Toshiba Semiconductor and Storage TCR2LN285,LF(SE

Overview

TCR2LN285,LF(SE) from Toshiba Electronic Devices & Storage Corporation is a 2.85 V fixed-output, 200 mA CMOS low dropout (LDO) voltage regulator with ultra-low quiescent current (2 μA max), on/off control input, and auto-discharge function-designed for power management in space-constrained portable electronics such as cellular phones and wearables.

For engineers reviewing the TCR2LN285,LF(SE) datasheet, TCR2LN285,LF(SE) pinout, TCR2LN285,LF(SE) application, or TCR2LN285,LF(SE) equivalent, key selection criteria include its SDFN4 package (0.8 mm × 0.8 mm), ±1.0% output accuracy at 2.85 V, 250 mV dropout at 150 mA, ceramic capacitor compatibility (0.1 μF input/output), and overcurrent protection.

Technical Context

The TCR2LN285,LF(SE) employs a CMOS-based LDO architecture with internal P-channel MOSFET pass element, enabling low dropout and minimal bias current across −40°C to +85°C. Its control logic accepts TTL-compatible ON/OFF signals (VCT(OFF) ≤ 0.4 V, VCT(ON) ≥ 1.0 V) and integrates a pull-down resistor between CONTROL and GND.

It features auto-discharge via an internal 20 Ω discharge switch activated when CONTROL = LOW, ensuring rapid VOUT decay during shutdown. Output stability is maintained with 0.1 μF ceramic capacitors on both VIN and VOUT, eliminating need for bulk electrolytics.

Key Specifications

Pinout & Package

SDFN4 package: ultra-small 4-pin plastic mold with exposed thermal pad (center electrode, recommended to connect to GND). Dimensions: 0.8 mm × 0.8 mm × 0.38 mm; weight: 0.6 mg (typ.).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R1172L285B-TR-FE and MCP1703T-285I/MB, the TCR2LN285,LF(SE) offers the smallest footprint, lowest dropout, lowest quiescent current, and integrated auto-discharge-making it optimal for miniaturized, battery-sensitive designs where active power sequencing is critical.

Availability

TCR2LN285,LF(SE) is available at Aetrix Electronics and suitable for smart wearables, Bluetooth LE modules, portable medical sensors, and IoT edge nodes requiring stable component supply, long-lifecycle availability, and high-density board assembly.

Supply support for TCR2LN285,LF(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, miniaturized semiconductor solutions for consumer, industrial, and automotive markets, with emphasis on power management and analog ICs.

The TCR2LN series targets ultra-low-power portable electronics, delivering CMOS LDO regulators optimized for battery longevity, minimal PCB area, and seamless integration with ceramic capacitors-specifically addressing design constraints in cellular phones and wearables.

FAQ

What is the maximum input voltage rating for the TCR2LN285,LF(SE)?

The TCR2LN285,LF(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 per electrical characteristics testing conditions. Exceeding 5.5 V may compromise long-term reliability even if within absolute maximum limits, so system design should maintain VIN ≤ 5.5 V during normal operation. The TCR2LN285,LF(SE) is not rated for automotive 12 V or industrial 24 V rails without pre-regulation.

Does the TCR2LN285,LF(SE) require external components for stable operation?

No external compensation components are required. The TCR2LN285,LF(SE) is internally compensated and stable with only 0.1 μF ceramic capacitors on both VIN and VOUT pins, as verified in Toshiba's application notes and electrical characteristics testing. Larger capacitance values are acceptable but unnecessary for stability. The TCR2LN285,LF(SE) does not require ESR-tuned output capacitors, simplifying BOM and layout.

How does the auto-discharge function operate in the TCR2LN285,LF(SE)?

When the CONTROL pin is driven LOW (≤0.4 V), the TCR2LN285,LF(SE) disables regulation and activates an internal 20 Ω discharge path between VOUT and GND. This rapidly discharges the output capacitor, reducing VOUT to near-zero within microseconds-critical for preventing backfeed into powered-down circuitry. The TCR2LN285,LF(SE) does not discharge when CONTROL is HIGH or open; the pull-down resistor ensures safe default-OFF behavior.

What is the thermal performance of the TCR2LN285,LF(SE) in its SDFN4 package?

The TCR2LN285,LF(SE) in SDFN4 has a specified power dissipation rating of 300 mW when mounted on a standard FR4 board (40 mm × 40 mm, 1.6 mm thick, 50% copper coverage). Its thermal resistance (θJA) is approximately 417°C/W under those conditions. To sustain 200 mA at 2.85 V output with 3.3 V input (150 mW dissipation), board-level thermal design-especially GND pad connection to inner layers-is essential. The TCR2LN285,LF(SE) junction temperature must remain ≤150°C for reliable operation.

Is the TCR2LN285,LF(SE) RoHS compliant and halogen-free?

Yes, the TCR2LN285,LF(SE) complies with EU RoHS Directive 2011/65/EU and is halogen-free per Toshiba's environmental specifications. The "LF" suffix in the part number explicitly denotes lead-free and RoHS-compliant packaging. Full compliance documentation-including test reports and substance declarations-is available through Toshiba's official product page and authorized distributors. The TCR2LN285,LF(SE) is suitable for consumer and medical applications requiring strict environmental conformance.