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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
4.5V-14V Input
0.75V-5.0V/3A 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 V7BA-03E1Ax modules are a series of non-isolated DC/DC converters that deliver up to 3A of output
current with full load efficiency of 93% at 5.0V output. These modules provide precisely regulated voltage
programmable via external resistor from 0.75V to 5.0V 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
0.75V 5.0V
4.5V - 14V
3A
15W 93%
V7BA-03E1A0
V7BA-03E1AL
Note
: Add "G" suffix at the end of the model number to indicate "Tray Packaging".
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Notes
Input Voltage (continuous)
-0.3V
-
15V
Output Enable Terminal Voltage
-0.3V
-
15V
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
Vo,set3.3V
Vo,set=5V
4.5V
7.0V
12V
12V
14V
14V
Input Current (full load)
Vo=5.0V
Vo=3.3V
Vo=0.75V
-
-
-
1.35A
1.00A
0.25A
3.70A
2.50A
0.65A
Input Current (no load)
Vo=5.0V
Vo=3.3V
Vo=0.75V
-
-
-
65mA
50mA
15mA
80mA
60mA
20mA
Remote Off Input Current
-
3mA
6mA
Input Reflected Ripple Current (pk-pk)
Vo=5.0V
Vo=3.3V
Vo=0.75V
-
-
-
150mA
100mA
35mA
200mA
150mA
60mA
Tested with simulated source
impedance of 1uH, 5Hz to 20MHz and
two 100uF/25V external input Tantalum
capacitors.
V7BA-03E1Ax Series
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
4.5V-14V Input
0.75V-5.0V/3A Output
Input Specifications (continued)
Parameter
Min
Typ
Max
Notes
Input Reflected Ripple Current (RMS)
Vo=5.0V
Vo=3.3V
Vo=0.75V
-
-
-
50mA
30mA
12mA
70mA
50mA
20mA
Tested with simulated source
impedance of 1uH, 5Hz to 20MHz and
two 100uF/25V external input Tantalum
capacitors.
I
2
t Inrush Current Transient
-
0.01A
2
s 0.02A
2
s
Turn-on Voltage Threshold
Vo set=5V
Vo set3.3V
-
-
5.5V
4.3V
6.5V
4.5V
Turn-off Voltage Threshold
Vo set=5V
Vo set3.3V
3.8V
3.8V
5.5V
4.0V
6.0V
4.3V
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=12V, 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 +85C
Output Current
0A - 3A
Current Limit Threshold
5A -
9.5A
Short Circuit Surge Transient
- 0.1A
2
s 0.2A
2
s
Ripple and Noise (pk-pk)
Vo=5.0V
Vo=3.3V
Vo=0.75V
-
-
-
130mV
100mV
35mV
150mV
120mV
45mV
Ripple and Noise (RMS)
Vo=5.0V
Vo=3.3V
Vo=0.75V
-
-
-
40mV
30mV
10mV
50mV
40mV
20mV
Test conditions:
0-20MHz BW, with external 10uF/10V
Tantalum capacitor and 1uF/10V
ceramic capacitor at the output.
Ripple and Noise (pk-pk)
Vo=5.0V
Vo=3.3V
Vo=0.75V
-
-
-
70mV
55mV
20mV
85mV
70mV
30mV
Ripple and Noise
(RMS)
Vo=5.0V
Vo=3.3V
Vo=0.75V
-
-
-
20mV
15mV
5mV
30mV
25mV
10mV
Test conditions:
0-20MHz BW, with external 10uF/10V
Tantalum capacitor 1uF/10V ceramic
capacitor and two 22uF/10V ceramic
capacitors at the output.
Turn on Time
-
8mS
12mS
Overshoot at Turn on
-
0%
3%
Output Capacitance
0uF
-
1200uF
Transient Response
50% ~ 100% Max Load
-
200mV
300mV
Settling Time
-
20uS
50uS
100% ~ 50% Max Load
-
200mV
300mV
Settling Time
All
- 20uS
50uS
Test conditions: di/dt = 2.5A/uS,
Vin=12V, and with external 10uF/10V
Tantalum capacitor and 1uF/10V
ceramic capacitor at the output.
Note
: All specifications are typical at nominal input (Vin=12V), 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
4.5V-14V Input
0.75V-5.0V/3A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
Vo=5.0V
Vo=3.3V
Vo=0.75V
90%
88%
77%
93%
91%
80%
-
-
-
Measured at Vin=12V, full load
Switching Frequency
200KHz
230KHz
250KHz
Output Voltage Trim Range (Wide
Trim)
0.7525V -
5V
MTBF
7,900,000 hours
Calculated Per Bell Core TR-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 -
2.5g
-
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)
-0.3V
-
0.4V
Signal High (Unit On)
2.5V
-
14V
Signal Low (Unit On)
-0.3V
-
0.4V
Signal High (Unit Off)
2.5V
-
14V
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
4.5V-14V Input
0.75V-5.0V/3A 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
EFFI
C
I
E
N
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
EF
FI
C
I
EN
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
E
FFI
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
4.5V-14V Input
0.75V-5.0V/3A Output
Thermal Derating Curves
Vin=12V, Vo=5.0V
Vin=12V, Vo=3.3V
Vin=12V, Vo=0.75V
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