TPS62402DRCTG4

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TPS62402DRCTG4 – PMIC Voltage Regulators – DC DC Switching Regulators

The TPS62402DRCTG4 is a highly efficient, dual synchronous step-down regulator from Texas Instruments. This device is optimized to achieve up to 95% efficiency from a 1V to 0.6V output at 1A and up to 88% efficiency at 2A.

Application Field

The TPS62402DRCTG4 is designed to be used in portable devices that require low power and efficient energy management. This device has been designed to efficiently provide power to:

• Digital signal processors
• Microprocessors
• RF transceivers
• Wireless handsets

Working Principle

The TPS62402DRCTG4 is a synchronous, step-down converter that is able to regulate a wide range of output voltages. The device employs a dual synchronous buck architecture with two independent outputs, one for each phase. This architecture utilizes two phase input allowing for the power supply to phase-shift the current from each phase, resulting in very high efficiency. The main function of the TPS62402DRCTG4 is to step down the output voltage (Vout) from the input voltage (Vin). The output voltage is controlled via an internal voltage reference and feedback pins. When the output voltage falls below the internal reference, the controller begins switching the top switches of each phase alternately, charging the output capacitor and supplying power to the load. On the other hand, when the output voltage rises above the internal reference, the controller will close the top switches of each phase and the bottom switches of each phase will produce current to the low side of the output capacitor, leading to a decrease in the output voltage.

The switching frequency of the TPS62402DRCTG4 is programmable with a resistor and a capacitor. The frequency is set to 800kHz by default, but can be adjusted between 500 and 1.1MHz.

The output voltage and current of the TPS62402DRCTG4 are protected by current limit, short circuit and thermal protection. An overvoltage protection circuit is also elaborated to avoid over-voltage conditions during fault conditions or load transient.

In order to maximize the efficiency, the TPS62402DRCTG4 employs a power-save mode. This operating mode is activated when the load drops below 10% of its maximum current limit and it reduces the switching frequency to maintain high efficiency.

The TPS62402DRCTG4 also incorporates a low power standby mode. When the Enable pin is switched to a logic low level, the device enters a low-power sleep mode and the power consumption of the device is reduced to less than 5μA.

Conclusion

The TPS62402DRCTG4 is a low power, step-down synchronous DC/DC regulator from Texas Instruments that is optimized for high efficiency, across a wide range of input and output voltages. With adjustable output voltage and current limit, over-voltage protection feature and low power standby mode, the TPS62402DRCTG4 is an ideal choice for a wide variety of applications, such as wireless handsets, digital signal processors, microprocessors and RF transceivers.

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