TPS54428DDA

Voltage - Output (Min/Fixed):	0.76V
Base Part Number:	TPS54428
Supplier Device Package:	8-SO PowerPad
Package / Case:	8-PowerSOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	650kHz
Current - Output:	4A
Voltage - Output (Max):	7V
Series:	D-CAP2™, Eco-Mode™
Voltage - Input (Max):	18V
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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TPS54428DDA is a DC-DC switching voltage regulator from Texas Instruments. It is part of the Power Management ICs (PMICs) family and more specifically of the Voltage Regulators DC DC series. This device is designed to precisely regulate output voltage and current from a given input voltage with high accuracy and high power efficiency. The TPS54428DDA can be used in many applications including distributed power systems, communications systems, consumer electronics, industrial circuits, and automotive applications.

Design and Features

The TPS544 28DDA device integrates MOSFETs and other control circuits in a single package. The device’s improved circuit topology enables very accurate voltage regulation. It has an input voltage range of 4.5 V to 15 V and an output voltage range of 0.5 V to 5.3 V. The device is available in both 4 A and 6 A packages and features a low quiescent current of 15 uA. It also has a low external part count, integrated compensation and a wide operating frequency range of 250 kHz to 2.25 MHz.
The maximum available power output of the device is dependent on the particular application. It can be calculated by considering the input and output voltages, current and temperature rise as per the application. The TPS544 28DDA offers high overload and over-temperature protection. Additionally, it has built-in soft-start for inrush current minimization and current-limit protection.

Applications

The TPS544 28DDA offers three-level performance and stability, making it ideal for distributed power systems. It is suitable for use in demanding applications such as servers, storage systems, base-stations, and wireless networks. In communications systems, the device provides reliable voltage and current regulation while also providing improved electromagnetic interference (EMI) performance. In consumer electronics applications, the device’s low power consumption and wide range of output voltages make it suitable for use in portable devices and many other systems.
The integrated MOSFETs of the TPS544 28DDA make it ideal for industrial applications. It can be used to regulate voltage and current in motor control systems, building automation, and energy harvesting. In automotive applications, it can be used in a wide range of systems from lighting to navigation. Because of its robust design and wide range of input and output voltages, it is the voltage regulator of choice for even the most demanding applications.

Working Principle

The TPS544 28DDA is a cascaded switch topology DC-DC voltage regulator. In operation, the integrated switches in the device are switched on and off at a frequency which is determined by a fixed or an externally provided clock signal. As the switches are switched on and off, current is drawn from the input voltage source and stored in the switch\'s output capacitors. When the output voltage needs to be regulated, the voltage on the output capacitors is compared to the reference voltage. If the output voltage is higher than the reference voltage, the switch is turned off, if it is lower, the switch is turned on.
The output voltage is regulated by controlling the switching frequency, which is determined by an external clock signal or an internal oscillator. By adjusting the frequency, the output voltage is kept at a constant level. The output voltage can also be adjusted by connecting an external resistive divider at the feedback pin of the device. The device also features “ripple rejection modulation” which is used to reduce the output voltage ripple and increase the system’s noise immunity. Overall, the TPS544 28DDA offers very accurate and efficient voltage regulation, making it the ideal solution for many applications.

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