TPS54A20RNJT

Voltage - Input (Max):	14V
Supplier Device Package:	20-VQFN-HR (4x3.5)
Package / Case:	20-VFQFN
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	Selectable
Current - Output:	10A
Voltage - Output (Max):	2V
Voltage - Output (Min/Fixed):	0.5V
Series:	SWIFT™
Voltage - Input (Min):	8V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The TI TPS54A20RNJT is a high-performance synchronous buck regulator designed specifically to power high-end notebook, ultra-mobile, and tablet applications. It provides flexible output voltage setting and current limiting while being capable of delivering up to 20A continuous output current. In addition, it also features input voltage range of up to 20V and a logic level shut-down input.

Application Field

The TPS54A20RNJT is suitable for a wide range of applications ranging from low power, point-of-load conversion for a variety of ultra-mobile devices, to high performance and high output current requirements in notebook applications. The device operates from an input supply of 4.5V to 20V and the adjustable output voltage range enables it to be used for powering a number of embedded processors and cores. Its wide input voltage range ensures that it is suitable for automotive, industrial, medical and communication system applications.

Working Principle

The TPS54A20RNJT’s main operation is based on a FET-bridge synchronous buck switching regulator. This application consists of four power switches, namely, two high side P-Channel MOSFETs, two low side N-Channel MOSFETs, a compensation network and the Driver IC. The duty cycle of each switch is determined by the synchronous current regulation loop and the output voltage loop. The output voltage loop works by adjusting the current mode loop’s current limit to maintain the output voltage at the desired level. The synchronous current regulation loop is responsible for deliver the maximum output power to the load.When the supply voltage is more than the output voltage, the P-channel MOSFETs (high side MOSFETs) are turned ON and the N-channel MOSFETs (low side MOSFETs) are turned OFF. This creates a voltage drop across the low side MOSFET which results in a current flow to the output inductor. The current flowing through the output inductor creates a magnetic field. This field is opposed by the diode connected to the output capacitor and the voltage is limited. When the voltage across the output capacitor reaches the desired level, the low side MOSFET is turned ON and the magnetic field collapses. The excess current stored in the inductor is now transferred to the output capacitor and maintains the voltage across the output capacitor at the desired level. When the load current decreases, the current limit loop reduces the current limit in order to maintain the output voltage.

Conclusion

The TPS54A20RNJT is a high-performance DC-DC synchronous switching regulator that provides flexible output voltage setting and current limiting for applications ranging from low power point-of-load conversion to high performance high output current requirements. The device is suitable for a wide range of applications including but not limited to automotive, industrial, medical and communication systems. It utilizes a FET-bridge synchronous buck switching method to regulate the output voltage. The two loops that control the current regulation and voltage regulation allow the device to operate in a wide input voltage range and to deliver up to 20A continuous output current.

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