TC1303C-ZA0EUN

Overview

The TC1303C-ZA0EUN is a dual-output power management IC from Microchip Technology, 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. The device provides a typical total quiescent current of 65 µA and includes a power-good output with a 300 ms delay. The 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 mode that transitions automatically to PFM for efficiency. It is housed in a 10-pin MSOP package.

Feature Summary

• Integrates a high-efficiency synchronous buck regulator with a separate low-dropout linear regulator in a single compact package.
• Features automatic transition between Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) modes to optimize efficiency across varying load conditions.
• Includes an independent shutdown capability for both the buck and LDO outputs to facilitate system power management.
• Provides a power-good signal output with a defined delay to indicate stable regulation status.

Applications

• Portable battery-powered consumer electronics requiring multiple regulated voltage rails
• Embedded systems needing efficient step-down conversion combined with low-noise analog supply
• Industrial control modules operating from single-cell lithium-ion or alkaline battery sources

Procurement Notes

Verify the specific suffix ZA0EUN against the official Microchip datasheet to confirm the exact output voltage configuration and packaging details. Ensure compatibility with the target PCB footprint for the MSOP-10 package. Confirm RoHS compliance status through the manufacturer's certification documents prior to integration into production assemblies.

Selection Notes

Select this component when a design requires both switching efficiency for main loads and LDO precision for sensitive circuits within a limited board area. Consider the 2.0 MHz switching frequency for smaller external inductor and capacitor sizes compared to lower-frequency alternatives. Evaluate thermal performance requirements based on the expected load current and ambient temperature conditions.

Part Context

This part belongs to the TC1303 family of dual-output regulators, which also includes variants like TC1303A, TC1303B, and TC1304. These devices share the same core architecture but may differ in output voltage settings, package types, or specific feature sets such as shutdown pin availability. The family is designed for space-constrained applications requiring integrated power management solutions.

Replacement Considerations

Direct substitutes include other TC1303 series variants such as TC1303C-SG3EUN or TC1303C-XR0EMF, depending on the required package type (MSOP vs DFN) and specific output voltage configuration. Verify pin-to-pin compatibility and electrical specifications before substitution.