TPS51120RHBR Integrated Circuits (ICs)

Frequency - Switching:	--
Base Part Number:	TPS51120
Supplier Device Package:	32-VQFN (5x5)
Package / Case:	32-VFQFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, On Time Control, Power Good
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	D-CAP™
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 28 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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TPS51120RHBR Application Field and Working Principle

The TPS51120RHBR is a synchronous step down switching regulator that belongs to the Power Management Integrated Circuit (PMIC) – Voltage Regulators – DC DC Switching Controllers category. This device. It has been specifically designed for low-noise, high-efficiency power supply solutions for core supplies for applications processors in mobile platforms such as notebooks, tablets, and smartphones. The TPS51120RHBR offers a 6.5V to 27V input supply range, allowing it to be used in a wide variety of power supply solutions. It has a maximum output current of 5A and a wide input voltage range. It also features a very low quiescent current (1.2μA typical) and lower maximum enabling currents, allowing it to be used in ultra-low power applications. Furthermore, the device features a selectable frequency of 200/400kHz with synchronous rectification as well as output current and UVLO protections. This makes the TPS51120RHBR a highly efficient, low-noise PMIC device suitable for applications that demand high-performance power electronics solutions.

Working Principle

The TPS51120RHBR utilizes a hysteretic switching scheme to regulate the output voltage. This process involves the use of a comparator that has two inputs: one for the feedback voltage and one for a reference voltage (VREF). The feedback voltage is compared to a precise voltage reference and when the feedback voltage goes above the reference voltage, the output is disabled and the switching transistors are off; when the feedback voltage goes below the reference voltage, the output is enabled and the switching transistors are on. This switching scheme allows the regulation of the output voltage without the need for an error amplifier, hence providing a compact and cost effective solution. The switching frequency of the TPS51120RHBR can be programmed between 200kHz and 400kHz, allowing for the optimization of efficiency and component size for a given application. This is done by simply connecting a resistor setting the operating frequency. The device utilizes synchronous rectification to improve the overall system efficiency. In synchronous rectification, the body diodes of the external MOSFETs are replaced by N-channel and P-channel transistors having a low gate charge and low gate resistance to minimize switching losses. This results in a higher efficiency and longer battery life.

Conclusion

In conclusion, the TPS51120RHBR is a high efficiency, low noise DC/DC switch controller specifically designed for low-noise, high-efficiency power supply solutions for applications processors in mobile platforms such as notebooks, tablets, and smartphones. Its features include a 6.5V to 27V input supply range, a maximum output current of 5A and a wide input voltage range. Furthermore, it features a selectable frequency of 200/400kHz with synchronous rectification as well as output current and UVLO protections. All these features make the TPS51120RHBR a highly efficient, low-noise PMIC device suitable for applications that demand high-performance power electronics solutions.

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