Toshiba Semiconductor and Storage TCR2LN18,LSF(SE

Overview

TCR2LN18,LSF(SE) from Toshiba Electronic Devices & Storage Corporation is a fixed-output 1.8 V CMOS low dropout (LDO) regulator with ultra-low quiescent current (2 μA max), 200 mA output capability, and auto-discharge function in an ultra-small SDFN4 package (0.8 mm × 0.8 mm × 0.38 mm). It delivers ±1.0% output accuracy at 1.8 V and features overcurrent protection, making it suitable for power management in space-constrained portable electronics such as cellular phones and wearables.

For engineers reviewing the TCR2LN18,LSF(SE) datasheet, TCR2LN18,LSF(SE) pinout, TCR2LN18,LSF(SE) application, or TCR2LN18,LSF(SE) equivalent, key selection criteria include its 350 mV typical dropout at 150 mA load, compatibility with 0.1 μF ceramic input/output capacitors, on/off control interface, and thermal performance across −40°C to +85°C ambient operation.

Technical Context

The TCR2LN18,LSF(SE) employs a CMOS-based LDO architecture with integrated P-channel pass transistor, enabling low dropout and minimal quiescent current. Its control logic accepts TTL-compatible ON/OFF signals (VCT(OFF) ≤ 0.4 V, VCT(ON) ≥ 1.0 V) and includes internal pull-down between CONTROL and GND.

It operates with input voltages from 1.5 V to 5.5 V and supports stable regulation down to 0.8 V output. The device integrates auto-discharge via a 20 Ω internal discharge switch (RSD), activated when CONTROL = LOW, ensuring rapid output voltage decay during shutdown - critical for system-level power sequencing in battery-powered devices.

Key Specifications

Pinout & Package

TCR2LN18,LSF(SE) is housed in the ultra-compact SDFN4 plastic mold package (0.8 mm × 0.8 mm × 0.38 mm, 0.6 mg typical weight), optimized for high-density board assembly. The exposed center pad must be connected to GND for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R1190J181B-TR-FE and MCP1700T-1802E/TT, the TCR2LN18,LSF(SE) offers the smallest footprint, lowest dropout at 150 mA, and unique auto-discharge - making it optimal for miniaturized, battery-sensitive systems requiring clean power sequencing.

Availability

TCR2LN18,LSF(SE) is available at Aetrix Electronics and suitable for wearable health sensors, Bluetooth LE modules, industrial wireless nodes, portable diagnostic tools, and other applications requiring stable component supply with ultra-low power consumption and miniature packaging.

Supply support for TCR2LN18,LSF(SE) 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, highly integrated semiconductor solutions for consumer, industrial, and automotive markets, with emphasis on power management, logic, and memory technologies.

The TCR2LN series targets ultra-compact, battery-powered applications demanding minimal quiescent current and fast dynamic response - specifically engineered for next-generation wearables, IoT edge nodes, and portable medical electronics.

FAQ

What is the maximum input voltage rating for the TCR2LN18,LSF(SE)?

The TCR2LN18,LSF(SE) has an absolute maximum input voltage (VIN) rating of 6.0 V. However, its recommended operating input voltage range is 1.5 V to 5.5 V under normal conditions. Exceeding 5.5 V may trigger overvoltage stress or reduce long-term reliability, even if within absolute maximum limits. Always refer to the Absolute Maximum Ratings table in the official Toshiba datasheet for TCR2LN18,LSF(SE) when designing for worst-case supply variations.

Does the TCR2LN18,LSF(SE) require external components for stable operation?

Yes - the TCR2LN18,LSF(SE) requires a minimum 0.1 μF ceramic capacitor on both VIN and VOUT pins for stability and transient response. Toshiba specifies that these capacitors must have ESR <10 Ω. No additional compensation components (e.g., resistors or feedback dividers) are needed since TCR2LN18,LSF(SE) is a fixed-output regulator with internal feedback. Placement of capacitors near the IC pins is critical to minimize parasitic inductance.

How does the auto-discharge function operate in the TCR2LN18,LSF(SE)?

When the CONTROL pin is driven LOW (≤0.4 V), the TCR2LN18,LSF(SE) disables the pass transistor and activates an internal 20 Ω discharge switch between VOUT and GND. This rapidly discharges the output capacitor, bringing VOUT to <100 mV within approximately 1 ms (depending on COUT value). This feature prevents back-powering of upstream circuitry and supports clean power sequencing in battery-operated systems using TCR2LN18,LSF(SE).

What is the dropout voltage of the TCR2LN18,LSF(SE) at full rated load?

At 150 mA output current and 25°C junction temperature, the TCR2LN18,LSF(SE) exhibits a typical dropout voltage of 350 mV and a maximum of 600 mV. At 200 mA, the dropout increases slightly but remains within specification. This means the device can maintain 1.8 V regulation with as little as 2.15 V input (1.8 V + 0.35 V) under typical conditions - enabling efficient use of partially discharged batteries in portable applications using TCR2LN18,LSF(SE).

Is the TCR2LN18,LSF(SE) RoHS compliant and lead-free?

Yes - the TCR2LN18,LSF(SE) is RoHS compliant and lead-free, per Toshiba's environmental compliance documentation. The "SE" suffix in the part number denotes lead-free (Pb-free) and halogen-free packaging. It meets EU RoHS Directive 2011/65/EU requirements and is suitable for use in environmentally regulated markets. Full material declarations and test reports are available through Toshiba's official product portal for TCR2LN18,LSF(SE).