TC1303B-ZA0EMF

Overview

The TC1303B-ZA0EMF 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, with 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 mode that transitions to PFM for light loads. 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-pin DFN-10 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 capabilities for the buck and LDO outputs to manage system power states
• Includes an internal power-good monitor with a defined delay to ensure stable startup sequencing

Applications

• Portable consumer electronics requiring efficient multi-rail power distribution
• Embedded systems needing simultaneous regulated voltage rails for logic and analog circuits
• Battery-powered devices where extended standby time and high conversion efficiency are critical
• Industrial control modules requiring robust power regulation within a small footprint

Procurement Notes

Verify the specific suffix ZA0 corresponds to the required fixed output voltage configuration before ordering. Confirm that the DFN-10 package dimensions align with the target PCB layout constraints. Ensure compatibility with RoHS and lead-free manufacturing standards if required by the end product specifications. Cross-reference the datasheet for thermal performance requirements under maximum load conditions.

Selection Notes

Select this component when a combined solution for switching and linear regulation is preferred to save board space. The adjustable buck output allows flexibility for various core voltage requirements. Consider the 2.0 MHz switching frequency for smaller external passive components compared to lower frequency alternatives. Evaluate the total quiescent current impact on battery life if the system remains active in standby mode.

Part Context

This part belongs to the TC1303 family, which combines a synchronous buck converter with an LDO. The 'B' variant typically denotes specific electrical characteristics or pin configurations within the series. The ZA0 suffix indicates a fixed output voltage option, distinguishing it from adjustable variants like LF1 or LF3. This family is designed for applications demanding high efficiency and low noise in a minimal form factor.

Replacement Considerations

Direct replacements include other TC1303B variants with different output voltage suffixes if the voltage requirement changes. For similar functionality, consider the TC1304 series for higher current ratings or the TC1303A/C series for alternative feature sets. Verify pin-to-pin compatibility and thermal characteristics when substituting with parts from other manufacturers.