LT3645
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LT3645

36V 500mA Step-Down Regulator and 200mA LDO

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Part Details
Part Models 10
1ku List Price Starting From $2.72
Features
  • Wide Input Range:
    • Operation from 3.6V to 36V
    • Overvoltage Lockout Protects Circuit Through 55V Transients on Input
  • 500mA Output Current Switching Regulator
  • High Switching Frequency: 750kHz
  • 200mA Low Dropout Linear Regulator
    • 1.2V to 16V Input; 0.8V to 8V Output
    • 310mV Dropout Voltage VCC2 to OUT2
  • Precision Programmable Undervoltage Lockout
  • Short-Circuit Robust
  • Internal Soft-Start
  • <2μA Shutdown Current
  • Small Thermally Enhanced 16-Lead (3mm × 3mm) QFN and 12-Lead MSE Packages
Additional Details
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The LT3645 is a dual output regulator combining a 500mA buck regulator and a 200mA low dropout linear regulator (LDO). The wide input voltage range of 3.6V to 36V makes the LT3645 suitable for regulating power from a wide variety of sources, including 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and capacitors, resulting in a very small solution.

Cycle-by-cycle current limit and frequency foldback provide protection against shorted outputs. Soft-start and frequency foldback eliminate input current surge during start-up.

The linear regulator operates from the VCC2 pin at voltages down to 1.2V. It supplies 200mA of output current with a typical dropout voltage of 310mV.

Other features of the LT3645 include a <2μA shutdown, short circuit protection, soft-start and thermal shutdown. The LT3645 is available in the thermally enhanced 16-lead (3mm × 3mm) QFN package, or a 12-lead MSE package.

Applications

  • Automotive CMOS Image Sensors
  • Industrial/Automotive Micro-Controller Supply
Part Models 10
1ku List Price Starting From $2.72

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Feb 4, 2020

- 20_0129

Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC

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Filter by Model

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Part Models

Product Lifecycle

PCN

Feb 4, 2020

- 20_0129

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Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC

LT3645EMSE#PBF

PRODUCTION

LT3645EMSE#TRPBF

PRODUCTION

LT3645HMSE#PBF

PRODUCTION

LT3645HMSE#TRPBF

PRODUCTION

LT3645IMSE#PBF

PRODUCTION

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PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC1428A

LT3645EMSE Demo Board | VIN = 5V to 36V, VOUT1 = 3.3V @ 300mA, VOUT2= 2.5V @ 200mA

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DC1428A

LT3645EMSE Demo Board | VIN = 5V to 36V, VOUT1 = 3.3V @ 300mA, VOUT2= 2.5V @ 200mA

LT3645EMSE Demo Board | VIN = 5V to 36V, VOUT1 = 3.3V @ 300mA, VOUT2= 2.5V @ 200mA

Product Detail

Demonstration circuit 1428A features the dual output LT3645 step-down regulator plus linear regulator. The circuit is designed to convert a 5V to 36V (55V transients) input source to 3.3V at 500mA using the buck regulator and this output is linear regulated down to provide 2.5V at 200mA. Thus the two outputs provide 300mA (buck) and 200mA (LDO).

Tools & Simulations

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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