TC1303B-ZP0EUN

Overview

The TC1303B-ZP0EUN 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 MSOP-10 package. The device operates with an input voltage range of 2.7 V to 5.5 V, featuring a typical quiescent current of 65 µA. The buck converter supports adjustable output voltages from 0.8 V to 4.5 V or standard fixed outputs, utilizing a 2.0 MHz fixed-frequency PWM control scheme that transitions to PFM mode for improved light-load efficiency. The LDO provides a fixed 1.8 V output. Both regulators are internally compensated and include independent shutdown controls.

Feature Summary

• Dual-output architecture combining a high-efficiency synchronous buck regulator with a dedicated low-noise LDO in a compact footprint.
• Integrated power-good monitoring signal with a configurable delay to indicate valid output regulation status.
• Automatic transition between Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) modes to optimize efficiency across varying load conditions.
• Independent shutdown functionality allows separate control of the buck and LDO outputs to minimize standby power consumption.

Applications

• Portable consumer electronics requiring multiple regulated voltage rails from a single source
• Battery-powered devices needing extended runtime through efficient power management
• Embedded systems utilizing microcontrollers with distinct core and I/O voltage requirements

Procurement Notes

Verify the specific suffix ZP0EUN corresponds to the MSOP-10 package and 1.8 V fixed LDO output configuration. Confirm RoHS compliance and lead-free status as indicated in official datasheets. Ensure ordering quantities align with tube packaging specifications rather than reel formats. Cross-reference the manufacturer part number directly with Microchip Technology documentation to avoid substitution errors with similar family members.

Selection Notes

Select this component when a design requires two isolated regulated outputs from a single input rail within space-constrained applications. The TC1303B-ZP0EUN is suitable for systems prioritizing board area reduction over discrete solutions. Consider the 2.0 MHz switching frequency for smaller external passive components. Verify that the 300 mA LDO current capability meets the load requirements for sensitive analog or logic circuits.

Part Context

This part belongs to the TC1303 series of dual-output regulators, which also includes variants like the TC1303A and TC1303C. These devices share a common functional block diagram but differ in output configurations, packages, and specific electrical characteristics. The TC1303B variant specifically offers the combination of an adjustable buck and a fixed LDO, distinguishing it from other series members with different output combinations.

Replacement Considerations

Direct replacements within the same family include TC1303B-YP3EUN and TC1303B-SN0EUNTR, provided pin compatibility and output voltage settings match the application requirements. Verify package dimensions and thermal characteristics when substituting between DFN and MSOP footprints.

FAQ

What is the maximum switching frequency of the buck regulator in the TC1303B-ZP0EUN?

The synchronous buck regulator operates at a fixed frequency of 2.0 MHz under heavy load conditions.

Does the TC1303B-ZP0EUN support independent shutdown of its outputs?

Yes, the device features independent shutdown pins for both the buck regulator and the LDO, allowing separate control of each output stage.

What type of output does the LDO section provide in this specific part number?

The TC1303B-ZP0EUN provides a fixed 1.8 V output from its low-dropout regulator section.