LM2737MTC

Frequency - Switching:	50kHz ~ 2MHz
Base Part Number:	LM2737
Supplier Device Package:	14-TSSOP
Package / Case:	14-TSSOP (0.173", 4.40mm Width)
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Power Good, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	90%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 5.5 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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LM2737MTC Application Field and Working Principle

Introduction

The LM2737MTC is a variety of DC-DC electric switch controller made by Texas Instruments. It combines voltage regulation and switching control, allowing design engineers to choose the most suitable conversion schemes to achieve high efficiency, low noise, and high power density solutions.

Application Field

The LM2737MTC is mainly applied to AC-DC conversion for mobile phones, laptops, and tablets due to its low switching noise. It is suitable for a variety of 3V-to-36V input voltage ranges, with buck, boost, and buck-boost solutions available.The LM2737MTC is capable of providing both continuous and pulse-skipping modes, allowing high-efficiency operation, even at very light loads. The LM2737MTC also features two internal slow-start timers, which can help protect the power arrangements and allow soft start-up.It also has current and power limiters, as well as loads of protection features. The thermally enhanced package allows extended temperature range, up to 150℃.

Working Principle

The LM2737MTC is essentially a DC-DC electric switch controller. It works by controlling switch states so as to transfer power from the input to the output, and thus regulate voltage.At its heart is a steady-state current-mode control scheme based on a constant-frequency, current-mode topology. This gives cycle-by-cycle current sensing, reducing the current limit setting resolution. The current-mode control ensures fast response to line transients and compensates for changes in output load.The LM2737MTC also has a peak current-mode PLL synchronization scheme. It uses the on-board 50MHz oscillator to provide the PLL clock frequency, allowing it to properly synchronize to any external source while providing precise control with hysteretic current modulation. This reduces losses, which can lead to improved system performance and lower power dissipation.Additionally, the LM2737MTC offers users a great deal of flexibility in choosing their switching frequency. It offers both fixed and programmable switching frequencies, allowing users to choose the most efficient frequency for any given application.

Conclusion

In conclusion, the LM2737MTC is an impressive DC-DC electric switch controller from Texas Instruments. It integrates voltage regulation and switching control into one package, and provides users with the flexibility to choose their best conversion schemes for high efficiency and power density solutions. The LM2737MTC\'s low switching noise, extended temperature range, and synchronous current-mode control ensure it meets the needs of many applications, such as mobile phones, laptops, and tablets.

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