TC1303B-IA0EUN

Overview

The TC1303B-IA0EUN is a dual-output power management IC from Microchip Technology, featuring a 500 mA synchronous buck regulator and a 300 mA low-dropout (LDO) regulator. It operates within an input voltage range of 2.7 V to 5.5 V. The device includes a power-good output with a 300 ms delay and supports independent shutdown for both outputs. Total quiescent current is typically 65 µA. The buck regulator offers over 90% efficiency at heavy loads, utilizes 2.0 MHz fixed-frequency PWM, and transitions automatically to PFM mode. Output voltages are adjustable from 0.8 V to 4.5 V or selected from standard fixed values.

Feature Summary

• Integrates a 500 mA synchronous buck converter and a 300 mA LDO in a single package
• Provides a power-good signal with a 300 ms delay for system monitoring
• Supports independent shutdown control for the buck and LDO outputs
• Features automatic transition between PWM and PFM modes for optimized efficiency

Applications

• Portable battery-powered electronic devices
• Embedded systems requiring multiple regulated voltage rails
• Industrial control modules with space constraints
• Communication equipment power supplies

Procurement Notes

Verify the specific suffix IA0EUN against the official Microchip datasheet to confirm the exact output voltage configuration and pinout compatibility. Ensure that the MSOP-10 package dimensions match the target PCB footprint. Confirm RoHS compliance status and lead-free specifications required for the assembly process. Cross-reference the part number with authorized distributors to ensure authenticity and traceability.

Selection Notes

Select this component when a compact solution is needed for generating two distinct voltage levels from a single input source. The internal compensation simplifies design by reducing external component count. Consider the 2.0 MHz switching frequency for smaller passive components. Verify that the load requirements for both the buck and LDO outputs remain within the specified 500 mA and 300 mA limits respectively during peak operation.

Part Context

This part belongs to the TC1303 family, which combines high-efficiency switching regulation with linear regulation capabilities. The TC1303B variant specifically denotes the version with a power-good output feature. It is designed for applications where board space is limited and multiple voltage domains are required from a single power rail, offering a integrated alternative to discrete regulator solutions.

Replacement Considerations

Compatible substitutes include other variants within the TC1303 series such as TC1303A or TC1303C, provided the output voltage settings and package type are identical. Check for equivalent parts from other manufacturers like MCP1601 or TPS77401 if form-factor changes are acceptable.