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| NON-ISOLATED DC/DC CONVERTERS 2.4 Vdc - 5.5 Vdc Input 0.75 Vdc - 3.63 Vdc/3 A Output VRBA-03F1AX * * * * * Non-Isolated High Efficiency High Power Density RoHS Compliant * * * * OCP/SCP Rev.A Remote On/Off Wide Trim Range Converter Can Sink and Source Current Fixed Frequency (300 kHz) Under-voltage Lockout (UVLO) Description The Bel VRBA-03F1AX modules are a series of non-isolated dc/dc converters that deliver up to 3 A of output current with full load efficiency of 94% at 3.3 Vdc output. These modules provide precisely regulated voltage programmable via external resistor from 0.75 Vdc to 3.63 Vdc over a wide range of input voltage (2.4 Vdc - 5.5 Vdc). The open-frame construction and small footprint enable designers to develop cost and space-efficient solutions. Standard features include remote On/Off, over current protection, short circuit protection, undervoltage lockout, and programmable output voltage. Part Selection Output Voltage 0.75 V - 3.63 V 1 Input Voltage 2.4 V - 5.5 V Max. Output Current 3A Max. Output Power 10 W Typical Efficiency 94% Model Number Active Low VRBA-03F1AL Model Number Active High VRBA-03F1A0 Notes: 1. These modules use a buck topology, so the output voltages must be 0.5 V less than the input voltage. 2. Add "G" to the end of the Model Number to indicate Tray Packaging. 3. 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 5.8 V 5.5 V 85 C 125 C Notes Note: All specifications are typical 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 2.4 Vdc - 5.5 Vdc Input 0.75 Vdc - 3.63 Vdc/3 A Output Input Specifications Parameter Input Voltage Input Current (full load) Vo=3.3 V Vo=2.5 V Vo=2.0 V Vo=1.8 V Vo=1.5 V Vo=1.2 V Vo=0.75 V Input Current (no load) Vo=3.3 V Vo=0.75 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 2.4 V 1.7 V Typ 2.11 A 1.61 A 1.32 A 1.20 A 1.01 A 0.83 A 0.55 A 50 mA 20 mA 2 mA 45 mA 12 mA 2.05 V 2.0 V Max 5.5 V 0.04 A s 2.4 V 2 Notes Vo, set Vin-0.5 V Tested with simulated source impedance of 1 uH, 5 Hz to 20 MHz. Output Specifications Parameter Output Voltage Set Point Output Voltage Set Point Adjustment Range Selected by External Resistor or Voltage Load Regulation Line Regulation Regulation Over Temperature (-40 C to +85 C) Output Current Current Limit Threshold Short Circuit Surge Transient Ripple and Noise (pk-pk) Ripple and Noise (rms) Turn on Time Overshoot at Turn on Output Capacitance ESR 1 mohm ESR 10 mohm Transient Response 50% ~ 100% Max Load Settling Time 100% ~ 50% Max Load Settling Time Min -2% Vo,set -3% Vo,set 0.7525 V 0A 4A 0 uF 0 uF Typ 0.2% Vo,set 0.2% Vo,set 0.4% Vo,set 0.32 A s 30 mV 10 mV 10 mS 150 mV 40 uS 150 mV 40 uS 2 Max 2% Vo,set 3% Vo,set 3.63 V 3A 9.5 A 50 mV 15 mV 14 mS 1% 1000 uF 3000 uF - Notes Vin=5 V, 50%lo max Over all operating input voltage, resistive load and temperature conditions until end of life. Io=Iomin to 50% Iomax Vin=Vinmin to Vinmax Tref=Tamin to Tamax Tested with 0-20 MHz, with 10 uF tantalum capacitor & 1 uF /10 V ceramic capacitor at the output VO = 0.75 V 3.63 V di/dt=2.5 A/uS; Vin=5 V; and with 10 uF tantalum capacitor & 1 uF/10 V TDK ceramic 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 2.4 Vdc - 5.5 Vdc Input 0.75 Vdc - 3.63 Vdc/3 A Output General Specifications Parameter Efficiency Vo=3.3 V Vo=2.5 V Vo=2.0 V Vo=1.8 V Vo=1.5 V Vo=1.2 V Vo=0.75 V Switching Frequency Output Voltage Trim Range MTBF Dimensions Inches (L x W x H) Millimeters (L x W x H) Weight 1.00 x 0.50 x 0.27 25.41 x 12.70 x 6.85 5g 250 kHz 0.7525 V 94% 93% 91% 90% 89% 87% 81.5% 300 kHz 9,776,636 hours 350 kHz 3.63 V Calculated Per Bell Core SR-332 (Vin=5 V; IO = 2.4 A, Vo=1.8 V; Ta=25 C) Min Typ Max Notes Measured at Vin=5 V, full load Note: All specifications are typical at 25 C unless otherwise stated. Control Specifications Parameter Remote On/Off Signal Low (Unit Off) Signal High (Unit On) Signal Low (Unit On) Signal High (Unit Off) -0.2 V -0.2 V 1.5 V 0.3 V Vin, max 0.3 V Vin, max Active High: VRBA-03F1A0; Remote On/Off pin open, Unit on. Min Typ Max Notes Active Low: VRBA-03F1AL; Remote On/Off pin open, Unit on. 