NON-ISOLATED DC/DC CONVERTERS 13.2 Vdc Max Input, 0.8 Vdc – 3.6 Vdc/25 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Feb. 21, 2012 SRBB-20A1A0 RoHS Compliant Rev.F Features Non-Isolated Low Cost High Efficiency High Power Density Class 2, Category 2, Non-Isolated DC/DC Converter (refer to IPC-9592A) Applications Telecommunications Networking Computers and Peripherals Description The Bel SRBB-20A1A0 is a non-isolated dc to dc converter . The module use a SMD package. This converter is available in a range of output voltages from 0.8Vdc to 3.6Vdc over a wide range of input voltage. Part Selection Output Voltage Input Voltage Max. Output Power 25W Typical Efficiency 13.2 Vdc Max Max. Output Current 25 A 0.8 Vdc – 3.6 Vdc 0.8 Vdc – 3.6 Vdc 0.8 Vdc – 3.6 Vdc Model Number 86.2%(Vo=1V) SRBB-20A1A0 13.2 Vdc Max 20A 36W 91.5%(Vo=1.8V) SRBB-20A1A0 13.2 Vdc Max 20A 66W 94.0%(Vo=3.3V) SRBB-20A1A0 Notes: Add “G” suffix at the end of the model number to indicate Tray Packaging. Part Number Explanation S R BB – 20 A 1A 0 1 2 3 4 5 6 7 1---SMD package 2---RoHS 6, change “R” to “7” means RoHS 5 3---Series name 4---Series code 5---Wide input range (13.2V Max) 6---Output voltage (0.8-3.6V) 7---Standard option Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com 1 NON-ISOLATED DC/DC CONVERTERS 13.2 Vdc Max Input, 0.8 Vdc – 3.6 Vdc/25 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Feb. 21, 2012 Absolute Maximum Ratings Min Typ Max Unit - - 15.0 V Voltage at Pin10 (+5V) 4.5 - 6.0 V Voltage at Pin8 (PWM) 2.0 - 6.0 V Ambient Temperature -20 - 70 C Storage Temperature -40 - 100 C Parameter Continuous Input Voltage Notes Note: Ratings used beyond the maximum ratings may cause a reliability degradation of the converter or may permanently damage the device. Input Specifications Parameter Min Typ Max Unit 7.0 - 13.2 V Input Current - - 10.14 A Input Current (no load) - - 80 mA - - 1 As - 60 - uF +5V (Pin10) Operating 4.5 5.0 5.5 V +5V (Pin10) Under-voltage lockout,rising 2.9 - 4.5 V +5V (Pin10) Under-voltage lockout,falling 2.5 - 4.3 V +5V (Pin10) Hysteresis - 0.4 - V +5V (Pin10) Current(switching at 500KHz) - 30 - mA PWM (Pin8) High 2.4 - 5.5 V PWM (Pin8) Low -0.3 - 0.7 V -1 - 1 uA Operating Input Voltage 2 I t Inrush Current Transient 1,2 Input Capacitance PWM (Pin8) Tri-state current Notes test at Vin=7V,Vo=3.3V/20A 2 Sourcing or sinking current to/from PWM(Pin 8) without the specified range will result in both high and low-side MOSFET's to be held off by the gate-driver circuitry. Notes: 1. 6x 10uF/16V on power block. 2. Additional input capacitors are to be added externally as part of the buck regulator design. Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com 2 NON-ISOLATED DC/DC CONVERTERS 13.2 Vdc Max Input, 0.8 Vdc – 3.6 Vdc/25 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Feb. 21, 2012 Output Specifications Parameter Output Current Range Output Capacitance 1 2,3 Output-to-GND Resistor Inductor 4,5 Min Typ Max Unit - 25 A Vo=1.0V - 20 A Vo=1.8V - 20 A Vo=3.3V - 20 - uF - 301 - Ω 333 370 407 nH 0.651 0.7 0.749 mΩ - 35.0 - A 0 Notes Use 301R 1% 0805 Resistor. 15% change in inductance from 0A & 125°C) Notes: 1. 0.8V to 3.6V output, 7V to 12V input, switching at 500kHz. 2. (2x)10uF/6.3V/X7R/0805 + (1x)0.1uF/16V/X7R/0402 on power block. 3. Additional output capacitors are to be added externally as part of the buck regulator design. 4. See Block Diagram for DCR sense requirements. 5. All specifications are typical at nominal input, 25°C unless otherwise stated. General Specifications Parameter Min Typ Max Unit Notes - 94.0 91.5 86.2 - % % % 0.8 - 3.6 V - 495 - uA Bias current sourced from controller(into Pin 7) 1.345 1.35 1.355 V Voltage at 25℃(Pin 7) -3.9 -4.4 -5.0 mV/C Temperature coefficient( 0 to 130℃) MTBF - 66M - hours Calculated according to Telcordia SR332 at 40C rated-load Weight - 6.2 - g 1,2 Efficiency Vo=3.3V Vo=1.8V Vo=1.0V Output Voltage range Temperature Sense FIT 15.12 - 0.67 x 0.50 x 0.48 17.02 x 12.70 x 12.20 - Calculated according to Telcordia SR9 332 at 40C rated-load(FIT=10 /MTBF) Dimensions Inches (L × W × H) Millimeters (L × W × H) Notes: 1. 