Linear Technology LT3669/LT3669-2 Step-Down Regulator and LDO Datasheet

About this manual

The LT3669 is an industrial transceiver that integrates a step-down switching regulator and a low dropout (LDO) linear regulator. It includes wake-up detect functionality and a programmable power-on reset timer. The device features externally adjustable current limits and slew rates for the line drivers to optimize EMC performance.

The LT3669 operates from an input voltage range of 7.5V to 40V and provides a maximum load current of 100mA (LT3669) or 300mA (LT3669-2). It includes rugged line drivers capable of sourcing/sinking up to 250mA each, with an adaptive pulsing scheme for safely switching heavy capacitive loads. The device is available in a small 28-pin thermally enhanced QFN package.

What's inside

• Typical Application Features
• Absolute Maximum Ratings
• Pin Configuration
• Electrical Characteristics - Power Supply
• Electrical Characteristics - Switching Regulator
• Electrical Characteristics - LDO Linear Regulator
• Line Drivers Specifications

Specifications

Frequently asked questions

What is the maximum operating input voltage?

The device operates from an input voltage range of 7.5V to 40V.

What is the maximum load current for the LT3669-2?

The LT3669-2 supports a maximum load current of 300mA.

Does the LT3669 include an LDO regulator?

Yes, it includes an integrated 150mA low dropout linear regulator.