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 2.4 Vdc - 5.5 Vdc Input 0.75 Vdc - 3.63 Vdc/3 A Output Output Trim Equations A: Equation for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) is shown below. The Trim Up resistor should be connected between the Trim pin and Ground. Rtrim 21.07 = - 5.11 Vadj - 0.7525 Vout Table 1 Vadj (V) 0.7525 1.2 1.5 1.8 2.0 2.5 3.3 Rtrim (K) Open 41.973 23.077 15.004 11.779 6.947 3.16 Rtrim(k) 200 180 160 140 120 100 80 60 40 20 Rtrim vs.Output Voltage Module Trim Rtrim GND 0 0.75 1.04 1.33 1.61 1.9 2.19 2.48 2.77 3.05 3.34 3.63 Output Voltage(V) B. Equation for calculating the trim voltage (in V) given the desired adjusted voltage (Vadj) is shown below. The Trim Up voltage should be connected between the Trim pin and Ground. Vtrim = 0.7 - 0.1698 x (Vadj - 0.7525) Table 2 Vout 0.7 Vtrim vs. Output Voltage Module Trim Vtrim GND Vadj (V) 0.7525 1.2 1.5 1.8 2.0 2.5 3.3 Vtrim (V) Open 0.624 0.5731 0.5221 0.4882 0.4033 0.267 0.65 0.6 0.55 Vtrim(V) 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.75 1.04 1.33 1.61 1.9 2.19 2.48 Vo(V) 2.77 3.05 3.34 3.63 C. VO Rdown Rset 21.07 Vo - 0.7525 - 5.11 K Rup Trim Rset GND 21.07 Rset - 5.11 Vm_upRset + 3.845 Rset K Vm_upRset + 5.11 Vm_up - 0.753Rset - 24.915 Vm_up: Margin up value after output voltage is set with Rset Rup Rdown 5.978 Vm_down Rset - 4.230 Rset K 0.128 Rset - 0.868 Vm_down - 0.170 Vm_down Rset + 4.230 Vm_down: Margin down value after output voltage is set with Rset Vm_down 90%Vo Note: Output voltage Vo=0.7525 V when Trim pin 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 2.4 Vdc - 5.5 Vdc Input 0.75 Vdc - 3.63 Vdc/3 A Output Efficiency Data Efficiency Curve 100.0% 95.0% 90.0% Efficiency 100.0% 95.0% 90.0% 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% Efficiency Curve Efficiency 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 0.6 1.2 1.8 Output Current (A) 2.4 3.0 4.5 V 5.0 V 5.5 V 4.5 V 5.0 V 5.5 V 0.6 1.2 1.8 Output Current (A) 2.4 3.0 Vo=3.3 V Efficiency Curve 100.0% 95.0% 90.0% Efficiency Vo=2.5 V Efficiency Curve 95.0% 90.0% 85.0% Efficiency 3.3 V 5.0 V 5.5 V 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 0.6 1.2 1.8 Output Current (A) 2.4 3.0 80.0% 75.0% 70.0% 65.0% 60.0% 0.6 1.2 1.8 Output Current (A) 2.4 3.0 3.3 V 5.0 V 5.5 V Vo=2.0 V Efficiency Curve 100.0% 95.0% 90.0% 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 0.6 1.2 1.8 Output Current (A) 2.4 3.0 Vo=1.8 V Efficiency Curve 100.0% 95.0% 90.0% Efficiency 2.5 V 3.3 V 5.0 V Efficiency 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 0.6 1.2 1.8 Output Current (A) 2.4 3.0 2.5 V 3.3 V 5.0 V Vo=1.5 V Efficiency Curve 100.0% 95.0% 90.0% Efficiency 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 0.6 1.2 1.8 Output Current (A) 2.4 3.0 2.5 V 3.3 V 5.0 V Vo=1.2 V Vo=0.75 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 2.4 Vdc - 5.5 Vdc Input 0.75 Vdc - 3.63 Vdc/3 A Output Thermal Derating Curve Ripple and Noise Waveforms 5.0 V input, 0.75 V output 5.0 V input, 1.8 V output 5.0 V input, 3.3 V output Note: Ripple and noise at full load, 0-20 MHz BW, 10 uF/10 V tantalum cap and 1 uF/10 V ceramic cap at the output, and 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 2.4 Vdc - 5.5 Vdc Input 0.75 Vdc - 3.63 Vdc/3 A Output Transient Response Waveforms Transients 50% to 100% load 0.75 Vdc output Transients 100% to 50% load 0.75 Vdc output Transients 50% to 100% load 1.8 Vdc output Transients 100% to 50% load 1.8 Vdc output Transients 50% to 100% load 3.3 Vdc output Transients 100% to 50% load 3.3 Vdc output Note: Transient response at 5 Vdc input, di/dt=2.5 A/uS, with 10 uF/10 V tantalum cap and 1 uF/10 V 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 2.4 Vdc - 5.5 Vdc Input 0.75 Vdc - 3.63 Vdc/3 A Output Mechanical Outline Pin Connections Pin 1 2 3 4 5 6 Function Vout Trim Ground N/A Vin Remote On/Off RoHS Compliance Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products. (c)2007 Bel Fuse Inc. Specifications subject to change without notice. 011807 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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