The LT3645IMSE 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 LT3645IMSE 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 LT3645IMSE include a <2μA shutdown, short circuit protection, soft-start and thermal shutdown. The LT3645IMSE is available in the thermally enhanced 16-lead (3mm × 3mm) QFN package, or a 12-lead MSE package.
Feature
- 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
Applications
- Automotive CMOS Image Sensors
- Industrial/Automotive Micro-Controller Supply
(Picture: Pinout)
