LM20143MHX/NOPB Integrated Circuits (ICs)

Voltage - Output (Min/Fixed):	0.8V
Base Part Number:	LM20143
Supplier Device Package:	16-HTSSOP
Package / Case:	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	500kHz ~ 1.5MHz
Current - Output:	3A
Voltage - Output (Max):	4.68V
Series:	PowerWise®
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	2.95V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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IntroductionLM20143MHX/NOPB is a type of DC-DC switching regulator from Texas Instrument, a leader in the design, manufacture and sale of analog and embedded processing semiconductors. The LM20143MHX/NOPB can operate as both a step-down (buck) or step-up (boost) regulator to provide a regulated output voltage from an unregulated input voltage and has features that improve system efficiency and provide circuit protection.Application FieldThe LM20143MHX/NOPB is designed for use in any application that requires a low-voltage supply, such as mobile phones, tablets, battery-powered devices, industrial and automotive applications. The LM20143MHX/NOPB can provide a wide range of output voltage, up to 19V, which makes it suitable for virtually any low-voltage application.Working PrincipleThe LM20143MHX/NOPB is a DC-DC Buck-Boost switching regulator that uses a buck-boost architecture, combining the buck and boost switching topologies. The LM20143MHX/NOPB operates as a step-up (boost) regulator when the input voltage is below the set point, and as a step-down (buck) regulator when the input voltage is above the set point. The LM20143MHX/NOPB can also be used as a constant current source or an adjustable current source. The LM20143MHX/NOPB converts input voltage to an output voltage by rapidly switching a power switch between Ground and the input. During each switching cycle, a certain amount of energy is delivered to the output, depending on the ratio of the inductor current to the minimum on-time. The LM20143MHX/NOPB also features an integrated internal soft-start circuit to reduce the inrush current on startup and provide the output voltage stabilization.FeaturesThe LM20143MHX/NOPB offers superior regulation, transient response, and can support a wide input voltage range of 3.5V to 40V. A wide range of output voltages can be achieved with the LM20143MHX/NOPB, up to 19V. The switching frequency can be adjusted using the FREQ pin, adjustable between 200 kHz and 2.2 MHz. In addition, the LM20143MHX/NOPB also offers an integrated soft-start circuit to reduce the initial inrush current when a system is powered up and minimize output voltage overshoot. The LM20143MHX/NOPB also features peak current mode control to improve the transient response and minimize overshoot.Protection FeaturesThe LM20143MHX/NOPB also features protection features such as over-voltage, under-voltage, over-current, short-circuit and thermal shutdown. The integrated over-voltage protection prevents the output voltage from exceeding the maximum allowed level. The under-voltage protection prevents the output voltage from dropping below the minimum allowed level.The over-current protection prevents excessive current from being pulled from the input supply, thus protecting against possible damage to the power stage of the converter. The short-circuit protection monitors the output current and will shut down the device in the event of a short-circuit. The LM20143MHX/NOPB also features a thermal shutdown that will protect against severe over-temperature conditions.ConclusionThe LM20143MHX/NOPB from Texas Instruments is a powerful DC-DC buck-boost switching regulator that can provide a wide range of output voltages up to 19V and adjustable switching frequency from 200 kHz to 2.2 MHz. The LM20143MHX/NOPB also features an integrated soft-start circuit, peak current mode control, over-voltage, under-voltage, over-current, short-circuit and thermal shutdown protection. It is an ideal solution for any low-voltage application that requires a reliable, efficient and cost-effective source of power.

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