LTC1921CMS8#TRPBF

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The LTC1921CMS8#TRPBF is a low-voltage, monolithic control and monitoring IC designed to integrate power supply regulation and supervision functionalities. It is made by Linear Technology and consists of one internally compensated voltage regulator, set of power Supply monitoring Functions and associated circuitry.

Application Field

The integrated device belongs to the power supply controllers and monitors family, more specifically to PMIC (Power Management Integrated Circuits) whose main application field is to supply voltage and current and also to monitor power supply rails, within the same device. It finds potential application in portable types of electronics, such as mobile and/or tablet computers and smartphones which use AC/DC adapters for their power sources. They also can be used to achieve general purpose power supply performance or for board net supply.

Device Working Principle

The entirety of the device works with a single 2V to 5.5V voltage power supply, while its internal voltage regulator provides up to 1.5A output current. Commonly, the switching frequency is adjustable and can be set to a maximum of 350kHz. For particular and special cases, external frequency adjustment is supported. The device also has a set of power supply monitoring functions, such as current limitation and various protection functions such as overvoltage protection and undervoltage protection.

Current Regulation

The LTC1921CMS8#TRPBF has two operational modes: constant voltage and constant current mode. In both cases, current is regulated by means of two resistors, R1 and R2. In constant voltage mode, the current is basically regulated by the voltage divided by R2. In constant current mode, the current is basically regulated by the voltage divided by R1. The regulation is done by adjustments of the PWM signal between ON and OFF periods. During ON periods, the PWM signal is ON and the output current is proportional to the ON period and decreases as the PWM signal turns OFF.

Protection Features

The device also contains some built-in protections features. In addition to current limitation, it also contains a ±6V over-voltage protection and ±0.5V under-voltage protection. The device can be programmed to react upon different OVP and/or UVP conditions, using the configuration pins set. An external fault has to be supplied in order to reset the device. This fault will be latched only until it is disabled from the external reset.

Other Features

Other features of the device include a wide range of voltage input (2V to 5.5V), low quiescent current draw of only 2µA, good thermal efficiency, built-in over-temperature protection, and low external component count.

Conclusion

This versatile and easy-to-use LTC1921CMS8#TRPBF is part of the family of PMIC and is a great device as it integrates power supply regulation and supervision functionalities into a single component. The device is suitable for a wide variety of applications and has many features that make it a great choice for evaluating and designing power supply solutions.

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