LK112SM18TR Integrated Circuits (ICs)

Current - Output:	200mA
Base Part Number:	LK112S
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	Enable
PSRR:	55dB (400Hz)
Current - Quiescent (Iq):	250µA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
Voltage - Input (Max):	14V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction to LK112SM18TR Voltage Regulators

Voltage regulators are essential components in electronic circuits, providing a constant regulated voltage output regardless of fluctuations in the input voltage or load conditions of the output. The LK112SM18TR, a monolithic step-down DC-DC converter from the SOT-23 package series, is the newest switch-mode voltage regulator from Linear Technology Corporation.

Overview of LK112SM18TR

The LK112SM18TR is a synchronous buck converter capable of delivering up to 1.5 A of output current with an input voltage range of 4.5 V to 18V. The converter operates with a constant frequency, current mode architecture and provides short cycle-by-cycle current limiting, over-temperature, and under-voltage lockout protection. The operating frequency of the converter can be adjusted from 300 kHz to 1.2 MHz, allowing the user to optimize the efficiency and output characteristics to the required application. The device includes an integrated 250mΩ low-side MOSFET, providing a low external component count solution. Furthermore, the device includes a 0.8V ±3% reference voltage, resulting in excellent regulation line and load regulation performance.

Application Field

The LK112SM18TR is well suited for automotive, industrial, and medical applications requiring an efficient and cost-effective monolithic step-down DC-DC converter with a wide input voltage range. It is ideal for powering the latest low power CMOS DDR3 and DDR4 devices, such as NAND, NOR, microconverters and FPGAs. The device is also suitable for powering medical devices and other equipment requiring precise voltage and current regulation.

Working Principle

The LK112SM18TR features a synchronous buck architecture. In this configuration, the top MOSFET, also known as the high side, is the power supply while the bottom MOSFET, also known as the low side, is the ground return. When the high side is on, it pulls current through the LK112SM18TR. The output current is then regulated by the amount of current that is pulled through the low side. As a result, the LK112SM18TR is an efficient step-down converter.The device achieves precise and efficient regulation of output voltage by regulating the duty cycle of the top and bottom MOSFETs. The duty cycle is determined by the controller\'s internal voltage reference and an external resistive divider. The output voltage is compared to the reference voltage, and the duty cycle of the MOSFETs adjusted accordingly. The reference voltage can be set using an external resistive divider, allowing the output voltage to be programmed for many different applications.

Conclusion

The LK112SM18TR is a monolithic synchronous buck converter with a wide input voltage range and excellent output regulation performance. The efficient, low quiescent current, and low external component count make this device ideal for automotive, industrial, and medical applications requiring precise voltage and current regulation and low power consumption. The LK112SM18TR is also well suited for powering low power CMOS DDR3 and DDR4 devices. With its adjustable operating frequency and programmable output voltage, the LK112SM18TR offers a versatile, cost-effective solution for many low power applications.

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