TC1303B-RD1EMF

Overview

The TC1303B-RD1EMF 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. The synchronous buck converter supports a fixed switching frequency of 2.0 MHz under heavy load conditions and features automatic transition from pulse width modulation (PWM) to pulse frequency modulation (PFM) modes for improved light-load efficiency. The LDO output provides independent shutdown control, while the buck regulator offers adjustable output voltages ranging from 0.8 V to 4.5 V or standard fixed options. Both regulators are internally compensated to minimize external component requirements.

Feature Summary

• Integrates a high-efficiency 500 mA synchronous buck regulator with a 300 mA low-dropout linear regulator in a compact footprint.
• Features automatic mode transition between PWM and PFM operation to optimize efficiency across varying load conditions.
• Provides independent shutdown controls for both the buck and LDO outputs to facilitate system power management.
• Includes a power-good output signal with a defined delay to indicate stable regulation status.

Applications

• Portable consumer electronics requiring efficient multi-rail power distribution
• Battery-powered devices utilizing single-cell lithium-ion or lithium-polymer sources
• Embedded systems needing simultaneous regulated logic and analog supply rails

Procurement Notes

Verify the specific suffix RD1EMF against official Microchip documentation to confirm the exact output voltage configuration and package variant. Ensure compatibility with RoHS and REACH directives as indicated by the LF designation. Cross-reference the datasheet revision date to validate technical specifications prior to integration into production designs.

Selection Notes

Select this component when a design requires two distinct regulated outputs from a single source to save board space. The TC1303B is suitable for applications demanding high efficiency at moderate loads due to its synchronous buck topology. Consider the internal compensation if minimizing external passive components is a priority. Verify that the required output voltage falls within the adjustable range or matches one of the available fixed options.

Part Context

This part belongs to the TC1303A/B/C and TC1304 family of dual-output regulators. These devices are designed to replace separate buck and LDO chips, reducing assembly complexity. The family shares common architectural features but varies in output configurations and thermal performance characteristics depending on the specific model suffix and package type.

Replacement Considerations

Direct replacements include other variants within the TC1303 series such as TC1303B-LF1EMF or TC1303B-PI3EMF, provided the output voltage settings and pinout compatibility match the original design requirements.