NON-ISOLATED DC/DC CONVERTERS 12V Input / Programmable Output / VRM11 Compatible GRND-55A160 PRELIMINARY RoHS Compliant • High efficiency means less power dissipation • Remote on/off • Wide input range (7.5 – 13.2V) • I2C/SMbus available – consult factory • 2-Wire Remote sense • 7 bit VID digital voltage programming. Description The GRND-55A Series is a non-isolated step down DC/DC converter providing up to 55A of output current and designed to be compatible with the Intel VRM11 requirements. Standard features include remote on/off, over current protection, remote sense, VR_Fan signal, VR_Hot signal 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 low-voltage silicon is being employed and a nominal 12V source is available. Typical applications include file servers, work stations and other computing applications. Part Selection Output Voltage 0.82 – 1.60V Input Voltage 12V Output Current (Thermal Design) 45A Output Current (Peak Current) 55A Typical Efficiency 85% Model Number GRND-55A160 Input Specifications Parameter Input Voltage Range Min 7.5 VDC Input Current (disabled) Input Current (full load) Reflected Ripple Current Typ Max 13.2 VDC Notes UVLO-on(max) = 7.5V UVLO-off(max) = 6.1V 17mA 15.5A 400mA rms Vin=5.5V, Vout=1.6V With 2 330uF, 25mOhm capacitor and 200nH of input inductance. Max 45A 55A 1.29V Notes Thermal design Peak current rating no load, excluding Adaptive positioning, VRM11 VID 0x32 Output Specifications Parameter Output Current Set Point Accuracy Min 0A Typ 1.27V 1.28V Adaptive Positioning (Droop Impedance) Ripple and Noise 1.25 mOhm Turn on Time Transient Response 15mS 20mV Deviation Settling Time 30mS di/dt = 5A/uS Load step =50% of max load. TBD TBD Remote Sense Compensation Output Capacitance pk-pk, 0 to 20MHz Bandwidth Full load. Note 3 ±0.3VDC See note 1,400uF See note Consult factory regarding external capacitance outside of this range 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 7.5 –13.2V Input / Programmable Output / 55A VRM11 General Specifications Parameter Switching Frequency Dimensions Pin Connections Specification TBD MHz typical (fixed) inches mm Weight Operating Temperature Non-Operating Temperature Protection Features Over current Undervoltage Remote On/Off Efficiency (full load) 1.3V output 45A load 3.8 x 1.055 x 0.393 96.5 x 26.8 x 9.98 TBD 0°C to 65°C -40°C to 100°C 110% to 170% max Io UVLO Vin < 6.0V Active High 85% Row A Pin 1 2 3 4 5 6 7 8 9 10 11 12 13-16 17-20 21-24 25-26 27-30 31-34 35-38 39-42 43-46 47-48 49-52 53-56 57-60 61-64 65-68 69-70 71-74 75-78 79-82 Function PWRGD Reserved OUTEN LL1 VID5 VID3 VID1 Reserved +SENSE Reserved VR_HOT IMON Key VIN GND VOUT GND VOUT GND VOUT GND VOUT GND VOUT GND VOUT GND VOUT GND VOUT GND VOUT Row B Pin 164 163 162 161 160 159 158 157 156 155 154 153 149-152 145-148 141-144 139-140 135-138 131-134 127-130 123-126 119-122 117-118 113-116 109-112 105-108 101-104 97-100 95-96 91-94 87-90 83-86 Function VBIAS Reserved LL0 VID6 VID4 VID2 VID0 Reserved -SENSE VIDSEL VRM_PRES Reserved Key VIN GND VOUT GND VOUT GND VOUT GND VOUT GND VOUT GND VOUT GND VOUT GND VOUT GND VOUT Notes: 1. Mechanical key between pins 12 & 13 and 152 & 153 2. Recommended mating connector Molex iCool P/N 87787-1011. 3. Measured with 2 X 560u 7mOhm ESR Al Poly and 28 X 10u 10mOHm ESR ceramic capacitors on output. 4. Leave Reserved pins floating in end use application. 2007 Bel Fuse Inc. Specifications subject to change without notice. 