LTC3888 Series

Dual Loop 8-Phase Step-Down DC/DC Controller with Digital Power System Management

Catalog

Dual Loop 8-Phase Step-Down DC/DC Controller with Digital Power System Management

Part	Output Type	Synchronous Rectifier	Supplier Device Package	Qualification	Topology	Output Phases	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Configuration	Function	Serial Interfaces	Frequency - Switching [Max]	Frequency - Switching [Min]	Clock Sync	Package / Case	Number of Outputs	Grade	Control Features	Mounting Type	Operating Temperature [Min]	Operating Temperature [Max]	Utilized IC / Part	Main Purpose	Regulator Topology	Supplied Contents	Board Type
Analog Devices LTC3888EUHG-1#TRPBF	Transistor Driver		52-QFN (5x8)	AEC-Q100	Buck	8	4.5 V	26.5 V	Positive	Step-Down	I2C PMBus	1 MHz	250 kHz		52-WFQFN Exposed Pad	2	Automotive	Current Limit Enable Frequency Control Phase Control Power Good Soft Start	Surface Mount	-40 °C	125 ¯C
Analog Devices DC2888A-B																						LTC3888 LTC7051	DC/DC Step Down	Buck	Board(s)	Fully Populated

Catalog

Dual Loop 8-Phase Step-Down DC/DC Controller with Digital Power System Management

Key Features

• PMBus/I2C Compliant Serial InterfaceMonitor Voltage, Current, Temperature and FaultsDigitally Program VOUT, Margins, UV, OV, Current Limit, Soft-Start/Stop and Sequencing

• Monitor Voltage, Current, Temperature and Faults

• Digitally Program VOUT, Margins, UV, OV, Current Limit, Soft-Start/Stop and Sequencing

• Expandable to >16 Phases

• 4.5V ≤ VIN≤ 26.5V, 0.3V ≤ VOUT≤ 3.45V

• ±0.5% Output Voltage Accuracy

• Programmable PWM Loop Compensation

• Accurate PolyPhase®Current Sharing

• Internal EEPROM with ECC and Fault Logging

• DrMOS Output Current Monitor Interface

• DrMOS Temperature/Fault Bus Interface

• DrMOS Gate Drive Supply Monitor

• Load Step Emulation

• Internal or External PWM Clock from 250kHz to 1MHz

• 52-Pin (5mm × 8mm) QFN Package

• AEC-Q100 Qualified for Automotive Applications

Description

The LTC3888/LTC3888-1/LTC3888-2is a PMBus-compliant dual loop DC/DC synchronous step-down switching regulator controller with eight expandable phases supporting a wide range of master/slave configurations. The controller 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 compensation and built-in load step emulation facilitate setting bandwidth based on input voltage and output load capacitance. PMBus commands allow read back of input voltage, output 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.APPLICATIONSHigh Current Distributed Power SystemsServers, Network and Storage Equipment