TC1303B-ZI0EUN

Overview

The TC1303B-ZI0EUN is a dual-output power management integrated circuit manufactured by Microchip Technology. It integrates a 500 mA synchronous buck regulator and a 300 mA low-dropout (LDO) linear regulator within a single 10-lead MSOP package. The device operates with an input voltage range of 2.7 V to 5.5 V. The synchronous buck converter utilizes a fixed 2 MHz switching frequency and supports adjustable output voltages from 0.8 V to 4.5 V, as well as standard fixed outputs including 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V. Total quiescent current is typically 65 µA.

Feature Summary

• Integrates a high-efficiency synchronous buck regulator and a separate LDO for independent power rail generation
• Features automatic transition between Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) modes to optimize efficiency across load conditions
• Includes a power-good output signal with a configurable delay to indicate stable regulation status
• Provides independent shutdown control pins for both the buck and LDO outputs to minimize standby power consumption

Applications

• Portable consumer electronics requiring multiple regulated voltage rails
• Battery-powered devices needing efficient step-down conversion and clean analog supply
• Embedded systems utilizing microcontrollers with distinct core and I/O voltage requirements
• Industrial control modules operating from single-cell lithium-ion or alkaline battery sources

Procurement Notes

Verify the specific suffix 'ZI0EUN' corresponds to the MSOP-10 package and the desired output voltage configuration. Confirm RoHS compliance status and lead-free material declarations match project requirements. Ensure ordering documentation explicitly references the Microchip Technology part number to avoid substitution errors with similar family members that may have different pinouts or electrical characteristics.

Selection Notes

Select this component when space-constrained designs require two isolated regulators in a minimal footprint. The internal compensation simplifies external component selection compared to discrete solutions. Consider the 2 MHz switching frequency for smaller passive components but verify electromagnetic interference constraints. Evaluate thermal performance in the MSOP-10 package against expected load currents and ambient temperature conditions.

Part Context

This part belongs to the TC1303/TC1304 series of dual-output regulators. The 'B' variant typically denotes specific electrical tolerances or feature sets within the family. It serves as a compact alternative to using separate buck and LDO chips, reducing board area and assembly complexity. The series is designed for applications prioritizing power density and extended battery life in portable equipment.

Replacement Considerations

Direct replacements include other TC1303B variants with compatible packages such as TC1303B-PK0EUNTR or TC1303B-YP3EUN, provided the output voltage settings and pin configurations are identical. Verify that substitute parts maintain the same MSOP-10 footprint and thermal dissipation capabilities before implementation.