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PMIC - Voltage Regulators - DC DC Switching Regulators

DC-DC switching regulators are often used in applications that require different voltage levels from a single voltage source. The TPS62021DGQR DC-DC switcher from Texas Instruments is a step-down DC-DC converter with integrated MOSFETs and inductor. This device is suitable for supplying a digital circuit with up to 2 A from a single Li-ion battery, as it features high efficiency, fast transient response, and wide input range.

Features of the TPS62021DGQR

           
• Integrated MOSFETs and inductor
           
• Ultra-fast transient response
           
• High switching frequency of 2.0 MHz
           
• Wide 2.25 V to 5.5 V input voltage range
           
• Output voltage adjustable from 0.6 V to 5.2 V
           
• Output current of 1.5 A (2A in dropout mode)
           
• No external compensation components required
           
• Excellent line regulation over input voltage and load conditions
       

Applications of the TPS62021DGQR

The TPS62021DGQR is primarily designed for single-cell Li-ion battery applications with high switching frequency, wide input voltage range, high efficiency, and good line and load regulation. This device can be used in a multitude of applications such as mobile phones, PDAs, digital cameras, and portable media players.

Working Principle of the TPS62021DGQR

The TPS62021DGQR is a DC-DC buck converter with an integrated MOSFET and inductor. It is configured to step down an input voltage to a lower, regulated output voltage. The converter operates in critical conduction mode (CCM) and is enabled using a TTL-compatible control signal. When enabled, current flows through the inductor into the output capacitor, storing energy. When disabled, the stored energy is then discharged into the output, maintaining a constant output voltage.

The device also features integrated MOSFETs which switches the supply voltage to the load. This switching action is controlled by the integrated control circuitry which regulates the output voltage with an accuracy of 4%. The control circuitry also contains internal soft-start circuitry that limits the inrush current to a safe level during startup.

Conclusion

The TPS62021DGQR DC-DC switcher from Texas Instruments is a step-down DC-DC converter with integrated MOSFETs and inductor. With its high efficiency, fast transient response, and wide input range, it is suitable for supplying a digital circuit with up to 2 A from a single Li-ion battery. The device is ideal for a variety of applications, such as mobile phones, PDAs, digital cameras, and portable media players. This device operates in critical conduction mode and its output voltage is regulated with an accuracy of 4%.

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