LTC3853

PRODUCTION

Triple Output, Multiphase Synchronous Step-Down Controller

Data Sheet Product Selection Table
Part Models
8
1ku List Price
Starting From $4.23
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Part Details

  • Triple, 120° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • Configurable as a 180° Dual Phase Controller Plus a Single Phase Controller
  • The Third Phase Can Regulate Up to a 13.5V Output
  • High Efficiency: Up to 92%
  • RSENSE or DCR Current Sensing
  • ±0.75% 0.8V Output Voltage Accuracy
  • Phase-Lockable Fixed Frequency 250kHz to 750kHz
  • Supports Pre-Biased Outputs
  • Dual N-Channel MOSFET Synchronous Drive
  • Wide VIN Range: 4.5V to 24V Operation (28V Abs Max)
  • Adjustable Soft-Start Current Ramping or Tracking
  • Foldback Output Current Limiting
  • Output Overvoltage Protection
  • Dual Power Good Output Voltage Monitors
  • 40-Lead 6mm × 6mm QFN Package
LTC3853
Triple Output, Multiphase Synchronous Step-Down Controller
High Efficiency Triple 5V/3.3V/1.2V Step-Down Converter Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Technical Articles 1

Data Sheet

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

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Hardware Ecosystem

Parts Product Life Cycle Description
Digital Power System Managers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Silicon Oscillators 1
LTC6909
PRODUCTION 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LTC3853
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.

Evaluation Kits

eval board
schematic 1
DC1254A

LT3853EUJ Demo Board | Triple, PolyPhase, 6.5V ≤ VIN ≤ 24V, VOUT1 = 2.5V/5A, VOUT2 = 1.8V/5A, VOUT3 = 3.3V/5A

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Product Details

Demonstration circuit 1254A is a polyphase 3-output step-down supply with tracking featuring the LTC3853EUJ. The input voltage range is 6.5V to 24V. For applications with narrow, 5V ±0.5V input range, the board has an optional resistor to tie the INTVCC pin to the VIN pin. The demo board provides three 5A outputs, with output voltages of 2.5V, 1.8V and 3.3V.

The main features of the board include rail tracking, an internal 5V linear regulator for bias, RUN pins for each output, two PGOOD signals and a Mode selector that allow the converter to run in CCM, pulse skip or Burst Mode operation. Synchronization to an external clock is also possible through some minor component changes.

eval board
schematic 2
DC1349A

LTC3853EUJ Demo Board | Triple, PolyPhase, 6.5V ≤ VIN ≤ 14V, VOUT1 = 1.8V/15A, VOUT2 = 1.2V/15A, VOUT3 = 2.5V/15A

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Product Details

Demonstration circuit 1349A is a polyphase 3-output step-down supply with tracking featuring the LTC3853EUJ. The input voltage range is 6.5V to 14V. For applications with narrow, 5V ±0.5V input range, the board has an optional resistor to tie the INTVCC pin to the VIN pin. The demo board provides three 15A outputs, with output voltages of 1.8V, 1.2V and 2.5V.


The main features of the board include rail tracking, an internal 5V linear regulator for bias, RUN pins for each output, two PGOOD signals and a Mode selector that allow the converter to run in CCM, pulse skip or Burst Mode operation. Synchronization to an external clock is also possible through some minor component changes.


 
DC1254A
LT3853EUJ Demo Board | Triple, PolyPhase, 6.5V ≤ VIN ≤ 24V, VOUT1 = 2.5V/5A, VOUT2 = 1.8V/5A, VOUT3 = 3.3V/5A
DC1254A - Schematic
DC1349A
LTC3853EUJ Demo Board | Triple, PolyPhase, 6.5V ≤ VIN ≤ 14V, VOUT1 = 1.8V/15A, VOUT2 = 1.2V/15A, VOUT3 = 2.5V/15A
DC1349A - Schematic

Reference Designs

DK-DEV-3CLS200N Dev Kit
DK-DEV-3CLS200N Dev Kit
LTC Parts List
DK-DEV-3CLS200N Block Diagram
Cyclone III LS FPGA Development Kit
Altera Cyclone III LS FPGA Development Kit Circuits from the lab

View Detailed Reference Design

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
DK-DEV-4CGX150N FPGA Development Kit
DK-DEV-4CGX150N FPGA Development Kit
DK-DEV-4CGX150N Block Diagram
DK-DEV-4CGX150N Power Tree
Altera Cyclone IV GX FPGA Development Kit Circuits from the lab

View Detailed Reference Design

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
Altera Cyclone III LS FPGA Development Kit
DK-DEV-3CLS200N Dev Kit
LTC Parts List
DK-DEV-3CLS200N Block Diagram
Cyclone III LS FPGA Development Kit
Altera Cyclone IV GX FPGA Development Kit
DK-DEV-4CGX150N FPGA Development Kit
DK-DEV-4CGX150N Block Diagram
DK-DEV-4CGX150N Power Tree

Latest Discussions

4 Years Ago
RE: LTC3853 for a single 3-phase output
5 Years Ago
RE: LTC3853 Tantalum vs Ceramic
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