NON-ISOLATED DC/DC CONVERTERS 2.4 Vdc - 5.5 Vdc Input VRBA-03F1Ax • 0.75 Vdc - 3.63 Vdc/3 A Output RoHS Compliant • Non-Isolated Rev.A OCP/SCP • High Efficiency • Remote On/Off • High Power Density • Wide Trim Range • Fixed Frequency (300 kHz) • • Under-voltage Lockout (UVLO) Converter Can Sink and Source Current 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 Max. Output Current Max. Output Power Typical Efficiency Model Number Active Low Model Number Active High 2.4 V - 5.5 V 3A 10 W 94% VRBA-03F1AL 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 Min Typ Max Input Voltage (continuous) Parameter -0.3 V - 5.8 V Output Enable Terminal Voltage -0.3 V - 5.5 V Ambient Temperature -40 °C - 85 °C Storage Temperature -55 °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) Min 2.4 V Typ - Max 5.5 V Notes Vo, set ≤ Vin-0.5 V 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 - 2.11 A 1.61 A 1.32 A 1.20 A 1.01 A 0.83 A 0.55 A - Vo=3.3 V Vo=0.75 V - 50 mA 20 mA 2 mA 45 mA 12 mA - I t Inrush Current Transient - - 0.04 A s Turn-on Voltage Threshold Turn-off Voltage Threshold 1.7 V 2.05 V 2.0 V 2.4 V - Input Current (no load) Remote Off Input Current Input Reflected Ripple Current (pk-pk) Input Reflected Ripple Current (rms) 2 Tested with simulated source impedance of 1 uH, 5 Hz to 20 MHz. 2 Output Specifications Parameter Output Voltage Set Point Min -2% Vo,set Typ - Max 2% Vo,set Output Voltage Set Point -3% Vo,set - 3% Vo,set 0.7525 V - 3.63 V - 0.2% Vo,set 0.2% Vo,set - Io=Iomin to 50% Iomax Vin=Vinmin to Vinmax - 0.4% Vo,set - Tref=Tamin to Tamax 0A 4A - 3A 9.5 A Short Circuit Surge Transient - 0.32 A s - Ripple and Noise (pk-pk) - 30 mV 50 mV Ripple and Noise (rms) - 10 mV 15 mV Turn on Time Overshoot at Turn on Output Capacitance - 10 mS - 14 mS 1% 0 uF 0 uF - 1000 uF 3000 uF - 150 mV 40 uS 150 mV 40 uS - 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 ESR ≥ 1 mohm ESR ≥ 10 mohm Transient Response 50% ~ 100% Max Load Settling Time 100% ~ 50% Max Load Settling Time VO = 0.75 V 3.63 V 2 Notes Vin=5 V, 50%lo max Over all operating input voltage, resistive load and temperature conditions until end of life. Tested with 0-20 MHz, with 10 uF tantalum capacitor & 1 uF /10 V ceramic capacitor at the output 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 Min Typ Max - 94% 93% 91% 90% 89% 87% 81.5% - Switching Frequency 250 kHz 300 kHz 350 kHz Output Voltage Trim Range 0.7525 V - 3.63 V Notes 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 MTBF Measured at Vin=5 V, full load Calculated Per Bell Core SR-332 (Vin=5 V; IO = 2.4 A, Vo=1.8 V; Ta=25 °C) 9,776,636 hours Dimensions Inches (L × W × H) Millimeters (L × W × H) Weight 1.00 x 0.50 x 0.27 25.41 x 12.70 x 6.85 - 5g - Note: All specifications are typical at 25 °C unless otherwise stated. Control Specifications Parameter Min Typ Max Signal Low (Unit Off) -0.2 V - 0.3 V Signal High (Unit On) - - Vin, max Signal Low (Unit On) -0.2 V - 0.3 V Signal High (Unit Off) 1.5 V - Vin, max Notes Remote On/Off Active High: VRBA-03F1A0; Remote On/Off pin open, Unit on. 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 kΩ) given the desired adjusted voltage (Vadj) is shown below. The Trim Up resistor should be connected between the Trim pin and Ground. Table 1 Vadj (V) 0.7525 1.2 1.5 1.8 2.0 2.5 3.3 Vout Module 200 Trim Rtrim GND Rtrim vs.Output Voltage 180 Rtrim (KΩ) Open 41.973 23.077 15.004 11.779 6.947 3.16 160 140 Rtrim(kΩ) Rtrim 21.07 = − 5.11 Vadj − 0.7525 120 100 80 60 40 20 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 × (Vadj − 0.7525) 0.7 Table 2 Vout Module Trim Vtrim GND C. Rset VO Rdown Rup Trim 21.07 Vo − 0.7525 0.6 0.55 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 − 5.11 KΩ 21.07 ⋅Rset − 5.11 ⋅Vm_up⋅Rset + 3.845 ⋅Rset KΩ Vm_up⋅Rset + 5.11 ⋅Vm_up − 0.753Rset − 24.915 Vm_up: Margin up value after output voltage is set with Rset Rset Rup Rdown GND 0.65 Vtrim (V) Open 0.624 0.5731 0.5221 0.4882 0.4033 0.267 Vtrim(V) Vadj (V) 0.7525 1.2 1.5 1.8 2.0 2.5 3.3 Vtrim vs. Output Voltage 5.978 ⋅Vm_down ⋅Rset − 4.230 ⋅Rset KΩ 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 Efficiency Curve 100.0% 100.0% 95.0% 95.0% 90.0% 85.0% Efficiency Efficiency 90.0% 4.5 V 5.0 V 5.5 V 80.0% 75.0% 85.0% 4.5 V 5.0 V 5.5 V 80.0% 75.0% 70.0% 70.0% 65.0% 65.0% 60.0% 60.0% 0.6 1.2 1.8 2.4 0.6 3.0 1.2 Vo=3.3 V 3.0 Efficiency Curve 100.0% 95.0% 95.0% 90.0% 90.0% 85.0% 85.0% Efficiency Efficiency 2.4 Vo=2.5 V Efficiency Curve 3.3 V 5.0 V 5.5 V 80.0% 75.0% 3.3 V 5.0 V 5.5 V 80.0% 75.0% 70.0% 70.0% 65.0% 65.0% 60.0% 60.0% 0.6 1.2 1.8 2.4 3.0 0.6 1.2 Output Current (A) 1.8 2.4 3.0 Output Current (A) Vo=2.0 V Vo=1.8 V Efficiency Curve Efficiency Curve 100.0% 100.0% 95.0% 95.0% 90.0% 85.0% Efficiency 90.0% Efficiency 1.8 Output Current (A) Output Current (A) 2.5 V 3.3 V 5.0 V 80.0% 75.0% 85.0% 75.0% 70.0% 70.0% 65.0% 65.0% 60.0% 2.5 V 3.3 V 5.0 V 80.0% 60.0% 0.6 1.2 1.8 2.4 3.0 0.6 1.2 Output Current (A) 1.8 2.4 3.0 Output Current (A) Vo=1.5 V Vo=1.2 V Efficiency Curve 100.0% 95.0% Efficiency 90.0% 85.0% 2.5 V 3.3 V 5.0 V 80.0% 75.0% 70.0% 65.0% 60.0% 0.6 1.2 1.8 2.4 3.0 Output Current (A) 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 Function 1 Vout 2 Trim 3 Ground 4 N/A 5 Vin 6 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. ©2007 Bel Fuse Inc. Specifications subject to change without notice. 011807 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