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NON-ISOLATED DC/DC CONVERTERS
12 Vdc Input 0.9 Vdc - 3.3 Vdc/7 A Output
XRAH-07A1A0
* * * * * Non-Isolated Fixed Frequency High Efficiency High Power Density Low Cost
RoHS Compliant
* * * * *
Rev.A
Remote On/Off Input Under Voltage Lockout OCP/SCP Wide Range Trim UL60950-1 Recognized (UL/cUL)
Description
The Bel XRAH-07A1A0 modules are a series of non-isolated, step down dc/dc converters that operate from a nominal 12 Vdc source. These converters are available in a range of output voltages from 0.9 Vdc to 3.3 Vdc. It is packaged in a compact, overmolded package rated at 7 A. Optional lead forming provides a vertical mount product for minimal footprint or a surface mount option for a very low profile. The output is closely regulated and the efficiency is typically 88% for 3.3 Vdc output at full load. Typical features include remote on/off, input under voltage lockout, over current protection and short circuit protection.
Part Selection
Output Voltage 0.9 Vdc - 3.3 Vdc Input Voltage 12 Vdc Max. Output Current 7A Max. Output Power 23.1 W Typical Efficiency 88% Part Number Surface Mount SRAH-07A1A0 Part Number Vertical Mount VRAH-07A1A0
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 15 V 14 V 85 C 125 C Notes
Input Specifications
Parameter Input Voltage 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=0.9 V Remote Off Input Current Min 10 V Typ 3 mA Max 14 V 100 mA 3.0 A 2.6 A 1.9 A 1.6 A 1.3 A 1.0 A 10 mA 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
12 Vdc Input 0.9 Vdc - 3.3 Vdc/7 A Output
Input Specifications (continued)
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
Min -
Typ 180 mA 50 mA 0.01 A s 9.5 V 9.0 V
2
Max 0.02 A s 9.5 V
2
Notes
Tested with simulated source impedance of 500 nH, 5 Hz to 20 MHz and two 270 uF/16 V Oscon capacitors with ESR=0.018 ohm max. at 100 kHz
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=0.9 V Line Regulation Load Regulation VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Regulation Over Temperature (-40 C to +85 C) Output Current Current Limit Threshold Short Circuit Surge Transient Ripple and Noise (rms) VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Ripple and Noise (pk-pk) VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V 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 330 uF 70 mV 70 mV 60 mV 60 mV 60 mV 50 mV 8 mS 0% 120 mV 50 uS 120 mV 50 uS 100 mV 100 mV 100 mV 80 mV 80 mV 70 mV 20 mS 3% 2800 uF 180 mV 80 uS 180 mV 80 uS 0A 10 A Min 3.247 V 2.460 V 1.771 V 1.476 V 1.181 V 0.886 V Typ 3.3 V 2.5 V 1.8V 1.5 V 1.2 V 0.9 V 3mV 5 mV 5 mV 5 mV 3 mV 3 mV 3 mV 30 mV 2 0.02 A s 20 mV 20 mV 15 mV 15 mV 15 mV 10 mV Max 3.353 V 2.540 V 1.829 V 1.524 V 1.219 V 0.914 V 6mV 10 mV 10 mV 10 mV 6 mV 6 mV 6 mV 50 mV 7A 20 A 2 0.04 A s 50 mV 50 mV 40 mV 40 mV 30 mV 30 mV Notes
Test conditions: Vin=12 V, Io=50% full load
Test condition: 0-20 MHz BW, with a 330 uF/10 V Tantalum capacitor at the output.
All
Test conditions: di/dt = 0.5 A/uS; Vin = 12 V; with a 330 uF/10 V Tantalum capacitor at the output.
