NON-ISOLATED DC/DC CONVERTERS 3.3V Input / 1.2V – 2.5V Output / 12A POWER PRODUCTS BP02S7DB-12C S7DB-12C Series • 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 • Remote sense Description The Bel S7DB-12C modules are a series of non-isolated, step down DC/DC power converters that operate from a nominal 3.3V source. These converters are available in a range of output voltages from 1.2V to 2.5V. They are packaged in a compact, low profile, surface mount DIP package for ease of layout and space savings. 12A maximum output is also provided. Standard features include remote on/off, remote sense, over current and short circuit protection, UVLO and output voltage adjust. These products may be used almost anywhere low voltage silicon is employed and a 3.3V 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 2.5V 3.3V 12A 30W 91% S7DB-12C250 1.8V 3.3V 12A 21.6W 87% S7DB-12C180 1.5V 3.3V 12A 18.0W 84% S7DB-12C150 1.2V 3.3V 12A 14.4W 82% S7DB-12C120 ©2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02 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 3.3V Input / 1.2V – 2.5V Output / 12A BP02S7DB-12C Absolute Maximum Ratings Parameter Max Unit -0.3 4 V Vouten -0.3 4 V Ambient Temperature Tamb -40 85 °C Storage Temperature Tstor -55 100 °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 Typical Max Units All Vin 3 3. 3 3.6 V Input Current Iin No Load Input Current A 2.5V 1.8V 1.5V 1.2V 12 9.5 8.2 6.7 All 100 mA 10 20 mA Remote Off Input Current Input Reflected Ripple Current1 All 25 50 mArms Input Reflected Ripple Current (P-P)1 All 80 160 mApk I2t Inrush Current Transient All 0.1 0.2 A2s Turn On Voltage Threshold All 2.85 V Turn Off Voltage Threshold All 2.3 V Note: Input capacitance two 270µF/10V, ESR = 0.018 Ω max at 100kHz @ 25° C. 1. With simulated source impedance of 500nH, 5Hz to 20MHz. ©2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02 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 3.3V Input / 1.2V – 2.5V Output / 12A BP02S7DB-12C Output Specifications Parameter Module Output Voltage Set Point 1 Symbol Min Typical Max 2.450 1.764 1.470 1.176 2.500 1.800 1.500 1.200 2.550 1.836 1.530 1.224 Units Vout 2.5V 1.8V 1.5V 1.2V V Load Regulation All 3.0 10 mV Line Regulation All 2.0 5 mV 2.5V 1.8V 1.5V 1.2V 19 13 11 9 38 27 23 18 mV Regulation Over Temperature mV Total Output Voltage Regulation 53 42 38 33 2.5V 1.8V 1.5V 1.2V Output Ripple and Noise 2 mVp-p 2.5V 1.8V 1.5V 1.2V 55 50 40 40 100 100 100 100 2.5V 1.8V 1.5V 1.2V 15 10 10 10 30 25 25 25 Output Ripple and Noise 2 mVrms Output Current Range All Iout 0 12 A Output DC Current Limit All Ioutlim 15.6 30 A Shor t Circuit Surge A 2s Ioutsurge 2.5V 1.8V 1.5V 1.2V Turn on Time All Overshoot at Turn On All Output Capacitance All Ton Cout 0 0.1 0.2 0.5 0.6 0.2 0.4 1 1.2 10 20 ms 0 3 % 4800 µF Note: All specifications are typical at nominal input, full load at 25° C unless otherwise stated. 1. Vin = 3.3V, Iout = full load, Ta = 25° C. 2. 0 - 20MHz, 1µF ceramic cap and 10µF aluminum cap on output. ©2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02 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 3.3V Input / 1.2V – 2.5V Output / 12A BP02S7DB-12C Output Specifications Parameter Module Transient Response Symbol Min Typical Max Units 110 150 mV 50 100 µs 110 150 mV 50 100 µs 100 150 mV 50 100 µs 100 150 mV 50 100 µs 100 150 mV 50 100 µs 100 150 mV 50 100 µs 90 125 mV 50 100 µs 90 125 mV 50 100 µs 3 ∆V 50% to 100% of Max Load Settling Time Ts 2.5V ∆V 100% to 50% of Max Load Settling Time Ts Transient Response 3 ∆V 50% to 100% of Max Load Settling Time Ts 1.8V ∆V 100% to 50% of Max Load Settling Time Ts Transient Response 3 ∆V 50% to 100% of Max Load Settling Time Ts 1.5V ∆V 100% to 50% of Max Load Settling Time Ts Transient Response 3 ∆V 50% to 100% of Max Load Settling Time Ts 1.2V ∆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. 