TPS62171QDSGRQ1 Integrated Circuits (ICs)

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Introduction to TPS62171QDSGRQ1 Application Field and Working Principle

TPP62171QDSGRQ1 is a high-efficiency mono-channel, synchronous step-down converter with an output voltage range of 0.6V to 5.5V and a maximum output current of 200mA. This product belongs to the DC DC switching regulator series of PMIC - Voltage Regulators. It is suitable for battery-powered applications and is usually used as a low-voltage DC-DC regulator for embedded systems.

Features of TPS62171QDSGRQ1

TPS62171QDSGRQ1 has several significant advantages. For example, it provides high efficiency, low standby current, fast load transient response and cyclic distribution of current. Many of the IC’s features are configurable; a user may select one of two voltage pre-set options or a user-defined output voltage. The device includes an integrated 500-mA low-dropout (LDO) regulator for pre-configured output voltages of 1.20V and 1.8V. Moreover, it has an effective power detect function to reduce quiescent current, a per-channel enable and/or disable to increase flexibility, and an FX control pin for increasing the maximum output current.

Working Principle of TPS62171QDSGRQ1

TPS62171QDSGRQ1 is a DC DC step-down (buck) synchronous regulator with a maximum current output of 200mA. It is designed to deliver the maximum output current with a reasonable load stability. Both the voltage loop and the current loop work together to control the output voltage at a nominal level over a wide operating temperature range and to provide load-transient compensation.

TPS62171QDSGRQ1 can operate in 1.8V and 1.2V output pre-configurations and ultra-low-power shutdown mode to reduce system-level power consumption. There is also a 300mV reference voltage available to allow the output voltage to be adjusted to the requirements of a particular system. The operations of the device include pulse-width modulation (PWM) control, over-current protection, output voltage regulation and synchronization up to 2MHz.

The TPS62171 regulates the output voltage by controlling the ratio of a PWM high-state and low-state of the switch series connected between the input voltage VIN and the output voltage VOUT. The SW node works as a switch transistor with a driven PWM signal. When the switch is on, the voltage at the SW node is the same as the input voltage VIN (VSW = VIN), so that the inductor current increases. At the same time, the output capacitor starts to charge up. When the switch transitions to the off state, the voltage at the SW node decreases while the inductor current continues to flow into the output capacitor, charging it up and increasing the output voltage VOUT.

The current loop controls the current that flows through the inductor and the switch. The current loop monitors the inductor current flowing through the current sense amplifier (CSA) and the other sense resistor (RSNS) in the current loop. The output of the current loop is used to control the switching frequency of the device when the Load Governing Mode (LGM) is enabled. This mode controls the minimum inductor current, which is used to guarantee a constant frequency operation even during light loads.

By enhancing the power detection and built-in 500mA LDO, the current and the state of the TPS62171QDSGRQ1 can be controlled effectively in many applications. The device provides a range of features that are useful in many different applications including automotive, industrial, computing, consumer, communication and industrial control applications. With its fast response speed, high accuracy and low power consumption, it is a suitable choice for many portable and embedded systems.

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