TC1303B-PA0EUNTR

Overview

The TC1303B-PA0EUNTR 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 features a power-good output with a 300 ms delay for system monitoring. Key electrical parameters include an input voltage range of 2.7 V to 5.5 V, with a typical quiescent current of 65 µA. The synchronous buck converter operates at a fixed frequency of 2.0 MHz under heavy loads and transitions automatically to pulse frequency modulation (PFM) mode during light loads to maintain high efficiency. The component is housed in a 10-pin MSOP package.

Feature Summary

• Integrates a 500 mA synchronous buck regulator and a 300 mA LDO with independent shutdown control
• Provides a power-good output signal with a 300 ms delay for system status indication
• Features automatic transition from PWM to PFM mode for optimized efficiency across load conditions
• Includes internal compensation for both outputs to simplify external component requirements

Applications

• Portable consumer electronics requiring multiple voltage rails
• USB-powered devices and peripherals
• Handheld instruments and PDAs
• Embedded systems with space-constrained power architectures

Procurement Notes

Verify the specific suffix 'PA0' against official Microchip documentation to confirm the exact output voltage configuration, as suffixes typically denote fixed or adjustable voltage settings. Ensure the order quantity matches the tape-and-reel packaging specifications provided in the datasheet. Confirm RoHS compliance and lead-free status if required by your manufacturing standards. Cross-reference the part number with the latest revision history to ensure compatibility with existing design files.

Selection Notes

Select this component when a compact solution is needed for generating two distinct regulated voltages from a single input source. The TC1303B is suitable for applications prioritizing low standby power consumption due to its 65 µA quiescent current. Consider the 2.0 MHz switching frequency for minimizing passive component size while managing electromagnetic interference. Verify that the required output voltages align with the available fixed options or the adjustable range supported by the PA0 suffix variant.

Part Context

The TC1303B belongs to Microchip's TC1303/TC1304 series of highly integrated power management ICs designed for portable applications. This family combines switching and linear regulation technologies to address diverse power needs within a small footprint. The series is characterized by its ability to provide efficient power conversion alongside stable linear regulation, making it a common choice for battery-operated devices where space and energy efficiency are critical constraints.

Replacement Considerations

The TC1303A and TC1303C are functionally similar members of the same family, offering identical core regulator specifications but potentially differing in output voltage configurations or package variants. Designers should verify pin-to-pin compatibility and output voltage settings before substituting these parts. Other series such as the TC1313 may offer similar functionality but lack the power-good feature or have different shutdown characteristics.