TC1303B-AG0EUN

Overview

The TC1303B-AG0EUN 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) regulator within a single DFN-10 package measuring 3 x 3 mm with a height of 0.9 mm. The device operates on an input voltage range from 2.7 V to 5.5 V, with a nominal rating of 3.6 V. The synchronous buck section supports a fixed switching frequency of 2.0 MHz under heavy load conditions and features automatic transition between pulse width modulation and pulse frequency modulation modes. The LDO output provides a typical dropout voltage of 137 mV at 200 mA. Both regulators are internally compensated and include independent shutdown controls.

Feature Summary

• Dual-output architecture combining a 500 mA synchronous buck converter and a 300 mA LDO regulator
• Automatic transition between PWM and PFM modes for optimized efficiency across varying load conditions
• Integrated power-good output signal with a specified delay time for system monitoring
• Independent shutdown control pins allowing separate management of the buck and LDO outputs

Applications

• Portable consumer electronics requiring efficient multi-rail power distribution
• Battery-powered devices utilizing lithium-ion or lithium-polymer cells
• Embedded systems needing simultaneous high-current and low-noise supply rails
• Industrial control modules operating within standard voltage ranges

Procurement Notes

Verify the specific suffix AG0 against official Microchip documentation to confirm the exact output voltage configuration, as ordering codes determine functional parameters. Ensure the procurement channel sources genuine components to maintain reliability standards. Cross-reference the package type and pinout with the latest datasheet to prevent integration errors during PCB layout and assembly processes.

Selection Notes

Select this component when a design requires both high-efficiency step-down conversion and a clean, stable auxiliary rail from a single source. The internal compensation simplifies external component selection compared to non-compensated alternatives. Consider the thermal performance of the DFN-10 package relative to the expected current loads and ambient operating temperatures to ensure compliance with junction temperature limits.

Part Context

This part belongs to the TC1303 family, which includes variants like TC1303A, TC1303C, and TC1304. These devices share common architectural features such as the dual-regulator topology and power-good signaling. The TC1303B variant specifically denotes the electrical characteristics and output configurations associated with this model line within Microchip's power management portfolio.

Replacement Considerations

Direct substitutes within the same family include TC1303A and TC1303C models, provided their specific output voltage settings match the design requirements. Verify that alternative packages, such as MSOP-10, offer compatible pinouts if physical footprint changes are permissible in the target application.