TPS54229DDA

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TPS54229DDA, a synchronous step-down detector/regulator with integrated MOSFETs, is designed to deliver up to 10 A of continuous load current in an ultra-small TSOT package. Its application field and working principle are discussed in this post.

Application Field

Leveraging advanced TinyPower™ and 0.7 mm Ultra-Low Profile packaging technologies, TPS54229DDA sets a new benchmark in power management usability, allowing DC/DC applications to deliver high peak output currents and excellent transient response for larger applications that previously would have required bulky magnetic components and large 3-phase packages. Typical applications for this device include portable battery-powered applications such as USB-PD and QuickCharge compliant PD controllers and AC/DC adapters, even when AC/DC input voltages are up to 90 VDC.

The device is also ideal for use in large current, port-powered applications such as VR Headsets, Industrial Communications systems, Routers and Modems, where features such as low shut-down current and high efficiency are critical.

Working Principle

TPS54229DDA has an integrated synchronous rectifier and a high-performance current-mode PWM controller, which reduces external component count and size and provides fast transient responses. The main feature of this device is its ability to maintain a high efficiency performance of up to 94.5% over a wide load range and input voltage. This is made possible by synchronous rectification, which eliminates power loss in the output rectifier and allows the regulator to draw current from the input supply only when necessary. The device also offers a variety of system protection features to ensure the safety and reliability of the system.

The controller of TPS54229DDA uses a pulse-width modulation (PWM) technique to regulate the output voltage in order to maintain the output current and voltage within the specified limits. The PWM switching is adjustable to match the power needs of the application. The output voltage can be adjusted by using the internal resistor divider, which has a range of 0.8 V to 2.5 V. The feedback voltage is compared to a precision reference to control the output voltage. The output voltage is regulated to within ±1.5% over line and load variations.

TPS54229DDA also features an internal low-side MOSFET. The integrated MOSFET drives the load current during its on-time and dissipates it during the off-time. To ensure the maximum efficiency, the on-time is automatically optimized according to frequency, load current, and duty cycle values. The MOSFET also has advanced thermal shutdown, thermal protection, and overcurrent limiting. These protect the device in the event of excessive current draw, overload conditions, and environmental changes.

Conclusion

TPS54229DDA is an advanced synchronous step-down detector/regulator with integrated MOSFETs, designed to deliver up to 10 A of continuous load current. The device’s application field mainly includes portable battery-powered applications, AC/DC adapters, VR Headsets, Industrial Communications systems, Routers and Modems, etc. It works based on pulse-width modulation (PWM) technique, utilizing synchronous rectification, to regulate the output voltage. The device also offers advanced system protection features for safety and reliability.

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