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LTC3372 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3372 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 44 page  LTC3372 1 Rev. A For more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION 60V Low IQ Buck Controller Plus 4-Channel 8A Configurable Buck DC/DCs TheLTC®3372isahighlyflexiblemultioutputpowersupply IC. The device includes a high-performance, high voltage (HV) step-down DC/DC switching regulator controller that drives an all N-channel synchronous power FET stage from a 4.5V to 60V input. The LTC3372 also includes four low voltage (LV) synchro- nous buck regulators that can be programmed by the C1-C3 pins to share eight 1A integrated power stages in one of eight possible configurations. Each power stage is poweredfromindependentinputswhichmaybeconnected to the HV buck’s VOUT or to other 2.25V to 5.5V supplies. The CT pin programs timing parameters of the watchdog timer and LV outputs’ Power-On Reset (RST). Precision enable thresholds facilitate reliable power-up sequencing. The LTC3372 is available in a 48-pin 7mm × 7mm QFN package. LV Efficiency vs Output Current APPLICATIONS n HV Buck Controller: VIN = 4.5V to 60V, VOUT = 5V/3.3V n LV Buck Regulators: VINA-H = 2.25V to 5.5V, VOUT1-4 ≥ 0.8V n 8×1A LV Buck Integrated Power Stages, Configurable as 2, 3 or 4 Output Channels n 8 Unique Output Configurations (1A to 4A Per Channel) n Low Total No-Load Input Supply Current (IQ) n 15µA HV Controller Only (5VOUT) n 23μA HV Controller Only (3.3VOUT) n 33μA HV Controller (3.3VOUT) Plus One LV Regulator n 9μA Per Additional LV Regulator Channel n 1MHz to 3MHz Operation (HV Runs at 1/6 Frequency) n Programmable or Synchronizable to External Clock n Programmable Watchdog and Power-On Reset Delay n IC Die Temperature Monitor Output n Thermally Enhanced 48-Pin 7mm × 7mm QFN Package n Automotive and Industrial Always-On Systems n General Purpose Multi-Channel Power Supplies All registered trademarks and trademarks are the property of their respective owners. C3 C2 C1 BUCK1 BUCK2 BUCK3 BUCK4 0 0 0 2A 2A 2A 2A 0 0 1 3A 1A 2A 2A 0 1 0 3A 1A 1A 3A 0 1 1 4A 1A 1A 2A 1 0 0 3A 2A – 3A 1 0 1 4A – 2A 2A 1 1 0 4A – 1A 3A 1 1 1 4A – – 4A Low Voltage Buck Regulator Configurations VINA–H = 3.3V VOUT = 1.8V fSW = 2MHz 1A Buck 2A Buck 3A Buck 4A Buck OUTPUT CURRENT (A) 0.0001 0.001 0.01 0.1 1 4 0 10 20 30 40 50 60 70 80 90 100 3372 TA01b 150µF ×2 47µF 5m 0.1µF 2.2µH 2.2nF 100pF 0.01µF 100k 4.7µF 47µF ×2 8.06k 100k VIN WDI LTC3372 TG SW BG SENSE+ SENSE– VOUT/EXTVCC BOOST PGOOD ITH VIN 60V MAX 4.5V MIN VOUT1 1.0V 2A TRACK/SS GND PLLIN/MODE CT VINB RT WDO RUN VINA TEMP RSTB INTVCC VOUTPRG SWA SWB FB1 EN1 VOUT 3.3V/5V 3A* VOUT2 1.2V 2A VIND VINC SWC SWD FB2 EN2 VOUT VOUT VOUT4 2.5V 2A VING VINH SWH SWG FB4 EN4 VOUT3 1.8V 2A VINE VINF SWF SWE FB3 EN3 VOUT VOUT INTVCC /GND INTVCC INTVCC C1 C2 C3 3372 TA01a *FULL LOAD IS EQUIVALENT TO SPECIFIED LOAD CURRENT PLUS THE FULL LOAD INPUT CURRENT FROM VOUT1-4 |
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