LT3477
LT3477
PRODUCTION3A, DC/DC Converter with Dual Rail-to-Rail Current Sense
- Part Models
- 8
- 1ku List Price
- Starting From $4.84
Viewing:
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
Documentation
Data Sheet 1
User Guide 2
Design Note 1
Technical Articles 2
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3477EFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT3477EFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT3477EUF#PBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LT3477EUF#TRPBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LT3477IFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT3477IFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT3477IUF#PBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LT3477IUF#TRPBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT3477EFE#PBF | PRODUCTION | |
| LT3477EFE#TRPBF | PRODUCTION | |
| LT3477IFE#PBF | PRODUCTION | |
| LT3477IFE#TRPBF | PRODUCTION | |
|
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LT3477EUF#PBF | PRODUCTION | |
| LT3477EUF#TRPBF | PRODUCTION | |
| LT3477IUF#PBF | PRODUCTION | |
| LT3477IUF#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
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|---|---|---|
| Circuit Monitors 1 | ||
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| 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 |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3477
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.
