NON-ISOLATED DC/DC CONVERTERS 12V Input / Programmable Output / 81A VRM 9.1 Compatible G7NB-81A180 PRELIMINARY • • High efficiency means less power dissipation Remote on/off • 2-Wire Remote sense • • 5 bit VID digital voltage programming. Single wire current sharing Description The G7NB-81A Series is a non-isolated step down DC/DC converters providing up to 81A of output current and designed to be compatible to the Intel VRM 9.1 specification. Standard features include current share, remote on/off, over current protection, remote sense and a power good signal. This product also makes use of adaptive positioning to improve transient response performance. These products may be used almost anywhere lowvoltage silicon is being employed and a nominal 12V source is available. Typical applications include file servers, work stations and other computing applications. Input Specifications Parameter Input Voltage Range Input Current (disabled) Input Current (full load) Reflected Ripple Current Min 10.8 VDC Typ Max 13.2 VDC Notes 17mA 16A 500mA rms With 100uF, 25mOhm capacitor and 200nH of input inductance. Output Specifications Parameter Output Current Set Point Accuracy Min 0A 1.81V Adaptive Positioning (Droop Impedance) Typ 1.83 Notes no load, excluding Adaptive positioning, VID 00000 800 uOhm Ripple and Noise 20mV Turn on Time Transient Response 8mS Deviation Settling Time pk-pk, 0 to 20MHz Bandwidth Full load with two external 560uF oscon capacitors on output. 16mS di/dt = 5A/uS 30A Load step 100mV 175uS Remote Sense Compensation Output Capacitance Max 81A 1.85 ±0.3VDC 4400uF 9000uF For applications requiring higher or lower output capacitance please consult factory. 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 12V Input / Programmable Output / 81A VRM 9.1 Compatible General Specifications Pin Connections Parameter Switching Frequency Dimensions Specification 1 MHz typical (fixed) inches mm Row A Pin 3.8 x 1.35 x .59 96.5 x 34.3 x 15 TBD 0°C to 70°C -40°C to 100°C Weight Operating Temperature Non-Operating Temperature Protection Features Over current Undervoltage Remote On/Off Efficiency (full load) 1.85V output 110% to 170% max Io UVLO Vin < 10.8V Active High 86% Voltage Identification (VID) Code VID4 VID3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 VID2 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 VID1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 VID0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 Vo (VDC) 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Output Off 1.1 1.125 1.15 1.175 1.2 1.225 1.25 1.275 1.3 1.325 1.35 1.375 1.4 1.425 1.45 1.475 1.5 1.525 1.55 1.575 1.6 1.625 1.65 1.675 1.7 1.725 1.75 1.775 1.8 1.825 1.85 Function Row B Pin Function 1 VIN+ 62 VIN2 VIN+ 61 VIN3 VIN+ 60 VIN4 VIN+ 59 VIN5 NC 58 VIN6 NC 57 VID4 7 VID3 56 VID2 8 VID1 55 VID0 9 Memory 54 Ishare 10 PWRGD 53 OUTEN 11 VO-sen52 VO-sen+ 12 No Pin 51 No Pin 13 VO50 VO+ 14 VO+ 49 VO+ 15 VO48 VO16 VO+ 47 VO+ 17 VO46 VO18 VO+ 45 VO+ 19 VO44 VO20 VO+ 43 VO+ 21 VO42 VO22 VO+ 41 VO+ 23 VO40 VO24 VO+ 39 VO+ 25 VO38 VO26 VO+ 37 VO+ 27 VO36 VO28 VO+ 35 VO+ 29 VO34 VO30 VO+ 33 VO+ 31 VO32 VONotes: 1. Mechanical key between pins 11 & 12 and 51 & 52 2. Pin 6 is electrical key. 2003 Bel Fuse Inc. Specifications subject to change without notice. 011202 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