071106 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 NON-ISOLATED DC/DC CONVERTERS 12V Input / Programmable Output / VRM11 Compatible Signal Definitions Symbol Definitions VIN Input power to the converter GND Common return for both input and output VID0, VID1, VID2, VID3, VID4, VID5 VID6 Logic level inputs used to set the output voltage, refer to VID table. Connect VID0 thru VID6 pins to open-drain outputs with external pull-up resistors. Valid logic low is -0.3V to 0.4V, valid logic high level is 0.8V to 5.5V. VIDSEL Digital input used to select between extended VR10 and VR11 VID tables. +SENSE -SENSE The open drain power good signal indicates the output voltage is within 10% of the VID setpoint. Remote voltage sense lines. Connect these at the point of load, to VOUT and GND respectively. VOUT Output voltage available to the load. PWRGD Logic level input used to enable the converter when high. Valid logic low is -0.3V to 0.4V, valid logic high level is 0.8V to 5.5V. Load line select pins. Working in conjunction with VID_Select, LL0/LL1 are used to select load line slope. Currently only 1.25mohm slope is supported. Module can be configured LL0/LL1 to support multiple load line slopes. IMON Analog average load current signal, scaling TBD. VBIAS 3.3V Bias input. 3.1 – 3.5V, 200mA max, required for operation of unit. Open-drain output signal, pulled actively low indicating a thermal event has been VR_HOT detected on the VRM VRM_PRES Signal used by system to indicate the VRM is present in the design. OUTEN 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 7.5 –13.2V Input / Programmable Output / 55A VRM11 VRM11.0 VID Codes HEX 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 1 2 3 4 5 6 7 8 9 A B C D E F Vo (VDC) Off Off 1.60000 1.59375 1.58750 1.58125 1.57500 1.56875 1.56250 1.55625 1.55000 1.54375 1.53750 1.53125 1.52500 1.51875 1.51875 1.51250 1.50625 1.50000 1.49375 1.48750 1.48125 1.47500 1.46875 1.46250 1.45625 1.45000 1.44375 1.43750 1.43125 1.42500 1.41875 1.41250 1.40625 1.40000 1.39375 1.38750 1.38125 1.37500 1.36875 1.36250 1.35625 1.35000 1.34375 1.33750 1.33125 1.32500 HEX 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 1 2 3 4 5 6 7 8 9 A B C D E F Vo (VDC) 1.31250 1.30625 1.30000 1.29375 1.28750 1.28125 1.27500 1.26875 1.26250 1.25625 1.25000 1.24375 1.23750 1.23125 1.22500 1.21875 1.21250 1.20625 1.20000 1.19375 1.18750 1.18125 1.17500 1.16875 1.16250 1.15625 1.15000 1.14375 1.13750 1.13125 1.12500 1.11875 1.11250 1.10625 1.10000 1.09375 1.08750 1.08125 1.07500 1.06875 1.06250 1.05625 1.05000 1.04375 1.03750 1.03125 1.02500 1.01875 HEX 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 1 2 3 4 5 6 7 8 9 A B C D E F Vo (VDC) 1.01250 1.00625 1.00000 0.99375 0.98750 0.98125 0.97500 0.96875 0.96250 0.95625 0.95000 0.94375 0.93750 0.93125 0.92500 0.91875 0.91250 0.90625 0.90000 0.89375 0.88750 0.88125 0.87500 0.86875 0.86250 0.85625 0.85000 0.84375 0.83750 0.83125 0.82500 0.81875 Note: VIDs with VID7=1 not shown because this VRM does not have a VID7 pin. 2007 Bel Fuse Inc. Specifications subject to change without notice. 071106 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 NON-ISOLATED DC/DC CONVERTERS 12V Input / Programmable Output / VRM11 Compatible Mechanical Outline Drawing RoHS Compliance Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products. Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com