TPS61091RSAR

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TPS61091RSAR is a 3A integrated synchronous step-down DC-DC converter. It integrates a high efficiency internal switch mode power supply and a low dropout (LDO) regulators to provide output voltage of 1.2V to 5.5V with ultra low quiet current of 5μA. Though the device is small in size about 3.5 x 2 laps in application dimension, it can provide high power output to drive loads up to 3A with regulated output voltages. Although the package is relatively small, all the features and functions of this device are comprehensive and powerful, which make it ideal for general-purpose converter application.

The TPS61091RSAR device belongs to PMIC (Power Management Integrated Circuit) category, Voltage Regulators unit and DC-DC Switching Regulators subcategory. It integrates a wide range of features and functions allowing designers to obtain low component count solutions. The device features an integrated 2.5V linear regulator and a synchronous step-down DC-DC converter. The device supports a wide input voltage range from 2.4V to 5.5V, and offers adjustable output voltage from 1.2V to 5.5V. The device offers a low drop-out (LDO) mode and operates at a fixed 3A load current with a throughput of up to 100 MHz.

The working principle of TPS61091RSAR DC-DC switching regulator is based on the comparison made byerror amplifier, which compares the reference voltage to the feedback voltage from output. If theoutput voltage falls below the programmed setpoint, the output stage switches on, allowingcurrent to pass through inductor and pump up the output voltage. Conversely, if the outputvoltage is higher than the setpoint, the output stage turns off, and the output voltage level isdetermined by the off-state configuration of the output stage and the RDSON of the externalPower MOSFET. It should be noted that the output stage can be activated over the entire inputvoltage range of the device, as synced by pulse width modulation (PWM) signal.

The device employs synchronous rectification with an efficient conversion from input to output,while at the same time offering high power density solutions in compact packages. Itcommunicates with a microcontroller unit (MCU) by using a PMBus I2C interface for far distanced power monitoring. To ensure the highest system reliability, the hysteretic current-mode control provides stable operation from light to full load, as well as fast loop response and a minimal number of external components. The device also offers protection functions against over load, over temperature, and over voltage conditions.

In conclusion, TPS61091RSAR DC-DC Switching Regulators boast features such as compact size, wide input voltage range, 3A integrated synchronous step-down DC-DC converter, PMBus I2C interface with far distanced power monitoring, and comprehensive protection functions. This makes it ideal for a range of general-purpose converter applications.

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