LTC3850

PRODUCTION

Dual, 2-Phase Synchronous Step-Down Switching Controller

Data Sheet (Rev. D) Product Selection Table
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Overview

  • Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • High Efficiency: Up to 95%
  • RSENSE or DCR Current Sensing
  • ±1% 0.8V Output Voltage Accuracy
  • Phase-Lockable Fixed Frequency 250kHz to 780kHz
  • Supports Pre-Biased Output
  • Dual N-Channel MOSFET Synchronous Drive
  • Wide VIN Range: 4V to 24V (30V for LTC3850I) Operation
  • Adjustable Soft-Start Current Ramping or Tracking
  • Foldback Output Current Limiting
  • Power Good Output Voltage Monitor
  • 28-Pin 4mm × 4mm, 4mm × 5mm QFN and Narrow SSOP Packages
  • AEC-Q100 Qualified for Automotive Applications
LTC3850
Dual, 2-Phase Synchronous Step-Down Switching Controller
High Efficiency Dual 3.3V/2.5V Step-Down Converter Efficiency Product Package 1 Product Package 2 Product Package 3
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Documentation

Data Sheet 1

User Guide 4

Technical Articles 3

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Hot Swap Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
Oscillators 1
LTC6909
PRODUCTION 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3850
  • LTC3850-1
  • LTC3850-2

LTpowerCAD 2

Design tools for the following parts are available in LTpowerCAD:

  • LTC3850
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
DC1126A

LTC3850EUF Demo Board | 6.5V ≤ VIN ≤ 14V, VOUT = 3.3V @ 5A & 2.5V @ 5A

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Product Details

Demonstration circuit 1126 is a high density dual output (3.3V/5A and 2.5V/5A) step down converter featuring the LTC3850EUF. The input voltage range is 6.5V to 14V. For applications that have a 5V +/- 0.5V input, the board has an optional resistor to tie the INTVCC pin to the VIN pin.


An optional DCR sense circuit allows the converter to use the inductor’s DCR as the sense element instead of the on-board sense resistors to save cost and board space and to improve efficiency.


 


eval board
schematic 2
DC1231A-A

LTC3850EGN Demo Board | 6.5V < VIN < 24V, VOUT1 = 3.3V/5A, VOUT2 = 2.5V/5A

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Product Details

Demonstration circuit 1231A is a Dual Output, Dual Phase 5A Synchronous Buck Converter featuring the LTC3850EGN. The entire circuit, including the bulk output capacitors, fit within a 1.04” × 0.94” area on all layers. The package style for the LTC3850EGN is a 28-lead narrow plastic SSOP. The main features of the board include rail tracking, an internal 5V linear regulator for bias, RUN pins for each output and a PGOOD signal 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. Two versions of the board are available. DC-1231A-A has an on-board sense resistor for current feedback, while the DC1231A-B is configured with a DCR sense circuit that allows the converter to use the inductor’s DCR as the sense element instead of the on-board sense resistors to save cost and board space and improves efficiency.


 


eval board
schematic 3
DC1231A-B

LTC3850EGN Demo Board | 6.5V < VIN < 24V, VOUT1 = 3.3V/5A, VOUT2 = 2.5V/5A, with DCR Current Sense

Buy Now View Details

Product Details

Demonstration circuit 1231A is a Dual Output, Dual Phase 5A Synchronous Buck Converter featuring the LTC3850EGN. The entire circuit, including the bulk output capacitors, fit within a 1.04” × 0.94” area on all layers. The package style for the LTC3850EGN is a 28-lead narrow plastic SSOP. The main features of the board include rail tracking, an internal 5V linear regulator for bias, RUN pins for each output and a PGOOD signal 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. Two versions of the board are available. DC-1231A-A has an on-board sense resistor for current feedback, while the DC1231A-B is configured with a DCR sense circuit that allows the converter to use the inductor’s DCR as the sense element instead of the on-board sense resistors to save cost and board space and improves efficiency.


 


eval board
schematic 4
DC1185B-A

LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 2V @ 10A, VOUT2: 1.8V @ 10A

Buy Now View Details

Product Details

Demonstration circuit 1185 is a dual phase/dual output synchronous buck converter featuring the LTC3850EUF. The demo board comes in two versions. The output voltages for version -A are 2.0V/10A and 1.8V/10A and the output voltages for version -B are 1.5V/15A and 1.2V/15A. The input voltage range is 6.5V to 14V for both versions. For applications that have a 5V ±0.5V input, the board has an optional resistor to tie the INTVCC pin to the VIN pin.

eval board
schematic 5
DC1185B-B

LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 1.5V @ 15A, VOUT2: 1.2V @ 15A

Buy Now View Details

Product Details

Demonstration circuit 1185 is a dual phase/dual output synchronous buck converter featuring the LTC3850EUF. The demo board comes in two versions. The output voltages for version -A are 2.0V/10A and 1.8V/10A and the output voltages for version -B are 1.5V/15A and 1.2V/15A. The input voltage range is 6.5V to 14V for both versions. For applications that have a 5V ± 0.5V input, the board has an optional resistor to tie the INTVCC pin to the VIN pin.

eval board
schematic 6
DC1185A-A

LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 2V @ 10A, VOUT2: 1.8V @ 10A

Buy Now View Details

Product Details

Demonstration circuit 1185 is a dual phase/dual output synchronous buck converter featuring the LTC3850EUF. The demo board comes in two versions. The output voltages for version -A are 2.0V/10A and 1.8V/10A and the output voltages for version -B are 1.5V/15A and 1.2V/15A. The input voltage range is 6.5V to 14V for both versions. For applications that have a 5V ±0.5V input, the board has an optional resistor to tie the INTVCC pin to the VIN pin.
DC1126A
LTC3850EUF Demo Board | 6.5V ≤ VIN ≤ 14V, VOUT = 3.3V @ 5A & 2.5V @ 5A
DC1126A - Schematic
DC1231A-A
LTC3850EGN Demo Board | 6.5V < VIN < 24V, VOUT1 = 3.3V/5A, VOUT2 = 2.5V/5A
DC1231A-A - Schematic
DC1231A-B
LTC3850EGN Demo Board | 6.5V < VIN < 24V, VOUT1 = 3.3V/5A, VOUT2 = 2.5V/5A, with DCR Current Sense
DC1231A-A - Schematic
DC1185B-A
LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 2V @ 10A, VOUT2: 1.8V @ 10A
DC1185B-A - Schematic
DC1185B-B
LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 1.5V @ 15A, VOUT2: 1.2V @ 15A
DC1185B-A - Schematic
DC1185A-A
LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 2V @ 10A, VOUT2: 1.8V @ 10A
DC1185A-A - Schematic

Reference Designs

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 IV GX FPGA Development Kit
DK-DEV-4CGX150N FPGA Development Kit
DK-DEV-4CGX150N Block Diagram
DK-DEV-4CGX150N Power Tree

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