NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 12V Input / 1.5V – 5.0V Output / 3A BP05xRAH-03A SRAH-03A / VRAH-03A Series RoHS Compliant • Nonisolated • Compact, low profile surface mount package • Fixed frequency • High efficiency means less power dissipation • Excellent thermal performance • Optimized for cost • Remote on/off • Undervoltage lockout (UVLO) • Over current and short circuit protection Description The Bel SRAH-03A and VRAH-03A modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal 12V source. These converters are available in a range of output voltages from 1.5V to 5.0V. They are packaged in a compact, overmolded package rated at 3A. Optional lead forming provides a vertical mount product for minimal footprint or a surface mount option for a very low profile. Standard features include remote on/off, over current and short circuit protection, and output voltage adjust. These products may be used almost anywhere low voltage silicon is employed and a 12V source is available. Typical applications include file servers, routers, line cards and other computing and communications equipment. Applications • Distributed power architectures • Data networking equipment • Telecommunications • Computers and peripherals Part Number Selection Output Voltage Input Voltage Max. Output Current Max. Output Power Typical Efficiency Part Number Surface Mount Part Number Vertical Mount 5.0V 12V 3A 15W 91% SRAH-03A500 VRAH-03A500 3.3V 12V 3A 9.9W 90% SRAH-03A330 VRAH-03A330 2.5V 12V 3A 7.5W 88% SRAH-03A250 VRAH-03A250 1.8V 12V 3A 5.4W 85% SRAH-03A180 VRAH-03A180 1.5V 12V 3A 4.5W 84% SRAH-03A150 VRAH-03A150 ©2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 1 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 12V Input / 1.5V – 5.0V Output / 3A BP05xRAH-03A Absolute Maximum Ratings Parameter Max Unit -0.3 13.2 V Vouten -0.3 13.2 V Ambient Temperature Tamb -40 85 °C Storage Temperature Tstor -40 125 °C Continuous Input Voltage Output Enable Terminal Voltage Symbol Min Vin Typical Note: Use beyond the maximum ratings may cause a reliability degradation of the DC/DC converter or may permanently damage the device. Input Specifications Parameter Operating Input Voltage Module Symbol Min All Vin 10.8 Input Current Typical Max Units 13.2 V A Iin No Load Input Current 5.0V 3.3V 2.5V 1.8V 1.5V 1.7 1.2 0.9 0.75 0.6 All 100 mA 10 mA 3 Remote Off Input Current Input Reflected Ripple Current1 All 30 mArms Input Reflected Ripple Current (P-P)1 All 140 mApk I2t Inrush Current Transient All 0.005 Turn On Voltage Threshold All 9.4 Turn Off Voltage Threshold All 8.0 9.0 0.01 A2s V 10.0 V Note: Input capacitance 270µF/16V, ESR = 0.03 Ω max at 100kHz @ 25° C. 1. With simulated source impedance of 500nH, 5Hz to 20MHz. ©2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 2 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 12V Input / 1.5V – 5.0V Output / 3A BP05xRAH-03A Output Specifications Parameter Module Min Typical Max 4.920 3.247 2.460 1.771 1.476 5.0 3.3 2.5 1.8 1.5 5.080 3.353 2.540 1.829 1.524 5.0V 3.3V 2.5V 1.8V 1.5V 10 10 5 5 5 16.5 16.5 10 10 10 5.0V 3.3V 2.5V 1.8V 1.5V 10 5 3 3 3 16 10 5 5 5 5.0V 3.3V 2.5V 1.8V 1.5V 20 12 8 5 5 30 25 20 10 10 5.0V 3.3V 2.5V 1.8V 1.5V 40 27 16 13 13 62.5 51.5 35 25 25 Output Ripple and Noise 2 All 40 100 mVp-p Output Ripple and Noise 2 All 10 20 mVrms Output Current Range All Iout 0 3 A Output DC Current Limit All Ioutlim 3.6 7.5 A Shor t Circuit Surge All Ioutsurge 0.35 0.7 A 2s Turn on Time All Ton 12 20 ms Overshoot at Turn On 3 All 0 3 % Output Capacitance All 1200 µF Output Voltage Set Point 1 Symbol Units Vout 5.0V 3.3V 2.5V 1.8V 1.5V V mV Load Regulation mV Line Regulation mV Regulation Over Temperature mV Total Output Voltage Regulation Cout 0 Note: All specifications are typical at nominal input, full load at 25° C unless otherwise stated. 