TC1303B-DF0EMF

Overview

The TC1303B-DF0EMF 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 package. The device operates with an input voltage range of 2.7 V to 5.5 V. The synchronous buck converter utilizes current-mode control with a fixed switching frequency of 2.0 MHz under heavy loads, featuring automatic transition to pulse frequency modulation for improved light-load efficiency. The LDO provides independent shutdown capability. Both regulators are internally compensated to minimize external component count.

Feature Summary

• Dual-output architecture combining a high-efficiency synchronous buck converter with a dedicated low-dropout linear regulator in a compact footprint.
• Integrated power-good output signal that indicates when regulated voltages have reached their specified thresholds after a defined delay period.
• Automatic mode transition between pulse width modulation and pulse frequency modulation to optimize efficiency across varying load conditions.
• Independent shutdown controls allow separate disabling of the buck and LDO outputs to conserve power in standby modes.

Applications

• Portable consumer electronics requiring multiple stable voltage rails from a single source
• Battery-powered devices utilizing lithium-ion or lithium-polymer cells
• Embedded systems needing efficient step-down conversion alongside noise-sensitive analog supply regulation

Procurement Notes

Verify the specific suffix code against official Microchip documentation to confirm pin compatibility and thermal characteristics. Ensure the selected variant matches the required output voltage configuration and package type for your design. Cross-reference the manufacturer's latest datasheet to validate RoHS compliance and environmental ratings before finalizing procurement specifications.

Selection Notes

Select this component when space-constrained designs require both switching efficiency and low-noise linear regulation. The internal compensation simplifies layout compared to discrete solutions. Consider the maximum input voltage limits and thermal dissipation requirements of the DFN package relative to the expected load currents and ambient operating temperatures.

Part Context

This part belongs to the TC1303 family of dual-output regulators designed for portable applications. The series includes variants with different output voltage configurations and package options. The TC1303B specifically denotes a version with adjustable or fixed output settings compatible with standard logic levels, offering a balance of performance and cost for mainstream embedded systems.

Replacement Considerations

Consult Microchip's official cross-reference tools for verified substitutes. Ensure any replacement maintains the same pinout, voltage ratings, and thermal performance to avoid redesigning the PCB layout or power tree.

FAQ

How does the device manage efficiency at light loads?

The synchronous buck regulator automatically transitions from pulse width modulation to pulse frequency modulation as the load decreases, reducing switching losses and improving overall efficiency during light-load operation.

What is the purpose of the Power-Good output?

The Power-Good output provides a digital signal indicating that both the buck and LDO outputs have stabilized within their specified tolerances, typically after a 300 ms delay, allowing system controllers to safely initialize.