TPS51117PWRG4

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TPS51117PWRG4 Application Field and Working Principle

The TPS51117PWRG4 is an easy-to-use power-conversion integrated circuit that improves system performance, simplifies layout, and reduces overall risk. It belongs to the type of PMIC (Power Management Integrated Circuits) - particularly the Voltage Regulators - DC DC Switching Controllers. This integrated circuit enables designers to reduce their system size and cost while providing high efficiency and power density.

The TPS51117PWRG4 is a synchronous, dc-dc step-down controller that operates from an input voltage of 5.5 V to 36 V. With its wide input range, it is suitable for use in various applications such as servers, notebooks, telecommunication devices and industrial equipment as well as automotive, automotive powertrain and charging station applications. The output voltage can be regulated from 0.6 V to 30 V, which can be selected theoretically for different loads. It provides two external side-channel pins for voltage, temperature and over-current sensing, protection and accuracy control.

The TPS51117PWRG4 employs the DirectFET topology to deliver a highly efficient solution with good EMI performance. It also features programmable UVLO and fixed UVLO, programmable soft-start, and over-temperature protection (OTP) functions, as well as adaptive gain for pulse-skipping/discontinuous-conduction mode operation. Its high-side and low-side gate drivers have separate outputs, allowing for independent control of the upper and lower DMOS devices.

The circuit has a typical efficiency of up to 95 percent, an operating temperature range of -40 °C to 125 °C, a switching frequency up to 1.2 MHz and a quiescent current of less than 25 µA. In addition, the circuit is compliant with the stringent AEC-Q200 automotive standard.

In terms of working principle, the TPS51117PWRG4 scalable device integrates dual DMOS transistors configured as an H-Bridge. The control signals for these transistors use a constant current technique to fulfill accurate control of switching. The synchronous rectifier controller directly senses output current, which allows for high conversion efficiency, low ripple and high power density. The circuit dynamically adjusts the switching frequency, synchronizing with the input voltage and load. In addition, the TPS51117PWRG4 employs an external resistor to assist in level shifting, preventing shoot-through currents during the transition from active state to standby state. This efficient, high-performance device can significantly boost the performance and reliability of a variety of systems.

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