TC1303B-IA0EUNTR

Overview

The TC1303B-IA0EUNTR 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 MSOP-10 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 synchronous buck converter supports adjustable output voltages from 0.8 V to 4.5 V or standard fixed outputs, utilizing a 2.0 MHz fixed-frequency PWM mode that transitions automatically to PFM for improved light-load efficiency. The LDO provides independent shutdown control and includes a power-good output with a 300 ms delay.

Feature Summary

• Integrates a 500 mA synchronous buck regulator and a 300 mA LDO in a compact footprint
• Features automatic transition between PWM and PFM modes for optimized efficiency across load conditions
• Includes a power-good indicator with a 300 ms delay for system monitoring
• Supports independent shutdown controls for both the buck and LDO outputs

Applications

• Portable consumer electronics requiring multiple voltage rails
• USB-powered peripheral devices
• Battery-operated handheld instruments
• Embedded systems with strict space constraints

Procurement Notes

Verify the specific suffix IA0 against official Microchip documentation to confirm the exact output voltage configuration, as suffixes determine fixed or adjustable parameters. Ensure the MSOP-10 package variant matches the target PCB footprint. Confirm RoHS compliance status and lead-free specifications prior to ordering. Cross-reference the full part number with authorized distributors to ensure authenticity and availability.

Selection Notes

Select this component when a design requires both high-efficiency switching regulation and low-noise linear regulation on a single chip. The TC1303B is suitable for applications needing independent control of two voltage rails with minimal external components. Consider the 2.0 MHz switching frequency for smaller passive component sizes. Verify that the required output voltage falls within the adjustable range or matches one of the available fixed options.

Part Context

The TC1303B belongs to the TC1303/TC1304 series of power management ICs introduced by Microchip Technology. This family combines synchronous buck and LDO technologies to provide comprehensive power solutions for portable devices. The series is characterized by high integration, low quiescent current, and internal compensation, reducing the need for external feedback networks and simplifying board layout.

Replacement Considerations

Check for TC1303A or TC1303C variants if different output configurations are needed. The MCP1602 may serve as a replacement if only the buck regulator function is required without the LDO. Verify pin compatibility and thermal performance before substituting.