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LTC4449 Datasheet(PDF) 1 Page - Analog Devices |
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LTC4449 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 48 page  LTC7871 1 Rev. 0 For more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION Six-Phase, Synchronous Bidirectional Buck or Boost Controller The LTC®7871 is a high performance bidirectional buck or boost switching regulator controller that operates in either buck or boost mode on demand. It regulates in buck mode from VHIGH-to-VLOW and boost mode from VLOW-to-VHIGH depending on a control signal, making it ideal for 48V/12V automotive dual battery systems. An accurate current pro- gramming loop regulates the maximum current that can be delivered in either direction. The LTC7871 allows both batteries to supply energy to the load simultaneously by driving energy from either battery to the other. Its proprietary constant frequency current mode archi- tecture enhances the signal-to-noise ratio enabling low noise operation and provides excellent current match- ing between phases. Additional features include an SPI- compliant serial interface, discontinuous or continuous mode of operation, OV/UV monitors, independent loop compensation for buck and boost operation, accurate inductor current monitoring and overcurrent protection. The LTC7871 is available in a 64 pin 10mm × 10mm LWE package. High Voltage Bidirectional Controller with Programming and Monitoring Functions Boost-to-Buck Transition APPLICATIONS n Unique Architecture Allows Dynamic Regulation of Input Voltage, Output Voltage or Current n Operates with External Gate Drivers and MOSFETs n VHIGH Voltages Up to 100V; VLOW Voltages Up to 60V n Synchronous Rectification: Up to 98% Efficiency n ADI-Proprietary Advanced Current Mode Control n ±1% Voltage Regulation Accuracy Overtemperature n Accurate, Programmable Inductor Current Monitoring and Bidirectional Regulation n SPI Compliant Serial Interface n Operation Status and Fault Report n Programmable VHIGH, VLOW Margining n Phase-Lockable Frequency: 60kHz to 750kHz n Optional Spread Spectrum Modulation n Multiphase/Multi-ICs Operation Up to 24 Phases n Selectable CCM/DCM/Burst Mode Operation n Thermally Enhanced 64-Lead LQFP Package n AEC-Q100 Qualification in Progress n Automotive 48V/12V Dual Battery Systems n Backup Power Systems All registered trademarks and trademarks are the property of their respective owners. 7871 TA01a DRIVER PWM1 0.1µF 1.69k 1m 16.9k 0.1µF 1.5k 6.8µH SNSA1+ SNSD1+ SNS1– VFBLOW OVLOW EXTVCC VLOW 12V/180A OVHIGH UVHIGH VFBHIGH VHIGH ITHLOW IMON SS SETCUR DRVCC V5 PWMEN FREQ SGND VHIGH DRIVER PWM6 0.1µF 1.69k 1m 16.9k 0.1µF 1.5k 6.8µH SNSA6+ SNSD6+ SNS6– VHIGH 22µF ×6 110k + 100µF ×6 VHIGH 30V TO 70V 2.2µF ×12 + 33µF ×12 90.9k 10k 10k 2.2 100pF 0.1µF 4.7µF 4.7µF 45.3k 0.33µF 1nF 499 51k 37.4k 0.1µF 47pF 499 499k 12.7k 210k 10k 3.01M 48.7k BOOST BUCK SPI INTERFACE (PHASE 2 TO PHASE 5) LTC7871 1µF PINS NOT USED IN THIS CIRCUIT: CLKOUT DRVSET MODE ILIM RUN FAULT PGOOD ITHHIGH LTC7060 LTC7060 NOTE: SDO REQUIRES PULL-UP BUCK SCLK SDI SDO CSB Boost–to–Buck Transition 50µs/DIV BUCK 5V/DIV 7871 TA01b VLOW 2V/DIV IL 5A/DIV VHIGH 2V/DIV VSW 100V/DIV |
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