1. Vin = 12V, Iout = full load, Ta = 25° C. 2. 0 - 20 MHz, 0.1µF ceramic cap on output. 3. Overshoot at turn on output capacitance is 100µF. ©2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 3 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 12V Input / 1.5V – 5.0V Output / 3A BP05xRAH-03A Output Specifications Parameter Module Transient Response Symbol Min Typical Max Units 100 200 mV 40 80 µs 100 200 mV 40 80 µs 80 150 mV 40 80 µs 80 150 mV 40 80 µs 70 100 mV 40 80 µs 70 100 mV 40 80 µs 70 100 mV 40 80 µs 70 100 mV 40 80 µs 70 100 mV 40 80 µs 70 100 mV 40 80 µs 4 ∆V 50% to 100% of Max Load Settling Time Ts 5.0V ∆V 100% to 50% of Max Load Settling Time Ts Transient Response 4 ∆V 50% to 100% of Max Load Settling Time Ts 3.3V ∆V 100% to 50% of Max Load Settling Time Ts Transient Response 4 ∆V 50% to 100% of Max Load Settling Time Ts 2.5V ∆V 100% to 50% of Max Load Settling Time Ts Transient Response 4 ∆V 50% to 100% of Max Load Settling Time Ts 1.8V ∆V 100% to 50% of Max Load Settling Time Ts Transient Response 4 ∆V 50% to 100% of Max Load Settling Time Ts 1.5V ∆V 100% to 50% of Max Load Settling Time Ts Note: All specifications are typical at nominal input, full load at 25° C unless otherwise stated. 4. di/dt = 0.5A/1µS, Ta = 25° C without external load capacitance. ©2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 4 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 12V Input / 1.5V – 5.0V Output / 3A BP05xRAH-03A General Specifications Parameter Module Symbol Min Typical 89 88 86 83 82 91 90 88 85 84 5.0V 3.3V 2.5V 1.8V 1.5V 470 340 270 270 270 500 370 300 300 300 Output Voltage Trim Range2 All 90 Weight All Max Units η Efficiency1 % 5.0V 3.3V 2.5V 1.8V 1.5V Switching Frequency Fsw kHz 530 400 330 330 330 110 % 4.9 g 1. Vin=12V, full load and Ta=25° C. 2. See graphs on pages 11 - 13. Control Specifications Parameter Remote On/Off 3 Module Symbol All Vouten Min Typical Max Units V Signal Low (Unit Off) All -0.3 1 V Signal High (Unit On) All 2.8 13.2 V 3. With remote on/off pin 1 open, the module is on. ©2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 5 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 12V Input / 1.5V – 5.0V Output / 3A BP05xRAH-03A Efficiency Data Module 3.3V Module 5.0V 100% 100% 90% 10.8V 80% 12.0V 13.2V Efficiency Efficiency 90% 80% 10.8V 12.0V 70% 13.2V 70% 60% 60% 0.30 0.75 1.50 2.25 50% 0.30 3.00 0.75 Output Current 1.50 2.25 3.00 Output Current Module 2.5V 100% Efficiency 90% 10.8V 80% 12.0V 70% 13.2V 60% 50% 0.30 0.75 1.50 2.25 3.00 Output Current Module 1.5V 100% 100% 90% 90% 80% 10.8V 70% 12.0V 13.2V 60% Efficiency Efficiency Module 1.8V 80% 10.8V 12.0V 70% 13.2V 60% 50% 50% 40% 1 2 3 4 5 Output Current 40% 0.30 0.75 1.50 2.25 3.00 Output Current Note: On/off pin designed to work with an open collector/drain switch. ©2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 6 NON-ISOLATED DC/DC CONVERTERS 12V Input / 1.5V – 5.0V Output / 3A POWER PRODUCTS BP05xRAH-03A Ripple and Noise 0.1µF ceramic cap added at the output. Ripple and noise at full load and 12Vdc input, 5.0Vdc output and Ta=25° C Ripple and noise at full load and 12Vdc input, 3.3Vdc output and Ta=25° C Ripple and noise at full load and 12Vdc input, 2.5Vdc output and Ta=25° C Ripple and noise at full load and 12Vdc input, 1.8Vdc output and Ta=25° C Ripple and noise at full load and 12Vdc input, 1.5Vdc output and Ta=25° C ©2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 7 POWER PRODUCTS NON-ISOLATED DC/DC CONVERTERS 12V Input / 1.5V – 5.0V Output / 3A BP05xRAH-03A Transient Response Transient response: di/dt = 0.5A/µS, no external load capacitance Vout=5.0V 50% to 100% load transients at 12V input and Ta=25° C Vout=5.0V 100% to 50% load transients at 12V input and Ta=25° C Vout=3.3V 50% to 100% load transients at 12V input and Ta=25° C Vout=3.3V 100% to 50% load transients at 12V input and Ta=25° C ©2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 8 NON-ISOLATED DC/DC CONVERTERS 12V Input / 1.5V – 5.0V Output / 3A POWER PRODUCTS BP05xRAH-03A Transient Response Transient response: di/dt = 0.5A/µS, no external load capacitance Vout=2.5V 50% to 100% load transients at 12V input and Ta=25° C Vout=2.5V 100% to 50% load transients at 12V input and Ta=25° C Vout=1.8V 50% to 100% load transients at 12V input and Ta=25° C Vout=1.8V 100% to 50% load transients at 12V input and Ta=25° C ©2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 9 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 12V Input / 1.5V – 5.0V Output / 3A BP05xRAH-03A Transient Response Transient response: di/dt = 0.5A/µS, no external load capacitance Vout=1.5V 50% to 100% load transients at 12V input and Ta=25° C Vout=1.5V 100% to 50% load transients at 12V input and Ta=25° C Thermal Considerations xRAH-03A150 xRAH-03A180 xRAH-03A500 xRAH-03A250 xRAH-03A330 100LFM Derating Curve 3 200LFM 3 Output Current (A) Output Current (A) Derating Curve 200LFM 2 1 2 Natural Convection 1 Natural Convection 0 0 0 10 ©2005 Bel Fuse Inc. 20 30 40 50 60 70 85 0 10 20 30 40 50 60 Ambient Temperature, Ta (˚C) Ambient Temperature, Ta (˚C) Output Current vs. Local Ambient Temperature and Air Velocity Output Current vs. Local Ambient Temperature and Air Velocity 70 Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 10 85 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 12V Input / 1.5V – 5.0V Output / 3A BP05xRAH-03A Output Voltage Set-Point Adjustment Trim Down Test Circuit Trim Up Test Circuit Vo Vo Trim Trim Gnd Gnd Output Voltage Set-Point Adjustment xRAH-03A500 Trim Resistor Calculation Rtrim down = ( 23.703 – 13.87) Kohm Vo – Vo, adj Trim resistor value Rtrim_down(Kohm) 300 270 240 210 180 150 120 90 60 30 0 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 Adjusted output voltage Vo,adj (V) 5.05 5.1 5.15 5.2 5.25 5.3 5.35 Adjusted output voltage Vo,adj(V) 4.9 4.95 5 Rtrim up = ( 4.496 – 8.25) Kohm Vo, adj – Vo Trim resistor value,Rtrim_up(Kohm) 300 270 240 210 180 150 120 90 60 30 0 5 ©2005 Bel Fuse Inc. 5.4 5.45 5.5 Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 11 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 12V Input / 1.5V – 5.0V Output / 3A BP05xRAH-03A Output Voltage Set-Point Adjustment Rtrim down = ( 7.92 – 4.38) Kohm Vo – Vo, adj Trim resistor value Rtrim_down(Kohm) xRAH-03A330 