TPS54388QRTERQ1 Integrated Circuits (ICs)

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TPS54388QRTERQ1 Application Field and Working Principle

The TPS54388QRTERQ1 is a monolithic synchronous step-down DC/DC regulator with an output current up to 8A in a very small package, designed to provide a high current and tight load regulation. This device is engineered to feature fast transient response, low shutdown current, excellent line and load regulation, and wide input voltage range. The output voltage is internally adjustable from 0.8V to 4.4V and the minimum voltage dropped is 0.4V.

Features

• Input voltage range (VIN) 2.3V to 18V
• Adaptive On-Time control with DCM and CCM
• Internal compensation and Soft-Start
• Selectable current limit
• Fast current limit response
• Power Good, enable, reset and power-down signals
• 4mm x 4mm 20-pin WQFN Package
• 100% test of line and load regulation
• Robust 8 A continuous current, 10A peak current capability
• 230°C junction temperature rating

Applications

• CPU and GPU core supply in notebook and PC
• AMOLED displays
• Automotive A/V systems and car amusement
• 3G/4G communication
• Ultrabook laptop chargers
• Video gaming consoles
• Industrial high-end embedded systems
• Portable communications

Working Principle of the TPS54388QRTERQ1

The TPS54388QRTERQ1 operates in either DCM (Discontinuous Conduction Mode) or CCM (Continuous Conduction Mode) depending on the output load. In DCM, the inductor current completely discharges during each switching cycle. In CCM, there is always a short period of current flow in the inductor. The advantage of the DCM operation is the reduction of the current ripple and its associated output voltage disturbances. The majority of the energy is transferred to the output in a single large burst of current. In CCM operation, the inductor current flows in two stages, resulting in a smaller current ripple than DCM and improved efficiency over the entire load range.

The TPS54388QRTERQ1 uses an Adaptive On-Time control concept to guarantee fast transient response and an external voltage reference is used to regulate the output voltage. The device also features power-down and thermal shutdown modes, soft-start circuitry and selectable current limit.

To preserve the high performance and tight load regulation, the switch node is regulated using voltage sense pins. When the voltage at the switch node falls to 0.4V, a pulse is issued to the feedback pin to reduce the output voltage and increase the switching frequency. This allows the TPS54388QRTERQ1 to reach very low output voltages and maintain tight load regulation with very low output voltages.

Conclusion

The TPS54388QRTERQ1 is a highly efficient and high current synchronous step-down DC/DC regulator that can provide a very tight load regulation. It is ideal for applications such as CPUs and GPUs, AMOLED displays, 3G/4G communication, ultrabook laptop chargers, and portable communications. It features an Adaptive On-Time control concept with DCM and CCM operation to provide fast transient response, low shutdown current and excellent line and load regulation.

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