LTC1438IG#PBF

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:	Tube

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LTC1438IG#PBF Application Field and Working Principle

The LTC1438IG#PBF is a versatile DC/DC switching controller that is integrated with a high current, low voltage, on-board power MOSFET, making it an ideal solution for applications requiring a wide range of voltages and currents. This device features synchronous rectification and an adjustable switching frequency, making it well-suited for designers seeking superior performance in a simple to use application. This monolithic integrated circuit (IC) is specifically designed for the DC/DC buck switching regulator. This IC provides the necessary circuitry for controlling the power MOSFET of the buck converter and for setting the regulating element for current limiting. During power-up, the control circuit can be preset to regulate a desired output voltage, and during normal operation, the control circuit adjusts the switching MOSFET duty cycle to maintain the output voltage at the predetermined level.

Features of LTC1438IG#PBF

The LTC1438IG#PBF offers good efficiency, low output ripple, and accurate regulation. Additionally, it offers a wide range of input voltages (from 4.5V to 36V), allowing it to support various applications. The adjustable switching frequency of this device allows it to be tuned for best performance given the inputs and loads. The LTC1438IG#PBF features many safety features. It provides both overvoltage and undervoltage protection, current limiter, as well as protection from over-temperature and over-current to ensure reliable performance. Integrated with over-voltage protection, it shuts off when the input voltage is exceeded and resumes normal operation when the voltage has dropped to the specified range.In addition, it integrates with dual-level current limiting, current monitor, and programmable over-temperature shutdown. The dual-level current limiting limits both the maximum current through the power switch during normal operation and the peak switch current during Start-Up. The current monitor provides an output that can be used to indicate the power switch current limit. The over-temperature protection can be programmed to shut off the switch when the die temperature exceeds a programmable threshold.

Typical Applications of LTC1438IG#PBF

The LTC1438IG#PBF is a versatile device ideally suited for a wide range of applications. It is commonly used in DC/DC regulators, uninterruptible power supplies, web-enable control systems, point-of-load (POL) regulators, switched-mode power supplies, step-down converters, and other low power applications. Additionally, the LTC1438IG#PBF can be used in automotive, industrial and medical applications.

Working Principle

The LTC1438IG#PBF is a monolithic integrated circuit with a high current, low voltage power MOSFET on board. It requires only two external components (an inductor and a capacitor) to construct an efficient buck regulator. The device works on the principle of synchronous rectification and therefore is able to transfer power from the input voltage to the output voltage efficiently and accurately. When power is supplied to the LTC1438IG#PBF, it controls the MOSFET, which acts as a switch. When the MOSFET is closed, the input voltage is passed to the input capacitor and stored. When the MOSFET is open, the stored energy from the capacitor is transferred to the output capacitor through an inductor in order to provide a regulated output voltage. The device is adjustable, so the input voltage, output voltage and switching frequency can be set selectively. The duty cycle can also be adjusted depending on the desired output voltage, which has the advantage of providing lower ripple and better energy transfer efficiency.

Conclusion

The LTC1438IG#PBF offers high levels of performance and reliability, making it an ideal choice for applications requiring a wide range of voltages and currents. Its adjustable switching frequency and synchronous rectification improve energy efficiency, enhance accuracy, and reduce losses. Additionally, its protective features, such as over-voltage, under-voltage and over-temperature protection, provide stability and reliability. For all these reasons, the LTC1438IG#PBF is the ideal choice for DC/DC buck switching regulators, uninterruptible power supplies, point-of-load regulators, and other low-power applications.

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