LTC3815

RECOMMENDED FOR NEW DESIGNS

6A Monolithic Synchronous DC/DC Step-Down Converter with Digital Power System Management

Data Sheet (Rev. B) Product Selection Table
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Overview

  • 2.25V to 5.5V Input Voltage Range
  • ±1% Total Output Voltage Accuracy Over Temperature at VIN = 3.3V or 5V
  • Single Resistor-Programmable Output Voltage
  • PMBus Compliant Serial Interface:
    • Programmable Output Voltage Margining: Up to ±25% VOUT Range with 0.1% Resolution
    • Read back of Average and Peak Temperature, Current, and Voltage (25Hz Refresh Rate)
    • Fault Status
  • Phase-Lockable Fixed Frequency Up to 3MHz
  • Less Than 1ms Power-Up Time
  • Integrated 13-Bit ADC
  • Optional External Reference Input
  • Pin Selectable Fast-Margining of the Output Voltage
  • Power Good Flag with Pin Programmable Thresholds and Filter Delay
  • Differential Remote Output Voltage Sensing
  • Master Shutdown Mode: <1μA Supply Current
  • Clock Out for 2-Phase Operation (12A Output Current)
  • Available in a Thermally-Enhanced 38-Lead 4mm × 6mm QFN Package

The LTC3815 is a high efficiency, 6A monolithic synchronous buck regulator using a phase lockable controlled on-time, current mode architecture. The output voltage is programmable from 0.4V to 72% of VIN with a single external resistor or an external voltage reference through the reference input (REF) pin. The output voltage can be margined up or down up to ±25% with 0.1% resolution via a PMBus-compliant serial interface. The serial interface can also be used to read back fault status and both time-averaged (~4ms) and peak input/output current, input/output voltage and temperature. System configuration and monitoring is supported by the LTpowerPlay® development system.

The architecture provides extremely fast transient response and allows operation at the very low on-times required to regulate low output voltages at high switching frequencies. The operating frequency is programmable from 400kHz to 3MHz with an external resistor or for noise sensitive applications, it can be synchronized to an external clock over the same range. The operating supply voltage range is from 2.25V to 5.5V making it suitable for operation from 2.5V, 3.3V or 5V rails or Lithium-Ion batteries.

Applications

  • Intelligent Energy Efficient Power Conversion
  • ASIC/FPGA/Processor Power
  • Distributed Power Systems
  • Point of Load Power Conversion
LTC3815
6A Monolithic Synchronous DC/DC Step-Down Converter with Digital Power System Management
LTC3815 Application Circuit LTC3815 Performance Graph LTC3815 Pin Configuration
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Application Note 1

Design Note 1

Informational 1

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Software Resources

Device Drivers 1

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3815

LTpowerPlay®

LTpowerPlay® is a powerful, Windows-based development environment supporting Linear Technology's Digital Power System Management (PSM) products.

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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
DC2065A

LTC3815EUFE Demo Board | PMBus Buck, 2.25V ≤ VIN ≤ 5.5V; VOUT Range: 0.4V to 0.72VIN @ 6A

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Product Details

Demonstration circuit 2065A is a synchronous buck converter using the LTC3815EUFE, a 6A monolithic buck regulator with power system management. The LTC3815 has the PMBus compliant serial interface and features, such as programmable output voltage margining, temperature monitoring, current and voltage read back, and fault status, etc.
DC2065A
LTC3815EUFE Demo Board | PMBus Buck, 2.25V ≤ VIN ≤ 5.5V; VOUT Range: 0.4V to 0.72VIN @ 6A
DC2065A - Schematic

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