LM2853MHX-2.5

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LM2853MHX-2.5: Application Field and Working Principle

The LM2853MHX-2.5 device is a current mode step-down switching regulator, part of Texas Instruments\' series of Power Management Integrated Circuit (PMIC). This device belongs to the category of DC-to-DC Switching Regulators, the most important type of PMICs, with ISO 26262 certification.

The LM2853MHX-2.5 device is specifically designed to operate as a synchronous switching regulator, providing a constant output controlled voltage while operating at a fixed switching frequency between 250KHz and 3MHz. Its n-channel MOSFET integrated power switching stage is capable of delivering up to 2.5A of output current. The LM2853MHX-2.5 has a low external component count and a compact PCB size, which makes it particularly suitable for space-constrained applications, such as mobile phones, tablet computers and similar portable devices.

The host of innovative features of the LM2853MHX-2.5 make it a widely used device in a variety of applications, ranging from powering microcontrollers and DSPs to audio amplifiers and point-of-load applications.

Working Principle

The working principle of the LM2853MHX-2.5 is based on the concept of current-mode control. It consists of a pulse-width modulated (PWM) series regulator, a programmable current-limit circuit, a voltage feedback circuit and a Programmable Soft-Start circuit.

The series regulator compares the output voltage with an internal reference voltage and operates in either a peak current (PC) or valley current (VC) mode, depending on the CTL pin setting. The peak or valley current limit is controlled by adjusting the ITHI or ITLO settings.

The voltage feedback circuit is used to sense the output voltage and to provide the control loop with the necessary feedback. The output voltage is regulated to the programmed set-point by varying the duty cycle of the series regulator.

The Programmable Soft-Start Circuit is used to control the duty cycle of the series regulator. It consists of a two-stage (programmed) ramp up of the output voltage. The delay and slope of the Soft-Start can be programmed via the UVLO pin.

Conclusion

The LM2853MHX-2.5 from Texas Instruments is a highly integrated PMIC DC-to-DC synchronous buck regulator that is capable of delivering up to 2.5A of output current. This device is ideal for powering microcontrollers and DSPs, as well as for audio amplifier, point-of-load and similar portable applications where space-savings is a primary concern.

The LM2853MHX-2.5 uses a current-mode control loop and features a wide range of programming options, a low component count, as well as ISO 26262 certification, allowing for a speedy and reliable implementation in a wide variety of systems.

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