TC1303B-ZI0EMFTR

Overview

The TC1303B-ZI0EMFTR 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 and features a typical total quiescent current of 65 µA. The synchronous buck converter supports a fixed switching frequency of 2.0 MHz under heavy load conditions and includes automatic transition from pulse width modulation (PWM) to pulse frequency modulation (PFM) modes for improved light-load efficiency. The LDO output provides a power-good signal with a 300 ms delay. Both regulators are internally compensated, and the buck output voltage is adjustable between 0.8 V and 4.5 V or set to standard fixed values.

Feature Summary

• Integrates a 500 mA synchronous buck regulator and a 300 mA LDO in a compact DFN-10 package
• Features automatic PWM to PFM mode transition for optimized efficiency across varying load conditions
• Provides independent shutdown control for both the buck and LDO outputs
• Includes a power-good output indicator with a 300 ms delay for system monitoring

Applications

• Portable consumer electronics requiring efficient multi-rail power distribution
• Battery-powered devices needing extended operational life through low quiescent current
• Embedded systems utilizing microcontrollers with multiple voltage domain requirements
• Industrial control modules operating within standard 3.3 V or 5 V supply architectures

Procurement Notes

Verify the specific suffix code against official Microchip documentation to confirm pin compatibility and thermal characteristics. Ensure that the ordering information matches the required output voltage configuration and package variant. Cross-reference the manufacturer's latest datasheet to validate environmental compliance and operating temperature ranges before finalizing procurement specifications.

Selection Notes

Select this component when a design requires two regulated outputs from a single source with minimal external component count. The internal compensation simplifies layout compared to externally compensated alternatives. Consider the 2.0 MHz switching frequency for balancing electromagnetic interference and passive component size. Verify that the 500 mA buck current rating meets the peak load demands of the primary rail.

Part Context

This part belongs to the TC1303 family of dual-output regulators designed for space-constrained applications. The series combines switching and linear regulation technologies to address different noise and efficiency requirements within a single system. The TC1303B variant specifically offers the integrated power-good feature and defined current limits suitable for general-purpose portable electronics.

Replacement Considerations

Consult Microchip's official substitution guide for verified equivalents. Direct replacements may include other members of the TC1303 family or compatible parts from the MCP160x series if pinouts and electrical parameters align with the application requirements.