TC1303B-ZG0EMF

Overview

The TC1303B-ZG0EMF is a dual-output power management IC from Microchip Technology, integrating a 500 mA synchronous buck regulator and a 300 mA low-dropout (LDO) linear regulator. It operates within an input voltage range of 2.7 V to 5.5 V. The device features a total quiescent current of 65 µA typical and includes a power-good output with a 300 ms delay. The buck converter supports adjustable outputs from 0.8 V to 4.5 V or standard fixed voltages, utilizing a 2.0 MHz fixed-frequency PWM mode for heavy loads and automatic transition to PFM mode for light loads.

Feature Summary

• Integrates a high-efficiency synchronous buck regulator and a low-noise LDO in a single compact package
• Provides independent shutdown control for both the buck and LDO outputs to optimize system power consumption
• Features automatic transition between PWM and PFM modes to maintain efficiency across varying load conditions
• Includes a delayed power-good signal to ensure stable sequencing during startup and shutdown events

Applications

• Portable consumer electronics requiring efficient multi-rail power distribution
• Battery-powered devices needing extended operational life through low quiescent current
• Embedded systems requiring clean power for sensitive analog or RF components via the LDO
• Industrial control modules operating on single-cell lithium-ion battery supplies

Procurement Notes

Verify the specific suffix ZG0 against the official Microchip datasheet to confirm the exact output voltage configuration and package variant. Ensure compatibility with your PCB footprint, as the DFN-10 package dimensions are critical for thermal performance. Cross-reference the ordering part number with authorized distributors to avoid counterfeit components. Confirm RoHS compliance status if required by your manufacturing standards.

Selection Notes

Select this component when space constraints require combining switching and linear regulation functions. It is suitable for applications demanding high efficiency at moderate loads while maintaining low noise for downstream circuitry. Consider the 2.0 MHz switching frequency for smaller external passive component sizes compared to lower-frequency alternatives. Evaluate the thermal requirements of the DFN-10 package based on your expected load currents and ambient temperature conditions.

Part Context

This part belongs to the TC1303 family of dual-output regulators, which also includes variants like TC1303A, TC1303C, and TC1304. These devices share similar architectural features but may differ in output current ratings, fixed voltage options, or package types. The TC1303B specifically denotes the version with 500 mA buck and 300 mA LDO capabilities, designed for general-purpose power management in portable electronics.

Replacement Considerations

Direct substitutes include other members of the TC1303 family such as TC1303A or TC1303C, provided the output voltage and current specifications match the design requirements. Verify pin-to-pin compatibility and thermal characteristics before substitution. Alternative manufacturers may offer similar dual-regulator ICs, but functional equivalence must be confirmed through detailed electrical parameter comparison.