NON-ISOLATED DC/DC CONVERTERS
3.0 Vdc - 5.5 Vdc Input
1.0 Vdc - 3.3 Vdc/12 A Output
xRAH-12Fxx0 Series
•
•
•
•
•
Non-Isolated
Fixed frequency (300 kHz)
RoHS Compliant
•
OCP/SCP
Rev.A
•
Trim function (Option)
•
Remote On/Off
•
Remote Sense (SMD module)
Low profile package (7.82 mm)
Under-voltage lockout (UVLO)
UL60950-1 Recognized (UL/cUL)
Description
The Bel xRAH-12Fxx0 series are part of the low cost non-isolated dc/dc converter series. These converters are
available in a range of output voltages from 1.0 Vdc to 3.3 Vdc. It is packaged in a compact, overmolded
package rated at 12 A. The output is closely regulated and the efficiency of 3.3 Vdc output module is typically
93% at full load. Typical features include remote on/off, input under voltage lockout, over current protection and
short circuit protection.
Part Selection
Output
Voltage
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
1.0 V
Input Voltage
4.5 V - 5.5 V
3.6 V - 5.5 V
3.0 V - 5.5 V
3.0 V - 5.5 V
3.0 V - 5.5 V
3.0 V - 5.5 V
Max. Output
Current
12 A
12 A
12 A
12 A
12 A
12 A
Max. Output
Power
39.6 W
30.0 W
21.6 W
18.0 W
14.4 W
12.0 W
Typical
Efficiency
93%
89%
87%
84%
82%
80%
Part Number
Surface Mount
SRAH-12F330
SRAH-12F250
SRAH-12F180
SRAH-12F150
SRAH-12F120
SRAH-12F100
Part Number
Vertical Mount
VRAH-12F330
VRAH-12F250
VRAH-12F180
VRAH-12F150
VRAH-12F120
VRAH-12F100
Notes:
1. Add “0” suffix at the end of the model number to indicate “Tube Packaging”, and “R” for “Reel
Packaging”, and “G” for “Tray Packaging”.
2. 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
6V
7V
85
°C
125
°C
Notes
Input Specifications
Parameter
Input Voltage
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8-1.0 V
Input Current (no load)
Input Current (full load)
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=1.0 V
Remote Off Input Current
4.5 V
3.6 V
3.0 V
-
-
-
-
-
-
-
-
-
-
-
120 mA
-
-
-
-
-
-
2 mA
5.5 V
5.5 V
5.5 V
200 mA
11 A
10.5 A
9.0 A
8.1 A
6.5 A
5.2 A
5 mA
Min
Typ
Max
Notes
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
3.0 Vdc - 5.5 Vdc Input
Parameter
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
1.0 Vdc - 3.3 Vdc/12 A Output
Min
-
-
-
-
Typ
260 mA
75 mA
0.09 A s
2.1 V
2V
2
Input Specifications (continued)
Max
320 mA
120 mA
0.2 A s
-
2.4 V
2
Notes
With simulated source impedance of
500 nH, 5 Hz to 20 MHz; use a
270 uF/6.3 V cap with ESR=0.03 ohm
max at 100 kHz
Note:
All specifications are typical at 25
°C
unless otherwise stated.
Output Specifications
Parameter
Output Voltage Set Point
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=1.0 V
Line Regulation
Load Regulation
Regulation Over Temperature
(-40
°C
to +85
°C)
Min
3.234 V
2.450 V
1.764 V
1.470 V
1.176 V
0.980 V
-
-
-
-
-
-
-
-
0A
20 A
-
-
-
-
-
330 uF
-
-
-
-
-
-
-
-
-
-
-
-
Typ
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
1.0 V
±1
mV
±2
mV
±10
mV
±9
mV
±7
mV
±6
mV
±5
mV
±4
mV
-
-
2
0.3 A s
12 mV
50 mV
5 mS
0%
-
110 mV
40 uS
110 mV
40 uS
100 mV
30 uS
100 mV
30 uS
90 mV
20 uS
90 mV
20 uS
Max
3.366 V
2.550 V
1.836 V
1.530 V
1.224 V
1.020 V
±4
mV
±5
mV
±15
mV
±13
mV
±12
mV
±11
mV
±10
mV
±9
mV
12 A
30 A
2
0.6 A s
21 mV
90 mV
10 mS
3%
4800 uF
150 mV
80 uS
150 mV
80 uS
150 mV
60 uS
150 mV
60 uS
130 mV
40 uS
130 mV
40 uS
Test conditions:
0-20 MHz BW; 1 uF ceramic
capacitor and 330 uF external
capacitor at the output.
Notes
Test conditions:
Vin=5 V, Io= 50% load
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=1.0 V
Output Current
Current Limit Threshold
Short Circuit Surge Transient
Ripple and Noise (rms)
Ripple and Noise (pk-pk)
Turn on Time
Overshoot at Turn on
Output Capacitance
Transient Response
Overshoot
50% ~ 100%
Max Load
Settling Time
Overshoot
100% ~ 50%
Max Load
Settling Time
Overshoot
50% ~ 100%
Max Load
Settling Time
Overshoot
100% ~ 50%
Max Load
Settling Time
Overshoot
50% ~ 100%
Max Load
Settling Time
Overshoot
100% ~ 50%
Max Load
Settling Time
V
O
=3.3 V
V
O
=2.5 V
Test conditions:
di/dt=0.5A/us, Vin=5V, with
330uF external load
capacitance.
