TC1303B-PA0EMF

Overview

The TC1303B-PA0EMF 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-DFN package. The device operates with an input voltage range of 2.7 V to 5.5 V. The synchronous buck section utilizes a fixed 2 MHz PWM frequency for heavy loads and features automatic transition to PFM mode for improved light-load efficiency. The LDO provides independent shutdown control, and the total quiescent current is typically 65 µA.

Feature Summary

• Integrates a 500 mA synchronous buck regulator and a 300 mA LDO in a compact footprint
• Features automatic transition from PWM to PFM mode to optimize efficiency across load conditions
• Provides independent shutdown controls for both the buck and LDO outputs
• Includes a power-good output signal with a specified delay time

Applications

• Portable consumer electronics requiring multiple regulated voltage rails
• Battery-powered devices utilizing lithium-ion or lithium-polymer cells
• Embedded systems needing efficient step-down conversion alongside stable analog supply
• IoT modules with strict size and power consumption constraints

Procurement Notes

Verify the specific suffix code against official Microchip documentation to confirm output voltage settings and packaging type. Ensure compatibility with the target PCB footprint, specifically the 10-DFN (3x3 mm) dimensions. Confirm RoHS compliance status if required by project specifications. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when a design requires two distinct regulated outputs from a single IC to save board space. The TC1303B is suitable for applications where input voltages vary between 2.7 V and 5.5 V. Consider the 2 MHz switching frequency for smaller external inductor requirements compared to lower-frequency alternatives. Verify that the combined load currents do not exceed the 500 mA buck and 300 mA LDO limits simultaneously.

Part Context

This part belongs to the TC1303 family of dual-output regulators. The 'B' designation typically indicates specific electrical characteristics or revisions within the series. It shares the same core topology as other variants like the TC1303A and TC1303C, differing primarily in output voltage configurations or thermal performance ratings defined by the manufacturer's suffix codes.

Replacement Considerations

Direct substitutes include other TC1303B variants with different output voltage suffixes, such as TC1303B-SA0EMF or TC1303B-PO3EMF, provided the voltage levels match the application requirements. Ensure pin compatibility and thermal performance are equivalent before substitution.