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
• Non-Isolated • OCP/SCP
• Fixed frequency (300 kHz) • Trim function (Option)
• Low profile package (7.82 mm) • Remote On/Off
• Under-voltage lockout (UVLO)
• UL60950-1 Recognized (UL/cUL)
• Remote Sense (SMD module)
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 Input Voltage Max. Output
Current Max. Output
Power Typical
Efficiency Part Number
Surface Mount Part Number
Vertical Mount
3.3 V 4.5 V - 5.5 V 12 A 39.6 W 93% SRAH-12F330 VRAH-12F330
2.5 V 3.6 V - 5.5 V 12 A 30.0 W 89% SRAH-12F250 VRAH-12F250
1.8 V 3.0 V - 5.5 V 12 A 21.6 W 87% SRAH-12F180 VRAH-12F180
1.5 V 3.0 V - 5.5 V 12 A 18.0 W 84% SRAH-12F150 VRAH-12F150
1.2 V 3.0 V - 5.5 V 12 A 14.4 W 82% SRAH-12F120 VRAH-12F120
1.0 V 3.0 V - 5.5 V 12 A 12.0 W 80% SRAH-12F100 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 Min Typ Max Notes
Input Voltage (continuous) -0.3 V - 6 V
Output Enable Terminal Voltage -0.3 V - 7 V
Ambient Temperature -40 °C - 85 °C
Storage Temperature -55 °C - 125 °C
Input Specifications
Parameter Min Typ Max Notes
Input Voltage
VO=3.3 V
VO=2.5 V
VO=1.8-1.0 V
4.5 V
3.6 V
3.0 V
-
-
-
5.5 V
5.5 V
5.5 V
Input Current (no load) - 120 mA 200 mA
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=1.0 V
-
-
-
-
-
-
-
-
-
-
-
-
11 A
10.5 A
9.0 A
8.1 A
6.5 A
5.2 A
Remote Off Input Current - 2 mA 5 mA
xRAH-12Fxx0 Series RoHS Com
p
liant Rev.A
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
Input Specifications (continued)
Parameter Min Typ Max Notes
Input Reflected Ripple Current (pk-pk) - 260 mA 320 mA
Input Reflected Ripple Current (rms) - 75 mA 120 mA
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
I2t Inrush Current Transient - 0.09 A2s0.2 A
2s
Turn on Voltage Threshold 2.1 V -
Turn off Voltage Threshold - 2 V 2.4 V
Note: All specifications are typical at 25 °C unless otherwise stated.
Output Specifications
Parameter Min Typ Max Notes
Output Voltage Set Point
VO=3.3 V
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=1.0 V
3.234 V
2.450 V
1.764 V
1.470 V
1.176 V
0.980 V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
1.0 V
3.366 V
2.550 V
1.836 V
1.530 V
1.224 V
1.020 V
Test conditions:
Vin=5 V, Io= 50% load
Line Regulation - ±1 mV ±4 mV
Load Regulation - ±2 mV ±5 mV
Regulation Over Temperature
(-40 °C to +85 °C) VO=3.3 V
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=1.0 V
-
-
-
-
-
-
±10 mV
±9 mV
±7 mV
±6 mV
±5 mV
±
4mV
±15 mV
±13 mV
±12 mV
±11 mV
±10 mV
±
9mV
Output Current 0 A - 12 A
Current Limit Threshold 20 A - 30 A
Short Circuit Surge Transient - 0.3 A2s 0.6 A2s
Ripple and Noise (rms) - 12 mV 21 mV
Ripple and Noise (pk-pk) - 50 mV 90 mV
Test conditions:
0-20 MHz BW; 1 uF ceramic
capacitor and 330 uF external
capacitor at the output.
Turn on Time - 5 mS 10 mS
Overshoot at Turn on - 0% 3%
Output Capacitance 330 uF - 4800 uF
Transient Response
Overshoot - 110 mV 150 mV
50% ~ 100%
Max Load Settling Time - 40 uS 80 uS
Overshoot - 110 mV 150 mV
100% ~ 50%
Max Load Settling Time
VO=3.3 V
- 40 uS 80 uS
Overshoot - 100 mV 150 mV
50% ~ 100%
Max Load Settling Time - 30 uS 60 uS
Overshoot - 100 mV 150 mV
100% ~ 50%
Max Load Settling Time
VO=2.5 V
- 30 uS 60 uS
Overshoot - 90 mV 130 mV
50% ~ 100%
Max Load Settling Time - 20 uS 40 uS
Overshoot - 90 mV 130 mV
100% ~ 50%
Max Load Settling Time
VO=1.0 V -
1.8 V
- 20 uS 40 uS
Test conditions:
di/dt=0.5A/us, Vin=5V, with
330uF external load
capacitance.
