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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/6 A Output
Non-Isolated
Under-voltage
Lockout
(UVLO)
High
Efficiency
OCP/SCP
High Power Density
Wide
Input
Excellent Thermal Performance
Wide
Trim
Range
Low
Cost
Active Low/High (option)
Remote
On/Off
Flexible Output Voltage
Sequencing
Able to Sink & Source Current
Fixed Frequency (300 kHz)
Description
The Bel SRBA-06F2Ax modules are a series of non-isolated dc-dc converters that deliver up to 6 A 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
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%
SRBA-06F2AL
SRBA-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" 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
-
5.5 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. SRBA-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 the sequencing feature is not used, tie the SEQ pin to Vin.
SRBA-06F2Ax 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=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=1.5 V
Vo=1.2 V
Vo=0.75 V
-
-
-
-
-
-
-
-
-
-
-
-
4.73 A
5.49 A
5.11 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 1uH, 5 Hz to 20 MHz.
I
2
t Inrush Current Transient
-
-
0.04A
2
s
Turn-on Voltage Threshold
-
2.05 V
2.4V
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=0%~50% full load;
Io=50%~100% full load
Line Regulation
-
0.3%Vo,set
-
Vin=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
0A - 6
A
Current Limit Threshold
9A
-
18 A
Hiccup mode
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 &
1uF/10 V ceramic capacitor
at output
Turn on Time
-
6 mS
10 mS
Overshoot at Turn on
-
0%
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 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 6,954,974
hours
Calculated Per Bell Core SR-332 (I
O
=
Nominal; T
a
= 25
C)
Dimensions
Inches (L W H)
Millimeters (L W H)
0.8 x 0.45 x 0.25
20.32 x 11.42 x 6.36
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
Active High: SRBA-06F2A0; 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
Active Low: SRBA-06F2AL; Remote On/Off
pin open, Unit on.
Sequencing Voltage
0 V
-
Vin
Sequencing Voltage applied on SEQ pin
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
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
TrimUp
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
TrimUp
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
Vo=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=1.5 V
Vo=1.2 V
Vo=0.7525 V
3.3V Module
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.6A
1.5A
3.0A
4.5A
6.0A
Output Current
E
f
f
i
ci
e
n
cy
4.5V
5V
5.5V
2.5V Module
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.6A
1.5A
3.0A
4.5A
6.0A
Output Current
E
f
f
i
ci
en
c
y
3V
5V
5.5V
1.8V Module
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.6A
1.5A
3.0A
4.5A
6.0A
Output Current
E
f
f
i
ci
en
c
y
3V
5V
5.5V
1.5V Module
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.6A
1.5A
3.0A
4.5A
6.0A
Output Current
E
f
f
i
ci
en
cy
3V
5V
5.5V
1.2V Module
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.6A
1.5A
3.0A
4.5A
6.0A
Output Current
E
f
f
i
ci
en
cy
3V
5V
5.5V
0.7525V Module
60.0%
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
100.0%
0.6A
1.5A
3.0A
4.5A
6.0A
Output Current
E
f
f
i
ci
en
cy
3V
5V
5.5V
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=5.0 V, Vo=3.3 V
Vin=5.0 V, Vo=0.75 V
Vin=3.3 V, Vo=2.5 V
Vin=3.3 V, Vo=0.75 V
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