STMicroelectronics ST1L02PU18R

Overview

ST1L02PU18R from STMicroelectronics is a fixed-output 1.8 V, 1 A low-dropout linear voltage regulator using BiCMOS technology, with ±2% output tolerance at 25 °C, max 500 µA quiescent current over temperature, and 0.7 V typical dropout at 1 A load. It is designed for data storage applications including HDD read channel and memory chip power supply.

For engineers reviewing the ST1L02PU18R datasheet, ST1L02PU18R pinout, ST1L02PU18R application, or ST1L02PU18R equivalent, key selection criteria include output stability with low-ESR ceramic capacitors, thermal shutdown with hysteresis, overcurrent protection, and DFN6D (3×3 mm) package compatibility in space-constrained embedded systems.

Technical Context

The ST1L02PU18R implements a BiCMOS-based LDO architecture optimized for low-noise, high-PSRR regulation in data-intensive storage subsystems. Its internal circuitry integrates precision bandgap reference, error amplifier, and current-limited pass transistor with thermal foldback.

It supports stable operation with 4.7 µF ceramic input/output capacitors, delivers regulated 1.8 V under 0–125 °C junction temperature, and features dedicated VO_SENSE pin for remote sensing-enabling accurate regulation despite PCB trace resistance in high-current paths.

Key Specifications

Pinout & Package

ST1L02PU18R is housed in a thermally enhanced DFN6D (3×3 mm) package with exposed GND pad for improved heat dissipation. The package complies with ECOPACK® environmental standards and JEDEC JESD97 marking requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B182MR-G and RT9193-18GB, ST1L02PU18R uniquely combines 1 A output, remote sensing, and thermal hysteresis in a thermally robust DFN6D package-making it the only option qualified for high-reliability HDD read channel regulation.

Availability

ST1L02PU18R is available at Aetrix Electronics and suitable for HDD read channel designs, flash memory controller power supplies, and embedded storage modules requiring stable component supply across extended temperature and long production lifecycles.

Supply support for ST1L02PU18R 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 analog, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The ST1L02xx series belongs to ST's high-precision, low-noise LDO portfolio-engineered specifically for data storage and high-speed memory interface applications demanding tight voltage tolerance and robust thermal behavior.

FAQ

What is the minimum input voltage required for ST1L02PU18R to regulate at full 1 A load?

The minimum input voltage is determined by dropout: at 1 A, typical V_d = 0.7 V, so VI(min) = VO + V_d = 1.8 V + 0.7 V = 2.5 V. Absolute maximum dropout is 1.1 V per datasheet Table 6, requiring VI ≥ 2.9 V for guaranteed 1 A operation across temperature and process variation.

Can ST1L02PU18R operate without connecting the VO_SENSE pin?

Yes-VO_SENSE is optional. When left unconnected, regulation occurs at the VO pin. However, without remote sensing, output voltage at downstream loads may deviate by up to ±(I_OUT × R_TRACE) due to PCB trace resistance; ST recommends tying VO_SENSE directly to VO for standard applications unless point-of-load accuracy is critical.

Is the exposed thermal pad on the DFN6D package electrically connected?

Yes-the exposed metallic pad is internally connected to the GND terminal (Pin 2). It must be soldered to a PCB copper pour tied to system ground to ensure proper thermal performance and electrical integrity. Thermal resistance junction-to-case is 10 °C/W when the pad is fully soldered per recommended footprint.

Does ST1L02PU18R require external compensation components?

No-ST1L02PU18R is internally compensated and stable with 4.7 µF ceramic capacitors on both input and output. No external resistors, capacitors, or feedforward networks are needed. The design eliminates compensation tuning while maintaining phase margin >60° across all load and temperature conditions.