V
O
=1.0 V -
1.8 V
Note:
All specifications are typical at 5 V 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
3.0 Vdc - 5.5 Vdc Input
1.0 Vdc - 3.3 Vdc/12 A Output
General Specifications
Parameter
Efficiency
V
O
=3.3 V
V
O
=2.5 V
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=1.0 V
Efficiency
V
O
=1.8 V
V
O
=1.5 V
V
O
=1.2 V
V
O
=1.0 V
Switching Frequency
Output Trim Range
Remote Sense Compensation
MTBF
Dimensions (surface mount)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Dimensions (vertical)
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
-
85%
81%
79%
76%
250 kHz
90%V
O
-
88%
84%
82%
79%
300 kHz
-
-
4,038,174 hours
0.78 x 0.70 x 0.32
19.81 x 17.78 x 8.128
0.70 x 0.308 x 0.65
17.78 x 7.82 x 16.51
5.1 g
-
-
-
-
-
350 kHz
110%V
O
10%
SMD module
Calculated Per Bell Core SR-332 (I
O
= 9.6 A, Vin=5 V; T
a
= 25
°C)
Vin=3.3 V, full load
90%
86%
84%
81%
79%
77%
93%
89%
87%
84%
82%
80%
-
-
-
-
-
-
Vin=5 V, full load
Min
Typ
Max
Notes
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit Off)
Min
-
-
-
2.1 V (Vin=3.0 V)
Signal High (Unit On)
3.15 V (Vin=4.5 V)
3.85 V (Vin=5.5 V)
Typ
-
-
-
-
-
-
Max
0.9 V (Vin=3.0 V)
1.35 V (Vin=4.5 V)
1.65 V (Vin=5.5 V)
-
-
-
Remote on/off pin open, unit on.
Notes
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
3.0 Vdc - 5.5 Vdc Input
1.0 Vdc - 3.3 Vdc/12 A Output
Output Trim Equations
Equations for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) and the nominal
output voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between
the Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of
the resistors should be used for any given application.
R
TrimDown
=
A
−
B
V
nom
−
V
adj
Vout
Rtrimdown
Module
Trim
GND
R
TrimUp
=
V
adj
C
−
D
−
V
nom
Vout
Module
Trim
Rtrimup
GND
Vnom
3.3
2.5
1.8
1.5
1.2
1.0
A
161.391
111.674
68.576
50.000
31.240
18.850
B
161.900
208.900
287.900
287.900
208.900
161.900
C
43.330
43.330
43.330
43.330
43.330
43.330
D
100.000
147.000
226.000
226.000
147.000
100.000
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
3.0 Vdc - 5.5 Vdc Input
1.0 Vdc - 3.3 Vdc/12 A Output
Efficiency Data
Efficiency Curve
94.00%
92.00%
90.00%
88.00%
Efficiency Curve
98.00%
96.00%
94.00%
92.00%
Efficiency
90.00%
88.00%
86.00%
84.00%
82.00%
80.00%
78.00%
1
2
3
4
5
6
7
8
9
10 11 12
Output Current (A)
4.5 V
5.0 V
5.5 V
Efficiency
86.00%
84.00%
82.00%
80.00%
78.00%
76.00%
74.00%
1
2
3
4
5
6
7
8
9
10 11 12
Output Current (A)
3.6 V
4.5 V
5.5 V
xRAH-12F330
Efficiency Curve
94.00%
92.00%
90.00%
88.00%
86.00%
84.00%
82.00%
80.00%
78.00%
76.00%
74.00%
72.00%
70.00%
1
2
3
4
5
6
7
8
9
10 11 12
Output Current (A)
xRAH-12F250
Efficiency Curve
92.00%
90.00%
88.00%
86.00%
84.00%
82.00%
80.00%
78.00%
76.00%
74.00%
72.00%
70.00%
1
2
3
4
5
6
7
8
9
10 11 12
Output Current (A)
3.0 V
3.3 V
5.0 V
5.5 V
Efficiency
3.0 V
3.3 V
5.0 V
5.5 V
xRAH-12F180
Efficiency Curve
92.00%
90.00%
88.00%
86.00%
84.00%
82.00%
80.00%
78.00%
76.00%
74.00%
72.00%
70.00%
1
2
3
4
5
6
7
8
9
10 11 12
Output Current (A)
90.00%
88.00%
86.00%
84.00%
82.00%
80.00%
78.00%
76.00%
74.00%
72.00%
70.00%
68.00%
1
2
3
Efficiency
xRAH-12F150
Efficiency Curve
Efficiency
3.0 V
3.3 V
5.0 V
5.5 V
Efficiency
3.0 V
3.3 V
5.0 V
5.5 V
4
5
6
7
8
9
10 11 12
Output Current (A)
xRAH-12F120
xRAH-12F100
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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