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, -5 Vdc/1 A, -5.2 Vdc/1 A, -12 Vdc/0.5 A Outputs
• Non-Isolated • Low Cost
• Fixed Frequency • Excellent Thermal Performance
• High Efficiency
• High Power Density
• UL60950-1 Recognized (UL/cUL)
• OCP/SCP
• Industrial Temperature Range
Description
The Bel xRAH-01FxxN modules are non-isolated; step down dc/dc converters that operate from a 3 V - 5.5 V
source. Output voltages are -5.0 V, -5.2 V, and -12 V. They are packaged in a compact, overmolded package
rated at 1 A, 1 A, 0.5 A. O ptional lead forming provides a vertical mount product for minimal footprint or a surface
mount option for a very low pr ofile. The output is closely re gulated and the efficiency is typically 88% at 1 A, -5 V
output at full load.
Part Selection
Output
Voltage Input
Voltage Max. Output
Current Max. Output
Power Typical
Efficiency Part Number
Surface Mount Part Number
Vertical Mount
-5.0 V 3.0 V - 5.5 V 1 A 5 W 88% SRAH-01F50N VRAH-01F50N
-5.2 V 3.0 V - 5.5 V 1 A 5.2 W 88% SRAH-01F52N VRAH-01F52N
-12 V 3.0 V - 5.5 V 0.5 A 6 W 88% SRAH-01FX2N VRAH-01FX2N
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 - 7 V
Ambient Temperature -40 °C - 85 °C
Storage Temperature -40 °C - 125 °C
Input Specifications
Parameter Min Typ Max Notes
Input Voltage 3 V - 5.5 V
Input Current (full load)
VO= -5.0 V, -5.2 V
VO= -12 V
-
-
-
-
2.1 A
2.5 A
Input Current (no load)
VO= -5.0 V, -5.2 V
VO= -12 V
-
-
-
-
150 mA
200 mA
Input Reflected Ripple Current
(pk-pk) - 80 mA 160 mA
Input Reflected Ripple Current
(rms) - 20 mA 50 mA
For -5 V & -5.2 V output, use a 680uF/6.3
V Os-con capacitor; For -12 V output, use
1000 uF electrolytic capacitor & 22 uF/10
V ceramic capacitor at the input.
I2t Inrush Current Transient - - 0.01 A2s
Turn-on Voltage Threshold - 2.63 V -
Turn-off Voltage Threshold
VO= -5.0 V, -5.2 V
VO= -12 V
0.4 V
1.0 V
-
-
2.0 V
2.3 V
xRAH-01FxxN 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, -5 Vdc/1 A, -5.2 Vdc/1 A, -12 Vdc/0.5 A Outputs
Output Specifications
Parameter Min Typ Max Notes
Output Voltage Set Point VO= -5.0 V
VO= -5.2 V
VO= -12 V
-5.1 V
-5.304 V
-12.24 V
-5.0 V
-5.2 V
-12 V
-4.90 V
-5.096 V
-11.76 V
Vin=5.0 V, lout=half load; with 220 uF/10
V tantalum capacitor & 0.1 uF ceramic
capacitor (Vo= -5 V & -5.2 V) or two 47
uF/25 V tantalum capacitors & 0.1uF
ceramic capacitor (Vo= -12 V).
Line Regulation VO= -5.0 V, -5.2 V
VO= -12 V
-20 mV
-120 mV
-
-
20 mV
120 mV
Load Regulation VO= -5.0 V, -5.2 V
VO= -12 V
-60 mV
-120 mV
-
-
60 mV
120 mV
Regulation Over Temperature
(-40 °C to +85 °C) VO= -5.0 V, -5.2 V
VO= -12 V
-80 mV
-240 mV
-
-
80 mV
240 mV
Ripple and Noise (rms) VO= -5.0 V
Vo= -5.2 V
VO= -12 V
-
-
-
25 mV
25 mV
40 mV
40 mV
50 mV
70 mV
Ripple and Noise (pk-pk) VO= -5.0 V
Vo= -5.2 V
VO= -12 V
-
-
-
90 mV
100 mV
120 mV
120 mV
130 mV
240 mV
Test conditions:
