TC1303C-ZA0EUNTR

Overview

The TC1303C-ZA0EUNTR is a dual-output power management IC from Microchip Technology, integrating a 500 mA synchronous buck regulator and a 300 mA low-dropout (LDO) regulator. It operates within an input voltage range of 2.7 V to 5.5 V. The device features a typical total quiescent current of 65 µA and includes a power-good output with a 300 ms delay. The synchronous buck converter supports adjustable outputs from 0.8 V to 4.5 V or standard fixed voltages, utilizing a 2.0 MHz fixed-frequency PWM control scheme that transitions to PFM mode for efficiency. The LDO provides fixed 3.3 V or 800 mV outputs. It is housed in a DFN-10 package.

Feature Summary

• Integrates a 500 mA synchronous buck regulator and a 300 mA LDO in a single compact package
• Features automatic transition between PWM and PFM modes to optimize efficiency across load conditions
• Includes a power-good indicator signal with a specified 300 ms delay for system monitoring
• Supports independent shutdown control for both the buck and LDO outputs

Applications

• Portable consumer electronics requiring efficient multi-rail power distribution
• Battery-powered devices needing extended operational life through low quiescent current
• Embedded systems requiring stable voltage regulation for logic and peripheral supplies

Procurement Notes

Verify the specific suffix ZA0EUNTR against the official Microchip datasheet to confirm the exact output voltage configuration and package type. Ensure compatibility with the target PCB footprint for the DFN-10 package. Confirm that the required input and output voltage ranges align with the system design specifications before finalizing procurement.

Selection Notes

Select this component when a combined switching and linear regulation solution is required in a space-constrained environment. It is suitable for applications demanding high efficiency under heavy loads via the buck converter and clean power via the LDO. Consider the 2.0 MHz switching frequency for smaller external passive components compared to lower-frequency alternatives.

Part Context

This part belongs to the TC1303 family of dual-output regulators from Microchip Technology. The family is designed to provide flexible power management solutions for portable applications. Variations within the family typically differ by output voltage settings, package options, and thermal characteristics, while maintaining the core architecture of a synchronous buck paired with an LDO.

Replacement Considerations

Consult the Microchip TC1303 datasheet for direct pin-compatible alternatives within the same family, such as other suffixes offering different fixed output voltages. Cross-referencing with similar dual-output PMICs from other manufacturers requires careful verification of pinouts, electrical parameters, and thermal performance.