TPS51117PWR Integrated Circuits (ICs)

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The TPS51117PWR is a high-performance synchronous DC/DC step-down converter with integrated power devices from Texas Instruments. The converter provides an up to 15A continuous output current on a single output by integrating two power MOSFETs and an active-current- limit control circuit. It can be used for applications requiring high efficiency and low output voltage ripple. The device supports low quiescent current operation, low output voltage of 0.6V and can be conveniently used with a wide variety of output capacitors.

Application Field

The TPS51117PWR is suitable for a variety of applications, including 5V to 1.2V conversion in mobile system designs, notebook and tablet PCs, automotive and industrial applications. In addition, it can also be used in high current/low current operation. It has built-in functions that make it suited to a wide range of applications, including dual output conversion, mixed voltage output and supplying power to two peripheral devices.

Working Principle

The DC/DC converter of the TPS51117PWR includes a control system and a switch-mode power supply converter. The control system is composed of a voltage-mode PWM controller, gate drivers and power MOSFETs. The power MOSFETs ensure efficiencies up to 96%, as well as having low input voltage operation. The power MOSFETs are controlled by the PWM controller, which applies a PWM signal to the gate drivers and controls the power MOSFETs switching frequency. There is an active-current- limit control circuit, which provides a current limit for the device to protect the power MOSFETs from between operating point.

The DC/DC converter uses a synchronous (diode-emulate) topology, where the power MOSFETs are operated in synchronism with external clock signals generated externally by the user or supplied by the device itself. The device offers adjustable output voltage through an external compensation network, allowing the user to fine tune the performance of the converter. The device also supports one-cycle and two-cycle power up and power down operation, making it suitable for applications such as auxiliary and standby supplies.

In addition, the TPS51117PWR features a programmable bias voltage that regulates the bias voltages required by other controlling and regulating peripherals. There is a Complete ON/OFF pin for power enable/disable function, and an output voltage enable/disable pin for output voltage enable/disable operation. The device also supports low input voltage operation and low-noise SEPIC topology operation.

Conclusion

The TPS51117PWR is a high-performance synchronous DC/DC step-down converter that provides an up to 15A continuous output current on a single output and supports combined PFM/PWM operation. It features low input voltage operation and low output voltage ripple. The device supports one-cycle and two-cycle power up and power down operation, as well as various functions such as dual output conversion, mixed voltage output, and supplying power to two peripheral devices. In addition, it has adjustable output voltage, low quiescent current operation, and a programmable bias voltage. In summary, the TPS51117PWR is suitable for a wide range of applications.

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