LTC1438IG-ADJ#TRPBF

Frequency - Switching:	Up to 400kHz
Base Part Number:	LTC1438
Supplier Device Package:	28-SSOP
Package / Case:	28-SSOP (0.209", 5.30mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Power on Reset, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	3.5 V ~ 30 V
Output Phases:	1
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LTC1438IG-ADJ#TRPBF Application Field and Working Principle

The LTC1438IG-ADJ#TRPBF is a DC-DC switching controller IC. It belongs to a group of power management integrated circuits (PMICs) called Voltage Regulators, and to a smaller group called DC-DC Switching Controllers. This device is also known as a Step-Down DC/DC Converter and is used to provide a regulated output voltage, by first converting an input voltage to a different output voltage.In general, this type of controller is used in applications such as telecom and consumer electronics, where the input voltage needs to remain constant and stabilize power demand in a power supply. This type of regulator is also widely used in consumer, automotive, and industrial applications.

Design and Features of LTC1438IG-ADJ#TRPBF

The LTC1438IG-ADJ#TRPBF switch mode controller is designed to provide an adjustable output voltage with high efficiency. The controller provides a high-accuracy adjustable output that is set with an external resistor network. Using a pulse width modulated (PWM) signal and an external logic signal, a low-ripple DC voltage can be obtained with a high step-down ratio of 1,000:1 or more. The device offers a high level of integration, with no frequency compensation or loop compensation required. With an internal overload protection and built-in soft-start and overvoltage protection features, it is an ideal solution for a wide range of applications.

Working Principle

The LTC1438IG-ADJ#TRPBF works on the principle of pulse-width modulation (PWM). It uses an internal oscillator to produce periodic pulses that are compared with a different reference signal. The difference between the two signals is used to control the width and frequency of the pulses, which in turn control the output voltage. The device is capable of operating at a high switching frequency, up to 1MHz, which allows it to produce low-ripple output voltages. The switching frequency can be adjusted via an external resistor network, allowing the user to optimize the performance of the device for the application it is being used in. In order to ensure maximum efficiency, the device also powers down to a low quiescent current when no load is present, which means it consumes less power when not in use. This quiescent current is adjustable via an external resistor network.

Conclusion

The LTC1438IG-ADJ#TRPBF is a step-down DC/DC switching controller used to provide high accuracy adjustable output voltage for a wide range of applications. It uses pulse-width modulation (PWM) to achieve a high step-down ratio of up to 1,000:1 or more. It allows for adjustable switching frequency, adjustable quiescent current, and various safety features such as overvoltage and overload protection. The device is well-suited for applications such as telecom and consumer electronics, where the input voltage needs to remain constant and stable.

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