LTC3889 Series

60V Dual Output Step-Down Controller with Digital Power System Management

Catalog

60V Dual Output Step-Down Controller with Digital Power System Management

Part	Mounting Type	Voltage - Input (Max) [Max]	Function	Voltage - Input (Min) [Min]	Operating Temperature [Min]	Operating Temperature [Max]	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Type	Topology	Output Configuration	Number of Outputs	Voltage - Output (Min/Fixed)	Package / Case	Package / Case	Supplier Device Package	Voltage - Output (Max) [Max]
Analog Devices LTC3889IUKG#TRPBF	Surface Mount	60 V	Step-Down	5 V	-40 °C	125 ¯C	85 kHz	500 kHz	Programmable	Buck	Positive	2	1 V	46 Leads	52-WFQFN Exposed Pad	52-QFN (7x8)	40 V
Analog Devices LTC3889EUKG#TRPBF	Surface Mount	60 V	Step-Down	5 V	-40 °C	125 ¯C	85 kHz	500 kHz	Programmable	Buck	Positive	2	1 V	46 Leads	52-WFQFN Exposed Pad	52-QFN (7x8)	40 V
Analog Devices LTC3889IUKG#PBF	Surface Mount	60 V	Step-Down	5 V	-40 °C	125 ¯C	85 kHz	500 kHz	Programmable	Buck	Positive	2	1 V	46 Leads	52-WFQFN Exposed Pad	52-QFN (7x8)	40 V

Catalog

60V Dual Output Step-Down Controller with Digital Power System Management

Key Features

• PMBus/I2C Compliant Serial InterfaceTelemetry Read-Back Includes VIN, IIN, VOUT, IOUT, Temperature and FaultsProgrammable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV/OC, Frequency, and Control Loop Compensation

• Telemetry Read-Back Includes VIN, IIN, VOUT, IOUT, Temperature and Faults

• Programmable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV/OC, Frequency, and Control Loop Compensation

• Output Error Less Than ±0.5% Over Temperature

• Integrated 16-Bit ADC and 12-Bit DAC

• Integrated High Side Current Sense Amplifier

• Internal EEPROM with ECC and Fault Logging

• Integrated N-Channel MOSFET Gate Drivers

• Wide VINRange: 5V to 60V

• VOUT0, VOUT1Range: 1V to 40V

• Analog Current Mode Control

• Accurate PolyPhase®Current Sharing for Up to 6 Phases (85kHz to 500kHz)

• Available in a 52-Lead (7mm× 8mm) QFN Package

Description

The LTC3889 is a dual PolyPhase DC/DC synchronous step-down switching regulator controller with I2C-based PMBus compliant serial interface. This controller employs a constant-frequency, current-mode architecture, with high voltage input and output capability along with programmable loop compensation. The LTC3889 is supported by the LTpowerPlay™software development tool with graphical user interface (GUI).The EXTVCCpin supports voltages up to 14V allowing for optimized circuit efficiency and die temperature, and for the controller output to supply the chip power. Switching frequency, output voltage, and device address can be programmed both by digital interface as well as external configuration resistors. Parameters can be set via the digital interface or stored in EEPROM. Both outputs have an independent power good indicator andFAULTfunction.The LTC3889 can be configured for discontinuous (pulse-skipping) mode or continuous inductor current mode.APPLICATIONSTelecom, Datacom, and Storage SystemsIndustrial and Point of Load Applications