TPS79927DDCT

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The TPS79927DDCT is a linear voltage regulator typically used for post-regulation in multi-regulator applications. It is a low-dropout (LDO) linear voltage regulator designed for low-voltage post-regulation in applications from 1.3V to 3.5V. The device features a power-on reset pin and an enable signal, offering low input voltages and quiescent current performance. TPS79927DDCT is ideal for notebook PCs, digital still cameras, ultrabooks, and other battery operated systems.

Features

• Wide 2.6 V to 14.5 V Input Voltage Range
• 2 MHz Fixed Frequency Operation
• Power-On Reset (POR) Feature
• Selectable 300 mV or 100 mV Dropout Voltage
• Ultra-Low 150 μA Quiescent Current at Light Loads
• Flexible enable Signal
• Programmable Start-Up/Shutdown Sequencing
• Thermally Enhanced 12-Lead TSSOP-PW and 8-Lead MSOP-EP Packages

Application Field

The TPS79927DDCT is ideal for battery powered computing systems, such as notebook PCs, digital still cameras, ultrabooks, and other battery operated systems; in post-regulation applications requiring low dropout performance and low-voltage output regulation. It is recommended for use in battery-powered systems requiring output voltage levels from 1.3V to 3.5V.

Working Principle

The TPS79927DDCT is a linear voltage regulator (LDO) designed for low-voltage post-regulation applications from 1.3V to 3.5V. The device features a selection of power-on reset (POR), enable signal, and low quiescent current performance. The TPS79927DDCT has a wide 2.6V to 14.5V supply voltage range, with a fixed 2 MHz frequency. The LDO provides a dropout of 300mV or 100mV depending on the output voltage. The device also offers low quiescent current of 150 μA at light loads and flexible enable signal controlling the output voltage.

At power-up, the chip is configured in active mode and is Enabled, when the voltage on the /EN pin drops below 0.8V the device enters Shutdown. When entering the Shutdown state the chip will disconnect the output to the output capacitor and reduce the quiescent current to < 10μA. In Shutdown, the POR will prevent this and the device will not be enabled until the /POR pin is released. When enabled the Start-Up sequencing will begin, allowing output voltage to reach the desired level before the device is ready for normal operation.

The device is also designed to provide a stable output voltage over a wide range of temperature and load conditions. During operation the regulation of the output voltage is provided by an internal error amplifier, which controls the voltage setting via the resistor divider. By varying the resistor values, the output voltage can be readily adjusted.

In summary, the TPS79927DDCT is an ideal linear voltage regulator, which can be used in multi-regulator applications requiring low-voltage post-regulation. Its wide input voltage range and fixed 2 MHz frequency make it an ideal solution for battery-powered systems, with output voltage levels from 1.3V to 3.5V.

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