TC1303A-ZA0EUN

Overview

The TC1303A-ZA0EUN is a dual-output power management IC featuring a 500 mA synchronous buck regulator and a 300 mA low-dropout (LDO) linear regulator. It operates within an input voltage range of 2.7 V to 5.5 V, with a typical quiescent current of 65 µA. The buck converter supports a fixed switching frequency of 2.0 MHz and offers adjustable output voltages from 0.8 V to 4.5 V or standard fixed options. The device includes independent shutdown controls for both outputs and provides a power-good signal with a 300 ms delay. It is housed in a 10-lead MSOP package.

Feature Summary

• Integrates a high-efficiency synchronous buck regulator and a low-noise LDO in a single compact package
• Features automatic transition between PWM and PFM modes to optimize efficiency across varying load conditions
• Provides independent shutdown control for the buck and LDO outputs to manage system power states
• Includes a power-good output function with a configurable delay for reliable processor reset sequencing

Applications

• Portable consumer electronics requiring efficient multi-rail power distribution
• Battery-powered devices utilizing single-cell lithium-ion or lithium-polymer sources
• Embedded systems needing simultaneous regulated rails for logic and analog circuits
• Industrial control modules operating within wide temperature ranges

Procurement Notes

Verify the specific suffix ZA0EUN against the manufacturer's official datasheet to confirm the exact output voltage configuration and package type. Ensure compatibility with your board's thermal requirements and footprint specifications. Cross-reference the ordering part number with Microchip Technology documentation to avoid discrepancies in pinouts or electrical characteristics before finalizing procurement.

Selection Notes

Select this component when designing systems that require both high-current switching regulation and clean linear power for sensitive analog loads. The integrated power-good feature simplifies startup sequencing for microprocessors. Consider the 2.0 MHz switching frequency for minimizing external passive component size while maintaining acceptable noise levels. Verify that the required output voltage aligns with the available fixed settings or adjustability range specified in the datasheet.

Part Context

This part belongs to the TC1303 family of dual-output regulators manufactured by Microchip Technology. The family variants differ primarily in the power-good monitoring configuration and output voltage options. The TC1303A specifically monitors the buck output for the power-good signal. These devices are designed to replace discrete regulator solutions, reducing board space and assembly complexity in portable applications.

Replacement Considerations

Direct replacements include other members of the TC1303 family such as TC1303B, TC1303C, and TC1304, depending on the required power-good monitoring scope. Ensure that any substitute matches the 10-lead MSOP package dimensions and pinout configuration to maintain mechanical compatibility.