TC1303B-PF0EUNTR

Overview

The TC1303B-PF0EUNTR 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 synchronous buck converter supports a fixed switching frequency of 2.0 MHz and offers adjustable output voltages from 0.8 V to 4.5 V, alongside standard fixed options. The LDO provides a separate regulated output with independent shutdown control. Both regulators are internally compensated for stability. The component includes a Power-Good output signal with a 300 ms delay to indicate valid regulation status. It is housed in a 10-pin MSOP-10 plastic package.

Feature Summary

• Integrates a 500 mA synchronous buck regulator and a 300 mA LDO in a single chip
• Provides independent shutdown control for both the buck and LDO outputs
• Features automatic transition between PWM and PFM modes for optimized efficiency
• Includes a Power-Good output indicator with a 300 ms delay

Applications

• Portable consumer electronics requiring multiple voltage rails
• Battery-powered devices needing efficient power management
• Systems utilizing USB or single-cell battery inputs
• Embedded applications with space-constrained PCB layouts

Procurement Notes

Verify the specific suffix PF0EUNTR against official Microchip documentation to confirm the exact output voltage configuration and package type. Ensure compatibility with required thermal dissipation standards for the MSOP-10 package. Confirm RoHS compliance status as per the latest datasheet revision. Cross-reference the part number with authorized distributors to avoid counterfeit components. Validate that the selected variant meets the specific voltage and current requirements of the target application design.

Selection Notes

Select this component when a compact solution is needed for generating two distinct voltage levels from a single input source. Consider the TC1303B series if internal compensation simplifies the design process compared to externally compensated alternatives. Evaluate the 2.0 MHz switching frequency against EMI constraints and inductor size requirements. Assess the total quiescent current impact on standby power consumption for battery-operated systems. Verify that the available output voltage options align with the load requirements without excessive dropout voltage.

Part Context

The TC1303B belongs to Microchip's TC1303/TC1304 family of highly integrated power management ICs designed for portable applications. This series combines switching and linear regulation technologies to maximize efficiency while minimizing board space. The family is characterized by its small footprint, internal compensation, and flexible output configurations. It targets markets such as mobile phones, PDAs, and other handheld devices where power efficiency and size are critical design parameters.

Replacement Considerations

Direct replacements include other variants within the TC1303B family with different output voltage suffixes, such as TC1303B-PK0EUNTR or TC1303B-SN0EUNTR, provided the electrical specifications match the design requirements. Ensure pinout compatibility and thermal characteristics remain consistent when substituting parts within the same package type.