POWER LOSS (W) LTC7130 20V 20A Monolithic Buck Converter with Ultralow DCR Sensing FEATURES DESCRIPTION n Wide V Range: 4.5V to 20V IN The LTC 7130 is a current mode synchronous step-down n Optimized for Low Duty Cycle Applications monolithic converter that can deliver up to 20A continuous n High Efficiency: Up to 95% load current. It employs a unique architecture which enhances n LTC Proprietary Current Mode Architecture the signal-to-noise ratio of the current sense signal, allow- n High Current Parallel Operation ing the use of a very low DC resistance power inductor to n Ultralow DCR Current Sensing with maximize efficiency in high current applications. This feature TemperatureCompensation also reduces the switching jitter commonly found in low n Programmable Output Current Limit DCR applications. The LTC7130 also includes a high speed n High Speed Differential Remote Sense Amplifier differential remote sense amplifier and a programmable cur- n 0.5% Output Voltage Regulation Accuracy rent sense limit that can be selected from 10mV to 30mV to n set the output current limit up to 20A. In addition, the DCR Output Short-Circuit Protection with Soft Recovery n temperature compensation feature limits the maximum Programmable Soft-Start, Tracking n output current precisely over temperature. Programmable Fixed Frequency: 250kHz to 770kHz n EXTV for Reduced Power Dissipation CC The LTC7130 also features a precise 0.6V reference with a n Fault Indicator for Output UV/OV Conditions guaranteed limit of 0.5% that provides an accurate output n 6.25mm 7.5mm 2.22mm BGA Package voltage. A 5V to 20V input voltage range supports a wide variety of bus voltages and various types of batteries. APPLICATIONS The LTC7130 is offered in a compact and low profile BGA pack- age available with SnPb/RoHS compliant terminal finishes. n DSP, FPGA, ASIC Reference Designs L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Module, Linear Technology and the Linear logo are n Telecom/Datacom Systems registered trademarks and No R is a trademark of Analog Devices, Inc. All other trademarks SENSE are the property of their respective owners. Protected by U.S. Patents, including 5481178, n Distributed High Power Density Systems 5705919, 5929620, 6177787, 6580258, 6498466, 6611131, patent pending. TYPICAL APPLICATION High Efficiency, 1.5V/20A Step-Down Converter with Very Low DCR Sensing Efficiency vs Load Current 2.2 100 14 V = 5V IN + 1F 4.7F TO 20V CMDSH2-3 90 470F 12 EFFICIENCY 80 INTV SVIN INTV ITEMP CC CC 0.25H 2.2 10 70 (0.37m V BOOST IN 3.01k PINS NOT USED DCR) V 0.1F OUT 60 ILIM 8 SW 1.5V IN THIS CIRCUIT: PGOOD 1k RUN 20A 50 3.09k + CLKOUT + V = 12V 6 SNSD IN MODE/PLLIN 470F 40 V = 1.5V 220nF OUT 2 ITH LTC7130 L = 0.25H (DCR = 0.37m) 30 4 SNS 220pF EXTV = 5V CC 220nF 20 CCM TK/SS + 1nF SNSA 2 0.1F 10 619 POWER LOSS EXTV CC DIFFP 20k 0 0 V 0 2 4 6 8 10 12 14 16 18 20 FB DIFFN 121k LOAD CURRENT (A) 20k 30.1k DIFFOUT SGND GND FREQ 7130 TA01b 7130 TA01a 7130fb 1 For more information www.linear.com/LTC7130 EFFICIENCY (%)LTC7130 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Input Supply Voltage .................................. 0.3V to 20V 1 2 3 4 5 6 7 EXTV , RUN, PGOOD ................................. 0.3V to 6V CC NC1 DIFFN DIFFP DIFFOUT ITH NC2 V FB + + A SNSD , SNSA , SNS Voltages .............0.3V to INTV CC + SNSD SNS TK/SS RUN FREQ MODE/PLLIN, ILIM, TK/SS, FREQ .........0.3V to INTV CC B DIFFP, DIFFN .........................................0.3V to INTV MODE/ CC + SGND SNSA ILIM CLKOUT PGOOD PLLIN ITEMP, ITH, V Voltages ......................0.3V to INTV C FB CC Operating Junction Temperature Range INTV ITEMP CC SV EXTV IN CC D (Note 2) .................................................. 40C to 125C GND Storage Temperature Range .................. 65C to 150C E Peak Solder Reflow Body Temperature .................260C V IN BOOST F G GND SW H J BGA PACKAGE 63-PIN (6.25mm 7.5mm 2.22mm) T = 125C, = 21C/W, = 10C/W JMAX JA JC DERIVED FROM LTC7130 DEMO BOARD, Weight = 0.24g JA ORDER INFORMATION (