Microchip Technology TC2185-2.7VCTTR

Overview

TC2185-2.7VCTTR from Microchip Technology is a 150 mA, fixed-output CMOS low-dropout (LDO) voltage regulator in a 5-pin SOT-23A package, delivering ±0.4% output voltage accuracy at 2.7 V, 140 mV typical dropout at full load, and 80 µA maximum supply current. It features shutdown control, reference bypass input for ultra-low-noise operation, and overcurrent/overtemperature protection - deployed in battery-powered medical instruments and portable computing systems.

For engineers reviewing the TC2185-2.7VCTTR datasheet, TC2185-2.7VCTTR pinout, TC2185-2.7VCTTR application, or TC2185-2.7VCTTR equivalent, key selection criteria include its 150 mA output capability, 2.7 V fixed output with ±0.4% tolerance, 140 mV dropout at 150 mA, 60 µs wake-up response from shutdown, and compatibility with 1 µF ceramic output capacitance.

Technical Context

The TC2185-2.7VCTTR implements a CMOS-based LDO architecture with a precision bandgap reference and internal error amplifier, enabling stable regulation across –40°C to +125°C. Its reference bypass (BYPASS) pin accepts a 470 pF–0.01 µF capacitor to reduce output noise to 200 nV/√Hz and improve PSRR to 55 dB below 1 kHz.

Shutdown is controlled via a CMOS-compatible SHDN input with VIH = 60% VIN and VIL = 15% VIN; asserting low reduces supply current to 0.5 µA max and forces VOUT to 0 V. Thermal shutdown activates at ~160°C, with automatic recovery at ~150°C.

Key Specifications

Pinout & Package

TC2185-2.7VCTTR is housed in a space-saving 5-pin SOT-23A (EIAJ SC-74A) package with 220°C/W junction-to-air thermal resistance on standard FR4 PCBs. Pin 1 (VIN) is marked by a beveled corner or dot; device orientation follows EIAJ tape-and-reel standard (7-inch reel, 3000 units).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2702E/TO and TPS7A0527PDBVR, TC2185-2.7VCTTR uniquely balances 150 mA drive, 60 µs wake-up, and bypass-enabled low-noise performance in the smallest 5-pin SOT-23A footprint - making it optimal for space-constrained, noise-sensitive, and dynamically powered systems.

Availability

TC2185-2.7VCTTR is available at Aetrix Electronics and suitable for battery-operated medical instruments, portable computing subsystems, and GSM/PHS phone baseband supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TC2185-2.7VCTTR 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs, with global manufacturing and quality certifications including ISO 9001 and AEC-Q200.

The TC2014/TC2015/TC2185 family was designed as CMOS-based LDO upgrades to bipolar regulators like LP2980 - targeting ultra-low-quiescent-current, high-accuracy, and noise-sensitive applications in portable and medical electronics.

FAQ

What is the minimum input voltage required for TC2185-2.7VCTTR to maintain regulation?

The TC2185-2.7VCTTR requires VIN ≥ 2.7 V per absolute rating, but actual minimum depends on load: VIN must exceed VOUT + dropout voltage. At 150 mA, typical dropout is 140 mV, so VIN ≥ 2.84 V is needed. The datasheet specifies VIN ≥ VR + VDROPOUT and VIN ≥ 2.7 V - both conditions must be satisfied. TC2185-2.7VCTTR achieves this with its 140 mV dropout at full load, enabling use with aging or partially discharged batteries.

Can TC2185-2.7VCTTR operate without the bypass capacitor?

Yes, TC2185-2.7VCTTR functions without the bypass capacitor connected to the BYPASS pin. However, omitting it increases output noise from 200 nV/√Hz to higher levels and reduces PSRR from 55 dB to ~40 dB at 1 kHz. The bypass cap is optional for non-noise-critical applications but strongly recommended for ADC references, RF biasing, or audio circuits. TC2185-2.7VCTTR remains stable and fully functional without it.

What is the thermal shutdown behavior of TC2185-2.7VCTTR?

TC2185-2.7VCTTR incorporates thermal shutdown that activates at approximately 160°C junction temperature, disabling output and reducing supply current. It automatically recovers when die temperature cools to ~150°C. This hysteresis prevents oscillation near trip point. During shutdown, VOUT falls to 0 V and IIN drops to ≤0.5 µA. TC2185-2.7VCTTR resumes normal regulation once thermal stress subsides - no external reset is needed.

Is TC2185-2.7VCTTR compatible with ceramic output capacitors?

Yes, TC2185-2.7VCTTR is explicitly designed for stability with ≥1 µF ceramic output capacitors having ESR between 0.01 Ω and 5 Ω (for VOUT ≥ 2.5 V). X5R and X7R dielectrics are recommended for stable capacitance over temperature. Unlike older LDOs, TC2185-2.7VCTTR does not require tantalum or electrolytic caps - enabling smaller, more reliable, and lower-ESR solutions. TC2185-2.7VCTTR maintains phase margin and transient response across its full operating range with ceramic caps.

How does the shutdown pin (SHDN) interface with common microcontrollers?

The SHDN pin of TC2185-2.7VCTTR is CMOS-compatible: VIH = 60% VIN (min) and VIL = 15% VIN (max), allowing direct connection to 1.8 V, 3.3 V, or 5 V GPIO outputs without level shifting. When pulled high, regulation is enabled; when pulled low, output disables and supply current drops to ≤0.5 µA. If unused, SHDN should be tied to VIN. TC2185-2.7VCTTR supports precise power sequencing in multi-rail systems via this logic-controlled enable function.