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PMIC - Voltage Regulators - DC DC Switching Regulators

TPS54611PWPG4 application field and working principle

The TPS54611PWPG4 from Texas Instruments is a high-efficiency, 2-A, 2-MHz synchronous variable-frequency step-down converter. This device is characterized for operation from a 4.5 V to 24 V input voltage range. It features integrated high- and low-side MOSFETs, and comes in a 10-A, 14-V PG-DSO-8 (5x5) package. This makes it suitable for many applications. It is designed to have high efficiency, low noise, low EMI and adjustable switching frequency.

The TPS54611PWPG4 is a current-mode variable-frequency step-down converter, meaning that it is able to quickly respond to changes in the load current. This improved dynamic response reduces output voltage and current ripple, increases throughput, and extends battery life. The variable-frequency mode available in this device, provides the user with efficient operation without sacrificing the noise performance and system stability. Alternatively, if needed, the user can go in to continuous conduction mode (CCM) by using the external compensation components R CSI and C CSI.

Regarding safety use, the TPS54611PWPG4 supports the open drain fault signal pin ‘FAULT’ designed to alert the system of an over-current situation. The ‘FAULT’ pin is activated when the sensed inductor current reaches 1.2 times the programmed VALRT limit. By this, an over-current condition can be detected and a good protection can be passed on to the system components.

The wide input voltage range of the TPS54611PWPG4 makes it suitable for applications such as PDAs, digital still cameras and camcorders, cellular phones and other mobile applications. Furthermore its high switching frequency of 400 kHz allows for the use of small size components.

The TPS54611PWPG4 contains an integrated dual-N-channel switch and a low-side R DS(on) P-channel switch that can be used for normal step-down operation, or it can be used as a synchronous buck regulator. The switching duty cycle is adjustable around DCM and CCM operations, by using an external resistor. The low-side driver has an internal pull-down resistance that allows for synchronous switching when the chip is used with an external low-side pull-down resistor. Also the TPS54611PWPG4 has an EN pin throughwhich the device can be enabled and disabled.

The TPS54611PWPG4 can provide a low dropout output voltage of 0.8 V at light load current with the help of a low on-resistance P-channel MOSFET. The device also has a programmable soft-start circuitry to prevent any in-rush current at startup. It also contains an output discharge pin which allows the output capacitance to be discharged to ground whenever the power switch is disabled. This helps in breaking the body diode conduction, thus saving the power loss.

In summary, the TPS54611PWPG4 from Texas Instruments is a high-efficiency, 2-A, 2-MHz synchronous variable-frequency step-down converter. It offers a wide input voltage range from 4.5 V to 24 V with adjustable switching frequency.The device contains an integrated dual-N-channel switch and a low-side P-channel switch for normal step-down operation, or as a synchronous buck regulator. The TPS54611PWPG4 is suitable for applications such as PDAs, digital still cameras and camcorders, cellular phones and other mobile applications.

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