Note: All specifications are typical at nominal 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
12 Vdc Input 0.9 Vdc - 3.3 Vdc/7 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=0.9 V Switching Frequency Output Trim Range (wide trim) Output Trim Range (narrow trim) VO=1.2 V-3.3 V VO=0.9 V 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% 83% 80% 78% 75% 71% 250 kHz 90% Vo 88% 86% 83% 81% 78% 74% 300 kHz 350 kHz 403% Vo 110% Vo 110% Vo Calculated Per Bell Core SR-332 (Vin=12 V; Vo=3.3 V; IO = 5.6 A; Ta = 25C) VO=0.9 V Measured at Vin=12 V, full load and Ta=25 C Min Typ Max Notes
8,202,646 hours
0.78 x 0.70 x 0.32 19.81 x 17.78 x 8.13 0.70 x 0.308 x 0.65 17.78 x 7.82 x 16.51 5g -
Control Specifications
Parameter Remote On/Off Signal Low (Unit Off) Signal High (Unit On) -0.3 V 3.5 V 1V 14 V Min Typ Max Notes
Remote on/off pin open, unit on.
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 Up resistor should be connected between the Trim pin and Ground.
Rtrimup
6.06 = - 1.05 Vadj - Vnom
Vout Module Trim Rtrimup GND
Note: Output voltage Vo=0.9 V when Rtrimup is not connected.
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
12 Vdc Input 0.9 Vdc - 3.3 Vdc/7 A Output
Efficiency Data
Efficiency Curve 95.0% 90.0% 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 0.70
Efficiency
10.0 V 12.0 V 14.0 V
1.75
3.50
5.25
7.00
Output Current (A)
Vo=3.3 V
Efficiency Curve 90.0% 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 55.0% 0.70 1.75 3.50 5.25 7.00 Output Current (A)
Efficiency
10.0 V 12.0 V 14.0 V
Vo=1.8 V
Efficiency Curve 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 55.0% 50.0% 45.0% 0.70 1.75 3.50 5.25 7.00 Output Current (A)
Efficiency
10.0 V 12.0 V 14.0 V
Vo=0.9 V
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
12 Vdc Input 0.9 Vdc - 3.3 Vdc/7 A Output
Thermal Derating Curves
Vo=0.9 V - 2.5 V
Vo=3.3 V
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
12 Vdc Input 0.9 Vdc - 3.3 Vdc/7 A Output
Ripple and Noise Waveforms
Ripple and noise at full load 0.9 Vdc output
Ripple and noise at full load 1.2 Vdc output
Ripple and noise at full load 1.5 Vdc output
Ripple and noise at full load 1.8 Vdc output
Ripple and noise at full load 2.5 Vdc output
Ripple and noise at full load 3.3 Vdc output
Note: Ripple and Noise at 12 Vdc input, with a 330 uF/10 V tantalum cap 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
12 Vdc Input 0.9 Vdc - 3.3 Vdc/7 A Output
Transient Response Waveforms
Transients 50% to 100% load 0.9 Vdc output
Transients 100% to 50% load 0.9 Vdc output
Transients 50% to 100% load 1.2 Vdc output
Transients 100% to 50% load 1.2 Vdc output
Transients 50% to 100% load 1.5 Vdc output
Transients 100% to 50% load 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
12 Vdc Input 0.9 Vdc - 3.3 Vdc/7 A Output
Transient Response Waveforms (continued)
Transients 50% to 100% load 1.8 Vdc output
Transients 100% to 50% load 1.8 Vdc output
Transients 50% to 100% load 2.5 Vdc output
Transients 100% to 50% load 2.5 Vdc output
Transients 50% to 100% load 3.3 Vdc output
Transients 100% to 50% load 3.3 Vdc output
Note: Transient Response at 12 V input, di/dt=0.5 A/uS, with 330 uF/10 V tantalum cap 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
12 Vdc Input 0.9 Vdc - 3.3 Vdc/7 A Output
Mechanical Outline
SRAH-07A1A0
Pin Connections
bel
Pin 1 2 3 4 5 6 7
Function Remote On/Off (option) Vin Ground Vout Trim (option) N/A N/A
VRAH-07A1A0
Pin Connections
bel
Pin 1 2 3 4 5
Function Remote On/Off (option) Vin Ground Vout Trim (option)
bel
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)2007 Bel Fuse Inc. Specifications subject to change without notice. 010507
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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