STMicroelectronics LDCL015M33R

Overview

LDCL015M33R from STMicroelectronics is a 150 mA, 3.3 V fixed-output ultra-low-dropout linear regulator in SOT23-5L package, featuring capless operation (no input/output capacitors required), 50 mV dropout at 100 mA, ±2% output voltage accuracy at 25°C, and −40°C to 125°C operating temperature range. It delivers stable low-noise power for space-constrained battery-powered systems such as mobile phones and portable medical devices.

For engineers reviewing the LDCL015M33R datasheet, LDCL015M33R pinout, LDCL015M33R application, or LDCL015M33R equivalent, key selection criteria include capless stability, sub-100 mV dropout under load, enable-controlled shutdown (<1 µA quiescent current), and thermal/short-circuit protection in a 5-pin SOT23 footprint.

Technical Context

The LDCL015M33R employs a robust op-amp-based LDO architecture with sufficient phase margin to ensure stability with or without output capacitance-enabling true capless operation down to 0 nF C_OUT. Its internal reference is trimmed to 0.8 V (for adjustable variants) and achieves ±3% output tolerance over full temperature range.

Control logic includes an active-high EN pin with 1.0 V logic-high threshold and 0.3 V logic-low threshold; shutdown reduces total current to <1 µA. Protection circuitry integrates constant-current short-circuit limiting (220 mA typ.) and thermal shutdown at 170°C with 20°C hysteresis.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 1.45 mm height, 2.95 mm × 1.60 mm body, 0.95 mm pitch; RoHS-compliant ECOPACK®2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, capless LDO applications.

Compared with XC6206P332MR and MIC5205-3.3YM5, the LDCL015M33R uniquely combines capless stability, 50 mV dropout, and sub-1 µA shutdown current-making it optimal for miniaturized, battery-life-critical designs where capacitor elimination directly improves reliability and reduces assembly cost.

Availability

LDCL015M33R is available at Aetrix Electronics and suitable for mobile handsets, portable medical sensors, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LDCL015M33R 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The LDCL015 series belongs to ST's ultra-low-dropout linear regulator product line, engineered specifically for space-constrained, battery-powered applications demanding capless operation, extended temperature range, and integrated protection.

FAQ

What is the minimum input voltage required for LDCL015M33R to regulate 3.3 V output?

The minimum input voltage is determined by dropout: VIN(min) = VOUT + VDROP = 3.3 V + 0.05 V = 3.35 V at 100 mA load and 25°C. At full temperature range (−40°C to 125°C) and 150 mA, max dropout is 100 mV, so VIN(min) = 3.4 V. The device also requires VIN ≥ 1.8 V per absolute rating, but regulation only occurs above dropout threshold.

Can LDCL015M33R operate without any external capacitors?

Yes-LDCL015M33R is explicitly designed for capless operation: no input (CIN) or output (COUT) capacitor is required for stability. It remains stable with 0 nF COUT and demonstrates good PSRR and transient response even without external capacitance, as verified in Figures 15–20 of the datasheet.

How does the EN pin behave when left unconnected?

The EN pin has no internal pull-up or pull-down; leaving it floating results in undefined operation and potential malfunction. If unused, it must be hard-wired to VIN (to enable) or GND (to disable). Datasheet Section 7.4 explicitly states: "The EN pin does not have an internal pull-up, which means that it cannot be left floating if it is not used."

Is LDCL015M33R qualified for automotive or safety-critical applications?

No-per ST's official disclaimer (page 17), LDCL015 products are not designed or authorized for safety-critical applications including life-supporting devices, active implanted systems, automotive, aerospace, or environments requiring functional safety certification. It is intended for industrial, consumer, and portable equipment only.