LTC3887LTC3887-1LTC3887-2 Series

Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Catalog

Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Part	Output Type	Function	Topology	Frequency - Switching [Max]	Frequency - Switching [Min]	Serial Interfaces	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Phases	Number of Outputs	Control Features	Output Configuration	Operating Temperature [Min]	Operating Temperature [Max]	Supplier Device Package	Package / Case	Mounting Type
Analog Devices LTC3887IUHE-9	Transistor Driver	Step-Down	Buck	1 MHz	250 kHz	I2C PMBus	4.5 V	24 V	2	2	Enable Frequency Control Phase Control	Positive	-40 °C	125 ¯C
Analog Devices LTC3887IUJ-1#PBF	Transistor Driver	Step-Down	Buck	1 MHz	250 kHz	I2C PMBus	4.5 V	24 V	2	2	Enable Frequency Control Phase Control	Positive	-40 °C	125 ¯C	40-QFN (6x6)	40-WFQFN Exposed Pad	Surface Mount
Analog Devices LTC3887EUJ-1	Transistor Driver	Step-Down	Buck	1 MHz	250 kHz	I2C PMBus	4.5 V	24 V	2	2	Enable Frequency Control Phase Control	Positive	-40 °C	125 ¯C	40-QFN (6x6)	40-WFQFN Exposed Pad	Surface Mount
Analog Devices LTC3887EUJ-2#TRPBF	Transistor Driver	Step-Down	Buck	1 MHz	250 kHz	I2C PMBus	4.5 V	34 V	2	2	Enable Frequency Control Phase Control	Positive	-40 °C	125 ¯C	40-QFN (6x6)	40-WFQFN Exposed Pad	Surface Mount
Analog Devices LTC3887EUJ-1#PBF	Transistor Driver	Step-Down	Buck	1 MHz	250 kHz	I2C PMBus	4.5 V	24 V	2	2	Enable Frequency Control Phase Control	Positive	-40 °C	125 ¯C	40-QFN (6x6)	40-WFQFN Exposed Pad	Surface Mount
Analog Devices LTC3887IUJ-1	Transistor Driver	Step-Down	Buck	1 MHz	250 kHz	I2C PMBus	4.5 V	24 V	2	2	Enable Frequency Control Phase Control	Positive	-40 °C	125 ¯C	40-QFN (6x6)	40-WFQFN Exposed Pad	Surface Mount

Catalog

Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Key Features

• PMBus/I2C Compliant Serial InterfaceTelemetry Read Back includes VIN, IIN, VOUT, IOUT, Temperature, Duty Cycle and FaultsProgrammable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV and Frequency Synchronization (250kHz to 1MHz)

• Telemetry Read Back includes VIN, IIN, VOUT, IOUT, Temperature, Duty Cycle and Faults

• Programmable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV and Frequency Synchronization (250kHz to 1MHz)

• ±0.5% Output Voltage Accuracy Over Temperature

• Integrated 16-Bit ADC

• VOUTRange: 0.5V to 5.5V (VOUT0, VOUT1)

• Internal EEPROM and Fault Logging with ECC

• Integrated N-Channel MOSFET Gate Drivers (LTC3887)

• Minimum On-Time 45ns

• Wide VINRange: 4.5V to 24V

• Analog Current Mode Control Loop

• Remote Differential Sense for PolyPhase®Applications

• Accurate PolyPhase Current Sharing for Up to Six Phases

• Available in a 40-Pin (6mm × 6mm) QFN Package

• AEC-Q100 Qualified for Automotive Applications

Description

The LTC3887/LTC3887-1/LTC3887-2 are dual, PolyPhase DC/DC synchronous step-down switching regulator controllers with an I2C-based PMBus compliant serial interface. The controllers use a constant frequency, current mode architecture that is supported by LTpowerPlay®a software development tool with graphical user interface (GUI).Switching frequency, channel phasing, output voltage, and device address can be programmed using external configuration resistors. Additionally, parameters can be set via the digital interface or stored in EEPROM. Voltage, current, internal/external temperature and fault status can be read back through the bus interface.The LTC3887 has integrated gate drivers. The LTC3887-1 has three-state PWM pins to drive DrMOS power stages. The LTC3887-2 has gate drivers and no LDO and supports VINup to 34V. The LTC3887 is an enhanced version of the LTC3880 with greater output voltage range and more digital features.ApplicationsHigh Current Distributed Power SystemsTelecom, Datacom and Storage SystemsIntelligent Energy Efficient Power Regulation