TC1173-3.0VUATR

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The TC1173-3.0VUATR is a fixed-output CMOS low dropout regulator manufactured by Microchip Technology, providing a regulated 3.0 V output with a maximum current of 300 mA. It operates within an input voltage range of 2.7 V to 6.0 V and features extremely low supply current, typically 50 µA at full load. The device includes a shutdown mode that reduces supply current to 0.05 µA typical. It incorporates over-current and over-temperature protection, an error output flag for out-of-regulation conditions, and a bypass input for ultra-quiet operation. The component is housed in an 8-pin MSOP package.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Integrated power saving shutdown mode significantly reduces supply current when disabled.
• Dedicated open-drain ERROR output signals when the regulator falls out of regulation due to low input voltage or excessive load.
• Optional Bypass input allows connection of a capacitor to minimize internal reference noise for ultra-quiet applications.
• Built-in thermal and current limiting protection safeguards the device under fault conditions.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Battery operated systems requiring extended battery life
• Portable computers and handheld devices
• Medical instruments and portable medical equipment
• Cellular, GSM, and PHS mobile phones
• Linear post-regulators for switching mode power supplies

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific ordering suffix 'TR' indicates tape-and-reel packaging containing 2500 units per reel, distinct from tube-packaged variants. Confirm the 'UA' designation corresponds to the 8-pin MSOP package type. Ensure compatibility with moisture sensitivity levels and reflow soldering profiles specified in the manufacturer's packaging guidelines before procurement.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a fixed 3.0 V rail is required with minimal quiescent current consumption. The inclusion of the ERROR pin makes it suitable for systems needing low-battery detection or processor reset generation without external logic. Verify that the input voltage remains above the dropout threshold plus the minimum operating voltage across the entire load and temperature range.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the TC1173 family of precision CMOS LDO regulators. The family offers various fixed output voltages including 2.5 V, 2.8 V, 3.3 V, and 5.0 V. Variants are available in both 8-pin SOIC and 8-pin MSOP packages. The TC1174 series provides adjustable output versions within the same functional architecture.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes include other TC1173 variants with different output voltages (e.g., TC1173-3.3VUA) if the voltage level can be adapted. For adjustable output requirements, the TC1174 series serves as a functional alternative within the same package and feature set.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

How does the ERROR output function?

The ERROR output is an open-drain signal that goes low when the output voltage drops out of regulation by approximately 5%. This condition can be caused by low input voltage, output current limiting, or thermal limiting.

What is the purpose of the Bypass input?

Connecting a capacitor (typically 470pF) to the Bypass input reduces noise present on the internal reference, which significantly lowers the overall output noise of the regulator for sensitive analog applications.

Can the SHDN pin be left unconnected?

No. If shutdown control is not required, the SHDN pin should be connected directly to the input supply (VIN) to keep the regulator enabled. Leaving it floating may cause unpredictable behavior.