NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input
0.75 Vdc - 3.63 Vdc/10 A Output
SRBC-10F1Ax
•
•
•
•
•
•
Non-Isolated
High Efficiency
High Power Density
RoHS Compliant
•
•
•
•
•
•
•
Rev.A
Under-voltage Lockout (UVLO)
Over Temperature Protection
OCP/SCP
Wide Input
Wide Trim
Remote Sense
Active Low/High (Option)
Fixed Frequency (300 kHz)
Remote On/Off
Converter Can Sink and Source
Current
Description
The Bel SRBC-10F1Ax modules are a series of non-isolated dc/dc converters that deliver up to 10 A of output
current with full load efficiency of 95% 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. 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 current 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
10 A
Max. Output
Power
36 W
Typical
Efficiency
95%
Model Number
Active Low
SRBC-10F1AL
Model Number
Active High
SRBC-10F1A0
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
5.8 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/10 A Output
Input Specifications
Parameter
Input Voltage
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
Input Current (no load)
Remote Off Input Current
Input Reflected Ripple Current (pk-pk)
Min
2.4 V
-
-
-
-
-
-
-
-
-
Typ
-
7.0 A
5.5 A
4.0 A
3.5 A
3.0 A
2.0 A
80 mA
15 mA
140 mA
Max
5.5 V
8.0 A
9.5 A
9.0 A
7.5 A
6.0 A
4.0 A
-
-
-
With simulated source impedance of
1 uH, 5 Hz to 20 MHz and two 100 uF
/10 V external input Tantalum
capacitors at the input.
2
Notes
Vo, set
≤
Vin-0.5 V
Input Reflected Ripple Current (rms)
I t Inrush Current Transient
Turn-on Voltage Threshold
Turn-off Voltage Threshold
2
-
-
-
-
40 mA
-
2.2 V
2.0 V
-
0.2 A s
-
-
Note:
All specifications are typical at 25
°C
unless otherwise stated.
Output Specifications
Parameter
Output Voltage Set Point
Output Voltage Set Point
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
≥1
mohm
ESR
≥10
mohm
Min
-2% Vo,set
-3% Vo,set
-
-
-
0A
15 A
-
-
-
-
-
0 uF
0 uF
Typ
-
-
0.4% Vo,set
0.3% Vo,set
0.5% Vo,set
-
-
-
25 mV
8 mV
4 mS
0%
-
-
Max
2% Vo,set
3% Vo,set
-
-
-
10 A
27 A
1.5 A s
50 mV
15 mV
8 mS
3%
1000 uF
4700 uF
Tested with 0-20MHz, with
external 10uF/16V tantalum
capacitor & 1uF/10V TDK
ceramic capacitor
2
Notes
Vin=5 V, lo=lo max
Over all operating input
voltage, resistive load, and
temperature conditions
lo=lomin to lomax
Vin=Vinmin to Vinmax
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/10 A Output
Output Specifications (continued)
Parameter
Transient Response
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
Min
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ
130 mV
50 uS
150 mV
50 uS
130 mV
50 uS
130 mV
50 uS
120 mV
50 uS
120 mV
50 uS
120 mV
50 uS
120 mV
50 uS
130 mV
50 uS
130 mV
50 uS
120 mV
50 uS
140 mV
50 uS
Max
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Notes
V
O
= 3.3 V
V
O
= 2.5 V
V
O
= 1.8 V
V
O
= 1.5 V
di/dt=2.5 A/uS; Vin=5 V; and
with external 2
×
150 uF/16 V
Tantalum capacitors and 1 uF
/10 V ceramic capacitor at the
output
V
O
=1.2 V
V
O
= 0.75 V
Note:
All specifications are typical at nominal input, full load at 25
°C
unless otherwise stated.
General Specifications
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
Remote Sense Compensation
MTBF
Dimensions
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
-
1.3 x 0.53 x 0.315
33.02 x 13.46 x 8.00
6.6 g
-
92%
90%
88%
87%
85%
79%
250 kHz
-
0.7525 V
-
95%
93%
91%
90%
88%
82%
300 kHz
125
°C
-
10%
6,643,156 hours
-
-
-
-
-
-
350 kHz
-
3.63 V
-
Measured at Vin=5 V, full load
Min
Typ
Max
Notes
Total adjustment of trim, setpoint and
remote sense combined should not
exceed 3.63 V. Vo=0.7525 V when trim
pin open
Calculated Per Bell Core SR-332 (I
O
=
80% Io, max; Vo=1.8 V; Vin=5.0 V; T
a
=
25
°C)
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/10 A Output
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit Off)
Signal High (Unit On)
Signal Low (Unit On)
Signal High (Unit Off)
-0.3 V
1.5 V
-0.3 V
1.5 V
-
-
-
-
0.3 V
5.8 V
0.3 V
5.8 V
SRBC-10F1A0; Remote On/Off pin open, Unit
on.
SRBC-10F1AL; Remote On/Off pin open, Unit
on.
Min
Typ
Max
Notes
Remote Enable Specifications
The SRBC-10F1AL 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.
SRBC-10F1AL
The SRBC-10F1A0 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.
SRBC-10F1A0
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/10 A Output
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
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