Trim Resistor Calculation 300 270 240 210 180 150 120 90 60 30 0 2.97 3 3.04 3.33 3.37 3.07 3.1 3.13 3.17 3.2 3.23 Adjusted output voltage Vo,adj (V) 3.27 3.3 2.536 – 1.21) Kohm Vo, adj – Vo ( Rtrim up = Trim resistor value,Rtrim_up(Kohm) 300 270 240 210 180 150 120 90 60 30 0 3.3 3.4 3.43 3.46 3.5 3.53 Adjusted output voltage Vo,adj(V) 3.56 3.6 3.63 Trim resistor value Rtrim_down(Kohm) 300 270 240 xRAH-03A250 Trim Resistor Calculation 210 180 150 120 Rtrim down = 90 60 ( 3.694 – 7.77) Kohm Vo – Vo, adj 30 0 2.25 2.27 2.3 2.33 2.35 2.38 2.4 2.42 2.45 Adjusted output voltage Vo,adj (V) 2.48 2.5 Trim resistor value,Rtrim_up(Kohm) 300 270 240 210 180 150 120 Rtrim up = 90 ( 1.72 – 5.62) Kohm Vo, adj – Vo 60 30 0 2.5 2.52 ©2005 Bel Fuse Inc. 2.55 2.58 2.6 2.63 2.65 2.67 Adjusted output voltage Vo,adj(V) 2.7 2.73 2.75 Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 12 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 12V Input / 1.5V – 5.0V Output / 3A BP05xRAH-03A Output Voltage Set-Point Adjustment xRAH-03A180 Trim Resistor Calculation Rtrim down = ( 3.849 – 19.23) Kohm Vo – Vo, adj Trim resistor value Rtrim_down(Kohm) 300 270 240 210 180 150 120 90 60 30 0 1.62 1.64 1.66 1.82 1.84 1.67 1.69 1.71 1.73 1.75 1.76 Adjusted output voltage Vo,adj (V) 1.78 1.8 Rtrim up = ( Trim resistor value,Rtrim_up(Kohm) 300 3.064 – 15.4) Kohm Vo, adj – Vo 270 240 210 180 150 120 90 60 30 0 1.8 1.85 1.87 1.89 1.91 1.93 Adjusted output voltage Vo,adj(V) 1.94 1.96 1.98 Trim resistor value Rtrim_down(Kohm) 300 270 240 xRAH-03A150 Trim Resistor Calculation 210 180 150 120 Rtrim down = 90 60 ( 2.698 – 14.83) Kohm Vo – Vo, adj 30 0 1.35 1.37 1.38 1.4 1.41 1.43 1.44 1.46 1.47 Adjusted output voltage Vo,adj (V) 1.49 1.5 Trim resistor value,Rtrim_up(Kohm) 300 270 240 210 180 150 Rtrim up = 120 90 ( 3.064 – 11) Kohm Vo, adj – Vo 60 30 0 1.5 1.51 1.53 1.54 1.56 1.58 1.59 1.61 Adjusted output voltage Vo,adj(V) 1.62 1.64 1.65 ©2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 13 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 12V Input / 1.5V – 5.0V Output / 3A BP05xRAH-03A Mechanical SRAH-03A Suggested PCB Pad Layout 0.400 [10.16] 0.60 [15.24] 0.065 [1.65] 0.110 [2.79] 0.855 [21.72] 0.050 [1.27] R0.015 [R0.38] typ 0.70 [17.78] R0.008 [R0.20] typ 0.100 [2.54] 0.012 [0.30] 0˚-5˚ 0.004 [0.10] 0.050 [1.27] 0.100 [2.54] 4x 0.400 [10.16] 0.320 [8.13] 0.020 [0.51] 0.055 [1.40] 2x 0.090 [2.29] 2x 0.780 [19.81] Dimensions are in inches [millimeters]. Standard dimension tolerance is ±0.005 [0.13] unless otherwise noted. ©2005 Bel Fuse Inc. Pin Function 1 Remote On/Off 2 +Vin 3 Ground 4 +Vo 5 Trim 6 No Connection 7 No Connection 7 6 1 2 3 4 5 Specifications subject to change without notice. 07.05 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 14 NON-ISOLATED DC/DC CONVERTERS 12V Input / 1.5V – 5.0V Output / 3A POWER PRODUCTS BP05xRAH-03A Mechanical 0.700 [17.78] VRAH-03A 0.050 [1.27] 0.600 [15.24] 0.265 [6.73] min 0.050 [1.27] 0.100 [2.54] 0.400 [10.16] 0.020 [0.51] 0.308 [7.82] Dimensions are in inches [millimeters]. Standard dimension tolerance is ±0.005 [0.13] unless otherwise noted. Pin Function 1 Remote On/Off 2 +Vin 3 Ground 4 +Vo 5 Trim 1 2 3 4 5 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 240ºC. ©2005 Bel Fuse Inc. Specifications subject to change without notice. 07.05 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 page 15