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LTC3889 Datasheet(PDF) 1 Page - Analog Devices |
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LTC3889 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 118 page  LTC3888/LTC3888-1/ LTC3888-2 1 Rev. B For more information www.analog.com Document Feedback TheLTC®3888/LTC3888-1/LTC3888-2isaPMBus-compliant dual loop DC/DC synchronous step-down switching regu- lator controller with eight expandable phases supporting a wide range of master/slave configurations. The control- ler uses constant frequency current mode architecture to provide excellent transient response and output regulation. Each PWM master is capable of producing output voltages from 0.3V to 3.45V with multiple phase configurations using DrMOS devices that provide an output current monitor. PMBus configuration and monitoring is supported by LTpowerPlay™ software. Programmable loop compensa- tion and built-in load step emulation facilitate setting band- width based on input voltage and output load capacitance. PMBus commands allow read back of input voltage, out- put voltage and current, and operating status. Operating parameters can be set via PMBus command or stored in internal EEPROM for use at power up. Switching frequency, phase configuration, output voltage (LTC3888/LTC3888-2), output current limit (LTC3888-1) and device address can also be set using external programming resistors. TYPICAL APPLICATION FEATURES DESCRIPTION Efficiency vs Load Current (8-Phase Using LTC7051) APPLICATIONS n PMBus/I2C Compliant Serial Interface n Monitor Voltage, Current, Temperature and Faults n Digitally Program VOUT, Margins, UV, OV, Current Limit, Soft-Start/Stop and Sequencing n Expandable to >16 Phases n 4.5V ≤ VIN ≤ 26.5V, 0.3V ≤ VOUT ≤ 3.45V n ±0.5% Output Voltage Accuracy n Programmable PWM Loop Compensation n Accurate PolyPhase® Current Sharing n Internal EEPROM with ECC and Fault Logging n DrMOS Output Current Monitor Interface n DrMOS Temperature/Fault Bus Interface n DrMOS Gate Drive Supply Monitor n Load Step Emulation n Internal or External PWM Clock from 250kHz to 1MHz n 52-Pin (5mm × 8mm) QFN Package n AEC-Q100 Qualified for Automotive Applications n High Current Distributed Power Systems n Servers, Network and Storage Equipment All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents, including 7420359, 8786265, 8786268 and 8823352. Licensed under U.S. Patent 7000125 and other related patents worldwide. AVS, SPI ADJUST OF VOUT VOUT SET BY Resistor Divider PMBus CONTROL OF VOUT OPTIONAL COMPENSATION ZERO LTC3888 • • LTC3888-1 • • • LTC3888-2 • • LTC3888-1 PWM1 1µF TSNS1 FAULT0 FAULT1 GND 388812 TA01a VDD33 VIN 5V TO 24V (NOMINAL) VOUT1 0.3V TO 3.45V AT 120A VOUT0 0.3V TO 3.45V AT 120A ISENSE1 IREF VIN INTVCC NOTE: SOME DETAILS OMITTED FOR CLARITY ONLY TWO OF EIGHT CHANNELS SHOWN ITH1 1µF ITHR1 RUN0 RUN1 SHARE_CLK VSENSE1+ VSENSE1– DAOUT1 VFB1 SYNC PWM0 TSNS0 PGOOD1 VDD25 ISENSE0 ITH0 ITHR0 SCL SDA ALERT VSENSE0+ VSENSE0– DAOUT0 VFB0 PGOOD0 POWER STAGE SW GND VIN PWM IREF TEMP PSM SHARED PINS PMBus IMON POWER STAGE SW GND VIN PWM IREF TEMP IMON 100pF 2200pF 4.7µF 2.2µF 1µF 100pF 2200pF Dual Loop 8-Phase Step-Down DC/DC Controller with Digital Power System Management Dual 4-phase PSM Rails (LTC3888-1) VIN = 12V AT 500KHZ 0.6V 0.8V 1.0V 1.8V LOAD CURRENT (A) 0 80 160 240 320 400 70 75 80 85 90 95 100 388812 TA01b |
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Similar Description - LTC3889 |
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