LTC3891

RECOMMENDED FOR NEW DESIGNS

Low IQ, 60V Synchronous Step-Down Controller

Data Sheet Product Selection Table
Part Models
16
1ku List Price
Starting From $4.15
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Part Details

  • Wide VIN Range: 4V to 60V (65V Abs Max)
  • Low Operating IQ: 50μA
  • Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
  • RSENSE or DCR Current Sensing
  • Phase-Lockable Frequency (75kHz to 750kHz)
  • Programmable Fixed Frequency (50kHz to 900kHz)
  • Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Load
  • Selectable Current Limit
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Output Voltage Soft-Start or Tracking
  • Power Good Output Voltage Monitor
  • Output Overvoltage Protection
  • Low Shutdown IQ: < 14μA
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • No Current Foldback During Start-Up
  • Small 20-Pin 3mm × 4mm QFN and TSSOP Packages
LTC3891
Low IQ, 60V Synchronous Step-Down Controller
LT3891 High Efficiency 3.3V Step-Down Converter Efficiency and Power Loss vs Output Current Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Design Note 2

Technical Articles 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

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Tools & Simulations

LTspice 5

Models for the following parts are available in LTspice:

  • LTC3891

LTpowerCAD 4

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
DC1695B

LTC3891EFE Demo Board | 4.5V ≤ VIN ≤ 60V, VOUT = 3.3V @ 5A

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Product Details

Demonstration circuit 1695 is a Low Quiescent Current, Synchronous Buck Converter featuring the LTC3891EFE. DC1695 converts a 4.5V-60V voltage source to 3.3V at 5.0A. The main features of the board include an internal LDO for power gate driver from VIN or EXTVCC, RUN and PGOOD pins and a Mode selector that allows converter to run in CCM, Pulse Skipping or Burst Mode operation, selectable current limit. DC1695 supports also adjustable output voltage, Soft-Start and Tracking. Synchronization to an external clock is possible as well. The wide input voltage range of 4.5V to 60V is suitable for automotive or other battery fed application and Distributed DC Power Systems where low quiescent current is important.


 


eval board
schematic 5
schematic 6
schematic 7
schematic 8
schematic 9
schematic 10
DC1940A

LTC3891EUDC Demo Board: 16V to 60V Input, VOUT = 12V at 15A

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Product Details

Demonstration circuit 1940A is a low quiescent current, synchronous buck converter featuring the LTC3891EUDC. This demo board converts a 16V to 60V voltage to a 12V at 15A output. The main features of this board include an internal LDO for gate drive power from VIN or EXTVCC, RUN and PGOOD pins, a mode selector that allows the converter to run in constant current mode (CCM), pulse-skipping or Burst Mode® operation, and selectable current limit. The DC1940A supports an adjustable output voltage, soft-start and tracking. The wide input voltage range of 16V to 60V is suitable for double battery automotive and distributed DC power systems where low quiescent current is important.


 
DC1695B
LTC3891EFE Demo Board | 4.5V ≤ VIN ≤ 60V, VOUT = 3.3V @ 5A
DC1695B Evaluation Board DC1695B Evaluation Board - Top View DC1695B Evaluation Board - Bottom View DC1695B - Schematic
DC1940A
LTC3891EUDC Demo Board: 16V to 60V Input, VOUT = 12V at 15A
DC1940A Demo Board DC1940A Demo Board DC1940A Demo Board DC1940A Demo Board DC1940A Demo Board DC1940A - Schematic

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