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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
4.5 V-14 V Input
0.75 V-5.0 V/3 A Output
Non-Isolated
OCP/SCP
Fixed
Frequency
Remote
On/Off
High
Efficiency
Wide
Trim
Range
High
Power
Density
Wide
Input
Range
Under-voltage
Lockout
(UVLO)
Active
Low/High
(Option)
Description
The Bel VRBA-03E1Ax modules are a series of non-isolated dc/dc converters that deliver up to 3 A of output
current with full load efficiency of 93% at 5.0 V output. These modules provide precisely regulated voltage
programmable via external resistor from 0.75 V to 5.0 V over a wide range of input voltage. Their open-frame
construction and small footprint enable designers to develop cost and space-efficient solutions. Standard
features include remote On/Off, programmable output voltage and over current protection.
Part Selection
Output
Voltage
Input
Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency at 5.0V
Model Number
Active High
Model Number
Active Low
0.75 V - 5 V
1
4.5 V - 14 V
3 A
15 W
93%
VRBA-03E1A0
VRBA-03E1AL
Notes
:
1.These modules use a buck topology, so the output voltages must be 0.5 V less than the input voltage.
2. Add "G" to the end of the Model Number to indicate Tray Packaging.
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Notes
Input Voltage (continuous)
-0.3 V
-
15 V
Output Enable Terminal Voltage
-0.3 V
-
15 V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-55
C
-
125
C
Note
: All specifications are typical at 25
C unless otherwise stated.
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
4.5 V
-
14 V
Vo, set
Vin-0.5 V
Input Current (full load)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
-
-
-
1.35 A
1.00 A
0.25 A
3.70 A
2.50 A
0.65 A
Input Current (no load)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
-
-
-
65 mA
50 mA
15 mA
80 mA
60 mA
20 mA
Remote Off Input Current
-
3 mA
6 mA
Input Reflected Ripple Current (pk-pk)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
-
-
-
150 mA
100 mA
35 mA
200 mA
150 mA
60 mA
Tested with simulated source
impedance of 1 uH, 5 Hz to 20 MHz and
two 100 uF/25 V external input
Tantalum capacitors.
VRBA-03E1Ax Series RoHS Compliant
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
4.5 V-14 V Input
0.75 V-5.0 V/3 A Output
Input Specifications (continued)
Parameter
Min
Typ
Max
Notes
Input Reflected Ripple Current (rms)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
-
-
-
50 mA
30 mA
12 mA
70 mA
50 mA
20 mA
Tested with simulated source
impedance of 1 uH, 5 Hz to 20 MHz and
two 100 uF/25 V external input
Tantalum capacitors.
I
2
t Inrush Current Transient
-
0.01 A
2
s
0.02 A
2
s
Turn-on Voltage Threshold
Vo set=5 V
Vo set3.3 V
-
-
5.5 V
4.3 V
6.5 V
4.5 V
Turn-off Voltage Threshold
Vo set=5 V
Vo set3.3 V
3.8V
3.8V
5.5 V
4.0 V
6.0 V
4.3 V
Note
: All specifications are typical at 25
C
unless otherwise stated.
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
-2%Vo,set
-
2%Vo,set
Vin=12 V, lo=lomax,
Output Voltage Set Point
-3.5%Vo,set
-
2.5%Vo,set
Over all operating input voltage,
resistive load, and temperature
conditions
Load Regulation
0.4%Vo,set
0.3%Vo,set
0.4%Vo,set
lo=lomin to lomax
Line Regulation
0.5%Vo,set
0.3%Vo,set
0.5%Vo,set
Vin=Vinmin to Vinmax
Regulation Over Temperature
-
0.5%Vo,set
-
-40
C to +85 C
Output Current
0 A
-
3 A
Current Limit Threshold
5 A
-
9.5 A
Short Circuit Surge Transient
- 0.1
A
2
s 0.2
A
2
s
Ripple and Noise (pk-pk)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
-
-
-
130 mV
100 mV
35 mV
150 mV
120 mV
45 mV
Ripple and Noise (rms)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
-
-
-
40 mV
30 mV
10 mV
50 mV
40 mV
20 mV
Test conditions:
