Toshiba Semiconductor and Storage TCR2LN21,LF

Overview

TCR2LN21,LF from Toshiba Electronic Devices & Storage Corporation is a fixed-output 2.1 V CMOS low dropout (LDO) voltage regulator with on/off control input, ultra-low 2 μA quiescent current at zero load, 250 mV dropout at 150 mA output, and overcurrent protection - designed for power management in space-constrained portable electronics.

For engineers reviewing the TCR2LN21,LF datasheet, TCR2LN21,LF pinout, TCR2LN21,LF application, or TCR2LN21,LF equivalent, this device supports high-density board assembly in battery-powered systems requiring stable low-voltage bias, fast control response, and ceramic capacitor compatibility (0.1 μF input/output).

Technical Context

The TCR2LN21,LF implements a CMOS-based LDO architecture with internal P-channel pass transistor, enabling low dropout and minimal quiescent current across −40°C to +85°C. Its CONTROL pin accepts TTL-compatible logic levels (ON threshold ≥1.0 V, OFF threshold ≤0.4 V) and includes integrated pull-down to GND.

It features auto-discharge functionality via internal 20 Ω discharge switch between VOUT and GND when disabled, and maintains ±1.0% output accuracy for VOUT ≥1.8 V. Input voltage range is 1.5 V to 5.5 V, supporting single-cell Li-ion and multi-cell alkaline/battery sources.

Key Specifications

Pinout & Package

TCR2LN21,LF is housed in the ultra-small SDFN4 package (0.8 mm × 0.8 mm × 0.38 mm, 0.6 mg typical weight), with exposed center thermal pad intended for GND connection or left floating per design requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2112K-2.1TRG1 and MCP1700T-2102E/TT, the TCR2LN21,LF delivers superior battery lifetime via 2 μA IQ and eliminates external discharge components through its integrated 20 Ω switch - critical for space- and energy-constrained edge nodes.

Availability

TCR2LN21,LF is available at Aetrix Electronics and suitable for wearable health sensors, Bluetooth Low Energy modules, smart card readers, and industrial wireless sensor nodes requiring stable component supply, consistent parametric performance, and long-lifecycle availability.

Supply support for TCR2LN21,LF 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-reliability semiconductor solutions for consumer, industrial, and automotive markets, with emphasis on power efficiency and miniaturization.

The TCR2LN series targets ultra-compact, battery-sensitive applications - delivering CMOS LDO regulation with sub-μA quiescent current, ceramic capacitor compatibility, and integrated control/discharge functions in sub-1 mm² packages.

FAQ

What is the output voltage tolerance of TCR2LN21,LF over temperature?

The TCR2LN21,LF guarantees ±1.0% output voltage accuracy for VOUT ≥1.8 V across the full operating temperature range of −40°C to +85°C. This specification is confirmed in the Electrical Characteristics table (Page 4), where min/max deviation is bounded under all test conditions including temperature sweep and load variation - ensuring reliable 2.1 V bias for precision analog circuits without external calibration.

Does TCR2LN21,LF require an external pull-up resistor on the CONTROL pin?

No, TCR2LN21,LF does not require an external pull-up resistor on the CONTROL pin. It integrates a 0.1 μA internal pull-down to GND, ensuring a defined OFF state when the pin is left unconnected or driven low. The CONTROL pin is TTL-compatible: ≥1.0 V turns the regulator ON, and ≤0.4 V disables it - simplifying interface with standard GPIOs without additional biasing components.

Can TCR2LN21,LF operate with input voltage below 2.1 V?

Yes, TCR2LN21,LF can operate with input voltage as low as 1.5 V, but regulation is only maintained while VIN ≥ VOUT + VDO. At 150 mA load, VDO is 300 mV (typ.), so minimum functional VIN is ~2.4 V. Below that, output drops linearly with input - making it suitable for brown-out detection or pre-regulation stages, but not for regulated 2.1 V output below ~2.4 V input.

What is the thermal performance of TCR2LN21,LF in the SDFN4 package?

TCR2LN21,LF in SDFN4 achieves 300 mW power dissipation rating when mounted on a standard FR4 board (40 mm × 40 mm, 1.6 mm thick, 50% copper coverage). Its 0.38 mm profile and exposed center pad (to be connected to GND) enable efficient heat transfer. Junction-to-ambient thermal resistance (θJA) is ~417°C/W - meaning at 150 mA and 2.5 V input, junction temperature rise is ~15°C above ambient, well within the 150°C absolute maximum limit.

Is TCR2LN21,LF RoHS compliant and lead-free?

Yes, TCR2LN21,LF is RoHS compliant and lead-free. Toshiba confirms compliance with EU Directive 2011/65/EU (RoHS 2) and related amendments. The ",LF" suffix explicitly denotes lead-free plating and halogen-free molding compound. Full material declarations and test reports are available via Toshiba's official product page and authorized distributor portals (e.g., Digi-Key, Mouser) under part number TCR2LN21,LF.