NON-ISOLATED DC/DC CONVERTERS
2.4 V - 5.5 V Input
0.75 V - 3.63 V/6 A Output
VRBA-06F2Ax Series
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•
•
•
•
Non-Isolated
High Efficiency
High Power Density
Fixed Frequency (300 kHz)
Flexible Output Voltage
Sequencing
RoHS Compliant
•
•
•
•
•
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Under-voltage Lockout (UVLO)
Wide Trim
OCP/SCP
Remote On/Off
Active Low/High (option)
Able to Sink & Source Current
Description
The Bel VRBA-06F2Ax 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).
These modules have a sequencing feature that enables designers to implement various types of output voltage
sequencing when powering multiple voltages on a board. 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
0.75 V -3.63 V
1
Input
Voltage
2.4 V - 5.5 V
Max. Output
Current
6A
Max. Output
Power
21.8 W
Typical
Efficiency
93%
Model Number
Active Low
VRBA-06F2AL
Model Number
Active High
VRBA-06F2A0
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
Input Voltage (continuous)
Output Enable Terminal Voltage
Sequencing Voltage
1
Min
-0.3 V
-0.3 V
-0.3 V
-40
°C
-55
°C
Typ
-
-
-
-
-
Max
5.8 V
5.5 V
Vin
85
°C
125
°C
Notes
Ambient Temperature
Storage Temperature
Notes:
All specifications are typical at 25
°C
unless otherwise stated.
1. VRBA-06F2Ax series of modules include a sequencing feature that enables users to implement
various types of output voltage sequencing in their applications. This is accomplished via an additional
sequencing pin. When not used sequencing feature, tie the SEQ pin to Vin.
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
Input Voltage
Vo≤ 1.5 V
Vo=1.8 V
2.5 V≤ Vo
≤3.3
V
Input Current (full load)
Vo=3.3V
Vo=2.5V
Vo=1.8V
Vo=1.5V
Vo=1.2V
Vo=0.75V
Input Current (no load)
Vo=3.3 V
Vo=0.75 V
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
2.4 V
3.0 V
4.5 V
-
-
-
-
-
-
-
-
-
-
-
-
-
1.8 V
Typ
-
-
-
-
-
-
-
-
-
50 mA
25 mA
0.6 mA
120 mA
35 mA
-
2.05 V
2.0 V
Max
5.5 V
5.5 V
5.5 V
4.73 A
3.66 A
4.09 A
4.31 A
3.57 A
2.40 A
-
-
-
-
-
0.04 A s
2.4 V
-
2
Notes
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.
Output Specifications
Parameter
Output Voltage Set Point
Output Voltage Set Point
Adjustment Range Selected by
External Resistor or Voltage
Load Regulation
Line Regulation
Regulation Over Temperature
(-40
°C
to +85
°C)
Output Current
Current Limit Threshold
Short Circuit Surge Transient
Ripple and Noise (pk-pk)
Ripple and Noise (rms)
Min
-2% Vo,set
-3% Vo,set
0.7525 V
-
-
-
0A
9A
-
-
-
Typ
-
-
-
0.4% Vo,set
0.3% Vo,set
0.4% Vo,set
-
-
0.32 A s
40 mV
10 mV
6 mS
-
-
-
-
-
-
-
2
Max
2% Vo,set
3% Vo,set
3.63 V
-
-
-
6A
18 A
-
70 mV
30 mV
10 mS
3%
1000 uF
3000 uF
130 mV
25 uS
130 mV
25 uS
-
-
-
-
Notes
Vin=5 V, 50% full load
Over all operating input voltages, resistive
loads and temperature conditions
Io=Iomin to 50%Iomax to 100%Iomax
Vin=Vinmin to 50%Vinmax to 100%Vinmax
Tref=Tamin to Tamax
Tested with 0-20 MHz, with 10 uF
Tantalum capacitor & 1 uF/10 V ceramic
capacitor at the output.
Turn on Time
-
Overshoot at Turn on
-
Output Capacitance
Min ESR
≥
1mohm
0 uF
0 uF
Max ESR
≥
10mohm
Transient Response
50% ~ 100% Max Load
Settling Time V
O
= 0.75 V -
3.63 V
100% ~ 50% Max Load
Settling Time
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
Parameter
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
Switching Frequency
Over Temperature Shutdown
Output Voltage Trim Range
MTBF
Dimensions
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
-
1.0 x 0.5 x 0.243
25.4 x 12.7 x 6.16
5g
-
-
-
-
-
-
-
250 kHz
-
0.7525 V
93%
91%
88%
87%
84%
78%
300 kHz
135
°C
-
7,142,646 hours
-
-
-
-
-
-
350 kHz
-
3.63 V
Measured at Vin=5 V, full load
0.75 V - 3.63 V/6 A Output
Min
Typ
Max
Notes
General Specifications
Calculated Per Bell Core SR-332 (Vin=5 V;
Vo=0.75 V; I
O
= 4.8 A; T
a
= 25°C)
Note:
All specifications are typical at 25
°C
unless otherwise stated.
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit Off)
Signal High (Unit On)
Signal Low (Unit On)
Signal High (Unit Off)
Sequencing Voltage
Sequencing Slew Rate Capability
Sequencing Delay Time
Tracking Accuracy
Power-Up
Power-Down
-
-
100 mV
200 mV
200 mV
400 mV
Min
-0.2 V
-
-0.2 V
1.5 V
0V
-
10 mS
Typ
-
-
-
-
-
-
-
Max
0.3 V
Vin, max
0.3 V
Vin, max
Vin
2 V/mS
-
Delay from Vin, min to application of voltage
on SEQ pin
Notes
VRBA-06F2A0; Remote On/Off pin open, Unit
on.
VRBA-06F2AL; Remote On/Off pin open, Unit
on.
Sequencing Voltage applied on SEQ pin
should be higher than output voltage.
Output Trim Equations
Equation for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up resistor should be connected between the Trim pin and Ground.
Vout
R
trim
=
21.07
−
5.11
V
adj
−
0.7525
Module
Trim
GND
Rtrim
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.
Vout
V
trim
=
0.7
−
0.1698
×
(
V
adj
−
0.7525)
Module
Trim
Vtrim
GND
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
Efficiency Curve
100.0%
95.0%
90.0%
Efficiency
Efficiency Curve
100.0%
95.0%
90.0%
Efficiency
4.5 V
5.0 V
5.5 V
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
0.6
1.5
3.0
Output Current (A)
4.5
6.0
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
0.6
1.5
3.0
Output Current (A)
4.5
6.0
4.5 V
5.0 V
5.0 V
Vo=3.3 V
Efficiency Curve
100.0%
95.0%
90.0%
Efficiency
Vo=2.5 V
Efficiency Curve
100.0%
95.0%
90.0%
Efficiency
3.0 V
5.0 V
5.5 V
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
0.6
1.5
3.0
Output Current (A)
4.5
6.0
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
0.6
1.5
3.0
Output Current (A)
4.5
6.0
2.4 V
5.0 V
5.5 V
Vo=1.8 V
Vo=1.5 V
Efficiency Curve
100.0%
95.0%
90.0%
Efficiency
2.4 V
5.0 V
5.5 V
Efficiency Curve
100.0%
95.0%
90.0%
Efficiency
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
0.6
1.5
3.0
Output Current (A)
4.5
6.0
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
0.6
1.5
3.0
Output Current (A)
4.5
6.0
2.4 V
5.0 V
5.5 V
Vo=1.2 V
Vo=0.7525 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
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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