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NON-ISOLATED DC/DC CONVERTERS
3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/7 A Output
XRAH-07C1A0 Series
* * * * * Non-Isolated Fixed Frequency High Efficiency High Power Density UL60950 Recognized (UL/cUL)
RoHS Compliant
* * * * * Remote On/Off Input Under Voltage Lockout OCP/SCP Wide Range Trim Low Cost
Description
The Bel XRAH-07C1A0 module is a series of non-isolated, step down dc/dc power converters that operate from a nominal 3.3 Vdc source. These converters are available in a range of output voltages from 0.9 Vdc to 2.5 Vdc (default output voltage is 1.8 Vdc). It is packaged in a compact, overmolder 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 92% at full load.
Part Selection
Output Voltage 0.9 Vdc - 2.5 Vdc Input Voltage 3.3 Vdc Max. Output Current 7A Max. Output Power 17.5 W Typical Efficiency 92% Part Number Surface Mount SRAH-07C1A0 Part Number Vertical Mount VRAH-07C1A0
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 -40 C Typ Max 6V 6V 85 C 125 C Notes
Input Specifications
Parameter Input Voltage Input Current (no load) Input Current (full load) VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=1.0 V VO=0.9 V Remote Off Input Current 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 3V 2.5 V -
Typ 7 mA 150 mA 50 mA 0.08 A s 2.4 V
2
Max 3.6 V 110 mA 6.6 A 5.3 A 4.6 A 3.8 A 3.2 A 3.0 A 15 mA 250 mA 80 mA 0.16 A s 2.8 V 2
Notes
With simulated source impedance of 500 nH, 5 Hz to 20 MHz and a 270 uF/16 V with ESR=0.03 ohm max. at 100 kHz
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
3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/7 A Output
Output Specifications
Parameter Output Voltage Set Point VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=1.0 V VO=0.9 V Line Regulation VO=1.5 V-2.5 V VO=0.9 V-1.2 V Load Regulation VO=1.5 V-2.5 V VO=0.9 V-1.2 V Regulation Over Temperature (-40 C to +85 C) VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=1.0 V VO=0.9 V 0A 8.4 A VO=2.5 V-0.9 V Ripple and Noise (pk-pk) VO=2.5 V-1.2 V VO=1.0 V-0.9 V Turn on Time Overshoot at Turn on Output Capacitance Transient Response 50% ~ 100% Max Load 100% ~ 50% Max Load 50% ~ 100% Max Load 100% ~ 50% Max Load 50% ~ 100% Max Load 100% ~ 50% Max Load Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Vo=0.9 V1.2 V Vo=1.5 V Vo=1.8 V2.5 V 0 uF 40 mV 40 mV 7 mS 0% 120 mV 40 uS 120 mV 40 uS 100 mV 40 uS 100 mV 40 uS 50 mV 40 uS 50 mV 40 uS 80 mV 70 mV 15 mS 1% 2200 uF 180 mV 80 uS 180 mV 80 uS 150 mV 80 uS 150 mV 80 uS 100 mV 80 uS 100 mV 80 uS Test conditions: di/dt = 0.5 A/uS; Vin = 3.3 V; without any external capacitor at the output. Min 2.450 V 1.764 V 1.470 V 1.176 V 0.980 V 0.882 V Typ 2.5 V 1.8 V 1.5 V 1.2 V 1.0 V 0.9 V 3 mV 1 mV 3 mV 1 mV 25 mV 15 mV 15 mV 10 mV 8 mV 8 mV 0.08 A s 10 mV
2
Max 2.550 V 1.836 V 1.530 V 1.224 V 1.020 V 0.918 V 10 mV 5 mV 10 mV 5 mV 40 mV 30 mV 30 mV 20 mV 15 mV 15 mV 7A 17.5 A 0.12 A s 20 mV
2
Notes
Test conditions: Vin=3.3 V, Io= full load
Output Current Current Limit Threshold Short Circuit Surge Transient Ripple and Noise (rms)
Test condition: 0-20 MHz BW, with a 1 uF ceramic capacitor and 10 uF aluminum 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
3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/7 A Output
General Specifications
Parameter Efficiency VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=1.0 V VO=0.9 V Switching Frequency Output Trim Range 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 90% 86% 84% 81% 79% 78% 250 kHz 50% 92% 88% 86% 83% 81% 80% 300 kHz 340 kHz 146% Measured at Vin=3.3 V, full load and Ta=25 C Min Typ Max Notes
3,391,747 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
VO=1.8 V Calculated Per Bell Core SR-332 (Vin=3.3 V; Vo=1.8 V; IO = 5.6 A; Ta = 25C)
-
-
Control Specifications
Parameter Remote On/Off Signal Low (Unit Off) Signal High (Unit On) Min -0.3 V 1.8 V Typ Max 1V 3.6 V Notes
Remote on/off pin open, unit on.