1V/25A,1.8V/20A,3.3V/20A output,7V to 12V input,switching at 500KHz,with 200LFM at 55C. 2. Gate drive and controller losses are included.For the purpose of this calculation,controller loss is assumed to be 0.2W. Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com 3 NON-ISOLATED DC/DC CONVERTERS 13.2 Vdc Max Input, 0.8 Vdc – 3.6 Vdc/25 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Feb. 21, 2012 Efficiency Data 91.0% EFFICIENCY 89.0% 87.0% 85.0% 83.0% 7V 12 V 81.0% 13.2 V 79.0% 77.0% 75.0% 2.50 6.25 12.50 18.75 25.00 OUTPUT CURRENT(A) EFFICIENCY Vo=1.0V 95.0% 93.0% 91.0% 89.0% 87.0% 85.0% 83.0% 81.0% 79.0% 77.0% 75.0% 7V 12 V 13.2 V 2.00 5.00 10.00 15.00 20.00 OUTPUT CURRENT(A) Vo=1.8V 100.0% EFFICIENCY 95.0% 90.0% 7V 12 V 85.0% 13.2 V 80.0% 75.0% 2.00 5.00 10.00 15.00 20.00 OUTPUT CURRENT(A) Vo=3.3V Note: 1.Efficiency is at Rated Current, Vin = 7V to 12V, switching at 500KHz, Tamb = 55degC, Airflow = 200LFM in any direction, unit temperature stabilized 2.Controller and gate-drive losses are included. For the purposes of this calculation use 200mW for controller losses Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com 4 NON-ISOLATED DC/DC CONVERTERS 13.2 Vdc Max Input, 0.8 Vdc – 3.6 Vdc/25 A Output Feb. 21, 2012 Bel Power Inc., a subsidiary of Bel Fuse Inc. Thermal Derating Curve Maximum junction temperature of semiconductors derated to 120 degree C. Vin=12V, Vout=1V, lo=25A Vin=12V, Vout=1.8V , lo=20A Vin=12V, Vout=3.3V, lo=20A Temperature reference points on top side Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com 5 NON-ISOLATED DC/DC CONVERTERS 13.2 Vdc Max Input, 0.8 Vdc – 3.6 Vdc/25 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Feb. 21, 2012 Temperature Sense Temperature vs Voltage of Temp 1.6000 Voltage of Temp (V) 1.4000 1.2000 1.0000 0.8000 0.6000 0.4000 0.2000 0.0000 0 12.5 25 37.5 50 62.5 75 87.5 100 112.5 125 Temperature (C) Block Diagram The capacitor from Cs+ to Cs- will not be stuffed, but footprint is to be left on the unit. Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com 6 NON-ISOLATED DC/DC CONVERTERS 13.2 Vdc Max Input, 0.8 Vdc – 3.6 Vdc/25 A Output Feb. 21, 2012 Bel Power Inc., a subsidiary of Bel Fuse Inc. Layout Layout of components on top side Layout of components on bottom side Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com 7 NON-ISOLATED DC/DC CONVERTERS 13.2 Vdc Max Input, 0.8 Vdc – 3.6 Vdc/25 A Output Feb. 21, 2012 Bel Power Inc., a subsidiary of Bel Fuse Inc. Mechanical Outline Pin Function 1 Vin 2 Enable 3 5 Cs+ CsVo Positive DCR sense Negative DCR sense Output voltage 6,9 GND Ground for both input and output 7 Temp From temperature sense device on the power block 8 PWM PWM signal to the gate driver 10 +5V 4 Pin size Input voltage for the MOSFET Turn Off Module (Enable < 0.8V), Turn On Module (Enable > 2.0V) Input voltage for gate driver Note: This module is recommended and compatible with Pb-Free Reflow Soldering and must be soldered using a reflow profile with a peak temperature of no more than 260 ºC for less than 5 seconds. Note: 1) All Pins: Material - Copper Alloy; Finish – 3 micro inches minimum Gold over 50 micro inches minimum Nickel plate. 2) Undimensioned components are shown for visual reference only. 3) All dimensions in inches (mm); Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm). Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com 8 NON-ISOLATED DC/DC CONVERTERS 13.2 Vdc Max Input, 0.8 Vdc – 3.6 Vdc/25 A Output Bel Power Inc., a subsidiary of Bel Fuse Inc. Feb. 21, 2012 Revision History Date Revision Changes Detail Approval 2009-07-17 A First release 2009-12-14 B 1.update efficiency curve; 2.add TD; 3.update ME XF Jiang 2009-12-16 C 1. Remove “Preliminary”; 2.add input current at full load; 3. Add XF Jiang Han word “Max” with the model height 0.48’’ in ME. 2010-08-17 D 1. Update mechanical drawing, voltages of pins, efficiency data, temperature sense and block diagram; 2. Add Layout; 3. Delete TD XF Jiang 2012-1-18 E Updated efficiency data XF Jiang 2012-2-21 F Cover, Abs Max, Input Specs, Output Specs, General, Efficiency data, TD, Temperature sense, MD, SCH XF Jiang RoHS Compliance Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products. 2012 Bel Fuse Inc. Specifications subject to change without notice. 022112 9 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