TPS53125RGET Integrated Circuits (ICs)

Frequency - Switching:	350kHz
Base Part Number:	TPS53125
Supplier Device Package:	24-VQFN (4x4)
Package / Case:	24-VFQFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	D-CAP2™
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 24 V
Output Phases:	1
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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TPS53125RGET Application Field and Working Principle

The TPS53125RGET DC-DC buck controller from Texas Instruments is an adjustable and synchronous body diode rectified Buck switching voltage controller that provides the capability of precisely regulating hub voltage outputs. It is targeted at applications such as motherboards, embedded tools, and consumer electronics. This paper will discuss the application fields and work principle of the TPS53125RGET.

Application Fields and Typical Circuit

The TPS53125RGET is particularly well-suited for notebook and other computing devices. The device is often used to regulate the voltage and current in these applications, allowing computing devices to directly access external power sources. Additionally, it can also be used in industrial equipment, automotive applications, and consumer electronics, such as televisions and mobile phones.The block diagram of the TPS53125RGET is shown in Figure 1. It is designed to enable control of a synchronous rectified buck converter with one external FET. It operates from a 3 V to 5.5 V input voltage range, making it particularly well-suited for use in portable and mobile applications.

Figure 1: Block Diagram of TPS53125RCET

The TPS53125RGET is packaged in a PQFN (Plastic Quad Flat No-Lead) package and provides a range of protections to ensure reliable operation, including under-voltage lockout, over-current protection, and over-voltage protection. Additionally, the device includes a power-good monitor with an adjustable delay time and an adjustable slew rate, making it suitable for applications that require precise control of output voltage.

Working Principle

The TPS53125RGET can be used to regulate both the output voltage and current in a buck converter circuit, as shown in the simplified buck converter circuit diagram in Figure 2. The device uses an internal PWM driver to switch an external N-channel MOSFET at the same frequency as the input voltage.

Figure 2: Simplified Buck Converter Circuit Diagram using TPS53125

The PWM comparator compares the feedback voltage across an external FB divider divider (representing the output voltage) with a reference voltage. It then adjusts the duty cycle of the PWM signal, causing the MOSFET to switch at the same frequency, but with a different duty cycle. This causes the output voltage to be regulated. The IC also includes an internal soft-start circuit, which ensures that the output voltage ramps up gradually.The device also has the capability to adjust the output current. It does this by measuring the current flowing through the inductor and adjusting the duty cycle accordingly. This ensures that the output current does not exceed a certain value.In summary, the TPS53125RGET is a well-designed and powerful DC-DC buck controller for notebook and other computing devices, consumer electronics, automotive applications, and industrial equipment. It is designed to provide precise control of the output voltage and current, and its integrated protections ensure reliable operation in a range of operating conditions.

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