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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
2.4 V - 5.5 V Input
0.75 V - 3.63 V/16A Output
Non-Isolated
Under-voltage Lockout (UVLO)
High
Efficiency
Over
Temperature
Protection
High
Power
Density
Remote
Sense
OCP/SCP
Wide
Input
Fixed Frequency (300 kHz)
Wide
Trim
Range
Converter can sink and source
current
Remote
On/Off
Active
Low/High
(option)
Description
The Bel VRBC-16F1Ax modules are a series of non-isolated dc/dc converters that can deliver up to 16 A of
output current with full load efficiency of 94% 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). 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
Model Number
Active Low
Model
Number
Active High
Model
Number
Active Low
0.75 V-3.63 V
1
2.4 V-5.5 V
16 A
58.1 W
94%
VRBC-16F1AL
VRBC-16F1A0 VRBC-16F1AW
2
Notes
:
1. These modules use a buck topology, so the output voltages must be 0.8 V less than the input voltage.
2. "W" indicates special coating.
3. 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
-
5.8 V
Output Enable Terminal Voltage
-0.3 V
-
5.8 V
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-55
C
-
125
C
Notes
: All specifications are typical at 25
C
unless otherwise stated.
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
2.4 V
-
5.5 V
Vo, set
Vin-0.8 V
Input Current (full load)
Vo=3.3 V
Vo=1.8 V
Vo=0.75 V
-
-
-
11.23 A
6.47 A
3.08 A
12.89 A
13.55 A
6.67 A
Input Current (no load)
-
80 mA
-
Remote Off Input Current
-
10 mA
22 mA
VRBC-16F1Ax 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/16A Output
Input Specifications (continued)
Parameter
Min
Typ
Max
Notes
Input Reflected Ripple Current (pk-pk)
-
100 mA
-
Input Reflected Ripple Current (rms)
-
40 mA
-
Tested with two 100 uF / 10 V tantalum
input capacitors (P/N:
TPSC107K010R0075 AVX) & simulated
source impedance of 1 uH, 5 Hz to 20
MHz.
I
2
t Inrush Current Transient
-
0.15 A
2
s
0.3 A
2
s
Turn-on Voltage Threshold
-
2.2 V
-
Turn-off Voltage Threshold
-
2.0 V
-
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
-2% Vo,set
-
2% Vo,set
Vin=5 V, lo=lomax full load
Output Voltage Set Point
-3% Vo,set
-
3% Vo,set
Over all operating input
voltages, resistive loads and
temperature conditions
Load Regulation
-
0.4% Vo,set
-
Io=Io, min to Io, max
Line Regulation
-
0.3% Vo,set
-
Vin=Vin, min to Vin, max
Regulation Over Temperature
(-40
C to +85 C)
-
0.5% Vo,set
-
Tref=Ta, min to Ta, max
Output Current
0 A
-
16 A
Current Limit Threshold
19 A
-
35 A
Short Circuit Surge Transient
- 1.6
A
2
s 2
A
2
s
Ripple and Noise (pk-pk)
-
25 mV
50 mV
Ripple and Noise (rms)
-
8 mV
15 mV
Tested with 0-20 MHz, 10 uF /
16 V tantalum capacitor & 1 uF
/ 10 V TDK ceramic capacitor
at the output
Turn on Time
-
4 mS
8 mS
Overshoot at Turn on
-
0% Vo,set
3% Vo,set
Output Capacitance
ESR
1 mohm
ESR
10 mohm
0 uF
0 uF
-
-
1000 uF
5000 uF
Transient Response
50% ~ 100% Max Load
-
300 mV
-
Settling Time
-
50 uS
-
100% ~ 50% Max Load
-
300 mV
-
Settling Time
V
O
=0.75 V -
3.3 V
- 50
uS
-
di/dt=2.5 A/uS; Vin=5 V; and
with 10 uF / 16 V tantalum
capacitor & 1 uF / 10 V ceramic
capacitor at the output
Transient Response
50% ~ 100% Max Load
-
150 mV
-
Settling Time
-
100 uS
-
100% ~ 50% Max Load
-
150 mV
-
Settling Time
V
O
=0.75 V -
3.3 V
- 100
uS
-
di/dt=2.5 A/uS; Vin=5 V; and
with two 150 uF / 10 V
tantalum capacitors & 1 uF / 10
V ceramic capacitor at the
output
Note
: All specifications are typical at nominal input (Vin = 5 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
2.4 V - 5.5 V Input
0.75 V - 3.63 V/16A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
Vo=3.3 V
Vo=1.8 V
Vo=0.75 V
91%
86%
75%
94%
89%
78%
-
-
-
Measured at Vin=5 V, full load
Switching Frequency
250 KHz
300 KHz
350 KHz
Over Temperature Shutdown
-
125
C
-
Output Trim Range (Wide Trim)
0.7525 V
-
3.63 V
Remote Sense Compensation
-
-
5%
Total adjustment of trim, setpoint and
remote sense combined should not
exceed 3.63 V. Vo=0.7525 V when trim
pin open
MTBF 5,500,000
hours
Calculated Per Bell Core SR-332 (I
O
=
Nominal; T
a
= 25
C)
Dimensions
Inches (L W H)
Millimeters (L W H)
2.0 x 0.5 x 0.363
50.80 x 12.7 x 9.23
Weight -
8.3
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
-
0.3 V
Signal High (Unit On)
1.5 V
-
5.8 V
VRBC-16F1A0; Remote On/Off pin
open, Unit on.
Signal Low (Unit On)
-0.3 V
-
0.3 V
Signal High (Unit Off)
1.5 V
-
5.8 V
VRBC-16F1AL & VRBC-16F1AW;
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/16A Output
Efficiency Data
80.0%
82.0%
84.0%
86.0%
88.0%
90.0%
92.0%
94.0%
96.0%
98.0%
1.6
4.0
8.0
12.0
16.0
4.5V
5.0V
5.5V
Vo=3.3 V
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
1.6
4.0
8.0
12.0
16.0
2.4V
5.0V
5.5V
Vo=1.8 V
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
1.6
4.0
8.0
12.0
16.0
2.4V
5.0V
5.5V
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
NON-ISOLATED DC/DC CONVERTERS
2.4 V - 5.5 V Input
0.75 V - 3.63 V/16A Output
Thermal Derating Curves
Vo=3.3 V
Vo=1.8 V
Vo=0.7525 V
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