TPS62112RSAT

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The Texas Instruments TPS62112RSAT is a synchronous buck DC/DC converter that is designed to deliver a low output voltage in space-constrained applications. It supports efficient low-standby quiescent currents over a wide input voltage range with up to 92% efficiency. The TPS62112RSAT is a synchronous step-down regulator with a wide range of output current capabilities that allow the user to tailor the solution for the end application. This device is ideal for powering low power point of load loads, such as SDRAM, LCD displays or interface ports, in consumer audio equipment, digital copiers and portable communications devices.

The TPS62112RSAT is an adaptive on-time synchronous step-down DC/DC converter that operates at a fixed frequency of up to 2.2 MHz. The PWM control provides an optimized balance between efficiency and fast transient response. The TPS62112RSAT features a unique adaptive on-time (AOT) control to reduce switching losses during light loads while maintaining a fairly constant frequency operation. The AOT control also ensures light load efficiency above 90% efficiency. The other features include low quiescent current, programmable current limit, internal compensation, over temperature protection, output short-circuit protection, and adjustable output voltage.

The TPS62112RSAT is designed to support for voltage regulation and conversion in applications with input voltages ranging from 2.5V to 16V with an output voltage range from 0.6V to 6V with an adjustable output current up to 3A. The excellent thermal performance of the TPS62112RSAT makes it an ideal choice for many consumer and communication applications, which can efficiently convert power in a very small package.

The Working Principle of TPS62112RSAT is based on a high-frequency synchronous buck switching regulator with adaptive on-time control. The device contains a high side and low side power MOSFET, an adaptive switching control block and current limit circuits. During normal operation, the high side and low side MOSFETs switch alternately with dead times, converting the input voltage to the required output voltage. The duty cycle of the two MOSFETs is controlled by the adaptive on-time control block. The adaptive on-time control block is a switched-capacitor peak current mode loop which actively adjusts the switching on time to maintain the output voltage. The switching frequency is adjustable up to 2.2MHz and it is automatically reduced during light load to reduce the switching loss. The on-time is automatically adjusted depending on the load and input voltages, making the control loop more efficient at all time. The current limit circuit is used to protect the MOSFETs from over-current and short-circuit conditions by limiting the output current.

The TPS62112RSAT DC/DC switching regulator is a compact and efficient power converter that is optimized for energy-conscious, space constrained applications. The device combines high efficiency, small size and high switching frequency allowing the designer to create a power solution that fits their particular application perfectly.

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