Output Trim Equations
Equations for calculating the trim resistor given the desired adjusted voltage (Vadj) and the nominal output voltage of the converter (Vnom) are shown below. The Trimup resistor should be connected between the Trim pin and Ground and the Trimdown resistor should be connected between the Trim pin and Vout pin.
3.064 Rtrim _ up = ( - 0.261) K ohm Vo, adj - Vo
Vout Module Trim Rtrimup GND
3.8488 Rtrim _ down = ( - 4.091)Kohm Vo - Vo, adj
Module
Vout Rtrimdown Trim GND
Note: Output voltage Vo=1.8 V when Rtrim is open.
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
3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/7 A Output
Efficiency Data
MODULE 2.5V 100.0% EFFICIENCY
EFFICIENCY 100.0% MODULE 1.8V
90.0% 80.0% 70.0% 60.0% 0.7 1.8 3.5 5.3 7.0 OUTPUT CURRENT
3 3.3 3.6
90.0% 80.0% 70.0% 60.0% 0.7 1.8 3.5 5.3 7.0 OUTPUT CURRENT
3 3.3 3.6
MODULE 1.5V 95.0%
MODULE 1.2V 90.0% EFFICIENCY 80.0% 70.0% 60.0% 50.0%
EFFICIENCY
85.0% 75.0% 65.0% 55.0% 0.7 1.8 3.5 5.3 7.0 OUTPUT CURRENT
3 3.3 3.6
3 3.3 3.6
0.7
1.8
3.5
5.3
7.0
OUTPUT CURRENT
MODULE 1.0V 90.0%
MODULE 0.9V 95.0% EFFICIENCY
3 3.3 3.6
EFFICIENCY
80.0% 70.0% 60.0% 50.0% 0.7 1.8 3.5 5.3 7.0 OUTPUT CURRENT
85.0% 75.0% 65.0% 55.0% 0.7 1.8 3.5 5.3 7.0 OUTPUT CURRENT
3 3.3 3.6
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
3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/7 A Output
Thermal Derating Curves
VRAH-07C1A0
SRAH-07C1A0
Ripple and Noise Waveforms
Note: Ripple and noise at full load, 3.3 Vdc input, 1.8 Vdc output and Ta=25 deg C, with 1 uF ceramic capacitor and 10 uF aluminum capacitor at the 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
3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/7 A Output
Transient Response Waveforms
50% to 100% load Transient at Vin=3.3 V, Vo=1.8 V
100% to 50% load Transient at Vin=3.3 V, Vo=1.8 V
Note: Transient Response at di/dt=0.5 A/uS, external load capacitance Co=0uF (electrolytic), 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
3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/7 A Output
Mechanical Outline SRAH-07C1A0
Pin Connections
Pin Function Remote On/Off Vin Ground Vout Trim N/A N/A
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1 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
3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/7 A Output
Mechanical Outline (continued) VRAH-07C1A0
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Pin Connections
Pin 1 2 3 4 5 Function Remote On/Off Vin Ground Vout Trim
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)2006 Bel Fuse Inc. Specifications subject to change without notice. 032806
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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