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NON-ISOLATED DC/DC CONVERTERS
3.0 V-5.5 V Input 1.0 V-3.3 V/12 A Output
XRAH-12FXX0 Series
* * * * Non-Isolated Fixed frequency (300 kHz) Low profile package (7.82 mm) Under-voltage lockout (UVLO)
RoHS Compliant
* * * * OCP/SCP Trim function (Option) Remote On/Off 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 V to 3.3 V. It is packaged in a compact, overmolded package rated at 12 A. The output is closely regulated and the efficiency of 3.3 V 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
Note: Add "0" suffix at the end of the model number to indicate "Tube Packaging", and "R" for "Reel Packaging", and "G" for "Tray Packaging".
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 VO=3.3 V VO=2.5 V VO=1.8-1.0 V Input Current (no load) 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 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 V-5.5 V 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 V-3.3 V/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 VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=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
VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=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
VO=3.3 V
VO=2.5 V
Test conditions: di/dt=0.5A/us, Vin=5V, with 330uF external load capacitance.
VO=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 V-5.5 V Input 1.0 V-3.3 V/12 A Output
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=1.0 V Efficiency VO=1.8 V VO=1.5 V VO=1.2 V VO=1.0 V Switching Frequency Output Trim Range Remote Sense Compensation MTBF Dimensions (surface mount) Inches (L x W x H) Millimeters (L x W x H) Dimensions (vertical) Inches (L x W x H) Millimeters (L x W x H) Weight 85% 81% 79% 76% 250 kHz 90%VO 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%VO 10% SMD module Calculated Per Bell Core SR-332 (IO = 9.6 A, Vin=5 V; Ta = 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 V-5.5 V Input 1.0 V-3.3 V/12 A Output
Output Trim Equations
Equations for calculating the trim resistor (in k) 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.
RTrimDown =
A -B Vnom - Vadj
Vout Rtrimdown Module Trim GND
RTrimUp =
Vadj
C -D - Vnom
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 V-5.5 V Input 1.0 V-3.3 V/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
NON-ISOLATED DC/DC CONVERTERS
3.0 V-5.5 V Input 1.0 V-3.3 V/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 V-5.5 V Input 1.0 V-3.3 V/12 A Output
Thermal Derating Curves (continued)
SRAH-12F150
VRAH-12F150
SRAH-12F120
VRAH-12F120
SRAH-12F100 Test Condition: Derating curves are tested at 5 V input.
VRAH-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 V-5.5 V Input 1.0 V-3.3 V/12 A Output
Mechanical Outline SRAH-12Fxx0
Pin Connections
Pin 1 Function Remote On/Off (option) Vin Ground Vout Trim (option) Remote Sense (option) N/A
bel
2 3 4 5 6 7
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 V-5.5 V Input 1.0 V-3.3 V/12 A Output
Mechanical Outline (continued) VRAH-12Fxx0
bel
bel
Pin Connections
Pin 1 2 3 4 5 Function Remote On/Off (option) Vin Ground Vout Trim (option)
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 C.
(c)2005 Bel Fuse Inc. Specifications subject to change without notice. 112305
CORPORATE Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
FAR EAST Bel Fuse Ltd. 8F/ 8 Luk Hop Street San Po Kong Kowloon, Hong Kong Tel 852-2328-5515 Fax 852-2352-3706 www.belfuse.com
EUROPE Bel Fuse Europe Ltd. Preston Technology Management Centre Marsh Lane, Suite G7, Preston Lancashire, PR1 8UD, U.K. Tel 44-1772-556601 Fax 44-1772-888366 www.belfuse.com

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