LT3477

PRODUCTION

3A, DC/DC Converter with Dual Rail-to-Rail Current Sense

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Overview

  • Dual 100mV Rail-to-Rail Current Sense Amplifiers
  • Wide Input Voltage Range: 2.5V to 25V
  • 3A, 42V Internal Switch
  • High Efficiency Power Conversion: Up to 93%
  • Drives LEDs in Boost, Buck-Boost or Buck Mode
  • Frequency Set by External Resistor: 200kHz to 3.5MHz
  • Programmable Soft-Start
  • Low VCESAT Switch: 0.3V at 2.5A
  • Capable of Positive and Negative Output Voltages (Boost, Inverting, SEPIC, Flyback)
  • Available in Thermally Enhanced 20-Lead (4mm × 4mm) QFN and 20-Lead TSSOP Packages

The LT3477 is a current mode, 3A DC/DC step-up converter with dual rail-to-rail current sense amplifiers and an internal 3A, 42V switch. It combines a traditional voltage feedback loop and two unique current feedback loops to operate as a constant-current, constant-voltage source. Both current sense voltages are set at 100mV and can be adjusted independently using the IADJ1 and IADJ2 pins. Efficiency of up to 93% can be achieved in typical applications. The LT3477 features a programmable soft-start function to limit inductor current during start-up. Both inputs of the error amplifier are available externally allowing positive and negative output voltages (boost, inverting, SEPIC, Flyback). The switching frequency is programmable from 200kHz to 3.5MHz through an external resistor.

Available in thermally enhanced 20-pin (4mm × 4mm) QFN and 20-pin TSSOP packages, the LT3477 provides a complete solution for both constant-voltage and constantcurrent applications.

Applications

  • High Power LED Driver
  • DSL Modems
  • Distributed Power
  • Input/Output Current Limited Boost, SEPIC, Inverting, Flyback Converters
  • Constant-Voltage, Constant-Current Source

LT3477
3A, DC/DC Converter with Dual Rail-to-Rail Current Sense
330mA LED Driver With Open LED Protection Efficiency Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Design Note 1

Technical Articles 2

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

Parts Product Life Cycle Description
Circuit Monitors 1
LT2940
PRODUCTION Power and Current Monitor
Pulse-Width Modulation (PWM) & Pulse Generators 1
LTC6992
TimerBlox: Voltage-Controlled Pulse Width Modulator (PWM)
Temperature Sensors 1
LTC2995
PRODUCTION Temperature Sensor and Dual Voltage Monitor with Alert Outputs
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3477
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
DC1130A

LT3477EFE/LT3003EMSE

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Product Details

DC1130A: Demo Board for the LT3477 3A, DC/DC Converter with Dual Rail-to-Rail Current Sense.

eval board
schematic 2
schematic 3
schematic 4
schematic 5
schematic 6
DC841A

LT3477EFE | Constant Current Boost LED Driver, 2.7V ≤ VIN ≤ 16V, VLED up to 36V @ 330mA

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Product Details

Demonstration circuit 841 is a constant current LED boost converter with input current and output voltage protection featuring the LT3477. The board is optimized to drive 330mA LED arrays with a total LED voltage between the maximum input voltage and 36V. The input voltage range is 2.7V to 16V.


DC841 has overvoltage protection below 36V if the LEDs are open or not properly attached to the terminals on the PCB
DC1130A
LT3477EFE/LT3003EMSE
DC1130A - Schematic
DC841A
LT3477EFE | Constant Current Boost LED Driver, 2.7V ≤ VIN ≤ 16V, VLED up to 36V @ 330mA
DC841A Demo Board DC841A Demo Board DC841A Demo Board DC841A Demo Board DC841A - Schematic

Latest Discussions

1 Years Ago
High current cunsumption
4 Years Ago
Lt3477 failed to simulate according to the official specification. Where is the error?
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