TC1303B-ZI0EUNTR

Overview

The TC1303B-ZI0EUNTR 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, featuring a typical quiescent current of 65 µA. The buck converter supports a fixed switching frequency of 2.0 MHz and includes automatic transition from PWM to 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 feature independent shutdown controls.

Feature Summary

• Dual-output architecture combining a high-efficiency synchronous buck converter with a low-noise LDO
• Automatic transition between Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) modes to optimize efficiency across load conditions
• Integrated Power-Good output indicator with configurable delay for system monitoring
• Independent shutdown control pins allowing separate management of the buck and LDO outputs

Applications

• Portable battery-powered consumer electronics requiring multiple voltage rails
• Embedded systems utilizing microcontrollers or application processors
• Industrial control modules with strict power budget constraints
• Communication equipment needing low-noise analog power supplies

Procurement Notes

Verify the specific suffix code against official Microchip documentation to confirm the exact output voltage configuration and package variant. Ensure compatibility with RoHS standards and lead-free requirements as specified in the datasheet. Confirm moisture sensitivity level handling procedures during assembly to prevent damage. Cross-reference the ordering part number with the manufacturer's latest release notes to ensure availability and correct revision status.

Selection Notes

Select this component when a compact solution is required for generating two distinct regulated voltages from a single input source. The internal compensation simplifies design by reducing external component count compared to non-internal compensated alternatives. Consider the 2.0 MHz switching frequency for balancing electromagnetic interference and passive component size. Evaluate the total quiescent current against standby power requirements to ensure compliance with system energy efficiency targets.

Part Context

This part belongs to the TC1303 family of dual-output regulators, which also includes variants like the TC1303A and TC1303C. These devices share similar functional architectures but may differ in specific electrical characteristics, temperature ranges, or output configurations. The family is designed for applications requiring space-constrained power management solutions with high integration levels.

Replacement Considerations

Direct substitutes include other parts within the TC1303 series such as TC1303A or TC1303C, provided their specific electrical parameters match the design requirements. Verify pin-to-pin compatibility and output voltage settings before substitution. Alternative manufacturers' dual-output regulators may require schematic and layout modifications due to differences in control loops or pin definitions.