Toshiba Semiconductor and Storage TCR3UM30A,LF

Overview

TCR3UM30A,LF from Toshiba Electronic Devices & Storage Corporation is a CMOS low-dropout linear regulator with fixed 3.0 V output, ultra-low 0.38 μA quiescent current (typ.), 196 mV dropout at 300 mA, and integrated on/off control, thermal shutdown, overcurrent protection, and auto-discharge - designed for power management in space-constrained portable electronics.

For engineers reviewing the TCR3UM30A,LF datasheet, TCR3UM30A,LF pinout, TCR3UM30A,LF application, or TCR3UM30A,LF equivalent, key selection criteria include its DFN4/DFN4E 1.0 mm × 1.0 mm package, ±1.0% output accuracy (at ≥1.8 V), 70 dB ripple rejection at 1 kHz, fast load transient response (±36–51 mV), and compatibility with 1 μF ceramic input/output capacitors.

Technical Context

The TCR3UM30A,LF implements a CMOS-based LDO architecture with internal PMOS pass transistor, enabling low dropout and ultra-low bias current. Its control logic includes pull-down between CONTROL and GND, defined ON/OFF voltage thresholds (VCT(ON) = 1.0–5.5 V, VCT(OFF) = 0–0.4 V), and auto-discharge via 7 Ω discharge resistance.

Thermal protection activates at 158°C with 28°C hysteresis, and overcurrent limiting triggers at 400–545 mA depending on junction temperature. The device operates across −40°C to +85°C and supports input voltages from 1.5 V to 5.5 V, making it suitable for single-cell Li-ion, Li-polymer, and multi-cell alkaline/battery-backed systems.

Key Specifications

Pinout & Package

TCR3UM30A,LF is housed in an ultra-small DFN4/DFN4E plastic mold package (1.0 mm × 1.0 mm, max height 0.60 mm, weight 1.3 mg), optimized for high-density PCB layouts in wearable and IoT devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCR3UM30A,LF, the XC6210B302MR-G offers identical footprint but trades 54 mV higher dropout and 2.6× higher IQ, while the BD3572EFJ-ME2 provides comparable dropout at the cost of 8× larger area and no auto-discharge - making TCR3UM30A,LF optimal for ultra-compact, battery-critical designs requiring rapid shutdown isolation.

Availability

TCR3UM30A,LF is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE sensor nodes, smart earbud charging cases, and industrial wireless nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TCR3UM30A,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 discrete semiconductors, power devices, and analog ICs for automotive, industrial, and consumer applications.

The TCR3UM series was developed specifically for ultra-low-power portable electronics, emphasizing minimal quiescent current, miniature packaging, and fast transient performance in battery-constrained systems.

FAQ

What is the guaranteed output voltage accuracy of TCR3UM30A,LF?

The TCR3UM30A,LF guarantees ±1.0% output voltage accuracy for VOUT ≥ 1.8 V, as specified in the Electrical Characteristics table (page 5). At its nominal 3.0 V output, this corresponds to a tolerance band of 2.97 V to 3.03 V under standard test conditions (IOUT = 50 mA, Tj = 25°C). This accuracy eliminates the need for post-production calibration in most portable applications.

Does TCR3UM30A,LF support ceramic capacitors, and what values are required?

Yes, TCR3UM30A,LF is fully compatible with 1.0 μF ceramic capacitors on both input (VIN) and output (VOUT) pins, as confirmed in the Applications section and Electrical Characteristics notes. The device's internal compensation is optimized for low-ESR ceramics, and Toshiba recommends selecting capacitors with ESR under 10 Ω to ensure stability across temperature and aging.

How does the auto-discharge function operate in TCR3UM30A,LF?

When the CONTROL pin is pulled low (≤0.4 V), TCR3UM30A,LF disables regulation and activates an internal 7 Ω discharge path between VOUT and GND. This rapidly discharges the output capacitor, clearing VOUT to near-zero volts within milliseconds - preventing backfeed into upstream circuitry and enabling safe hot-plug operation in modular systems.

What is the maximum allowable input voltage for TCR3UM30A,LF?

The absolute maximum input voltage for TCR3UM30A,LF is 6.0 V, per the Absolute Maximum Ratings table (page 2). However, the recommended operating range is 1.5 V to 5.5 V (page 3). Exceeding 5.5 V may trigger overvoltage stress even if within absolute limits, and sustained operation above this range risks reliability degradation per Toshiba's derating guidelines.

Can TCR3UM30A,LF be used with a 1.5 V input supply to deliver 3.0 V output?

No - TCR3UM30A,LF cannot regulate 3.0 V output from a 1.5 V input because the required headroom exceeds the device's capability. With a 196 mV dropout at full load, minimum input is 3.196 V. The datasheet specifies VIN ≥ 1.5 V only for lower-output variants (e.g., 0.8–1.5 V); for TCR3UM30A,LF, valid VIN starts at 3.196 V and extends to 5.5 V per operating ranges.