TPS54356MPWPREP Integrated Circuits (ICs)

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TPS54356MPWPREP

Application Field and Working Principle

The TPS54356MPWPREP is a step-down DC-DC converter housed in a 6-lead, low-profile (0.7mm height) DFN package, its application field is wide, including any application powered by 3.1V to 16V input voltage sources while providing outputs of 0.6V to 12V.

The TPS54356MPWPREP features an internal power switch, allowing it to operate with high efficiency over a wide load current range. The output voltage is adjustable, allowing it to support a variety of applications in which output voltage has to be tailored to a specific design.

The Maximum Typical Efficiency for the TPS54356MPWPREP is up to 96%, with a Frequency of 400Khz, and a Shutdown Current of 0.7uA.

The TPS54356MPWPREP has two operating modes, Forced Pulse-Skip Mode and Forced ON-Time Mode. The operating mode is selected with the SW pin. When forced ON time mode is selected, it operates in central valley control with a fixed ON time and clock synchronous valley control. When pulse skipping is selected, the device operates in pulse skipping control with a fixed off time.

The TPS54356MPWPREP can be used in a variety of applications, such as AC/DC Power Supplies, Portable Electronic Devices, Set-Top Boxes, Automotive Electronics and other power management systems.

Features

• 6-Lead DFN package with a low profile (0.7mm)
• Wide 3.1V to 16V Input Voltage Range
• Programmable Output Voltage Range: 0.6V to 12V
• Rated Output Current up to 3.5A
• Power Switch with RDS(on) of 0.2Ω
• Maximum Typical Efficiency up to 96%
• Frequency: 400kHz
• Shutdown Current: 0.7uA
• Two Operating Modes: Forced Pulse-Skip Mode and Forced ON-Time Mode
• Programmable Soft-Start
• Programmable Frequency Synchronization
• Lead Free; RoHS Compliant

Working Principle

The TPS54356MPWPREP works on a voltage regulating process and is optimized for transfer of energy from an input supply to the power output. This process is achieved by a rectifier, which converts the input AC-DC power supply from the rectifier to a output DC voltage. The internal power switch integrated on the IC is used as the major components for transferring energy from the input source to the output. In the TPS54356MPWPREP there are two operating modes, which are Forced Pulse-Skip Mode and Forced ON-Time Mode.

In Forced Pulse-Skip mode, the IC uses Pulse-Skip control to regulate output voltage, in which the device disable pulses and always ensure the output voltage is in line with the reference voltage, making sure long time stability of operating current. The TPS54356MPWPREP precisely controls the transfer voltage by controlling the frequency of the switch converter.

In Forced ON-Time mode, the device uses central valley control with a fixed ON-time and clock synchronous valley control. Its output voltage is regulated by pulse width modulation, meaning that more pulses are conducted with higher reference voltage and lower pulses are conducted with lower reference voltage. The peak current of the switch converter is restricted to a constant.

In either mode, the voltage remains stable and the efficiency is kept high due to its low dropout current. The integrated power switch allows for withstanding high inductive current and feature in-rush current limit, overtemperature protection and integrated programmable soft-start. The TPS54356MPWPREP is able to provide a high-efficiency power regulation solution which is capable to handle a wide load range.

Conclusion

The TPS54356MPWPREP DC-DC converter provides a high efficiency power conversion solution for various applications. With a maximum typical efficiency of up to 96% and a wide operating temperature, it is able to operate a wide range of loads. For higher temperatures, there is an integrated programmable soft-start and over-temperature protection features which increases its capabilities.

Therefore, the TPS54356MPWPREP has the capability to achieve high efficiency of power conversion and can be used in a variety of applications. As it operates in two modes, users can tailor the mode according to their requirements and still receive an efficient solution.

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