LTC2934CDC-2#TRMPBF

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PMIC - Supervisors are reducing the work-load and complexity of traditional power management solutions. Offering consolidated, multiple-function capabilities, they can be well suited for high-efficiency designs. One particular device, the LTC2934CDC-2#TRMPBF, combines a supervisor or monitor and a switching regulator in a single package. The field of application and its working principle are described in the following.

Suitable for use in demanding industrial, medical, and automotive environments, the LTC2934CDC-2#TRMPBF power system manager is a fanout supervisor and switching regulator combination. It offers an extra robust design, with a 200 mA low-dropout (LDO) linear regulator, a 3.2 MHz/1.5 MHz pulse-width modulated (PWM) regulator, and 17 supervisor functions with power-up/power-down sequencing capabilities.

The main application of the LTC2934CDC-2#TRMPBF is its use as a power supply sequencer. It effectively simplifies the task of properly powering up and down a device\'s multiple-rail power system, avoiding power-supply glitches and resetting digital systems before and after a shut down. In this way, its 3.2 MHz/1.5 MHz PWM converter is able to provide an extra-efficient source of power for advanced peripheral processors and DSPs.

The LTC2934CDC-2#TRMPBF provides two control method possibilities to regulate the power-up/power-down sequencing process, offering design flexibility and convenience for many power system projects. The first is a manual control interface – a flexible feature that allows system operators to choose the specific order of power up and power down of the system\'s rails. The second is an automated process technique implemented by setting two bits in the chip\'s register, which either activate or deactivate a specific power rail.

Additionally, the LTC2934CDC-2#TRMPBF includes 17 supervisor functions, as requested by many industrial, medical, and automotive applications. The current-limit feature prevents an overload, while the power-good output repeatedly signals when the power rails are within an acceptable range. The reset has a programmable timeout, and a window watchdog port is also available, to provide input signals and to clear or reset devices.

Now, speaking of the working principles of the LTC2934CDC-2#TRMPBF, we must first talk about the internal 130 mA linear regulator. It is designed to meet Intel’s Core2 Duo processors\' power requirements, as it is configurable using both the voltage-in feedback pin and a low-dropout/split feedback system. The linear regulator consists of a p-type metal-oxide-semiconductor (PMOS) transistor connected in current- source configuration, which is regulated by a 1.22V low-dropout (LDO) bandgapreferenced voltage regulator. The LDO operates the current source by controlling the voltage-drop Vds across it.

The second working principle of the LTC2934CDC-2#TRMPBF is its 3.2 MHz/1.5 MHz pulse-width modulated (PWM) regulator. This PWM regulator mostly serves as a power supply for advanced peripheral devices, not only because of its higher efficiency, but also due to the better line and load regulation capabilities. During normal operation, it acts as a switch and creates a constant output voltage specified by the user. In this way, the PWM regulator is able to transfer maximum current to the output. Finally, the switching frequency of the regulator is adjusted to maintain the output voltage without any voltage spikes.

All in all, thanks to its remarkable power-up/power-down sequencing capabilities and its comprehensive set of supervisor functions, the LTC2934CDC-2#TRMPBF is an ideal choice when it comes to power management solutions. Aside from its application as a power supply sequencer and a 3.2 MHz/1.5 MHz PWM regulator for efficient source of power for advanced peripheral processors and DSPs, the LTC2934CDC-2#TRMPBF also meets the demanding power supply requirements of Intel’s Core 2 Duo processors.

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