TPS51511RHLR

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TPS51511RHLR Application Field and Working Principle

The TPS51511RHLR, part of Texas Instruments’ ‘Step-Down’ family of DC/DC converters, is a widely used switched-mode power supply (SMPS) integrated circuit (IC) offering a 3A constant-current-mode of operation. Power management integrated circuits (PMICs) like the TPS51511RHLR allow electronic and embedded devices to efficiently and accurately manage the power requirements of their system. The TPS51511RHLR is typically used for linear post-regulation, DC/DC conversion and battery charging applications.

Classification as PMIC - Voltage Regulators - Linear + Switching

The TPS51511RHLR is classified as a PMIC (Power Management Integrated Circuit), Voltage Regulator and as either a Linear or a Switching power supply (SMPS). It is a Linear + Switching PMIC device as it offers both Linear and Switching power conversion in one IC.

General Features of the TPS51511RHLR

• Integrated 3A Step-Down DC/DC converter
• Telecom grade input voltage range of 20V to 75V
• Input voltage under-voltage lockout level of 9V
• Up to 94% efficiency
• CSP-5 package with ultra-small footprint
• Thermal shutdown and short-circuit protection

Applications of the TPS51511RHLR

The TPS51511RHLR delivers a step-down conversion of incoming voltage and offers both linear and switching power conversion, making it suitable for a range of applications in both the linear and switching realms. It offers a wide input voltage range and a high efficiency of up to 94%. The device offers excellent transient response, allowing it to precisely regulate voltage during load step and line transient conditions.

The TPS51511RHLR is highly suitable for applications such as post-regulation, DC/DC conversion and battery charging, including:

• Notebook and Ultrabook PCs
• High-end embedded systems
• Instrumentation applications

Working Principle of TPS51511RHLR

The TPS51511RHLR is a constant-current-mode DC/DC converter that is based on the peak current-mode control (PCMC) topology. This particular device offers a wide input voltage range (20V-75V) and an adjustable output voltage (2V-10V) while being able to provide a wide range of well-regulated output current (3A).

The TPS51511RHLR uses a pulse-width modulation (PWM) signal to control the duty cycle of the output switching power supply and regulates the output voltage. Internal output-voltage comparator circuitry and a feed-forward signal of the output voltage are used to regulate the output voltage and provide line and load voltage compensation. The device is operating in constant-current-mode with a current-sensing resistor and an internal current loop.

The TPS51511RHLR is an integrated 3A step-down DC/DC converter and is built using the advanced BiCMOS process. It offers a package size of only 2.2mm x 2mm with a reduced height of only 0.8mm, making it highly suitable for miniaturized embedded applications.

Conclusion

The TPS51511RHLR is a power management integrated circuit (PMIC) and is classified as a voltage regulator and as either a linear or a switching power supply (SMPS). It is a highly versatile device that offers a wide input voltage range, adjustable output voltage and a current-mode control topology. It is suitable for a range of post-regulation, DC/DC conversion and battery charging applications, including high-end embedded systems and instrumentation.

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