TPS5420D

Voltage - Output (Min/Fixed):	1.22V
Base Part Number:	TPS5420
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	500kHz
Current - Output:	2A
Voltage - Output (Max):	31V
Series:	--
Voltage - Input (Max):	36V
Voltage - Input (Min):	5.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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TPS5420D Application Field and Working Principle

The TPS5420D by Texas Instruments is a synchronous step-down DC/DC converter with an integrated high-side power switch and low-side power switch with a 4.5 V to 17 V input voltage range. This device is ideally suited for automotive and industrial applications such as digital power supplies and point-of-load architectures. In addition, it is well-suited for microprocessor and memory power conversion applications.

Overview of the TPS5420D

The TPS5420D is a synchronous step-down DC/DC converter operating from a 4.5 V to 17 V input voltage range, capable of delivering up to 3.5 A of output current. It also operates over a wide-range of temperatures from -40°C to 125°C, making it ideal for automotive and industrial applications. It has excellent low-load efficiency due to its low-quiescent current architecture, and it consumes a very low 1 μA in shutdown mode. The TPS5420D is a 2-phase buck-boost, with a high-side switch, low-side switch and two inductors.

Features of the TPS5420D

The TPS5420D has a few features that make it ideal for use in automotive and industrial applications. These features include the following: -Integrated high and low-side switches with a 4.5 V to 17 V input voltage range-Internal compensation, allowing for reduced external component count -Pin and circuit-compatible with the TPS5420 and TPS5421 devices -Wide operating input voltage range from 4.5 V to 17 V-Low quiescent current and low EMI-Accurate output voltage and dynamic response -Programmable soft-start, current limit and power-saving mode-Over temperature and open-circuit protection-2-Phase Non-Synchronous Buck-Boost Converter Design

Uses of the TPS5420D

The TPS5420D can be used in a wide variety of applications. It is well-suited for automotive and industrial applications such as digital power supplies and point-of-load architectures.It is also suitable for microprocessor and memory power conversion applications due to its low-profile design and excellent EMI protection. The TPS5420D is an ideal solution for applications that require a high power-density, low output ripple, and fast transient response.

Working Principle of TPS5420D

The TPS5420D works by regulating an input voltage to an output voltage, which is typically done by using a voltage regulator. The output voltage is regulated by controlling the ratio of time the converter is operating and the amount of current flowing through the inductors. The output voltage is guaranteed to be stable and the output ripple to be minimized by using two inductors, two switching transistors, and two respective diodes. When the device is enabled, current flows through the input voltage and the Lx inductor, and the current flow is then blocked using the high-side (p-type) MOSFET switch. The voltage across the inductor is then constant during this period of time. When the device switches over to the other phase, the current flows in the opposite direction and the output voltage is regulated. The switching frequency of the TPS5420D can be adjusted based on the external resistance and the inductor values. The device can support a wide range of frequency from 0.9 MHz to 3.5 MHz.

Conclusion

The TPS5420D is a synchronous step-down DC/DC converter from Texas Instruments, designed specifically for automotive and industrial applications. It is a 2-phase buck-boost, with a high-side switch, low-side switch and two inductors. The device is also ideal for microprocessor and memory power conversion applications due to its low-profile design and excellent EMI protection. The features of the TPS5420D make it an ideal solution for applications that require a high power-density, low output ripple, and fast transient response. Additionally, the working principle of the TPS5420D is based on regulating the input voltage to an output voltage, and the output voltage is regulated by controlling the amount of current flowing through the inductors.

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