-
-
-
-
-
-
-
-
-
240 uF
50 mV
50 mV
40 mV
40 mV
40 mV
30 mV
30 mV
7 mS
0%
-
100 mV
100 mV
80 mV
80 mV
80 mV
60 mV
60 mV
10 mS
3%
1200 uF
0A
0A
4A
-
-
-
-
-
0.8 A s
20 mV
2
Min
4.850 V
3.200 V
2.425 V
1.746 V
1.470 V
1.176 V
0.882 V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ
5.0 V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
0.9 V
±15 mV
±15 mV
±15 mV
±10 mV
±10 mV
±10 mV
±10 mV
±25 mV
±25 mV
±25 mV
±20 mV
±20 mV
±10 mV
±10 mV
Max
5.150 V
3.400 V
2.575 V
1.854 V
1.530 V
1.224 V
0.918 V
±35 mV
±35 mV
±35 mV
±25 mV
±25 mV
±25 mV
±25 mV
±65 mV
±65 mV
±50 mV
±40 mV
±40 mV
±30 mV
±30 mV
Notes
Test conditions:
Io=50% full load.
-
-
-
-
-
-
-
±60 mV
±60 mV
±50 mV
±50 mV
±40 mV
±30 mV
±30 mV
±100 mV
±100 mV
±90 mV
±90 mV
±80 mV
±70 mV
±70 mV
2A
3A
8A
1.5 A s
50 mV
Test conditions:
0-20 MHz BW, with 220 uF/
10 V Tantalum capacitor and
22 uF/10 V ceramic capacitor
at the output.
2
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
5 Vdc - 24 Vdc Input
0.9 Vdc - 3.3 Vdc/3 A, 5 Vdc/2 A Output
Output Specifications (continued)
Parameter
Transient Response
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
0.9 V-2.5 V
3.3 V-5.5 V
Min
-
-
-
-
-
-
-
-
Typ
120 mV
50 uS
120 mV
50 uS
100 mV
50 uS
100 mV
50 uS
Max
180 mV
100 uS
180 mV
100 uS
150 mV
100 uS
150 mV
100 uS
di/dt=0.5 A/uS, with a
220 uF/10 V tantalum
cap and a 22 uF/10 V
ceramic cap at the
output
Notes
Note:
All specifications are typical at nominal input, full load at 25
°C
unless otherwise stated.
General Specifications
Parameter
Efficiency
V
O
=5.0 V
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
Vo=0.9 V
Switching Frequency
MTBF
Dimensions (surface mount)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Dimensions (vertical)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
-
12 V
12 V
12 V
12 V
12 V
8V
5V
87%
84%
82%
79%
76%
74%
71%
250 kHz
91%
88%
86%
83%
80%
78%
75%
300 kHz
-
-
-
-
-
-
-
360 kHz
Calculated Per Bell Core SR-332
(Vin=12 V; Vo=3.3 V, I
O
= 2.4 A; T
a
=
25
°C)
Vin
Min
Typ
Max
Notes
Vin=12.0 V; lo=lomax
9,900,543 hours
0.78 x 0.7 x 0.32
19.812 x 17.78 x 8.128
0.7 x 0.308 x 0.65
17.78 x 7.82 x 16.51
4.9 g
-
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit Off)
Signal High (Unit On)
Current Sink
Min
-0.3 V
2.8 V
-3 mA
Typ
-
-
-
Max
1V
24 V
5 mA
Notes
Remote on/off pin is open, Unit On
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
5 Vdc - 24 Vdc Input
0.9 Vdc - 3.3 Vdc/3 A, 5 Vdc/2 A Output
Output Trim Equations
Equations for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) and the nominal output
voltage of the converter (Vo) are shown below. The Trim Up resistor should be connected between the Trim pin
and Ground. Only one of the resistors should be used for any given application.
R
trim
−
up
=
Vo (V)
0.902
1.2
1.5
1.8
2.5
3.3
5
6.928
−
1
V
adj
−
V
o
Rtrim(kΩ)
Open
22.248
10.585
6.715
3.335
1.889
0.691
Module
Vout
Trim
Rtrim-up
GND
Note:
Output voltage Vo=0.902 V when Rtrim_up is not connected.
Efficiency Data
5.0V module
100.0%
90.0%
80.0%
70.0%
60.0%
50.0%
40.0%
0.2A
0.5A
1A
output current
1.5A
2A
100.0%
90.0%
3.3V module
efficiency
9.0V
12.0V
24.0V
Efficiency
80.0%
70.0%
60.0%
50.0%
40.0%
0.3A
0.75A
1.5A
Output current
2.25A
3A
5V
12V
24V
1.8V module
100.0%
90.0%
Efficiency
0.9V module
100.0%
90.0%
Efficiency
5V
12V
18V
80.0%
70.0%
60.0%
50.0%
40.0%
0.3A
0.75A
1.5A
Output current
2.25A
3A
80.0%
70.0%
60.0%
50.0%
40.0%
0.3A
0.75A
1.5A
Output current
2.25A
3A
5V
7V
9V
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
5 Vdc - 24 Vdc Input
0.9 Vdc - 3.3 Vdc/3 A, 5 Vdc/2 A Output
Thermal Derating Curve
xRAH-03L2A0
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
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