LTC3867 Series

Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control

Catalog

Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control

Part	Output Configuration	Output Type	Frequency - Switching [Max]	Frequency - Switching [Min]	Duty Cycle (Max) [Max]	Output Phases	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Package / Case	Function	Number of Outputs	Supplier Device Package	Topology	Control Features	Mounting Type	Operating Temperature [Min]	Operating Temperature [Max]
Analog Devices LTC3867EUF#PBF	Positive	Transistor Driver	1.2 MHz	200 kHz	98 %	1	38 V	4 V	24-WFQFN Exposed Pad	Step-Down	1	24-QFN (4x4)	Buck	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	-40 °C	125 ¯C
Analog Devices LTC3867IUF#TRPBF	Positive	Transistor Driver	1.2 MHz	200 kHz	98 %	1	38 V	4 V	24-WFQFN Exposed Pad	Step-Down	1	24-QFN (4x4)	Buck	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	-40 °C	125 ¯C
Analog Devices LTC3867IUF#PBF	Positive	Transistor Driver	1.2 MHz	200 kHz	98 %	1	38 V	4 V	24-WFQFN Exposed Pad	Step-Down	1	24-QFN (4x4)	Buck	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Surface Mount	-40 °C	125 ¯C

Catalog

Synchronous Step-Down DC/DC Controller with Differential Remote Sense and Nonlinear Control

Key Features

• VINRange: 4V to 38V

• VOUTRange: 0.6V to 14V

• Nonlinear Control Architecture Minimizes Output Transient Excursions (Optional)

• Programmable DCR Temperature Compensation

• ±0.75% 0.6V Voltage Reference

• Fixed Frequency Range of 200kHz to 1.2MHz

• PLL Frequency Synchronization

• RSENSEor DCR Current Sensing

• Differential Remote Output Voltage Sense

• Supports Smooth Start-Up into Pre-Biased Outputs

• Programmable Soft-Start or VOUTTracking

• Hiccup Mode/Soft Recovery from Output Overcurrent

• 24-Lead (4mm × 4mm) QFN Package

Description

The LTC3867 is a current mode synchronous step-down switching regulator controller that drives all N-channel power MOSFET stages. Output voltage transient excursions are minimized by use of a nonlinear control architecture to eliminate clock latency issues.The maximum current sense voltage is programmable from 30mV to 75mV, allowing the use of either a discrete sense resistor or the inductor DCR as the sensing element. Programmable DCR temperature compensation allows constant current limit regardless of inductor temperature. Programmable inductor temperature-based thermal shutdown protects the power components from thermal stress. Soft recovery from output shorts or overcurrent minimizes output overshoot.The LTC3867 features a precision 0.6V reference and can regulate output voltages up to 14V from a wide 4V to 38V input supply range. The LTC3867 includes a high speed differential remote sense amplifier. Burst Mode®operation, continuous and pulse-skipping modes are supported. The LTC3867 is available in a 24-lead (4mm × 4mm) QFN package.ApplicationsAutomotive SystemsTelecom SystemsIndustrial EquipmentDistributed DC Power Systems