TC1303A-ZI0EMF

Overview

The TC1303A-ZI0EMF is a dual-output power management IC manufactured by Microchip Technology, featuring 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 utilizes a 2.0 MHz fixed-frequency PWM control scheme for the buck converter, which transitions automatically to pulse frequency modulation (PFM) at light loads to enhance efficiency. The LDO output is fixed at 2.5 V. Integrated features include independent shutdown controls for both outputs, internal compensation, and a power-good indicator with a 300 ms delay. The component is housed in a compact 10-pin DFN package measuring 3 mm x 3 mm.

Feature Summary

• Dual-output architecture combining a high-efficiency synchronous buck converter with a low-noise LDO
• Automatic transition between PWM and PFM modes to optimize efficiency across varying load conditions
• Independent shutdown functionality allowing separate control of the buck and LDO outputs
• Integrated power-good monitoring signal with a defined delay period for system stability

Applications

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

Procurement Notes

Verify the specific suffix 'ZI0' confirms the 2.5 V fixed LDO output configuration. Ensure the ordering part number matches the required tape-and-reel or tube packaging format. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer before finalizing procurement plans.

Selection Notes

Select this component when a design requires simultaneous switching and linear regulation in a minimal footprint. It is suitable for applications where input voltages vary between 2.7 V and 5.5 V. Consider the 65 µA typical quiescent current for battery life optimization. Verify that the 2.5 V LDO output meets the downstream circuit requirements without additional adjustment resistors.

Part Context

This part belongs to the TC1303 family of dual-output regulators. Variants within this series differ primarily in LDO output voltages and package options. The TC1303A specifically denotes the version with independent shutdown capabilities for both regulators, distinguishing it from other family members that may share shutdown pins or lack this feature entirely.

Replacement Considerations

Direct replacements include other TC1303A variants with different LDO output voltages, such as TC1303A-VD3EMF or TC1303A-HS0EMF, provided the fixed output voltage matches the application needs. Cross-family substitution requires verifying pin compatibility and electrical specifications.