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reference designLTC3864

Analog Devices LTC3864

60V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability

Overview

TopologyBuck Converter
Input voltage3.5-48 V
Switching frequency50-850 kHz
Output 11.8 V / 4 A
IC revisionA

Description

The LTC®3864 is a robust, high voltage step-down DC/DC controller optimized for automotive and industrial applications. It drives a P-channel power MOSFET switch allowing 100% duty cycle operation. The wide input and output voltage ranges cover a multitude of applications. This devicehas been verified with the failure mode and effects analysis (FMEA) procedure for operation during failure conditions.The LTC3864 offers excellent light load efficiency, drawing only 40µA quiescent current in a user programmable Burst Mode operation. Its peak current mode, constant frequency PWM architecture provides for good control of switching frequency and output current limit. The switchingfrequency can be programmed from 50kHz to 850kHz with an external resistor and can be synchronized to an external clock from 75kHz to 750kHz.The LTC3864 offers programmable soft-start or output tracking. Safety features include overvoltage protection, overcurrent and short-circuit protection including frequency foldback and a power good output signal.The LTC3864 is available in thermally enhanced 12-Pin MSOP and 3mm × 4mm DFN packages.

Features

  • Wide Operating VIN Range: 3.5V to 60V
  • Wide VOUT Range: 0.8V to VIN
  • Low Operating IQ = 40µA
  • Very Low Dropout Operation: 100% Duty Cycle
  • Strong High Voltage MOSFET Gate Driver
  • Constant Frequency Current Mode Architecture
  • Verified FMEA for Adjacent Pin Open/Short
  • Selectable High Efficiency Burst Mode® Operation or Pulse-Skipping Mode at Light Loads
  • Programmable Fixed Frequency: 50kHz to 850kHz
  • Phase-Lockable Frequency: 75kHz to 750kHz
  • Accurate Current Limit
  • Programmable Soft-Start or Voltage Tracking
  • Internal Soft-Start Guarantees Smooth Start-Up
  • Power Good Output Voltage Monitor
  • Low Shutdown IQ = 7µA
  • Available in Small 12-Pin Thermally Enhanced MSOP and DFN Packages

Typical applications

  • Telecom Power Supplies
  • Industrial Power Supplies
  • Distributed Power Systems
  • Automotive Power Supplies

More information

Products

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
ISAT,10%(A)
ISAT,30%(A)
IR,40K(A)
IRP,40K(A)
RDC max.(mΩ)
fres(MHz)
Size
Version
Samples
7447709100
WE-PD SMT Power Inductor, 10 µH, 10.5 A
Simu­lation
Downloads9 files

EDA models: Components ZIP

CAD files ZIP

Electric models ZIP

Download all 9 files as zip archive
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-PD SMT Power Inductor
Inductance10 µH
Saturation Current @ 10%10.5 A
Saturation Current @ 30%13 A
Rated Current7.1 A
Performance Rated Current9.5 A
DC Resistance21 mΩ
Self Resonant Frequency21 MHz
Size1210 
VersionStandard