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 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=1.0 V
90%
86%
84%
81%
79%
77%
93%
89%
87%
84%
82%
80%
-
-
-
-
-
-
Vin=5 V, full load
Efficiency
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=1.0 V
85%
81%
79%
76%
88%
84%
82%
79%
-
-
-
-
Vin=3.3 V, full load
Switching Frequency 250 kHz 300 kHz 350 kHz
Output Trim Range 90%VO - 110%VO
Remote Sense Compensation - - 10% SMD module
MTBF 4,038,174 hours Calculated Per Bell Core SR-332 (IO
= 9.6 A, Vin=5 V; Ta = 25 °C)
Dimensions (surface mount)
Inches (L × W × H)
Millimeters
(
L × W × H
)
0.78 x 0.70 x 0.32
19.81 x 17.78 x 8.128
Dimensions (vertical)
Inches (L × W × H)
Millimeters
(
L × W × H
)
0.70 x 0.308 x 0.65
17.78 x 7.82 x 16.51
Weight - 5.1 g -
Control Specifications
Parameter Min Typ Max Notes
Remote On/Off
- - 0.9 V (Vin=3.0 V)
- - 1.35 V (Vin=4.5 V)
Signal Low (Unit Off)
- - 1.65 V (Vin=5.5 V)
2.1 V (Vin=3.0 V) - -
3.15 V (Vin=4.5 V) - -
Signal High (Unit On)
3.85 V (Vin=5.5 V) - -
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
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.
B
VV A
R
adjnom
TrimDown −
−
=
D
VV C
R
nomadj
TrimUp −
−
=
Vnom A B C D
3.3 161.391 161.900 43.330 100.000
2.5 111.674 208.900 43.330 147.000
1.8 68.576 287.900 43.330 226.000
1.5 50.000 287.900 43.330 226.000
1.2 31.240 208.900 43.330 147.000
1.0 18.850 161.900 43.330 100.000
Module
Vout
Trim
GND
Rtrimdown
Module
Vout
Trim
GND Rtrimu p
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
78.00%
80.00%
82.00%
84.00%
86.00%
88.00%
90.00%
92.00%
94.00%
96.00%
98.00%
123456789101112
Output Curren t (A)
Efficiency
4.5 V
5.0 V
5.5 V
Efficie nc y Curve
74.00%
76.00%
78.00%
80.00%
82.00%
84.00%
86.00%
88.00%
90.00%
92.00%
94.00%
123456789101112
Output Current (A)
Efficiency
3.6 V
4.5 V
5.5 V
xRAH-12F330 xRAH-12F250
Efficiency Curve
70.00%
72.00%
74.00%
76.00%
78.00%
80.00%
82.00%
84.00%
86.00%
88.00%
90.00%
92.00%
94.00%
123456789101112
Output Current (A)
Efficiency
3.0 V
3.3 V
5.0 V
5.5 V
Efficiency Curve
70.00%
72.00%
74.00%
76.00%
78.00%
80.00%
82.00%
84.00%
86.00%
88.00%
90.00%
92.00%
123456789101112
Output Current (A )
Efficiency
3.0 V
3.3 V
5.0 V
5.5 V
xRAH-12F180 xRAH-12F150
Efficiency Curve
70.00%
72.00%
74.00%
76.00%
78.00%
80.00%
82.00%
84.00%
86.00%
88.00%
90.00%
92.00%
123456789101112
Output Current (A)
Efficiency
3. 0 V
3. 3 V
5. 0 V
5. 5 V
Efficiency Curve
68.00%
70.00%
72.00%
74.00%
76.00%
78.00%
80.00%
82.00%
84.00%
86.00%
88.00%
90.00%
123456789101112
Output Current (A)
Efficiency
3.0 V
3.3 V
5.0 V
5.5 V
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
NON-ISOLATED DC/DC CONVERTERS
3.0 Vdc - 5.5 Vdc Input 1.0 Vdc - 3.3 Vdc/12 A Output
Thermal Derating Curves
SRAH-12F330 VRAH-12F330
SRAH-12F250 VRAH-12F250
SRAH-12F180 VRAH-12F180
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
Thermal Derating Curves (continued)
SRAH-12F150 VRAH-12F150
SRAH-12F120 VRAH-12F120
SRAH-12F100 VRAH-12F100
Test Condition: Derating curves are tested at 5 V input.
