NON-ISOLATED DC/DC CONVERTERS 5 Vdc - 24 Vdc Input xRAH-03L1A0 0.9 Vdc - 3.3 Vdc/3 A Output RoHS Compliant Rev.A • Non-Isolated • Remote On/Off • High Efficiency • Fixed Frequency • High Power Density • OCP/SCP • Low Cost • UL60950-1 Recognized (UL/cUL Description The Bel xRAH-03L1A0 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 an output voltage range from 0.9 Vdc to 3.3 Vdc. It is packaged in a compact, overmolded package rated at 3 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 for 3.3 Vdc output is typically 88% at full load. Typical features include remote on/off, over current protection and short circuit protection. Part Selection Output Voltage 0.9 V - 3.3 V Input Voltage 5.0 V - 24 V Max. Output Current 3A Max. Output Power 10 W Typical Efficiency 88% Part Number Surface Mount SRAH-03L1A0 Part Number Vertical Mount VRAH-03L1A0 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 -40 °C Typ - Max 25 V 24 V 85 °C 125 °C Notes Input Specifications Parameter Min Typ Max 5V 5V 5V 5V 5V 5V - 3 mA 24 V 24 V 18 V 15 V 12 V 9V 100 mA 3A 10 mA Input Reflected Ripple Current (pk-pk) - 200 mA - Input Reflected Ripple Current (rms) - 50 mA - I t Inrush Current Transient - 2 0.05 A s 0.1 A s Turn on Voltage Threshold Turn off Voltage Threshold 3.5 V 4.0 V - 4.9 V Notes Input Voltage VO=3.3 V VO=2.5 V VO=1.8 V Vo=1.5 V Vo=1.2 V Vo=0.9 V Input Current (no load) Input Current (full load) Remote Off Input Current 2 With simulated source impedance of 500 nH, 5 Hz to 20 MHz. Use one 100 uF/ 35 V Tantalum capacitor and one 3.3 uF/ 50 V ceramic capacitor at the input 2 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 5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output Output Specifications Parameter Output Voltage Set Point Min Typ Max VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V 3.200 V 2.425 V 1.746 V 1.470 V 1.176 V 0.882 V 3.3 V 2.5 V 1.8 V 1.5V 1.2 V 0.9 V 3.400 V 2.575 V 1.854 V 1.530 V 1.224 V 0.918 V VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V - ±10 mV ±10 mV ±5 mV ±5 mV ±5 mV ±3 mV ±20 mV ±15 mV ±10 mV ±10 mV ±10 mV ±7.5 mV 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) VO=3.3 V VO=2.5 V VO=1.8 V VO=1.5 V VO=1.2 V VO=0.9 V Output Current Range Output DC Current Limit Short Circuit Surge Transient - ±25 mV ±15 mV ±10 mV ±10 mV ±8 mV ±5 mV ±45 mV ±35 mV ±25 mV ±20 mV ±15 mV ±13 mV 0A 4A - ±30 mV ±25 mV ±20 mV ±15 mV ±10 mV ±8 mV 2 0.8 A s ±60 mV ±45 mV ±33 mV ±27 mV ±22 mV ±16 mV 3A 8A 2 1.5 A s - 30 mV 50 mV 0 uF 70 mV 70 mV 60 mV 60 mV 50 mV 50 mV 7 mS 0% - 130 mV 100 mV 100 mV 100 mV 100 mV 100 mV 10 mS 3% 1200 uF Notes Test conditions: Io=50% full load. Line Regulation Load Regulation Ripple and Noise (rms) 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 Overshoot 50% ~ 100% Max Load Settling Time Overshoot 100% ~ 50% Max Load Settling Time 3.3 V 0.9 V-2.5 V - 150 mV 50 uS 150 mV 50 uS 100 mV 50 uS 100 mV 50 uS 200 mV 100 uS 200 mV 100 uS 150 mV 100 uS 150 mV 100 uS Test conditions: 0-20 MHz BW, with 1 uF /16 V ceramic capacitor at the output. Test conditions: di/dt = 0.5 A/us, with 220 uF external 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 5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output General Specifications Parameter Min Typ Max Notes 85% 82% 79% 77% 74% 72% 88% 85% 82% 80% 77% 75% - 250 kHz 300 kHz 360 kHz 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 MTBF Calculated Per Bell Core SR-332 (Vin=12 V; Vo=3.3 V; IO =2.4 A; Ta = 25 °C) 9,900,543 hours Dimensions (surface mount) Inches (L × W × H) Millimeters (L × W × H) Dimensions (vertical) Inches (L × W × H) Millimeters (L × W × H) Weight Vin=12.0V; lo=lo, max 0.78 x 0.7 x 0.32 19.81 x 17.78 x 8.13 0.7 x 0.308 x 0.65 17.78 x 7.82 x 16.51 - 4.9 g - Control Specifications Parameter Remote On/Off Min Typ Max Signal Low (Unit Off) -0.3 V - 1V Signal High (Unit On) 2.8 V - 24 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 (Vo) are shown below. 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. ⎞ ⎛ 6.928 Rtrim _ up = ⎜⎜ −1⎟⎟Kohm ⎝ Vadj _ up −Vo ⎠ Vout Module Trim Rtrim-up GND Note: Output voltage Vo=0.902 V when Rtrim_up 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 5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output Efficiency Data Efficiency Curve 100.0% Efficiency 90.0% 80.0% 5V 12 V 24 V 70.0% 60.0% 50.0% 40.0% 0.30 0.75 1.50 2.25 3.00 Output current (A) Vo=3.3 V Efficiency Curve 100.0% Efficiency 90.0% 80.0% 5V 12 V 18 V 70.0% 60.0% 50.0% 40.0% 0.30 0.75 1.50 2.25 3.00 Output current (A) Vo=1.8 V Efficiency Curve 100.0% Efficiency 90.0% 80.0% 5V 7V 9V 70.0% 60.0% 50.0% 40.0% 0.30 0.75 1.50 2.25 3.00 Output current (A) 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 5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output Thermal Derating Curve xRAH-03L1A0 Ripple and Noise Waveforms 5 Vdc input, 0.9 V output 12 Vdc input, 1.8 V output 12 Vdc input, 3.3 V output Note: Ripple and noise at full load, with 1uF/16V ceramic 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 5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output Transient Response Waveforms 50% to 100% load 5 V input, 0.9 V output 50% to 100% load 5 V input, 0.9 V output 50% to 100% load 12 V input, 1.8 V output 50% to 100% load 12 V input, 1.8 V output 50% to 100% load 12 V input, 3.3 V output 50% to 100% load 12 V input, 3.3 V output Note: Transient Response at di/dt=0.5 A/uS, with 220 uF/10 V external cap, 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 5 Vdc - 24 Vdc Input 0.9 Vdc - 3.3 Vdc/3 A Output Mechanical Outline SRAH-03L1A0 Pin Connections bel VRAH-03L1A0 Pin 1 2 3 4 5 6 7 Function Remote On/Off (option) Vin Ground Vout Trim (option) N/A N/A Pin Connections bel bel Pin Function 1 Remote On/Off (option) 2 Vin 3 Ground 4 Vout 5 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 ºC. ©2007 Bel Fuse Inc. Specifications subject to change without notice. 010807 CORPORATE FAR EAST EUROPE Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com 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 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