LM2590HVT-5.0

Voltage - Output (Min/Fixed):	5V
Base Part Number:	LM2590
Supplier Device Package:	TO-220-7
Package / Case:	TO-220-7 (Formed Leads)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	150kHz
Current - Output:	1A
Voltage - Output (Max):	--
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	60V
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tube

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Introduction

The LM2590HVT-5.0 is a high efficiency, step-down DC-DC converter integrated circuit with over-current and thermal protection. It offers low-output ripple, tight regulation, and low external part count. It can be used in a wide variety of applications, including general power supply, cellular phones and notebook computers.

Application Fields

The LM2590HVT-5.0 is mainly implemented in voltage regulating applications. It can be used for step-down voltage conversion for increased power efficiency, tight regulation, and low external parts count. It can also be used for multi-channel applications, where multiple output voltages can be controlled independently.It is suitable for many power supply applications, such as cellular phones and notebook computers. It is also widely used in automotive, consumer, and industrial systems. It can be used for LED lighting, battery charging, and other applications.

Working Principle

The LM2590HVT-5.0 converts an input voltage from a wide range, such as 2.3V to 40V, and produces an output voltage that is adjustable from 1.2V to 37V. It uses the PWM (Pulse Width Modulation) technique to provide a pulse width output voltage.The device consists of an internal PWM oscillator, a DMOS (Dual Metal Oxide Semiconductor) output power switch, an ON/OFF diode, a precision voltage reference, an internal temperature sensor, and a current sense resistor.The PWM oscillator is controlled by a logic signal, which in turn is controlled by an external resistor. This control is necessary for controlling the output voltage. A selected voltage is compared with a reference voltage, which is generated from the external resistor, to generate the logic signal.The DMOS power switch is then pulsed by the logic signal, controlling the amount and duration of charge on the output capacitor. This determines the output voltage.The LM2590HVT-5.0 also features output short-circuit protection, under-voltage lockout, current limited shutdown, and thermal shutdown protection. It also features an input voltage rejection (IVR) for improved stability.

Conclusion

The LM2590HVT-5.0 is a high efficiency, step-down DC-DC converter integrated circuit with built-in protection functions. It is mainly used for voltage regulating applications and is suitable for many power supply applications, such as cellular phones and notebook computers. It works on the principle of PWM (Pulse Width Modulation) technique and has low output ripple and tight regulation with low external part count.

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