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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/16 A Output
Non-Isolated
Under-voltage Lockout (UVLO)
High
Efficiency
Over
Temperature
Protection
High
Power
Density
Wide
Input
Range
Fixed Frequency (300 kHz)
Wide Trim Range
OCP/SCP
Remote
Sense
Flexible Output Voltage
Sequencing
Converter can sink and source
current
Remote
On/Off
Active
Low/High
(option)
Description
The Bel SRBC-16F2Ax modules are a series of non-isolated dc/dc converters that 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 (2.4-5.5 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,
remote sense, over current protection, short current 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
Model
Number
Active Low
0.75 V-3.63 V
1
2.4 V-5.5 V
16 A
58.1 W
94%
SRBC-16F2AL
SRBC-16F2A0 SRBC-16F2AW
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
Sequencing Voltage
1
-0.3
V
-
Vin
Ambient Temperature
-40
C
-
85
C
Storage Temperature
-55
C
-
125
C
Notes
: All specifications are typical at 25
C
unless otherwise stated.
1. SRBC-16F2Ax 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 the sequencing feature is not used, tie the SEQ pin to Vin.
SRBC-16F2Ax 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/16 A Output
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=3.3V
Vo=2.5V
Vo=1.8V
Vo=1.5V
Vo=1.2V
Vo=0.75V
-
-
-
-
-
-
11.23 A
8.70 A
6.40 A
5.45 A
4.52 A
3.05 A
15.10 A
14.81 A
13.64 A
11.76 A
9.64 A
6.69 A
Input Current (no load)
-
80 mA
-
Remote Off Input Current
-
10 mA
22 mA
Input Reflected Ripple Current (pk-pk)
-
100 mA
-
Input Reflected Ripple Current (rms)
-
40 mA
-
Tested with two 100uF/10V 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
-
1.6A
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
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/16 A Output
Output Specifications (continued)
Parameter
Min
Typ
Max
Notes
Transient Response
50% ~ 100% Max Load
-
300 mV
-
Settling Time
-
50 uS
-
100% ~ 50% Max Load
-
300 mV
-
Settling Time
All
- 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
50% ~ 100% Max Load
-
150 mV
-
Settling Time
-
100 uS
-
100% ~ 50% Max Load
-
150 mV
-
Settling Time
All
- 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.
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
92%
90%
88%
85%
82%
76%
94%
92%
90%
88%
85%
79%
-
-
-
-
-
-
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%
MTBF 5,438,000
hours
Calculated Per Bell Core SR-332 (I
O
=
Nominal; T
a
= 25
C)
Dimensions
Inches (L W H)
Millimeters (L W H)
1.30 x 0.53 x 0.315
33.02 x 13.46 x 8.00
Weight -
6.6
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
SRBC-16F2A0; 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
SRBC-16F2AL & SRBC-16F2AW; Remote
On/Off pin open, Unit on.
Sequencing Voltage
0.05V
-
Vin
Sequencing Voltage should be higher than
output voltage.
Sequencing Slew Rate Capability
-
-
2 V/mS
Sequencing Delay Time
10 mS
-
-
Delay from Vin, min to application of voltage
on SEQ pin
Tracking Accuracy
Power-Up
Power-Down
-
-
100 mV
200 mV
200 mV
400 mV
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/16 A Output
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/16 A Output
Efficiency Data
Vo=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=1.5 V
Vo=1.2 V
Vo=0.7525 V
80.0%
82.0%
84.0%
86.0%
88.0%
90.0%
92.0%
94.0%
96.0%
98.0%
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
4.5V
5V
5.5V
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
3.0V
3.3V
5V
5.5V
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
1
2
3
4
5
6
7
8
9
10
11 12
13
14 15
16
3V
3.3
5V
5.5V
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
1
2
3
4
5
6
7
8
9
10 11
12
13
14 15
16
3V
3.3V
5V
5.5V
50.0%
55.0%
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
1
2
3
4
5
6
7
8
9
10
11
12
13 14
15
16
3V
3.3V
5V
5.5
45.0%
50.0%
55.0%
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
3V
3.3V
5V
5.5V
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