TC1303B-SD0EMF

Overview

The TC1303B-SD0EMF 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 from 2.7 V to 5.5 V, featuring a nominal input of 3.6 V. The synchronous buck converter utilizes current-mode control with pulse width modulation at a fixed frequency of 2.4 MHz maximum. It supports adjustable output voltages between 0.8 V and 4.5 V or standard fixed outputs. The LDO provides independent shutdown capability. The component is housed in a 10-pin DFN package measuring 3 mm x 3 mm with a height of 0.9 mm.

Feature Summary

• Dual-output architecture combining a high-current synchronous buck converter with a dedicated low-dropout linear regulator for efficient power distribution.
• Automatic transition between Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) modes to optimize efficiency across varying load conditions.
• Integrated power-good output signal with a defined delay period to ensure stable system initialization and reliable sequencing.
• Independent shutdown controls allow separate management of the buck and LDO outputs to minimize quiescent current during inactive states.

Applications

• Portable electronic devices requiring multiple regulated voltage rails from a single source
• Battery-powered systems utilizing lithium-ion or lithium-polymer cells
• Embedded applications needing compact power solutions with strict size constraints

Procurement Notes

Verify the specific suffix 'SD0' against official Microchip documentation to confirm the exact output voltage configuration and pinout compatibility before integration. Ensure that the 10-pin DFN package dimensions align with the target PCB footprint and thermal requirements. Confirm RoHS compliance status and lead-free specifications match project standards. Cross-reference the datasheet revision date to validate parameter accuracy. Check for any recent design changes or obsolescence notices associated with this part number.

Selection Notes

Select this component when a combined switching and linear regulation solution is required within a minimal footprint. The internal compensation simplifies design complexity compared to discrete regulators. Consider the total quiescent current specification if battery life is critical. Verify that the input voltage range covers the expected supply variations. Evaluate the thermal performance of the DFN package under maximum load conditions to ensure reliable operation without external heatsinking.

Part Context

This part belongs to the TC1303 family, which includes variants like TC1303A, TC1303C, and TC1304. These devices share similar architectural features but may differ in output currents, fixed voltage options, or package types. The TC1303B specifically denotes the version with the 500 mA buck and 300 mA LDO capabilities. The family is designed for space-constrained applications where board area is limited.

Replacement Considerations

Direct substitutes include other TC1303B variants with compatible pinouts and electrical characteristics. Verify that alternative part numbers offer identical output configurations and package dimensions. Ensure that any replacement maintains the same control mode and switching frequency specifications to preserve system stability and electromagnetic interference profiles.