TPS54356PWP

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TPS54356PWP is a synchronous buck voltage regulator that belongs to Texas Instruments’ DC DC Switching Regulators, part of its wide portfolio of Power Management Integrated Circuits (PMIC). The TPS54356PWP is designed to provide a regulated voltage output that is independent of line and load changes, as well as keep the output voltage within a tight tolerance window. This robust device offers transient response that is superior to typical MOSFET devices, allowing for decreased output overshoot, improved load regulation, and tighter voltage regulation.

The TPS54356PWP is designed to have a wide range of applications, such as LCD TVs, motor drives, and mini-components, in which a slow turn-on is not an issue. The device is rated for an output current up to 3A and output voltage of 1V to 6V, and has a wide operating temperature range of -40 to 125C. It also includes an integrated Power-Good (PG) monitor with a single feedback pin, allowing the user to minimize the number of external components. Additionally, it offers components to meet lead-free requirements and other protection features such as hiccup/PDSL current limit, thermal shutdown and over-voltage/under-voltage lockout (UVLO).

The basic working principle of the TPS54356PWP is shown in the figure below. In this circuit, an inductor is connected to the input voltage source, and stores energy during the on-time of the switch. During the off-time the stored energy is released into the output capacitor, providing a precise output voltage. Meanwhile, the control circuit turns the switch on and off at set intervals, and the duty cycle determines the output voltage.

PS54356PWP features a synchronous rectifier topology, meaning that both switches are either independently controlled N-channel MOSFETs. The high-side switch is turned on by the EN pin, while the low-side switch is turned on when the PG output is high (no current limit) and off when the PG output is low (current limit). There is also an internal control loop that adjusts the duty cycle and shuts off the device when the voltage falls outside the specified range. This loop response is an important feature as it ensures a consistent and reliable output voltage.

By adjusting the EN signal, normal or low quiescent mode can be selected. In low quiescent mode, the switch currents are reduced to 4.5mA, reducing power consumption at light loads.The soft-start pin is a handy feature that allows for a slow build of the output voltage during startup, in order to avoid overshoot. Other additional features include an internal Schottky diode to reduce the power loss, output over-temperature protection and a sink-only enable pin for external control of the IC.

In conclusion, TPS54356PWP is a powerful and reliable voltage regulator that combines usability and performance. The device can be used in a variety of applications that require precise voltage regulation and a wide operating temperature range. It features low quiescent mode capability, low losses, and a variety of safety features.

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