LTC3122EDE#TRPBF

Voltage - Output (Min/Fixed):	2.2V
Base Part Number:	LTC3122
Supplier Device Package:	12-DFN (4x3)
Package / Case:	12-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	1MHz
Current - Output:	2.5A (Switch)
Voltage - Output (Max):	15V
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	1.8V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LTC3122EDE#TRPBF is a complete power management solution designed to safeguard and simplify DC/DC switching power supply. It integrates numerous regulating circuits and protection functions in a tiny and narrow 4mm*4mm QFN package. The application field comprises automotive, industrial, audio and communication, and computer systems. The LTC3122EDE#TRPBF operates up to 91% efficiency. This high efficiency allows for a smaller amount of heat dissipated and a smaller overall size compared to other competing solutions.

Functional Diagram

The LTC3122EDE#TRPBF function block diagram begins with the power-good (PG) comparator which provides a signal to determine the status of the voltage regulator system. This signal is used to determine whether the voltage regulator is working correctly or not. The power-good signal can be used to drive the shutdown output to turn-off the circuit when the regulator is in a non-operating state. The VIN input is used to receive the voltage from the mains supply and passes it through the built-in MOSFET with very low on-resistance in remote high-side float configuration. The voltage is then regulated by the integrated Boost Regulator, which features pulse-width modulation (PWM) control, temperature compensation, and fast transient response. The output of the boost regulator is then given to the output stage and output voltage is regulated to a level determined by the external resistor divider.

Safety Protection Features

The LTC3122EDE#TRPBF is equipped with a comprehensive set of protection features including over-current protection, over-temperature protection, and input current limiting.To prevent damage due to excessive current, over-current protection is provided by an internal current sensing circuit. This sensing circuit is designed to detect any excessive current entering the system and pull the MOSFET gate low, thus preventing further current flow through the circuit. The temperature of the device is also monitored to prevent potential damage due to excessive temperature. This feature is provided by an internal temperature sensing circuit which monitors the die temperature of the chip and trips an internal temperature trigger to shut-off the circuit when the temperature exceeds a pre-set level. Input current limiting is also provided which limits the input current to the desired level and prevents any excessive current entering the regulator.

Features

The LTC3122EDE#TRPBF offers the following features:

• Wide operating temperature range from −40°C to +125°C
• Wide input voltage range from 4.5V to 40V
• 1A switch current
• Up to 91% efficiency
• Integrated remote float high-side MOSFET
• Integrated over-current protection
• Integrated over-temperature shutdown
• Integrated input current limiting

Applications

The LTC3122EDE#TRPBF is ideally suited for DC/DC switching power supplies. The applications include automotive, industrial, audio and communication, and computer systems.

Conclusion

The LTC3122EDE#TRPBF is a complete DC/DC switching power supply power management solution in a tiny and narrow 4mm*4mm QFN package. It integrates numerous regulating circuits and protection functions and offers wide operating temperature range, wide input voltage range and up to 91% efficiency. It is suitable for a variety of applications including automotive, industrial, audio and communication, and computer systems.

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