3. di/dt = 0.5A/µS, Vin=3.3Vdc, Ta = 25° C, and with a 470µF (ESR=0.90 ohm) tantalum cap at output. ©2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02 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 3.3V Input / 1.2V – 2.5V Output / 12A BP02S7DB-12C General Specifications Parameter Module Symbol Min Typical 88 84 81 79 91 87 84 82 250 300 Max Units η Efficiency1 % 2.5V 1.8V 1.5V 1.2V Switching Frequency All Fsw kHz 340 Output Voltage Trim Range2 % 2.5V 1.8V 1.5V 1.2V Remote Sense Compensation All Weight All 90 90 90 90 105 110 110 110 % 10 10.5 g 1. Vin=3.3V, full load and Ta=25° C. 2. See graphs on pages 10-12. Total adjustment of trim, setpoint and remote sense combined should not exceed 5% at nominal Vin, 25°C ambient for the 2.5V output module. Control Specifications Parameter Remote On/Off 3 Module Symbol All Vouten Min Typical Max Units V Signal Low (Unit Off) All -0.3 0.8 V Signal High (Unit On) All 2.8 4 V 3. With remote on/off pin 8 open, the module is on. Note: On/off pin designed to work with an open collector/drain switch. ©2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02 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 3.3V Input / 1.2V – 2.5V Output / 12A BP02S7DB-12C Efficiency Data Module 2.5V Module 1.8V 97% 96% 96% 94% 95% 3.0V 93% 3.3V Efficiency Efficiency 92% 94% 3.6V 92% 3.0V 3.3V 90% 3.6V 88% 91% 86% 90% 84% 89% 1 2 3 4 5 6 7 8 9 10 11 12 1 13 2 3 4 5 6 Module 1.5V 8 9 10 11 12 92% 92% 90% 90% 88% 3.3V 3.6V Efficiency 88% 3.0V 3.0V 3.3V 86% 3.6V 86% 84% 84% 82% 80% 82% 1 2 3 4 5 6 7 8 9 10 11 12 Output Current ©2002 Bel Fuse Inc. 13 1 2 3 4 5 6 7 8 9 10 11 12 Output Current Specifications subject to change without notice. 10.02 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 6 13 Module 1.2V 94% Efficiency 7 Output Current Output Current 13 NON-ISOLATED DC/DC CONVERTERS 3.3V Input / 1.2V – 2.5V Output / 12A POWER PRODUCTS BP02S7DB-12C Ripple and Noise 1µF ceramic cap and 10µF aluminum electrolytic cap added at the output. Ripple and noise at full load and 3.3Vdc input, 2.5Vdc output and Ta=25° C Ripple and noise at full load and 3.3Vdc input, 1.8Vdc output and Ta=25° C Ripple and noise at full load and 3.3Vdc input, 1.5Vdc output and Ta=25° C Ripple and noise at full load and 3.3Vdc input, 1.2Vdc output and Ta=25° C ©2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02 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 3.3V Input / 1.2V – 2.5V Output / 12A BP02S7DB-12C Transient Response Transient response: di/dt = 0.5A/µS,external load capacitance Co=470µF (tantalum capacitor ESR=0.9 ohm) Vout=2.5V 50% to 100% load transients at 3.3V input and Ta=25° C Vout=2.5V 100% to 50% load transients at 3.3V input and Ta=25° C Vout=1.8V 50% to 100% load transients at 3.3V input and Ta=25° C Vout=1.8V 100% to 50% load transients at 3.3V input and Ta=25° C Vout=1.5V 50% to 100% load transients at 3.3V input and Ta=25° C Vout=1.5V 100% to 50% load transients at 3.3V input and Ta=25° C ©2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02 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 POWER PRODUCTS 3.3V Input / 1.2V – 2.5V Output / 12A BP02S7DB-12C Transient Response Transient response: di/dt = 0.5A/µS,external load capacitance Co=470µF (tantalum capacitor ESR=0.9 ohm) Vout=1.2V 50% to 100% load transients at 3.3V input and Ta=25° C Vout=1.2V 100% to 50% load transients at 3.3V input and Ta=25° C Thermal Considerations 100LFM 200LFM Derating Curve 