TC1303B-ZS0EUN

Overview

The TC1303B-ZS0EUN 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. The device operates within an input voltage range of 2.7 V to 5.5 V, with a nominal rating of 3.6 V. It utilizes current-mode control with pulse width modulation technology. The synchronous buck section supports a maximum switching frequency of 2400 kHz and includes automatic transition between PWM and PFM modes for optimized efficiency across load conditions. The package is a 10-pin MSOP.

Feature Summary

• Dual-output architecture combining a high-current synchronous buck converter with a dedicated LDO for simultaneous power rail generation.
• Integrated power-good output signal that monitors the buck regulator status, providing system health indication with a defined delay.
• Automatic mode transition capability allowing seamless switching between fixed-frequency PWM at heavy loads and PFM at light loads to maximize efficiency.
• Independent shutdown functionality enabling separate control of the buck and LDO outputs to manage power consumption.

Applications

• Portable consumer electronics requiring multiple regulated voltage rails
• Embedded systems utilizing processor reset sequencing via power-good signals
• Battery-powered devices needing efficient step-down conversion and stable linear regulation
• Industrial control modules operating within wide temperature ranges

Procurement Notes

Verify the specific suffix code on the component marking against the official Microchip datasheet to confirm the exact output voltage configuration and package variant. Ensure the ordering part number matches the required thermal performance and pin assignment specifications for your PCB layout. Cross-reference the manufacturer's latest documentation to validate compliance with current environmental standards and RoHS directives before finalizing procurement.

Selection Notes

Select this component when a design requires both high-efficiency switching regulation and clean linear power supply capabilities in a compact footprint. The integrated power-good feature simplifies system startup sequences and fault monitoring without external logic. Consider the independent shutdown pins if dynamic power management of specific rails is necessary. Verify that the required output voltages align with the available factory-set options or adjustable configurations provided by the specific suffix.

Part Context

This part belongs to the TC1303 family of dual-output regulators designed for space-constrained applications. Unlike single-output variants, this series integrates both switching and linear technologies on one die. The 'B' designation typically indicates specific monitoring functions, such as power-good signaling for the buck output only, distinguishing it from other family members that may monitor different combinations of outputs.

FAQ

What does the Power-Good output monitor on the TC1303B?

On the TC1303B model, the Power-Good output specifically monitors the status of the synchronous buck regulator output voltage.

How does the device handle light load conditions?

The regulator automatically transitions from Pulse Width Modulation (PWM) mode to Pulse Frequency Modulation (PFM) mode under light loads to improve efficiency.