TPS65261RHBR Integrated Circuits (ICs)

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TPS65261RHBR is a high-performance synchronous step-down DC-DC converter with 3.2 A output current capability, integrated power MOSFET, integrated bypass switch with slew rate control and a very low quiescent current of 300 nA. It is tailored for space-constrained solutions in cellular handsets, gaming machines, digital cameras and other handheld peripherals. It operates from 4.0 to 5.5 V input voltage range and provides full adjustable output voltage range up to 1.2 V.

Application Field

TPS65261RHBR from Texas Instruments is mainly applied in cellular handsets, gaming machines, digital cameras and other handheld peripherals. It can offer a much better performance compared to linear voltage regulation. Its ability to reduce the output voltage increases the efficiency of the voltage conversion, which results in a lower working temperature, making it much more suitable for mobile applications. It also helps to expand battery life due to its low quiescent current.

Working Principle

The TPS65261RHBR is a synchronous step-down DC-DC converter. It has a 3.2 A output current capability, an integrated power MOSFET, an integrated bypass switch with slew rate control, and a low quiescent current of 300 nA. The input voltage is converted to a lower, adjustable output voltage by controlling an externally applied voltage VIN by means of an on/off control mechanism. When VIN is greater than the reference voltage, the converter is in the on state and it connects the input supply to the output supply, allowing power to flow from the input to the output. When VIN goes below the reference voltage, the converter is in the off state and the input supply is disconnected from the output supply, preventing any further power flow from the input to the output.

The bypass switch of the TPS65261RHBR is also used to reduce the output ripple and noise and to improve the system efficiency. To control the bypass switch, the wired control logic introduces a soft start feature at the beginning of the voltage conversion. This allows the bypass switch to start providing a lower current path in order to reduce the voltage ripple and noise. Following the soft start period, the bypass switch will connect and disconnect the load periodically, thus controlling the power flow and effectively regulating the output voltage.

Overall, the TPS65261RHBR is an efficient, low quiescent current, synchronous buck DC/DC converter, which features a low output voltage ripple and low noise, making it ideal for current-sensitive applications such as cellular handsets, gaming machines, digital cameras, and other handheld peripherals.

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