TPS40195RGYT Integrated Circuits (ICs)

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TPS40195RGYT Application Field and Working Principle

The TPS40195RGYT is a synchronous step-down converter with integrated MOSFETs from Texas Instruments. It belongs to the Power Management IC (PMIC) series of integrated circuits. Particularly, it belongs to the family of Voltage Regulators, and more specifically to the subset of DC DC Switching Controllers.

Introduction

The TPS40195RGYT is designed to provide a cost-effective, adjustable, synchronous buck regulator which operates in a wide range of applications. It is designed to provide high efficiency up to 96% at light loads and up to 85% at full load. The device is a nanowatt sleep mode device that shuts down to less than 500nA in order to minimize quiescent current. This part also includes programmable undervoltage lockout (UVLO) as well as programmable overcurrent sensitivity.

Features

The TPS40195RGYT is packed with features, providing flexibility across a wide range of applications. Features include:

• Wide 3.2 V-20 V input voltage range
• Integrated gate drivers to reduce external component count
• Integrated logic and control circuitry.
• Programmable soft-start
• Programmable DC-DC voltage regulation
• Programmable frequency period

Main application

The TPS40195RGYT is mainly used in low power applications such as portable and wearable devices. Such devices may include industrial applications such as battery operated hand-held electronics, personal digital assistants (PDAs), multimedia devices, point-of-sale (POS) terminals, and so on. Moreover, it can also be used in automotive applications such as automotive telematics, GPS Navigation systems, e-Dashboards, and so on.

Working Principle

The TPS40195RGYT operates in a synchronous buck converter architecture. This type of architecture is based on the operation of two switching transistors, namely, the low-side and high-side MOSFETs. This architecture combines a high-powered MOSFET, connected in series with a lower-powered MOSFET, producing a high-side/low-side system. As the current in the high-side MOSFET increases, the current in the low-side MOSFET decreases, and vice versa. The combined on-time, which is the total amount of time the two transistors are turned on, controls the output voltage. The operating voltage of the low-side and high-side transistors are controlled by an internal error amplifier, which senses the output voltage and adjusts the gate-driver control signals accordingly. Once the output voltage is regulated, the cycle begins anew.

Conclusion

The TPS40195RGYT is a nanowatt sleep mode device that exhibits high efficiency and low quiescent current figures. It belongs to the family of Voltage Regulators, and more specifically to the subset of DC DC Switching Controllers. It is mainly used in low power applications and is particularly suitable for battery operated hand-held electronics, PDAs, multimedia devices, POS terminals, and so on. It operates in a synchronous buck converter architecture, which is based on the operation of two switching transistors; the low-side and high-side MOSFETs. This architecture provides high efficiency operation by controlling the combined on-time, of the two transistors, in order to regulate the output voltage.

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