TPS3305-25DGNRG4

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PMIC, or Power Management Integrated Circuits, is a sophisticated device that helps devices run efficiently while consuming less energy. Supervisors, as a key component of PMIC, are specialized to monitor conditions, generate and detect events, and control many aspects of the operation. TPS3305-25DGNRG4, manufactured by Texas Instruments, is a 3-pin supervisor device with reset and watchdog functions.

The TPS3305-25DGNRG4 uses a very low supply current to provide active-low reset, active-high reset and watchdog output signals to control the power on/off sequence and manage the safety of the host system. It operates over a wide range of supply voltages, from 1.2V to 5.5V, enabling it to be powered from a wide range of power sources. The active-high reset and active-low reset are assertable, or can be forced high or pulled low to reset the host system. The active-high reset is open-drain while the active-low reset can sink up to 50mA.

The watchdog output is pulse-width modulated, providing an adjustable timeout range of 1.6s to 11.6s. The built-in timeout can be extended with an external RC-network, allowing to obtain longer start-up delays, and provides flexibility with system sequencing. The TPS3305-25DGNRG4 is available in both 8-lead UDFN (Ultra Small Green) and 8-lead TSSOP packages.

Essentially, the TPS3305-25DGNRG4 is designed for detecting or controlling system power in portable applications such as PDAs, cellular phones, digital cameras, external storage systems, and set-top boxes. It provides three pins for reset and watchdog functions, three spread-spectrum pins for spread-spectrum clocks, and two power-on reset pins. These features together with its low supply current, wide supply voltage range, and heat resistive package make it ideal for use in mobile and battery-powered devices.

The working principle of TPS3305-25DGNRG4 is as follows. After powering up the device, the active-low reset pin is immediately pulled low to indicate a power-on reset. The device disables the active-high reset pin until the supply voltage is stable, and its output voltage is above the VDD reset threshold. Once the supply voltage stabilizes, the device begins monitoring the watchdog input pin and starts to count the timeout time. When the watchdog pin is deasserted, the device will reset itself, preventing lockup in the system.

TPS3305-25DGNRG4 also provides three spread-spectrum pins that can be used to reduce the harmonics radiated by the clock signal. These pins provide flexibility to be used either in power-on reset or frequency tolerance control mode, allowing users to reduce EMC emissions in real applications.

In conclusion, TPS3305-25DGNRG4 is a 3-pin supervisor device with reset and watchdog functions which is well suited for portable applications and is suitable for use in low power mobile and battery-powered devices. It provides three pins for reset and watchdog functions, three spread-spectrum pins for spread-spectrum clocks, and two power-on reset pins. Its low power consumption, wide input voltage range, and heat resistive package make it ideal for embedded applications.

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