LTC3852

RECOMMENDED FOR NEW DESIGNS

Low Input Voltage, Synchronous Step-Down DC/DC Controller

Data Sheet Product Selection Table
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Overview

  • Charge Pump Input Range: 2.7V to 5.5V
  • Controller Input Range: 4V to 38V
  • Integrated Charge Pump Provides 5V Gate Drive to Logic Level MOSFETs
  • RSENSE or DCR Current Sensing
  • ±1.25% Output Voltage Accuracy Over Temperature
  • Phase-Lockable Fixed Frequency: 250kHz to 750kHz
  • Power Good Output Voltage Monitor
  • Adjustable Soft-Start Voltage Ramping
  • Current Foldback Disabled During Start-Up
  • No Reverse Current During Soft-Start
  • Selectable Constant Frequency, Pulse-Skipping, or Burst Mode Operation
  • Output Overvoltage Protection
  • Very Low Dropout Operation: 99% Duty Cycle
  • Available in a 24-Lead (3mm × 5mm) QFN Package

The LTC3852 is a constant frequency, current mode step-down DC/DC controller which can be powered by an on-board charge pump. Input supplies as low as 2.7V, when doubled by the charge pump, provide 5V to the LTC3852’s control logic and gate drives, supporting a wide selection of logic-level N-channel power MOSFETs.

The constant-frequency current mode architecture allows for a phase-lockable fixed frequency of up to 750kHz. The RUN pin provides a precision enable threshold while the TRACK/SS pin combines tracking and adjustable soft-start features.

The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping mode, and continuous current mode. Current foldback limits MOSFET power dissipation during short-circuit conditions. Reverse current and current foldback functions are disabled during soft-start. A power good output pin indicates when the output is within ±10% of its designed set point.

Applications

  • General Purpose 3.3V Systems
  • Lithium-Ion Powered Devices
  • Distributed DC Power Systems
LTC3852
Low Input Voltage, Synchronous Step-Down DC/DC Controller
High Efficiency Synchronous Step-Down Converter Efficiency and Power Loss vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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

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Software Resources

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Hardware Ecosystem

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3852

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LTC3852
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
DC1270A

LTC3852EUDD Demo Board | 2.7V ≤ VIN ≤ 5.5V, VOUT = 1.5V @ 15A

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Product Details

Demonstration circuit 1270A is a low input voltage, high efficiency synchronous buck DC/DC controller that features the LTC3852EUDD. With a 2.7V to 5.5V input range. It can supply 15A maximum load current at 1.5V output. The integrated charge pump provides 5V to the LTC3852’s control logic and gate drives, supporting a wide selection of logic-level N-channel power MOSFETs with high efficiency.


 
DC1270A
LTC3852EUDD Demo Board | 2.7V ≤ VIN ≤ 5.5V, VOUT = 1.5V @ 15A
DC1270A - Schematic

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