LTC7819 40V Low I , Triple Output, 3-Phase Q Synchronous Step-Down Controller FEATURES DESCRIPTION n Triple Buck Synchronous Controllers The LTC 7819 is a high performance triple step-down n Wide Input Voltage Range: 4.5V to 40V synchronous DC/DC switching regulator controller that n Wide Output Voltage Range: 0.8V to 99% V drives all N-channel power MOSFET stages. Constant fre- IN n Low Operating I : 14A (14V to 3.3V, Channel 1 On) quency current mode architecture allows a phase-lockable Q n Spread Spectrum Operation switching frequency of up to 3MHz. The LTC7819 oper- n R or DCR Current Sensing ates from a wide 4.5V to 40V input supply range. Power SENSE n Integrated Bootstrap Supply Charge Pump (Channel 1) loss and supply noise are minimized by operating the n PassThru/100% Duty Cycle Capability three controller output stages out-of-phase. (Channel 1), 99% Duty Cycle (Channels 2 and 3) The very low no-load quiescent current extends oper- n Programmable Fixed Frequency (100kHz to 3MHz) ating runtime in battery powered systems. OPTI-LOOP n Phase-Lockable Frequency (100kHz to 3MHz) compensation allows the transient response to be opti- n Selectable Continuous, Pulse-Skipping, or Low mized over a wide range of output capacitance and ESR Ripple, Burst Mode Operation at Light Loads values. The LTC7819 features a precision 0.8V reference n Low Shutdown I : 1.5A Q and power good output indicators. The MODE pin selects n Small 40-Lead 6mm 6mm QFN Package among Burst Mode operation, pulse-skipping mode, or n AEC-Q100 Qualified for Automotive Applications continuous inductor current mode at light loads. The LTC7819 additionally features spread spectrum oper- APPLICATIONS ation which significantly reduces the peak radiated and n Automotive and Transportation conducted noise on both the input and output supplies, n Industrial making it easier to comply with electromagnetic interfer- n Military / Avionics ence (EMI) standards. All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION V IN 4.5V TO 38V V RUN1 RUN2 RUN3 IN 100F TG1 TG2 BOOST1 BOOST2 0.1F 0.1F 0.22H 0.22H 2m 2m V OUT SW1 SW2 5V, 50A LTC7819 BG1 BG2 470F + + SENSE1 SENSE2 SENSE1 SENSE2 V FB1 V BOOST1,2,3 VPRG1 EXTV CC IN FREQ INTV INTV CC CC TG3 V FB2 BOOST3 4.7F V FB3 PLLIN/SPREAD 0.1F 0.22H 2m SW3 BG3 ITH1 TRACK/SS1 ITH2 + ITH3 SENSE3 0.1F MODE SENSE3 7819 TA01 GND Rev. 0 1 Document Feedback For more information www.analog.comLTC7819 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Input Supply Voltage (V ) ......................... 0.3V to 40V IN BOOST1, BOOST2, BOOST3 ....................... 0.3V to 46V Switch Voltage (SW1, SW2, SW3) ................ 5V to 40V RUN1, RUN2, RUN3 Voltages ..................... 0.3V to 40V 40 39 38 37 36 35 34 33 32 31 EXTV Voltage ......................................... 0.3V to 30V CC MODE 1 30 BOOST3 INTV Voltage ............................................ 0.3V to 6V CC TRACK/SS1 2 29 BG3 (BOOST1-SW1), (BOOST2-SW2), SENSE1 3 28 SW1 (BOOST3-SW3) ............................................ 0.3V to 6V + SENSE1 4 27 TG1 + SENSE1 , SENSE1 Voltages ...................... 0.3V to 40V V 5 26 BOOST1 FB1 41 + SENSE2 , SENSE2 Voltages ..................... 0.3V to 40V GND ITH1 6 25 BG1 + SENSE3 , SENSE3 Voltages ..................... 0.3V to 40V PGOOD2 7 24 V IN RUN3 8 23 EXTV TRACK/SS1, V Voltages .......................... 0.3V to 6V CC FB1 RUN2 9 22 INTV CC TRACK/SS2, V Voltages .......................... 0.3V to 6V FB2 RUN1 10 21 BG2 TRACK/SS3, V Voltages .......................... 0.3V to 6V FB3 11 12 13 14 15 16 17 18 19 20 ITH1, ITH2, ITH3 Voltages............................ 0.3V to 2V MODE, PGOOD1, PGOOD2 Voltages ............ 0.3V to 6V PGOOD3, VPRG1 Voltages ........................... 0.3V to 6V PLLIN/SPREAD, FREQ Voltages ................... 0.3V to 6V UJ PACKAGE 40-LEAD (6mm 6mm) PLASTIC QFN BG1, BG2, BG3, TG1, TG2, TG3 .......................... (Note 9) T = 150C, = 33C/W JMAX JA Operating Junction Temperature Range (Notes 2, 8) EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB LTC7819R .......................................... 40C to 150C Storage Temperature Range .................. 65C to 150C Maximum Junction Temperature (T ) ................... 150C J ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC7819RUJ PBF LTC7819RUJ TRPBF 7819 40-Lead (6mm x 6mm) Plastic QFN 40C to 150C AUTOMOTIVE PRODUCTS** LTC7819RUJ WPBF LTC7819RUJ WTRPBF 7819 40-Lead (6mm x 6mm) Plastic QFN 40C to 150C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for thesemodels. Rev. 0 2 For more information www.analog.com SENSE2 FREQ + SENSE2 SENSE3 + V SENSE3 FB2 ITH2 V FB3 TRACK/SS2 ITH3 VPRG1 TRACK/SS3 PGOOD1 PLLIN/SPREAD TG2 PGOOD3 SW2 TG3 BOOST2 SW3