300LFM Output Current (A) 12 10 8 6 4 Natural Convection 2 0 0 10 20 30 40 50 60 70 85 Ambient Temperature, Ta (˚C) Output Current vs. Local Ambient Temperature and Air Velocity ©2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02 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 3.3V Input / 1.2V – 2.5V Output / 12A BP02S7DB-12C Output Voltage Set-Point Adjustment Trim Down Test Circuit Trim Up Test Circuit Vo Vo Trim Trim Gnd Gnd Output Voltage Set-Point Adjustment Rtrimup = function S7DB-12C250 Trim Resistor Calculation Rtrim down = ( 7.544 – 13.52) Kohm Vo – Vo, adj Trim resistor value Rtrim_down(Kohm) 300 270 240 210 180 150 120 90 60 30 0 2 2.05 2.1 2.15 2.2 2.25 2.3 2.35 Adjusted output voltage Vo,adj (V) 0 2.5 2.53 2.56 2.59 2.62 2.65 2.68 2.71 Adjusted output voltage Vo,adj(V) 2.4 2.45 2.5 Rtrim up = ( 3.544 – 9.09) Kohm Vo, adj – Vo Trim resistor value,Rtrim_up(Kohm) 300 270 240 210 180 150 120 90 60 30 ©2002 Bel Fuse Inc. 2.74 2.77 2.8 Specifications subject to change without notice. 10.02 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 10 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 3.3V Input / 1.2V – 2.5V Output / 12A BP02S7DB-12C Output Voltage Set-Point Adjustment S7DB-12C180 Trim Resistor Calculation Rtrim down = ( 3.857 – 12.93) Kohm Vo – Vo, adj Trim resistor value Rtrim_down(Kohm) 300 270 240 210 180 150 120 90 60 30 0 1.5 1.53 1.56 1.8 1.83 1.86 1.59 1.62 1.65 1.68 1.71 1.74 Adjusted output voltage Vo,adj (V) 1.77 1.8 Rtrim up = ( Trim resistor value,Rtrim_up(Kohm) 300 3.072 – 9.09) Kohm Vo, adj – Vo 270 240 210 180 150 120 90 60 30 0 1.89 1.92 1.95 1.98 2.01 Adjusted output voltage Vo,adj(V) 2.04 2.07 2.1 Trim resistor value Rtrim_down(Kohm) 300 S7DB-12C150 Trim Resistor Calculation 270 240 210 180 150 Rtrim down = 120 90 ( 2.708 – 10.99) Kohm Vo – Vo, adj 60 30 0 1.3 1.32 1.34 1.36 1.38 1.4 1.42 1.44 1.46 Adjusted output voltage Vo,adj (V) 1.48 1.5 Trim resistor value,Rtrim_up(Kohm) 300 270 240 210 Rtrim up = 180 150 ( 3.072 – 7.15) Kohm Vo, adj – Vo 120 90 60 30 0 1.5 1.53 1.56 1.59 1.62 1.65 1.68 1.71 Adjusted output voltage Vo,adj(V) 1.74 1.77 1.8 ©2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 11 POWER PRODUCTS NON-ISOLATED DC/DC CONVERTERS 3.3V Input / 1.2V – 2.5V Output / 12A BP02S7DB-12C Output Voltage Set-Point Adjustment Rtrim down = ( 1.553 – 8.26) Kohm Vo – Vo, adj 300 Trim resistor value Rtrim_down(Kohm) S7DB-12C120 Trim Resistor Calculation 270 240 210 180 150 120 90 60 30 0 1 1.02 1.04 0 1.2 1.23 1.26 1.06 1.08 1.1 1.12 1.14 1.16 Adjusted output voltage Vo,adj (V) 1.18 1.2 Rtrim up = ( 3.072 – 4.42) Kohm Vo, adj – Vo Trim resistor value,Rtrim_up(Kohm) 300 270 240 210 180 150 120 90 60 30 ©2002 Bel Fuse Inc. 1.29 1.32 1.35 1.38 1.41 Adjusted output voltage Vo,adj(V) 1.44 1.47 Specifications subject to change without notice. 10.02 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 12 1.5 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 3.3V Input / 1.2V – 2.5V Output / 12A BP02S7DB-12C Mechanical 1.22 [30.99] Suggested PCB Pad Layout 0.394 [10.01] 0.197 [5.00] 0.895 [22.73] 0.67 [17.00] 0.100 [2.54] 0.120 [3.05] 0˚- 5˚ 0.004 [0.10] 5X 0.197 [5.00] 0.985 [25.02] 6X 0.102 [2.59] Pin Function 1 Ground 2 Ground 3 Ground 4 Ground 5 +Vin 6 +Vin 7 Trim 8 Remote On/Off 9 Remote Sense (+) 10 +Vo 11 +Vo 12 +Vo 0.345 [8.76] 0.010 [0.25] 2X 0.050 [1.27] 2X 0.079 [1.99] 0.827 [21.01] Dimensions are in inches [millimeters]. Standard dimension tolerance is ±0.005 [0.13] unless otherwise noted. 12 11 10 9 8 7 3 4 5 6 1 2 ©2002 Bel Fuse Inc. Specifications subject to change without notice. 10.02 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 13