NON-ISOLATED DC/DC CONVERTERS
5 Vdc - 24 Vdc Input
0.9 Vdc - 3.3 Vdc/3 A Output
xRAH-03L1A0
•
•
•
•
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-03L1A0 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 3.3 Vdc. It is
packaged in a compact, overmolded package rated at 3 A. 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 for 3.3 Vdc output is typically 88% at full load. Typical features include remote on/off, over current
protection and short circuit protection.
Part Selection
Output
Voltage
0.9 V - 3.3 V
Input
Voltage
5.0 V - 24 V
Max. Output
Current
3A
Max. Output
Power
10 W
Typical
Efficiency
88%
Part Number
Surface Mount
SRAH-03L1A0
Part Number
Vertical Mount
VRAH-03L1A0
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
=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)
I t Inrush Current Transient
Turn on Voltage Threshold
Turn off Voltage Threshold
2
Min
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
18 V
15 V
12 V
9V
100 mA
3A
10 mA
-
-
0.1 A s
-
4.9 V
2
Notes
With simulated source impedance of 500 nH,
5 Hz to 20 MHz. Use one 100 uF/ 35 V
Tantalum capacitor and one 3.3 uF/ 50 V
ceramic capacitor at the input
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 Output
Output Specifications
Parameter
Output Voltage Set Point
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
=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
=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
=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
Output DC Current Limit
Short Circuit Surge Transient
Ripple and Noise (rms)
Ripple and Noise (pk-pk)
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
Transient Response
Overshoot
50% ~ 100%
Max Load
Settling Time
Overshoot
100% ~ 50%
Max Load
Settling Time
Overshoot
50% ~ 100%
Max Load
Settling Time
Overshoot
100% ~ 50%
Max Load
Settling Time
-
-
-
-
-
-
-
-
-
-
-
-
0A
4A
-
-
-
-
-
-
-
-
-
-
0 uF
-
-
-
-
-
-
-
-
±25 mV
±15 mV
±10 mV
±10 mV
±8 mV
±5 mV
±30 mV
±25 mV
±20 mV
±15 mV
±10 mV
±8 mV
-
-
2
0.8 A s
30 mV
70 mV
70 mV
60 mV
60 mV
50 mV
50 mV
7 mS
0%
-
150 mV
50 uS
150 mV
50 uS
100 mV
50 uS
100 mV
50 uS
±45 mV
±35 mV
±25 mV
±20 mV
±15 mV
±13 mV
±60 mV
±45 mV
±33 mV
±27 mV
±22 mV
±16 mV
3A
8A
2
1.5 A s
50 mV
130 mV
100 mV
100 mV
100 mV
100 mV
100 mV
10 mS
3%
1200 uF
200 mV
100 uS
200 mV
100 uS
150 mV
100 uS
150 mV
100 uS
Test conditions:
0-20 MHz BW, with 1 uF
/16 V ceramic capacitor
at the output.
-
-
-
-
-
-
±10 mV
±10 mV
±5 mV
±5 mV
±5 mV
±3 mV
±20 mV
±15 mV
±10 mV
±10 mV
±10 mV
±7.5 mV
Min
3.200 V
2.425 V
1.746 V
1.470 V
1.176 V
0.882 V
Typ
3.3 V
2.5 V
1.8 V
1.5V
1.2 V
0.9 V
Max
3.400 V
2.575 V
1.854 V
1.530 V
1.224 V
0.918 V
Notes
Test conditions:
Io=50% full load.
3.3 V
Test conditions:
di/dt = 0.5 A/us, with
220 uF external
capacitor at the output.
0.9 V-2.5 V
Note:
All specifications are typical at nominal input, full load at 25
°C
unless otherwise stated.
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 Output
General Specifications
Parameter
Efficiency
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
-
85%
82%
79%
77%
74%
72%
250 kHz
88%
85%
82%
80%
77%
75%
300 kHz
9,900,543 hours
-
-
-
-
-
-
360 kHz
Calculated Per Bell Core SR-332
(Vin=12 V; Vo=3.3 V; I
O
=2.4 A; T
a
=
25
°C)
Min
Typ
Max
Notes
Vin=12.0V; lo=lo, max
0.78 x 0.7 x 0.32
19.81 x 17.78 x 8.13
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)
Min
-0.3 V
2.8 V
Typ
-
-
Max
1V
24 V
Notes
Remote on/off pin open, Unit On
Output Trim Equations
Equations for calculating the trim resistor 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.
⎞
⎛
6.928
Rtrim
_
up
= ⎜
⎟
⎜
Vadj
_
up
−
Vo
−
1
⎟
Kohm
⎠
⎝
Vout
Module
Trim
Rtrim-up
GND
Note:
Output voltage Vo=0.902 V when Rtrim_up is not connected.
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 Output
Efficiency Data
Efficiency Curve
100.0%
90.0%
Efficiency
80.0%
70.0%
60.0%
50.0%
40.0%
0.30
0.75
1.50
Output current (A)
2.25
3.00
5V
12 V
24 V
Vo=3.3 V
Efficiency Curve
100.0%
90.0%
Efficiency
80.0%
70.0%
60.0%
50.0%
40.0%
0.30
0.75
1.50
Output current (A)
2.25
3.00
5V
12 V
18 V
Vo=1.8 V
Efficiency Curve
100.0%
90.0%
Efficiency
80.0%
70.0%
60.0%
50.0%
40.0%
0.30
0.75
1.50
Output current (A)
2.25
3.00
5V
7V
9V
Vo=0.9 V
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 Output
Thermal Derating Curve
xRAH-03L1A0
Ripple and Noise Waveforms
5 Vdc input, 0.9 V output
12 Vdc input, 1.8 V output
12 Vdc input, 3.3 V output
Note:
Ripple and noise at full load, with 1uF/16V ceramic cap at the output, Ta=25 deg C.
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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