NON-ISOLATED DC/DC CONVERTERS 3.3V Input / 1.2V – 2.5V Output / 8A POWER PRODUCTS BP02S7DB-08C S7DB-08C 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-08C 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. 8A maximum output is also provided. Standard features include remote on/off, 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 8A 20W 92% S7DB-08C250 1.8V 3.3V 8A 14.4W 88% S7DB-08C180 1.5V 3.3V 8A 12W 86% S7DB-08C150 1.2V 3.3V 8A 9.6W 83% S7DB-08C120 ©2002 Bel Fuse Inc. Specifications subject to change without notice. 08.02 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 / 8A BP02S7DB-08C 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 Iin Input Current No Load Input Current A 2.5V 1.8V 1.5V 1.2V 7.9 6.3 5.3 4.4 All 100 mA Remote Off Input Current 10 20 mA Input Reflected Ripple Current1 20 40 mArms Input Reflected Ripple Current (P-P)1 60 100 mApk I2t Inrush Current Transient 0.05 0.1 A2s Turn On Voltage Threshold 2.85 V Turn Off Voltage Threshold 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. 08.02 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 / 8A BP02S7DB-08C Output Specifications Parameter Module Min Typical Max 2.45 1.764 1.47 1.176 2.5 1.8 1.5 1.2 2.55 1.836 1.53 1.224 2.5V 1.8V 1.5V 1.2V 7.0 7.0 6.0 6.0 15 15 15 15 All 2.0 5 2.5V 1.8V 1.5V 1.2V 10 8 5 4 25 20 15 12 Output Voltage Set Point 1 Symbol Units V Vout 2.5V 1.8V 1.5V 1.2V Load Regulation mV Line Regulation mV Regulation Over Temperature mV mV Total Output Voltage Regulation 45 40 35 32 2.5V 1.8V 1.5V 1.2V Output Ripple and Noise 2 mVp-p 2.5V 1.8V 1.5V 1.2V 55 40 40 40 100 75 75 75 Output Ripple and Noise 2 All 10 25 mVrms Output Current Range Al l Iout 0 8 A Output DC Current Limit Al l Ioutlim 10.4 20 A A2s Ioutsurge Shor t Circuit Surge 2.5V 1.8V 1.5V 1.2V Turn on Time All Overshoot at Turn On Al l Output Capacitance Al l Ton Cout 0 0.06 0.07 0.09 0.15 0.12 0.14 0.18 0.22 10 20 ms 0 3 % 3200 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. 08.02 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 / 8A BP02S7DB-08C Output Specifications Parameter Module Transient Response Symbol Min Typical Max Units 110 150 mV 50 100 µs 110 150 mV 50 100 µs 90 125 mV 50 100 µs 90 125 mV 50 100 µs 90 125 mV 50 100 µs 90 125 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/1µS, Ta = 25° C with a 470µF Tantalum cap at output. ©2002 Bel Fuse Inc. Specifications subject to change without notice. 08.02 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 / 8A BP02S7DB-08C General Specifications Parameter Module Symbol Min Typical 89 85 83 80 92 88 86 83 250 300 Max Units η Efficiency1 % 2.5V 1.8V 1.5V 1.2V Switching Frequency All Fsw 340 kHz Output Voltage Trim Range2 % 2.5V 1.8V 1.5V 1.2V 105 110 110 110 80 90 90 90 % Remote Sense Compensation 5 10 10 10 2.5V 1.8V 1.5V 1.2V Weight 10.5 All g 1. Vin=3.3V, full load and Ta=25° C. 2. See graphs on pages 12-14. 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. 08.02 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 / 8A BP02S7DB-08C Efficiency Data Module 1.8V Module 2.5V 96% 93% 3.0V 3.3V 3.6V 92% 91% 90% Efficiency Efficiency 95% 94% 89% 88% 87% 1.0 2.0 3.0 4.0 93% 92% 91% 90% 89% 88% 87% 86% 85% 84% 83% 3.0V 3.3V 3.6V 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 5.0 6.0 7.0 8.0 Output Current Output Current Module 1.2V 92% 91% 90% 89% 88% 87% 86% 85% 84% 83% 82% 81% 80% 3.0V 3.3V 3.6V 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 O utput Current ©2002 Bel Fuse Inc. Efficiency Efficiency Module 1.5V 90% 89% 88% 87% 86% 85% 84% 83% 82% 81% 80% 79% 3.0V 3.3V 3.6V 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Output Current Specifications subject to change without notice. 08.02 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 6 NON-ISOLATED DC/DC CONVERTERS 3.3V Input / 1.2V – 2.5V Output / 8A POWER PRODUCTS BP02S7DB-08C Ripple and Noise 1µF ceramic cap and 10µF aluminum electrolytic cap are 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, 1.5Vdc 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, 1.2Vdc output and Ta=25° C ©2002 Bel Fuse Inc. Specifications subject to change without notice. 