LMR12007YMKX

Series:	SIMPLE SWITCHER®
Packaging:	Tape & Reel (TR)
Part Status:	Active
Function:	Step-Down
Output Configuration:	Positive
Topology:	Buck
Output Type:	Adjustable
Number of Outputs:	1
Voltage - Input (Min):	3V
Voltage - Input (Max):	18V
Voltage - Output (Min/Fixed):	1.25V
Voltage - Output (Max):	16V
Current - Output:	750mA
Frequency - Switching:	550kHz
Synchronous Rectifier:	No
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	SOT-23-6 Thin, TSOT-23-6
Supplier Device Package:	TSOT-23-6

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Introduction to the LMR12007YMKX

The LMR12007YMKX is a high performance step-down DC/DC switching regulator integrated circuit (IC). The LMR12007YMKX belongs to the family of PMIC (Power Management ICs) Voltage Regulators and DC DC Switching Regulators. These switching regulators offer high efficiency, low noise and low output impedance. Some of the features that make the LMR12007YMKX stand out include: low current consumption, programmable input voltage, two selectable frequency bands, one or two outputs, and various package options.

Application Fields of the LMR12007YMKX

The LMR12007YMKX is widely used in various application fields, such as:

• Cellular/mobile phones
• Portable computing
• Portable audio equipment
• Personal digital assistants (PDAs)
• Battery operated equipment
• Military and aerospace
• In-car entertainment systems

Working Principle of the LMR12007YMKX

The LMR12007YMKX operates on the principle of voltage feedback. It requires an external resistor sufficient to position the transistor operating point near the required output voltage. The output voltage is regulated simply by varying the width of the output pulse using pulse width modulation (PWM) control. The voltage regulator consists of an adjustable oscillator, error amplifiers and a Pulse Width Modulation (PWM) controller. The oscillator and error amplifiers determine the switching frequency as well as the PWM duty ratio to keep the output voltage constant. The output voltage is monitored via an external divider and is compared to an internal reference voltage. If the output voltage deviates from the reference, the error amplifier turns on or off the PWM output, resulting in a change in the duty cycle, and the output voltage is then restored to the required level.

Conclusion

In conclusion, the LMR12007YMKX belongs to the family of PMIC Voltage Regulators and DC DC Switching Regulators. It offers a high efficiency, low noise and low output impedance, making it ideal for a variety of applications, such as portable computing and portable audio equipment. The working principle of the LMR12007YMKX involves getting feedback from an external resistor to control the transistor operating point, in order to keep the output voltage constant.

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