Microchip Technology TC2055-1.8VCTTR

Overview

TC2055-1.8VCTTR from Microchip Technology is a 100 mA, 1.8 V fixed-output CMOS low-dropout (LDO) regulator in a 5-pin SOT-23A package, featuring ±0.4% output voltage accuracy, 90 mV typical dropout at full load, and integrated shutdown control with open-drain ERROR flag - deployed in battery-powered medical instruments and portable computing systems.

For engineers reviewing the TC2055-1.8VCTTR datasheet, TC2055-1.8VCTTR pinout, TC2055-1.8VCTTR application, or TC2055-1.8VCTTR equivalent, key selection criteria include its 55 µA quiescent current, fast 60 µs wake-up from shutdown, thermal/overcurrent protection, and compatibility with 1 µF ceramic output capacitors for space-constrained designs.

Technical Context

The TC2055-1.8VCTTR implements a CMOS-based LDO architecture optimized for battery-operated systems, delivering stable 1.8 V regulation across –40°C to +125°C while maintaining 55 µA supply current independent of load. Its ERROR output asserts low when VOUT drops >5% below nominal, enabling use as a low-battery detector or processor reset generator.

It operates with input voltages from 2.7 V to 6.0 V, supports shutdown via logic-level SHDN input (VIH ≥ 60% VIN), and achieves 50 dB PSRR at ≤100 kHz. The device remains stable with 1 µF ceramic output capacitance and incorporates thermal shutdown at ~160°C and foldback overcurrent protection.

Key Specifications

Pinout & Package

TC2055-1.8VCTTR is housed in a 5-pin SOT-23A (EIAJ SC-74A) surface-mount package with 255°C/W junction-to-air thermal resistance, designed for high-density PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700-1802E/TO and TPS78018QDDCRQ1, the TC2055-1.8VCTTR uniquely balances 100 mA capability, diagnostic ERROR signaling, SOT-23A compactness, and 55 µA IQ - making it optimal for portable industrial and medical devices needing reliability, size efficiency, and battery health awareness without automotive certification overhead.

Availability

TC2055-1.8VCTTR is available at Aetrix Electronics and suitable for battery-operated medical instruments, portable computing systems, and cellular communication modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TC2055-1.8VCTTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The TC2055-1.8VCTTR belongs to Microchip's precision CMOS LDO family designed specifically for battery-operated systems demanding ultra-low quiescent current, high accuracy, and integrated fault monitoring - replacing legacy bipolar regulators without layout changes.

FAQ

What is the maximum input voltage rating for TC2055-1.8VCTTR?

The absolute maximum input voltage for TC2055-1.8VCTTR is 6.5 V, but the recommended operating range is 2.7 V to 6.0 V. Exceeding 6.5 V risks permanent damage. For reliable 1.8 V output, minimum VIN must satisfy both 2.7 V and (1.8 V + dropout); at 100 mA, this requires VIN ≥ 1.89 V, well within the operational window.

Does TC2055-1.8VCTTR require an external resistor to use the ERROR pin?

Yes - the ERROR pin is open-drain and requires an external pull-up resistor (e.g., 100 kΩ to VIN or VOUT) to generate a valid logic-high signal. Pull-up to VOUT simplifies reset timing when used with a series capacitor; pull-up to VIN improves noise immunity. The ERROR sink current is self-limited to ~18 mA, eliminating risk of overdrive.

Can TC2055-1.8VCTTR operate with a 1 µF ceramic output capacitor?

Yes - TC2055-1.8VCTTR is explicitly characterized and guaranteed stable with a 1 µF ceramic output capacitor (ESR 0.05–5 Ω). This eliminates need for larger tantalum or electrolytic capacitors, reducing board area and cost while improving reliability and temperature performance compared to alternatives requiring ≥4.7 µF.

What is the thermal shutdown behavior of TC2055-1.8VCTTR?

TC2055-1.8VCTTR activates thermal shutdown at approximately 160°C die temperature and remains off until the junction cools to ~150°C. During shutdown, VOUT falls to 0 V, ERROR goes high-impedance, and supply current drops to 0.05 µA. This hysteresis prevents cycling near the trip point and protects downstream circuitry during sustained overload or poor heatsinking.

Is TC2055-1.8VCTTR pin-compatible with older bipolar LDOs?

Yes - TC2055-1.8VCTTR uses the standard 5-pin SOT-23A footprint and pinout (VIN, GND, SHDN, ERROR, VOUT), enabling direct replacement of legacy bipolar regulators like the LP2985 or MIC5205 without PCB modification. Functionally, it upgrades performance with lower IQ, tighter accuracy, and added diagnostics while maintaining identical mechanical integration.