08.02 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 / 8A BP02S7DB-08C Transient Response Transient response: di/dt = 0.5A/µS, external load capacitance Co=470µF (Tantalum capacitor) Vout=2.5V 50% to 100% 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 ©2002 Bel Fuse Inc. Vout=2.5V 100% to 50% 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 Specifications subject to change without notice. 08.02 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 3.3V Input / 1.2V – 2.5V Output / 8A POWER PRODUCTS BP02S7DB-08C Transient Response Transient response: di/dt = 0.5A/µS, external load capacitance Co=470µF (Tantalum capacitor) 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 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 ©2002 Bel Fuse Inc. Specifications subject to change without notice. 08.02 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 / 8A BP02S7DB-08C Thermal Considerations Derating Curve 100LFM 200LFM Output Current (A) 8 300LFM 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 Output Voltage Set-Point Adjustment Trim Down Test Circuit Trim Up Test Circuit Vo Trim Gnd ©2002 Bel Fuse Inc. Vo Trim Gnd Specifications subject to change without notice. 08.02 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 / 8A BP02S7DB-08C Output Voltage Set-Point Adjustment S7DB-08C250 Trim Resistor Calculation ( Rtrim down = 9.590 – 14.29) Kohm Vo – Vo, adj T rim resistor value Rtrim_dow n(Kohm) 300 270 240 210 180 150 120 90 60 30 0 1.9 1.96 2.02 2.52 2.53 2.08 2.14 2.2 2.26 2.32 2.38 A djusted outp ut voltage Vo,adj (V) 2.44 2.5 Rtrim up = ( T rim resistor value,Rtrim_up(Kohm) 300 4.504 – 8.66) Kohm Vo, adj – Vo 270 240 210 180 150 120 90 60 30 0 2.5 2.54 2.56 2.58 2.59 2.61 Adjusted output voltage Vo,adj(V) 2.62 2.63 2.65 T rim resistor value Rtrim_dow n(Kohm) 300 270 240 S7DB-08C180 Trim Resistor Calculation 210 180 Rtrim down = 150 120 ( 3.869 – 12.5) Kohm Vo – Vo, adj 90 60 30 0 1.5 1.53 1.56 1.59 1.62 1.65 1.68 1.71 1.74 A djust ed outp ut voltage Vo,adj (V) 1.77 1.8 T rim resistor value,Rtrim_up(Kohm) 300 270 240 Rtrim up = 210 180 ( 3.072 – 8.66) Kohm Vo, adj – Vo 150 120 90 60 30 0 1.8 1.83 1.86 1.89 1.92 1.95 1.98 2.01 Adjusted output voltage Vo,adj(V) 2.04 2.07 2.1 ©2002 Bel Fuse Inc. Specifications subject to change without notice. 08.02 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 11 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 3.3V Input / 1.2V – 2.5V Output / 8A BP02S7DB-08C Output Voltage Set-Point Adjustment T rim resistor value Rtrim_down(Kohm) 300 S7DB-08C150 Trim Resistor Calculation Rtrim down = ( 2.712 – 12.5) Kohm Vo – Vo, adj 270 240 210 180 150 120 90 60 30 0 1.25 1.27 1.3 1.54 1.58 1.33 1.35 1.38 1.4 1.43 1.45 Adjust ed outp ut voltage Vo,adj (V) 1.48 1.5 Rtrim up = ( T rim resistor value,Rtrim_up (Kohm) 300 3.072 – 8.66) Kohm Vo, adj – Vo 270 240 210 180 150 120 90 60 30 0 1.5 300 1.62 1.66 1.7 1.74 1.78 Adjusted output voltage Vo,adj(V) 1.82 1.86 T rim resistor value Rtrim_down(Kohm) 270 240 S7DB-08C120 Trim Resistor Calculation 210 180 150 120 90 Rtrim down = 60 ( 1.562 – 8.48) Kohm Vo – Vo, adj 30 0 1 1.02 1.04 1.06 1.08 1.1 1.12 1.14 Adjusted output voltage Vo,adj (V) 1.16 1.18 1.2 300 T rim resistor value,Rtrim_up (Kohm) 270 240 210 180 Rtrim up = 150 120 ( 3.072 – 4.64) Kohm Vo, adj – Vo 90 60 30 0 1.2 1.22 ©2002 Bel Fuse Inc. 1.24 1.26 1.28 1.3 1.32 1.34 Adjusted output voltage Vo,adj(V) 1.36 1.38 1.4 Specifications subject to change without notice. 08.02 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com page 12 1.9 NON-ISOLATED DC/DC CONVERTERS POWER PRODUCTS 3.3V Input / 1.2V – 2.5V Output / 8A BP02S7DB-08C Mechanical 0.827 [21.00] 0.118 [3.00] 0.197 [5.00] 0.345 [8.75] 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 0.669 [17.00] 0.102 [2.60] 0.079 [2.00] 1.22 [31.00] 12 11 10 9 8 7 1 2 3 4 5 6 Dimensions are in inches [millimeters]. Standard dimension tolerance is ±0.005 [0.13] unless otherwise noted. ©2002 Bel Fuse Inc. Specifications subject to change without notice. 08.02 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