TPS54239DDA

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TPS54239DDA integrated circuit (IC) is a modern, battery-powered, low quiescent current DC-DC regulator, designed specifically to regulate and convert a battery-supplied input voltage into a selectable output voltage. It offers high efficiency, low noise, fast transient response, and excellent power supply rejection. The IC is ideal for use in a stepping down a mobile battery, such as an LDO, or for light/heavy-load applications.

Application field of TPS54239DDA come in two categories:

• Step-down applications: This type of application is appropriate for applications requiring the conversion from a higher input voltage to a lower output voltage. Common step-down applications include those where the input voltage and output current vary over time. Examples might be the operation of sensors and actuators, handheld and industrial control equipment, battery-powered mobile communication devices, etc.

• Step-up applications: In contrast, step-up applications require the conversion from a lower input voltage to a higher output voltage. In these cases, the TPS54239DDA is able to provide the increased output voltage while consuming less energy than other solutions. As a result, this type of regulator is well suited for battery-powered consumer and industrial IoT applications, such as those requiring both variable current pulse-width modulation and variable switching-mode PWM to implement power management.

The working principle of TPS54239DDA can be divided into four stages:

• In the input stage, the TPS54239DDA’s built-in linear regulator provides a low dropout voltage for a voltage supply of up to 3V. At this stage, a high efficiency power transistor is used to reduce input current ripple and thus to improve efficiency.

• In the second stage, the IC uses an efficient, switching buck regulator with a wide step range to convert the input voltage to the designed output voltage. It utilizes an improved voltage mode control with an outer voltage loop and an inner current loop. This helps to optimize efficiency in typical and light/heavy-load applications.

• In the third stage, the TPS54239DDA uses a pulse-width modulated (PWM) voltage regulator to maintain output voltage accuracy during the conversion process. In addition, its constant-frequency, current-mode PWM provides good ripple-rejection, leading to lower EMI noise and superior transient response.

• In the final stage, the IC’s thermal shutdown circuitry automatically increases the DC-DC switching frequency to protect the regulator’s components. It also helps to reduce voltage stress while keeping the maximum temperature well below the IC’s maximum operating temperature.

The TPS54239DDA can provide both a high-efficiency output voltage and a wide step range for a wide range of applications. It is well suited for those requiring variable current pulse-width modulation and variable switching-mode PWM to implement power management. The IC delivers excellent power supply rejection and fast transient response, making it ideal for use in battery-powered mobile communication devices or for stepping down a mobile battery, such as an LDO.

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