TC1303A-ZS0EUN

Overview

The TC1303A-ZS0EUN is a dual-output power management IC manufactured by 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 device utilizes a 2.0 MHz fixed-frequency PWM control scheme for the buck converter, which transitions automatically to PFM mode at light loads. It includes a Power-Good output with a 300 ms delay and independent shutdown controls for both outputs.

Feature Summary

• Dual-output architecture combining a high-efficiency synchronous buck regulator with a low-noise LDO in a single compact package.
• Integrated Power-Good signal with programmable delay to monitor output status and facilitate processor reset sequencing.
• Automatic transition between PWM and PFM modes to optimize efficiency across varying load conditions while maintaining low output noise.

Applications

• Portable consumer electronics requiring efficient multi-rail power distribution
• Embedded systems utilizing microcontrollers or processors needing stable logic and analog supply rails
• Battery-powered devices prioritizing extended operational life through low quiescent current consumption

Procurement Notes

Verify the specific suffix code against official Microchip documentation to confirm pinout compatibility and output configuration. Ensure the selected variant matches the required thermal performance and packaging type for your PCB layout. Cross-reference the datasheet revision history to validate feature availability and electrical characteristics before finalizing component selection.

Selection Notes

Select this component when a compact solution is needed for generating two distinct regulated voltages from a single source. Consider the internal compensation and fixed switching frequency to simplify external component selection. Evaluate the thermal requirements of the MSOP-10 package based on the expected load currents and ambient operating temperatures.

Part Context

This part belongs to the TC1303 family of dual-output regulators, designed to replace discrete regulator solutions. It integrates advanced power management features typically found in larger PMICs into a small footprint. The family supports various output voltage configurations and monitoring options to suit diverse application needs.

Replacement Considerations

Check for direct substitutes within the TC1303 series such as TC1303B or TC1303C if different Power-Good monitoring functions are required. Verify pin-to-pin compatibility with other manufacturers' dual-output buck-LDO combinations if sourcing alternatives.

FAQ

What is the maximum switching frequency of the buck regulator?

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

Does the device support independent control of the outputs?

Yes, the TC1303A allows for independent shutdown of both the buck and LDO outputs via dedicated control pins.