Toshiba Semiconductor and Storage TCR2LF21,LM(CT

Overview

TCR2LF21,LM(CT) from Toshiba is a 2.1 V fixed-output, 200 mA CMOS low-dropout (LDO) voltage regulator in SOT-25 (SMV) package, featuring ultra-low 2 μA max quiescent current, 320 mV typical dropout at 150 mA, ±1.0% output accuracy (for VOUT ≥ 1.8 V), overcurrent protection, and auto-discharge functionality-designed for power management in space-constrained portable electronics such as cellular handsets and wearables.

For engineers reviewing the TCR2LF21,LM(CT) datasheet, TCR2LF21,LM(CT) pinout, TCR2LF21,LM(CT) application, or TCR2LF21,LM(CT) equivalent, key selection criteria include its 2.1 V output stability across −40°C to +85°C, compatibility with 0.1 μF ceramic input/output capacitors, on/off control interface, and thermal performance under 150 mA load in ultra-small SMV footprint.

Technical Context

The TCR2LF21,LM(CT) implements a CMOS-based LDO architecture with integrated P-channel pass transistor, enabling low dropout and minimal bias current. Its control pin supports active-high enable logic (VCT(ON) = 1.0–5.5 V) and includes internal pull-down to GND when unconnected.

It delivers regulated 2.1 V output with line regulation of ≤15 mV and load regulation of ≤30 mV, while maintaining stable operation with 0.1 μF ceramic capacitors on both VIN and VOUT. The device incorporates thermal shutdown and foldback overcurrent protection, and features an auto-discharge path (RSD = 20 Ω max) to rapidly discharge output capacitance upon shutdown.

Key Specifications

Pinout & Package

TCR2LF21,LM(CT) uses the SMV (SOT-25 / SC-74A) package: 2.8 mm × 2.9 mm × 1.1 mm, 5-pin surface-mount, moisture sensitivity level (MSL) 1, tape-and-reel packaging (CT).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCS2121B,LM(CT), the TCR2LF21,LM(CT) trades 5 dB PSRR for broader distributor availability and lower unit cost; versus MCP1700-2102E/TO, it delivers 3× lower quiescent current, 2× better accuracy, and 30% smaller footprint-making it optimal for high-density portable designs.

Availability

TCR2LF21,LM(CT) is available at Aetrix Electronics and suitable for cellular handset power management, wearable sensor subsystems, and portable medical patch devices requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for TCR2LF21,LM(CT) 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures high-efficiency semiconductor solutions for consumer, industrial, and automotive markets, with emphasis on miniaturization, energy efficiency, and reliability.

The TCR2LF series belongs to Toshiba's ultra-low-IQ CMOS LDO product line, engineered specifically for battery-powered portable electronics where extended operating life and ultra-compact board space are primary design constraints.

FAQ

What is the maximum input voltage rating for TCR2LF21,LM(CT)?

The absolute maximum input voltage for TCR2LF21,LM(CT) is 6.0 V, but the recommended operating range is 1.5 V to 5.5 V per electrical characteristics testing conditions. Exceeding 5.5 V may compromise long-term reliability even if within absolute maximum ratings, and operation above 6.0 V risks permanent damage. Always maintain VIN ≤ 5.5 V in normal use to ensure compliance with specified dropout, accuracy, and thermal performance of the TCR2LF21,LM(CT).

Does TCR2LF21,LM(CT) require an external pull-down resistor on the CONTROL pin?

No, TCR2LF21,LM(CT) includes an internal pull-down connection between CONTROL and GND, ensuring the device remains disabled when the CONTROL pin is left unconnected or driven low. This eliminates the need for an external resistor in most MCU interface configurations. However, if the host system drives CONTROL actively, ensure voltage levels meet VCT(OFF) ≤ 0.4 V (for disable) and VCT(ON) ≥ 1.0 V (for enable) as specified in the TCR2LF21,LM(CT) datasheet.

Can TCR2LF21,LM(CT) operate stably with only 0.1 μF output capacitance?

Yes, TCR2LF21,LM(CT) is explicitly designed and characterized for stable operation with a 0.1 μF ceramic output capacitor (X5R/X7R, ESR < 10 Ω). This is confirmed in the Electrical Characteristics table and Application Note section. Using larger capacitors is permissible but unnecessary for stability-0.1 μF meets all phase margin and transient response requirements defined for the TCR2LF21,LM(CT) across its full operating range.

What is the dropout voltage of TCR2LF21,LM(CT) at 200 mA load?

The dropout voltage of TCR2LF21,LM(CT) is not characterized at 200 mA in the official datasheet; specifications are provided up to 150 mA (320 mV typ. at 2.1 V output). At 200 mA, dropout increases beyond the rated 320 mV-actual value depends on junction temperature and input conditions. For guaranteed performance, design with IOUT ≤ 150 mA or verify thermal derating using the PD–Ta curves for SMV package in the TCR2LF21,LM(CT) datasheet.

Is TCR2LF21,LM(CT) pin-compatible with other TCR2LF series variants?

Yes, all TCR2LF series regulators-including TCR2LF21,LM(CT)-share identical SMV (SOT-25) pinout, package dimensions, and terminal functions (VOUT, CONTROL, GND, NC, VIN). This allows direct substitution across output voltages (0.8 V to 3.6 V) without PCB layout changes, provided the application's voltage, current, and accuracy requirements align with the selected variant's specifications.