NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input
0.75 Vdc - 3.63 Vdc/3 A Output
SRBA-03F1Ax
•
•
•
•
•
Non-Isolated
High Efficiency
High Power Density
RoHS Compliant
•
•
•
•
OCP/SCP
Rev.A
Remote On/Off
Wide Trim Range
Under-voltage Lockout (UVLO)
Fixed Frequency (300 kHz)
Converter Can Sink and Source
Current
Description
The Bel SRBA-03F1Ax modules are a series of non-isolated dc/dc converters that deliver up to 3 A of output
current with full load efficiency of 94% at 3.3 Vdc output. These modules provide precisely regulated voltage
programmable via external resistor from 0.75 Vdc to 3.63 Vdc over a wide range of input voltage (2.4 Vdc - 5.5
Vdc). 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, under-
voltage lockout, over temperature protection 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
3A
Max. Output
Power
10 W
Typical
Efficiency
94%
Model Number
Active Low
SRBA-03F1AL
Model Number
Active High
SRBA-03F1A0
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.
3. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
Absolute Maximum Ratings
Parameter
Input Voltage (continuous)
Output Enable Terminal Voltage
Ambient Temperature
Storage Temperature
Min
-0.3 V
-0.3 V
-40
°C
-55
°C
Typ
-
-
-
-
Max
5.8 V
5.5 V
85
°C
125
°C
Notes
Note:
All specifications are typical 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 Vdc - 5.5 Vdc Input
0.75 Vdc - 3.63 Vdc/3 A Output
Min
2.4 V
Vo=3.3 V
Vo=2.5 V
Vo=2.0 V
Vo=1.8 V
Vo=1.5 V
Vo=1.2 V
Vo=0.75 V
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
Input Specifications
Parameter
Input Voltage
Input Current (full load)
Typ
-
2.11 A
1.61 A
1.32 A
1.20 A
1.01 A
0.83 A
0.55 A
32 mA
20 mA
4 mA
60 mA
18 mA
-
2.05 V
2.0 V
Max
5.5 V
-
-
-
-
-
-
-
-
-
-
-
-
0.04 A s
2.4 V
-
2
Notes
Vo, set
≤
Vin-0.5 V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1.7 V
Tested with simulated source
impedance of 1 uH, 5 Hz to 20 MHz.
Note:
All specifications are typical at nominal input, full load at 25
°C
unless otherwise stated.
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)
Turn on Time
Overshoot at Turn on
Output Capacitance
ESR
≥
1mohm
ESR
≥
10mohm
Transient Response
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
V
O
=
0.75 V -3.63 V
-
-
-
-
150 mV
40 uS
150 mV
40 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
Min
-2%Vo,set
-3%Vo,set
0.7525 V
-
-
-
0A
4A
-
-
-
-
-
0 uF
0 uF
Typ
-
-
-
0.2%Vo,set
0.2%Vo,set
0.4%Vo,set
-
-
0.32 A s
30 mV
10 mV
8 mS
-
-
-
2
Max
2%Vo,set
3%Vo,set
3.63 V
-
-
-
3A
9.5 A
-
50 mV
15 mV
12 mS
3%
1000 uF
3000 uF
Notes
Vin=5 V, 50% full load
Over all operating input voltage,
resistive load and temperature
conditions until end of life.
Io=Iomin to 50% Iomax
Vin=Vinmin to Vinmax
Tested with 0-20 MHz, with
10 uF tantalum capacitor & 1 uF/
10 V 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 Vdc - 5.5 Vdc Input
0.75 Vdc - 3.63 Vdc/3 A Output
General Specifications
Parameter
Efficiency
Vo=3.3 V
Vo=2.5 V
Vo=2.0 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
-
0.8 x 0.45 x 0.27
20.32 x 11.42 x 6.87
5g
-
-
-
-
-
-
-
-
250 kHz
-
0.7525 V
94%
93%
91%
90%
89%
87%
81.5%
300 kHz
135
°C
-
8,798,829 hours
-
-
-
-
-
-
-
350 kHz
-
3.63 V
Calculated Per Bell Core SR-332 (Vin=5
V; Vo=1.8 V, I
O
= 2.4 A; T
a
= 25
°C)
Min
Typ
Max
Notes
Measured at Vin=5 V, full load
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)
-0.2 V
-
-0.2 V
1.5 V
-
-
-
-
0.3 V
Vin, max
0.3 V
Vin, max
Active High: SRBA-03F1A0; Remote On/Off
pin open, Unit on.
Min
Typ
Max
Notes
Active Low: SRBA-03F1AL; Remote On/Off
pin open, Unit on.
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 Vdc - 5.5 Vdc Input
0.75 Vdc - 3.63 Vdc/3 A Output
Remote Enable Specifications
The SRBA-03F1AL modules feature an enable
pin with negative logic. If not using the enable
pin, leave the pin open (the module will be on).
During logic_high, the module is turned off,
during logic_low, the module is turned on. It inner
circuit impedance is showed as figure.
SRBA-03F1AL
The SRBA-03F1A0 modules feature an enable
pin with Positive logic. If not using the enable pin,
leave the pin open (the module will be on).
During logic_high, the module is turned on,
during logic_low, the module is turned off. It inner
circuit impedance is showed as figure.
SRBA-03F1A0
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 Vdc - 5.5 Vdc Input
0.75 Vdc - 3.63 Vdc/3 A Output
Output Trim Equations
A:
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.
R
trim
21.07
=
−
5.11
V
adj
−
0.7525
Vout
Table 1
Vo (V)
0.7525
1.2
1.5
1.8
2.0
2.5
3.3
Rtrim (KΩ)
Open
41.973
23.077
15.004
11.779
6.947
3.16
Rtrim(kΩ)
200
180
160
140
120
100
80
60
40
20
Rtrim vs.Output Voltage
Module
Trim
Rtrim
GND
0
0.75 1.04 1.33 1.61 1.9 2.19 2.48 2.77 3.05 3.34 3.63
Output Voltage(V)
B:
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.
V
trim
=
0.7
−
0.1698
×
(
V
adj
−
0.7525)
Table 2
Vout
0.7
Vtrim vs. Output Voltage
Trim
Vtrim(V)
Module
Vtrim
GND
Vo (V)
0.7525
1.2
1.5
1.8
2.0
2.5
3.3
Vtrim (V)
Open
0.624
0.5731
0.5221
0.4882
0.4033
0.267
0.65
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.75 1.04 1.33 1.61
1.9
2.19 2.48
Vo(V)
2.77 3.05 3.34 3.63
C:
V
O
R
down
Rset
21.07
Vo
−
0.7525
−
5.11
KΩ
Rup
T
rim
R
set
GND
21.07
⋅
Rset
−
5.11
⋅
Vm_up
⋅
Rset
+
3.845
⋅
Rset
KΩ
Vm_up
⋅
Rset
+
5.11
⋅
Vm_up
−
0.753Rset
−
24.915
Margin up value after output voltage is set with Rset
R
up
Rdown
5.978
⋅
Vm_down
⋅
Rset
−
4.230
⋅
Rset
KΩ
0.128
⋅
Rset
−
0.868
⋅
Vm_down
−
0.170
⋅
Vm_down
⋅
Rset
+
4.230
Margin down value after output voltage is set with Rset
Vm_down
≥
90%Vo
Note:
Output voltage Vo=0.7525 V when Trim pin is not connected.
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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