Microsoft Word - VRBA-06F1Ax_DS_120505.doc
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
2.4 V-5.5 V Input
0.75 V-3.63 V/6 A Output
Non-Isolated
Under-voltage Lockout (UVLO)
High
Efficiency
Wide
Trim
High
Power
Density
OCP/SCP
Fixed Frequency (300 kHz)
Remote
On/Off
Able to Sink & Source Current
Active
Low/High
(option)
Description
The Bel VRBA-06F1Ax modules are a series of non-isolated dc/dc converters that deliver up to 6A of output
current with full load efficiency of 93% at 3.3 V output. These modules provide precisely regulated voltage
programmable via external resistor from 0.75 V to 3.63 V over a wide range of input voltage (2.4 V-5.5 V). The
open-frame construction and small footprint enable designers to develop cost and space-efficient solutions.
Standard features include remote On/Off, over current protection, short circuit protection, wide input, and
programmable output voltage.
Part Selection
Output
Voltage
Input
Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Model Number
Active Low
Model Number
Active High
0.75 V -3.63 V
1
2.4 V - 5.5 V
6 A
21.8 W
93%
VRBA-06F1AL
VRBA-06F1A0
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" suffix at the end of the model number to indicate Tray Packaging.
Absolute Maximum Ratings
Parameter
Min
Typ
Max
Notes
Input Voltage (continuous)
-0.3 V
-
5.8 V
Output Enable Terminal Voltage
-0.3 V
-
5.5 V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-55
C
-
125
C
Note
: All specifications are typical at 25
C unless otherwise stated.
VRBA-06F1Ax 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
2.4 V-5.5 V Input
0.75 V-3.63 V/6 A Output
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
2.4 V
-
5.5 V
Vo, set
Vin-0.5 V
Input Current (full load)
Vo=3.3V
Vo=2.5V
Vo=1.8V
Vo=1.5V
Vo=1.2V
Vo=0.75V
-
-
-
-
-
-
-
-
-
-
-
-
4.73 A
3.66 A
4.09 A
4.31 A
3.57 A
2.40 A
Input Current (no load)
Vo=3.3 V
Vo=0.75 V
-
-
50 mA
25 mA
-
-
Remote Off Input Current
-
0.6 mA
-
Input Reflected Ripple Current (pk-pk)
-
120 mA
-
Input Reflected Ripple Current (rms)
-
35 mA
-
Tested with simulated source impedance
of 1 uH, 5 Hz to 20 MHz, one 1000 uF/25 V
AL capacitor and two 100 uF/ 10 V
Tantalum capacitor at the input.
I
2
t Inrush Current Transient
-
-
0.04 A
2
s
Turn-on Voltage Threshold
-
2.05 V
2.4 V
Turn-off Voltage Threshold
1.8 V
2.0 V
-
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
-2% Vo,set
-
2% Vo,set
Vin=5 V, 50% full load
Output Voltage Set Point
-3% Vo,set
-
3% Vo,set
Over all operating input voltages,
resistive loads and temperature
conditions
Adjustment Range Selected by
External Resistor or Voltage
0.7525 V
-
3.63 V
Load Regulation
-
0.4% Vo,set
-
Io=Io, min to 50%Io, max
Line Regulation
-
0.3% Vo,set
-
Vin=50% Vin, min to Vin, max
Regulation Over Temperature
(-40
C to +85 C)
-
0.4% Vo,set
-
Tref=Ta, min to Ta, max
Output Current
0 A
-
6 A
Current Limit Threshold
9 A
-
18 A
Short Circuit Surge Transient
-
0.32 A
2
s -
Ripple and Noise (pk-pk)
-
40 mV
70 mV
Ripple and Noise (rms)
-
10 mV
30 mV
Tested with 0-20 MHz, with 10 uF
Tantalum capacitor & 1 uF/10 V
ceramic capacitor at the output.
Turn on Time
-
6 mS
10 mS
Overshoot at Turn on
-
-
3%
Output Capacitance
ESR
1mohm
ESR
10mohm
0 uF
0 uF
-
-
1000 uF
3000 uF
Transient Response
50% ~ 100% Max Load
-
130 mV
-
Settling Time
-
25 uS
-
100% ~ 50% Max Load
-
130 mV
-
Settling Time
V
O
= 0.75 V -
3.63 V
- 25
uS
-
di/dt=2.5 A/uS; Vin=5 V; and with
10 uF Tantalum capacitor &
1 uF/10 V TDK ceramic capacitor
at the output
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
2.4 V-5.5 V Input
0.75 V-3.63 V/6 A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
Vo=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=1.5 V
Vo=1.2 V
Vo=0.75 V
-
-
-
-
-
-
93%
91%
88%
87%
84%
78%
-
-
-
-
-
-
Measured at Vin=5 V, full load
Switching Frequency
250 kHz
300 kHz
350 kHz
Over Temperature Shutdown
-
135
C
-
Output Voltage Trim Range
0.7525 V
-
3.63 V
MTBF
7,142,646 hours
Calculated Per Bell Core SR-332 (Vin=5 V;
Vo=0.75 V; I
O
= 4.8 A; T
a
= 25
C)
Dimensions
Inches (L W H)
Millimeters (L W H)
1.0 x 0.5 x 0.243
25.4 x 12.7 x 6.16
Weight -
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)
-0.2 V
-
0.3 V
Signal High (Unit On)
-
-
Vin, max
VRBA-06F1A0; Remote On/Off pin open, Unit
on.
Signal Low (Unit On)
-0.2 V
-
0.3 V
Signal High (Unit Off)
1.5 V
-
Vin, max
VRBA-06F1AL; 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.
11
.
5
7525
.
0
07
.
21
-
-
=
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
(
1698
.
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
2.4 V-5.5 V Input
0.75 V-3.63 V/6 A Output
Efficiency Data
3.3 V Module
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.6 A
1.5 A
3.0 A
4.5 A
6.0 A
Output Current
Ef
f
i
c
i
e
n
c
y
4.5 V
5 V
5.5 V
2.5 V Module
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.6 A
1.5 A
3.0 A
4.5 A
6.0 A
Output Current
Ef
f
i
c
i
en
c
y
4.5 V
5 V
5.5 V
1.8 V Module
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.6 A
1.5 A
3.0 A
4.5 A
6.0 A
Output Current
Ef
f
i
c
i
e
n
c
y
3 V
5 V
5.5 V
1.5 V Module
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.6 A
1.5 A
3.0 A
4.5 A
6.0 A
Output Current
E
f
f
i
ci
enc
y
2.4 V
5 V
5.5 V
1.2 V Module
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.6 A
1.5 A
3.0 A
4.5 A
6.0 A
Output Current
E
ffi
ci
e
n
c
y
2.4 V
5 V
5.5 V
0.7525 V Module
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.6 A
1.5 A
3.0 A
4.5 A
6.0 A
Output Current
Ef
f
i
c
i
e
n
c
y
2.4 V
5 V
5.5 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
2.4 V-5.5 V Input
0.75 V-3.63 V/6 A Output
Thermal Derating Curves
Vin=5 V, Vo = 3.3 V Vin=5 V, Vo = 0.75 V
Vin=4.5 V, Vo = 2.5 V Vin=3.3 V, Vo = 0.75 V
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