L4979MD

Current - Output:	150mA
Base Part Number:	L4979
Supplier Device Package:	20-SO
Package / Case:	20-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 150°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	Enable, Reset, Watchdog
PSRR:	55dB (100Hz)
Current - Supply (Max):	3mA
Current - Quiescent (Iq):	20µA
Series:	--
Voltage Dropout (Max):	0.4V @ 150mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	5V
Voltage - Input (Max):	31V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tube

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L4979MD is a monolithic step-down DC-DC converter with integrated low-side MOSFET. This voltage regulator is a monolithic, buck-type step-down DC-DC converter that integrates the low-side power MOSFET into its package, and can be used to convert a given input voltage of 6.5 V to 5 V /2 A up to 24 V. This device utilizes a current-mode control system to achieve fast transient response, accurate line and load regulation, as well as improved system efficiency.ApplicationThe very wide range of applications of the L4979MD is what makes it desirable as a voltage regulator. It is suitable for a wide range of applications, such as portable computing, embedded systems, automotive, communication, battery-powered systems and more.In any system, it is necessary to ensure that the voltages are accurately regulated in order to maintain proper system operation. The L4979MD incorporates an on-chip voltage reference and control circuit to ensure that the output voltage is highly accurate and regulated. It also provides protection against short-circuits, overtemperature, and overvoltage conditions.The L4979MD is also capable of providing a very accurate load regulation. This ensures that the output voltage remains constant regardless of the load current. It also features a fast transient response time and very accurate line regulation. This makes it a highly reliable voltage regulator for applications where output voltage is sensitive to changes in line voltage and load current.Working PrincipleThe voltage regulator uses a current-mode PWM control system to accurately regulate the output voltage. This type of control system uses the inductor current to form a closed loop system that monitors and adjusts the output voltage in response to changes in input voltage and load current.The device controls the output voltage using an on-chip voltage reference and error amplifier that senses the voltage difference between the reference voltage and the output voltage and adjusts the PWM duty cycle to compensate for the difference. The device uses an integrated low-side MOSFET to switch the output at the required duty cycle. The switching frequency of the device is adjustable from 100 kHz to 4 MHz, which allows for a wide range of output voltage regulation and load current regulation.When the voltage regulator is powered up, the output voltage is initially regulated as the voltage reference and error amplifier begin to track and measure the output voltage. Once the output voltage reaches the set point, the error amplifier and voltage reference allow for accurate and continuous output voltage tracking despite changes in line voltage or load conditions.ConclusionThe L4979MD is an ideal, low-cost and reliable solution for applications that require a step-down DC-DC converter with an integrated low-side MOSFET and a variable switching frequency of up to 4 MHz. It is highly reliable and efficient, and can accurately regulate the output voltage despite variations in line voltage or load current. It is also suited for a wide range of applications, including embedded systems, portable computing, automotive, and many more.

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