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
Ripple and Noise Waveforms
5 Vdc Input, 3.3 Vdc Output 5 Vdc Input 2.5 Vdc Output
3.3 Vdc Input, 1.8 Vdc Output 5 Vdc Input 1.8 Vdc Output
3.3 Vdc Input, 1.5 Vdc Output 5 Vdc Input 1.5 Vdc Output
3.3 Vdc Input, 1.2 Vdc Output 5 Vdc Input 1.2 Vdc Output
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
Ripple and Noise Waveforms (continued)
3.3 Vdc Input, 1.0 Vdc Output 5 Vdc Input 1.0 Vdc Output
Note: Ripple and Noise at full load, with 1 uF ceramic capacitor and a 330 uF tantalum capacitor at the output,
Ta=25 deg C.
Transient Response Waveforms
50% to 100% load 5.0 Vdc Input 3.3 Vdc Output 100% to 50% load 5.0 Vdc Input 3.3 Vdc Output
50% to 100% load 5.0 Vdc Input 2.5 Vdc Output 100% to 50% load 5.0 Vdc Input 2.5 Vdc Output
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
Transient Response Waveforms (continued)
50% to 100% load 3.3 Vdc Input 1.8 Vdc Output 100% to 50% load 3.3 Vdc Input 1.8 Vdc Output
50% to 100% load 5 Vdc Input 1.8 Vdc Output 100% to 50% load 5 Vdc Input 1.8 Vdc Output
50% to 100% load 3.3 Vdc Input 1.5 Vdc Output 100% to 50% load 3.3 Vdc Input 1.5 Vdc Output
50% to 100% load 5 Vdc Input 1.5 Vdc Output 100% to 50% load 5 Vdc Input 1.5 Vdc Output
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
Transient Response Waveforms (continued)
50% to 100% load 3.3 Vdc Input 1.2 Vdc Output 100% to 50% load 3.3 Vdc Input 1.2 Vdc Output
50% to 100% load 5 Vdc Input 1.2 Vdc Output 100% to 50% load 5 Vdc Input 1.2 Vdc Output
50% to 100% load 3.3 Vdc Input 1.0 Vdc Output 100% to 50% load 3.3 Vdc Input 1.0 Vdc Output
50% to 100% load 5 Vdc Input 1.0 Vdc Output 100% to 50% load 5 Vdc Input 1.0 Vdc Output
Note: Transient response at di/dt=0.5 A/uS, with external load capacitance = 330 uF, Ta=25 deg C.
©
2007 Bel Fuse Inc. Specifications subject to change without notice. 010507
CORPORATE FAR EAST EUROPE
Bel Fuse Inc. Bel Fuse Ltd. Bel Fuse Europe Ltd.
206 Van Vorst Street 8F/ 8 Luk Hop Street Preston Technology Management Centre
Jersey City, NJ 07302 San Po Kong Marsh Lane, Suite G7, Preston
Tel 201-432-0463 Kowloon, Hong Kong Lancashire, PR1 8UD, U.K.
Fax 201-432-9542 Tel 852-2328-5515 Tel 44-1772-556601
www.belfuse.com Fax 852-2352-3706 Fax 44-1772-888366
www.belfuse.com www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
3.0 Vdc - 5.5 Vdc Input 1.0 Vdc - 3.3 Vdc/12 A Output
Mechanical Outline
SRAH-12Fxx0
VRAH-12Fxx0
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and
other hazardous substances from electronic products. These parts are not however
compatible with the higher temperatures associated with lead free solder processes and
must be soldered using a reflow profile with a peak temperature of no more than 240 ºC.
bel
Pin Connections
Pin Function
1 Remote On/Off (option)
2 Vin
3 Ground
4 Vout
5 Trim (option)
6 Sense (option)
7 N/A
Pin Connections
Pin Function
1 Remote On/Off (option)
2 Vin
3 Ground
4 Vout
5 Trim (option)
bel
bel