0-20 MHz BW, with external 10 uF/
10 V Tantalum capacitor and 1 uF/
10 V ceramic capacitor at the output.
Ripple and Noise (pk-pk)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
-
-
-
70 mV
55 mV
20 mV
85 mV
70 mV
30 mV
Ripple and Noise
(rms)
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
-
-
-
20 mV
15 mV
5 mV
30 mV
25 mV
10 mV
Test conditions:
0-20 MHz BW, with external 10 uF/
10 V Tantalum capacitor 1 uF/10 V
ceramic capacitor and two 22 uF/10 V
ceramic capacitors at the output.
Turn on Time
-
8 mS
12 mS
Overshoot at Turn on
-
0%
3%
Output Capacitance
0 uF
-
1200 uF
Transient Response
50% ~ 100% Max Load
-
200 mV
300 mV
Settling Time
-
20 uS
50 uS
100% ~ 50% Max Load
-
200 mV
300 mV
Settling Time
All
- 20
uS
50 uS
Test conditions: di/dt = 2.5 A/uS,
Vin=12 V, and with external 10 uF/
10 V Tantalum capacitor and 1 uF/
10 V ceramic capacitor at the output.
Note
: All specifications are typical at nominal input (Vin=12 V), 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
4.5 V-14 V Input
0.75 V-5.0 V/3 A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
Vo=5.0 V
Vo=3.3 V
Vo=0.75 V
90%
88%
77%
93%
91%
80%
-
-
-
Measured at Vin=12 V, full load
Switching Frequency
200 kHz
230 kHz
250 kHz
Output Voltage Trim Range (Wide
Trim)
0.7525 V
-
5 V
MTBF
7,900,000 hours
Calculated Per Bell Core SR-332 (I
O
=
Nominal; T
a
= 25
C)
Dimensions (Vertical Mount)
Inches (L W H)
Millimeters (L W H)
1.0 x 0.5 x 0.27
25.41 x 12.7 x 6.85
Weight -
2.5
g
-
Note
: All specifications are typical at 25
C
unless otherwise stated.
Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
Signal Low (Unit Off)
-0.3 V
-
0.4 V
Signal High (Unit On)
2.5 V
-
14 V
Signal Low (Unit On)
-0.3 V
-
0.4 V
Signal High (Unit Off)
2.5 V
-
14 V
Remote On/Off pin open, Unit on.
Output Trim Equations
Equation for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up resistor should be connected between the Trim pin and Ground.
1
7525
.
0
507
.
10
-
-
=
adj
trim
V
R
Equation for calculating the trim voltage (in V) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up voltage should be connected between the Trim pin and Ground.
)
7525
.
0
(
0667
.
0
7
.
0
-
-
=
adj
trim
V
V
Rtrim
Module
Vout
GND
Trim
Vtrim
Module
Vout
GND
Trim
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
4.5 V-14 V Input
0.75 V-5.0 V/3 A Output
Efficiency Data
MODULE 5.0V
60.0%
70.0%
80.0%
90.0%
100.0%
0.30A
0.75A
1.50A
2.25A
3.00A
OUTPUT CURRENT
E
FFI
C
I
EN
C
Y
7.0V
12.0V
14.0V
MODULE 3.3V
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.30A
0.75A
1.50A
2.25A
3.00A
OUTPUT CURRENT
EFF
I
C
I
E
N
C
Y
4.5V
12.0V
14.0V
MODULE 0.75V
50.0%
60.0%
70.0%
80.0%
90.0%
0.30A
1.75A
1.50A
2.25A
3.00A
OUTPUT CURRENT
EFFI
C
I
E
N
C
Y
4.5V
12.0V
14.0V
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
4.5 V-14 V Input
0.75 V-5.0 V/3 A Output
Thermal Derating Curves
Vin=12 V, Vo=5.0 V
Vin=12 V, Vo=3.3 V
Vin=12 V, Vo=0.75 V
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