TPS62402DRCR

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TPS62402DRCR Application Field and Working Principle

The TPS62402DRCR is a synchronous step-down DC/DC converter from Texas Instruments. It is designed to operate over a wide input voltage range of up to 8V and provides an output voltage adjustable from 0.8V to 6V. The device features a high efficiency, low noise switching regulator and requires fewer external components for power solutions in battery-powered or other space-critical systems. It is ideal for powering peripherals, such as CPUs, DSPs,SOCs and FPGAs.

The TPS62402DRCR is part of the PowerStack family of switching voltage regulators. It is a synchronous buck converter and integrates two-level regenerative control. It provides high efficiency at light load with a quiescent current of 0.6µA. This enables high efficiency and low power consumption, suitable for battery-powered applications and wireless sensors. The device also offers a wide range of programmable features, such as adjustable output current limit and output voltage, overshoot protection, user-selectable soft start, adjustable power-saving mode and enable/disable control.

This device\'s main application field is in battery operated equipments which need low battery current and long operation times.

Working Principle

The TPS62402DRCR operates by producing a regulated output voltage from an input supply. The device works by periodically switching on a high frequency power MOSFET switch. When this switch is on, input voltage is supplied to one terminal of an inductor and a load across the output. When the switch is turned off, a diode along with a storage capacitor delivers the energy stored in the inductor to the load. The boundary between these two critical portions of the operation is defined by a design which uses two control loops. This allows higher efficiency, better dynamic response and lower noise operation.

The device operation is based on a voltage mode current mode controller for both voltage regulation and current limiting. The under voltage lockout (UVLO) feature prevents the converter from starting up if the input voltage is lower than the minimum operating voltage. An internal PWM generator controls the switch on and off timing and regulates the switching frequency. The integrated soft-start circuitry sets the output voltage gradually to its desired value when the device is switched on.

The TPS62402DRCR features a low-noise, low dropout mode to reduce the no-load quiescent current of the converter in light load applications, while providing the same output accuracy as in full load operation. This is accomplished by controlling the switching frequency in response to the load current. The switching frequency is scaled down while the load current is below 50mA, while the same frequency is maintained above 50mA.

Conclusion

The TPS62402DRCR is a compact, high efficiency synchronous step-down DC/DC converter ideal for battery-powered and other space-critical applications. It provides programmable features, such as adjustable output current limit and output voltage, overshoot protection, user-selectable soft start, adjustable power-saving mode and enable/disable control. The device operates using two-level regenerative control and features a low-noise, low dropout (LNLD) mode that reduces the quiescent current of the converter in light load applications, while providing the same output accuracy as in full load operation.

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