LT1268BCQ#TRPBF

Voltage - Output (Min/Fixed):	1.244V
Base Part Number:	LT1268
Supplier Device Package:	5-DDPAK
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	150kHz
Current - Output:	7.5A (Switch)
Voltage - Output (Max):	60V (Switch)
Series:	--
Voltage - Input (Max):	30V
Voltage - Input (Min):	3.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck, Boost, Flyback
Output Configuration:	Positive or Negative
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Overview

LT1268BCQ#TRPBF is an integrated circuit (IC) power management IC (PMIC) which is designed to provide precision, low noise, and high current regulator solutions. It is part of LT’s family of DC DC switching regulators and falls under the PMIC voltage regulator category. This particular IC is specifically designed with a hybrid operating mode which combines CAP-ModeTM, PFM-ModeTM, and constant frequency operation, in order to produce higher efficiency, lower output noise, and faster load and line transient response times.

Features

LT1268BCQ#TRPBF includes several features that enable it to provide power and enable solutions for a variety of applications. The features are outlined below:• Input voltage range of 2.5V to 5.5V• Wide operating temperature range from –40°C to +125°C• Low power consumption• Very low noise of 1uVrms (at 50mV/div)• Hybrid operating mode for improved efficiency, lower output noise, and faster transient response time• Switch frequency synchronization capability • Programmable output voltage• Dual PWM cycles• Efficient current limit protection

Applications

Due to its various features, LT1268BCQ#TRPBF is suitable for a wide range of applications. These applications include mobile phones, tablets, laptops, and portable gaming consoles. It is also suitable for battery management and charging applications, power over Ethernet (PoE) applications, and USB power delivery applications.

Working Principle

LT1268BCQ#TRPBF utilizes a hybrid operating mode which combines CAP-ModeTM, PFM-ModeTM, and constant frequency operation, in order to achieve high efficiency, low noise, and fast load and line transient response times. In CAP-Mode mode, the current sense amplifier senses any changes in the input voltage and adjust the output voltage as needed. In PFM-Mode, the linear regulator compares the output voltage with the input voltage and adjusts the duty cycle accordingly. In constant frequency mode, the output voltage is regulated by controlling the duty cycle of the switch.In addition, LT1268BCQ#TRPBF utilizes both dual PWM cycles as well as efficient current limit protection for increased safety and reliability. Dual PWM cycles enables the IC to have multiple operation modes in order to achieve higher efficiency, whereas the current limit protection prevents over-current scenarios from occurring.

Conclusion

LT1268BCQ#TRPBF is a precise and low noise DC DC switching regulator which is well suited for a wide range of applications, such as mobile phones, tablets, laptops, battery management, PoE applications, and USB power delivery applications. It utilizes a hybrid operating mode which combines CAP-ModeTM, PFM-ModeTM, and constant frequency operation, in order to provide higher efficiency, lower output noise, and faster transient response times. In addition, it is also equipped with dual PWM cycles and efficient current limit protection.

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