BW = 0-20 MH z; wi th 2 20 uF/10 V tanta lum
capacitor & 0.1 uF ceramic capacitor (Vo= -
5 V & -5.2 V) or two 47 uF/25 V tantalum
capacitors & 0.1 uF ceramic capacitor (Vo=-
12 V).
Output Current Range
VO= -5.0 V, -5.2 V
VO= -12 V
0 A
0 A
-
-
1 A
0.5 A
Output DC Current Limit - 200% -
Short Circuit Surge Transient - - 0.01 A2s
Turn on Time - 10 mS 30 mS
Overshoot at Turn on - 0% 3%
Output Capacitance
VO= -5.0 V, -5.2 V
VO= -12 V
220 uF
100 uF
-
-
470 uF
150 uF
Transient Response
Overshoot - 80 mV -
50% ~ 10 0%
Max Load Settling Time - 40 uS -
Overshoot - 80 mV -
100% ~ 50%
Max Load Settling Time
Vo= -5.0 V,
-5.2 V
- 40 uS -
Overshoot - 130 mV -
50% ~ 10 0%
Max Load Settling Time - 50 uS -
Overshoot - 130 mV -
100% ~ 50%
Max Load Settling Time
VO= -12 V
- 50 uS -
Test Conditions:
di/dt = 0.1 A/uS; Vin = 5.0 V; Ta =
25°C and with 220 uF/10 V Tantalum
capacitor & 0.1 uF ceramic capacitor
(Vo= -5 V & -5.2 V) or two 47 uF/25 V
tantalum capacitors & 0.1 uF ceramic
capacitor (Vo=-12 V).
Note: All specifications are typical at nominal input, full load at 25 °C unless otherw ise sta te d.
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, -5 Vdc/1 A, -5.2 Vdc/1 A, -12 Vdc/0.5 A Outputs
General Specifications
Parameter Min Typ Max Notes
Efficiency 84% 88% - Vin=5 V; lo=lom ax
Switching Frequency 250 kHz 300 kHz 350 kHz
MTBF 4,883,163 hours Calculated Per Bell Core SR-332 (IO =
80%lomax; Ta = 25 °C)
Dimensions (surface mount)
Inches (L × W × H)
Millimeters
(
L × W × H
)
0.78 x 0.7 x 0.32
19.82 x 17.78 x 8.13 SRAH-01FxxN
Dimensions (vertical)
Inches (L × W × H)
Millimeters
(
L × W × H
)
0.7 x 0.308 x 0.65
17.78 x 7.82 x 16.51 VRAH-01FxxN
Weight - 4.9 g -
Note: All specifications are typical at 25 °C unless otherwise stated.
Thermal Derating Curve
xRAH-01F50N
Efficiency Data
MODULE -5V,-5.2V
55.0%
65.0%
75.0%
85.0%
95.0%
0.10 0.25 0.50 0.75 1.00
OUTPUT CURRENT
EFFICIENCY
3.3
5
5.5
M ODULE -12V
65.0%
70.0%
75.0%
80.0%
85.0%
90.0%
95.0%
0.050 0.125 0.250 0.375 0.500
OUTPUT CURRENT
EFFICIENC
Y
3.3V
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
3.0 Vdc - 5.5 Vdc Input, -5 Vdc/1 A, -5.2 Vdc/1 A, -12 Vdc/0.5 A Outputs
Ripple and Noise Waveforms
3.3 V input, -5 V output 5 V input, -5 V output
Note: Ripple and noise at full load, with a 220 uF/10 V tantalum capacitor and a 0.1uF ceramic capacitor at the
output, Ta=2 5 de g C .
3.3 V input, -12 V output 5 V input, -12 V output
Note: Ripple and noise at fu ll load, with a 2*47uF/25 V tantalum capacitor and a 0.1uF ceramic capacitor at the
output, Ta=2 5 de g C .
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, -5 Vdc/1 A, -5.2 Vdc/1 A, -12 Vdc/0.5 A Outputs
Transient Response Waveforms
50% to 100% load Transient at Vin=3.3 V, Vo=-5 V 100% to 50% load Transient at Vin=3.3 V, Vo=-5 V
50% to 100% load Transient at Vin=5 V, Vo=-5 V 100% to 50% load Transient at Vin=5 V, Vo=-5 V
Note: Transient Response at di/dt=0.1 A/uS, with a 220 uF/10 V tantalum capacitor and a 0.1uF ceramic
capacitor at the output, Ta=25 deg C.
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, -5 Vdc/1 A, -5.2 Vdc/1 A, -12 Vdc/0.5 A Outputs
Transient Response Waveforms (continued)
50% to 100% load Transient at Vin=3.3 V, Vo=-12 V 100% to 50% load Transient at Vin=3.3 V, Vo=-12 V
50% to 100% load Transient at Vin=5 V, Vo=-12 V 100% to 50% load Transient at Vin=5 V, Vo=-12 V
Note: Transient Response at di/dt=0.1 A/uS, with a 2*47uF/25Vtantalum capacitor and a 0.1uF ceramic capacitor
at the output, Ta=25 deg C.
©
2007 Bel Fuse Inc. Specifications subject to change without notice.011007
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, -5 Vdc/1 A, -5.2 Vdc/1 A, -12 Vdc/0.5 A utputs
Mechanical Outline
SRAH-01FxxN
VRAH-01FxxN
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.
Pin Connections
Pin Function
1 N/A
2 Vin
3 Ground
4 Vout
5 N/A
6 N/A
7 N/A
Pin Connections
Pin Function
1 N/A
2 Vin
3 Ground
4 Vout
5 N/A
