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LT3477 - 3A, DC/DC Converter with Dual Rail-to-Rail Current Sense

Features

  • 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

Typical Application

LT3477 Typical Application
LT3477 Typical Application

Description

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 91% 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 constant- current applications.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

QFN-20, TSSOP-20

LT3477 Package Drawing
LT3477 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3477EFE TSSOP 20 E $4.71 $3.30 View
LT3477EFE#PBF TSSOP 20 E $4.71 $3.30 View
LT3477EFE#TR TSSOP 20 E $3.42 View
LT3477EFE#TRPBF TSSOP 20 E $3.42 View
LT3477EUF QFN 20 E $4.50 $3.15 View
LT3477EUF#PBF QFN 20 E $4.50 $3.15 View
LT3477EUF#TR QFN 20 E $3.25 View
LT3477EUF#TRPBF QFN 20 E $3.25 View
LT3477IFE TSSOP 20 I $5.66 $3.96 View
LT3477IFE#PBF TSSOP 20 I $5.66 $3.96 View
LT3477IFE#TR TSSOP 20 I $4.02 View
LT3477IFE#TRPBF TSSOP 20 I $4.02 View
LT3477IUF QFN 20 I $5.40 $3.78 View
LT3477IUF#PBF QFN 20 I $5.40 $3.78 View
LT3477IUF#TR QFN 20 I $3.84 View
LT3477IUF#TRPBF QFN 20 I $3.84 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1130A LT3477EFE/LT3003EMSE Contact Factory
DC841A LT3477EFE | Constant Current Boost w/ Vin=2.7V-16V Vout= LED + 330mA 36V Max $100.00
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Click here to view our complete list of demo boards

Applications

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

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LT3477

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