LTC7813 Low I , 60V Synchronous Q Boost+Buck Controller Fea T Descrip T n Synchronous Boost and Buck Controllers The LTC 7813 is a high performance synchronous n When Cascaded, Allows V Above, Below, or Equal Boost+Buck DC/DC switching regulator controller that IN to Regulated V of Up to 60V drives all N-channel power MOSFET stages. It contains OUT n Wide Bias Input Voltage Range: 4.5V to 60V independent step-up (boost) and step-down (buck) n Output Remains in Regulation Through Input Dips controllers that can regulate two separate outputs or be (e.g. Cold Crank) Down to 2.2V cascaded to regulate an output voltage from an input n Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) voltage that can be above, below, or equal to the output n Low EMI with Low Input and Output Ripple voltage. The LTC7813 operates from a wide 4.5V to 60V n Fast Output Transient Response input supply range. When biased from the output of the n No External Bootstrap Diodes Required boost regulator, the LTC7813 can operate from an input n High Light Load Efficiency supply as low as 2.2V after start-up. The 34A no-load n Low Operating I : 29A (One Channel On) quiescent current (both channels on) extends operating Q n Low Operating I : 34A (Both Channels On) runtime in battery-powered systems. Q n R or Lossless DCR Current Sensing SENSE Unlike conventional buck-boost regulators, the LTC7813s n Buck Output Voltage Range: 0.8V V 60V OUT cascaded Boost+Buck solution has continuous, non- n Boost Output Voltage Up 60V pulsating, input and output currents, substantially reducing n Phase-Lockable Frequency (75kHz to 850kHz) voltage ripple and EMI. The LTC7813 has independent n Small 32-Pin 5mm 5mm QFN Package feedback and compensation points for the boost and buck regulation loops, enabling a fast output transient response a T that can be externally optimized. n Automotive and Industrial Power Systems L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective n High Power Battery Operated Systems owners. Typical a T Wide Input Range to 10V/10A Low I Cascaded Boost+Buck Regulator Q V IN 2.2H 10H 8V TO 60V V , 12V** V MID OUT DOWN TO 10V 2.2V AFTER 10A* 6.8F 22F 22F 47F 47F START-UP 47F 3 4 3 1.62k 2.32k 15k R B1 33pF 332k 0.1F 1F 0.1F R 0.1F A1 11.5k SENSE2+ SENSE2 BG2 SW2 BOOST2 TG2 V V TG1 BOOST1 SW1 BG1 SENSE1+ SENSE1 V FB2 BIAS FB1 LTC7813 EXTV CC RUN1 RUN2 I I TRACK/SS1 SS2 FREQ PLLIN/MODE GND DRV INTV VPRG2 ILIM DRVUVDRVSET TH1 TH2 CC CC 7813 TA01 V IN 0.1F 8.87k 6.19k 4.7F 0.1F 37.4k 100pF 470pF 0.1F 3300pF 22nF * WHEN V <8V MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED IN **V = 12V WHEN V < 12V MID IN V FOLLOWS V WHEN VIN > 12V MID IN 7813f 1 For more information www.linear.com/LTC7813 ion pplica ions pplica ion uresLTC7813 a Te Maxi Mu M r a T p in c F T (Note 1) TOP VIEW Bias Input Supply Voltage (V ) .............. 0.3V to 65V BIAS Topside Driver Voltages BOOST1, BOOST2 .................................. 0.3V to 76V 32 31 30 29 28 27 26 25 Switch Voltage (SW1, SW2) .......................... 5V to 70V SW1 1 24 DRV CC DRV , (BOOST1-SW1), (BOOST2-SW2) ....0.3V to 11V CC TG1 2 23 SS2 BG1, BG2, TG1, TG2 ........................................... (Note 8) TRACK/SS1 DRVSET 3 22 RUN1, RUN2 Voltages ................................ 0.3V to 65V VPRG2 4 21 DRVUV 33 + + SENSE1 , SENSE2 , SENSE1 GND I 5 20 I TH1 TH2 SENSE2 Voltages ..................................... 0.3V to 65V V 6 19 V FB1 FB2 + PLLIN/MODE, FREQ, DRVSET Voltages ....... 0.3V to 6V SENSE1 7 18 ILIM SENSE1 8 17 RUN2 EXTV Voltage ......................................... 0.3V to 14V CC 9 10 11 12 13 14 15 16 ITH1, ITH2, V Voltages ............................ 0.3V to 6V FB1 V Voltage ............................................... 0.3V to 65V FB2 VPRG2 Voltage ............................................ 0.3V to 6V TRACK/SS1, SS2 Voltages ........................... 0.3V to 6V UH PACKAGE Operating Junction Temperature Range (Notes 2, 3) 32-LEAD (5mm 5mm) PLASTIC QFN T = 150C, = 44C/W JMAX JA LTC7813E, LTC7813I .......................... 40C to 125C EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB LTC7813H .......................................... 40C to 150C LTC7813MP ....................................... 55C to 150C Storage Temperature Range .................. 65C to 150C o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC7813EUH PBF LTC7813EUH TRPBF 7813 32-Lead (5mm 5mm) Plastic QFN 40C to 125C LTC7813IUH PBF LTC7813IUH TRPBF 7813 32-Lead (5mm 5mm) Plastic QFN 40C to 125C LTC7813HUH PBF LTC7813HUH TRPBF 7813 32-Lead (5mm 5mm) Plastic QFN 40C to 150C LTC7813MPUH PBF LTC7813MPUH TRPBF 7813 32-Lead (5mm 5mm) Plastic QFN 55C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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