Voltage - Output (Min/Fixed):	1.2V
Base Part Number:	LM2598
Supplier Device Package:	DDPAK/TO-263-7
Package / Case:	TO-263-8, D²Pak (7 Leads + Tab), TO-263CA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	150kHz
Current - Output:	1A
Voltage - Output (Max):	37V
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	40V
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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LM2598SX-ADJ Application Field and Working Principle

Introduction

The LM2598SX-ADJ is an inductor-based step-down converter part of the Texas Instruments’ DC-DC Switching Regulators family of Power Management ICs (PMICs). It is capable of providing constant output voltage from an input voltage as high as 30VDC. It features an adjustable output voltage of up to 24VDC and is capable of supplying power for up to 1.5A with a robust internal MOSFET and 5.3mOhm Rds. The LM2598SX-ADJ is designed to minimize external component count and improve efficiency through advanced switching techniques.

Applications

The LM2598SX-ADJ is a good fit for applications requiring a simple, yet efficient and cost-effective solution, particularly ones involving automotive and transportation electronics. As a PMIC, the LM2598SX-ADJ provides a reliable, low-maintenance solution for powering components like sensors, Smartphones, tablets, and other consumer electronics. It can also be used in a variety of other applications, such as factory automation and medical equipment.

Working Principle

The LM2598SX-ADJ’s working principle follows a typical buck converter architecture. It uses an integrated MOSFET to switch from VIN to VOUT. The MOSFET’s switching frequency is controlled by the LM2598SX-ADJ’s internal oscillator, which is adjustable depending on the system’s power requirements. When the LM2598SX-ADJ is powered on, the MOSFET’s gate voltage gradually rises, allowing it to pass the current through. As the MOSFET passes more current, the inductor stores energy in its magnetic field, while the output voltage slowly rises to the desired value. The LM2598SX-ADJ automatically senses the associated voltage drop, and switches the MOSFET off until the magnetic field dissipates, allowing the current to pass through for another cycle. The LM2598SX-ADJ also features safe, efficient protection features to protect the device from damage due to incorrect circuit settings. An internal thermal shutdown circuit prevents the device from getting too hot and destroys the component. Additionally, the LM2598SX-ADJ features an over-current protection circuit, which kicks in when the output current exceeds a predetermined maximum.

Conclusion

The LM2598SX-ADJ is an advanced inductor-based step-down converter, designed to provide an efficient, cost-effective solution for powering various electronic devices. Its adjustable operating frequency and built-in protection circuits make it a great choice for powering components like sensors, Smartphones, tablets, and other consumer electronics. Its robust internal MOSFET and low Rds also help to minimize external component count, while improving the device’s efficiency.

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