TPS62234DRYT

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The TPS62234DRYT is a DC/DC step-down switching voltage regulator (also referred to as a “buck” regulator) that delivers up to 3A of load current in a small, thermally enhanced, 5-pin TDFN package. It operates from a 2.3V to 5.5V input voltage range and includes a bypass regulator to reduce overall power consumption. Its output voltage is adjustable down to 0.8V, making it suitable for applications requiring an output voltage below the input.

Applications

The TPS62234DRYT can be used in multiple mobile and handheld audio/video applications, such as for converting the battery source to the various voltage rails required for multimedia devices. It is ideal for powering DSP/CPU cores and peripherals in portable media players and digital still cameras/camcorders.

The TPS62234DRYT is well-suited for powering any point-of-load supplies that require a step-down voltage from a higher battery voltage. It is particularly beneficial for the default 5-V supply for a USB port, providing high efficiency under light load conditions with minimum power loss when compared to a linear regulator.

Features

The TPS62234DRYT provides design benefits that help to reduce the overall solution size and cost:

• The regulator is based on a voltage-mode, peak-current-mode, current-mode switching topology, which provides low output voltage ripple, low quiescent current, and fast transient response.
• It incorporates an integrated switch-node synchronous rectifier (SR), which reduces the number of external components and their associated losses.
• The internal loop compensation eliminates the need for external capacitors or inductors, further reducing the solution size.
• The regulator is able to operate with an input voltage which is higher than the output voltage, enabling an efficiency of up to 96% at a 1.8V output voltage.
• An integrated soft-start feature enables easy power management of the total system.

Working Principle

The TPS62234DRYT is composed of three main blocks: the driver circuit, the power switch, and the synchronous rectifier. The driver circuit uses the voltage-mode, peak-current-mode, current-mode switching topology to regulate the output voltage of the regulator, and the power switch consists of an N-MOSFET and the SR, which improves overall efficiency.

The voltage-mode, peak-current-mode, current-mode switching topology works by using an error amplifier to compare the sensed output voltage to the reference, and generating an error signal. This signal is then integrated in the pulse-width-modulation (PWM) section, where a high gain and a loop compensator are used to determine the pulse width, and generating the PWM signal for the switch driver. The PWM signal then drives the power switch to turn on and off, generating a rectangular waveform which transfers the energy from the input to the output. The synchronous rectifier (SR) reduces the losses of the power switch by providing a path for the current to flow from the output to the input when the switch turns off.

The main benefit of the voltage-mode peak-current-mode current-mode switching topology is that it enables the regulator to respond quickly to changes in the load current and to maintain a stable output voltage while providing excellent line and load transient response.

Conclusion

The TPS62234DRYT is a high-efficiency step-down switching voltage regulator that is capable of providing up to 3A of output current in a small footprint. Its low quiescent current, fast transient response, and integrated synchronous rectifier make it an ideal solution for applications that require a regulated output voltage below the input source.

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