STMicroelectronics ST2L05R3325PS

Overview

ST2L05R3325PS from STMicroelectronics is a dual low-dropout linear voltage regulator IC designed for data storage systems, delivering 3.3V fixed output on VO1 and 2.5V fixed output on VO2, each rated for 1A continuous current, ±2% output tolerance at 25°C, 1.3V dropout at 1A, and stable operation with low-ESR ceramic capacitors - deployed in hard disk drives and DVD-R/RW controllers.

For engineers reviewing the ST2L05R3325PS datasheet, ST2L05R3325PS pinout, ST2L05R3325PS application, or ST2L05R3325PS equivalent, this dual LDO supports tightly regulated dual-rail power for storage controller SoCs, requires no external compensation, operates across 0°C to 125°C, and integrates thermal shutdown and current limiting - critical for compact, thermally constrained optical and magnetic storage modules.

Technical Context

This device implements two independent LDO regulator blocks in a single monolithic IC: VO1 is factory-trimmed to 3.3V (±2% at 25°C), VO2 is fixed at 2.5V (±2% at 25°C), both featuring internal current limiting (1A per channel), thermal shutdown at 175°C with 5°C hysteresis, and guaranteed stability with ≥4.7µF X7R ceramic output capacitors.

The architecture uses separate internal reference and error amplifiers per channel, enabling simultaneous regulation without cross-coupling, while the DFN 5×6mm 8-pin package provides 2°C/W junction-to-case thermal resistance - enabling high-power-density deployment in space-constrained storage PCBs where thermal management is critical.

Key Specifications

Pinout & Package

ST2L05R3325PS is housed in an 8-pin DFN 5×6mm surface-mount package with exposed thermal pad (pin 6), optimized for high thermal conductivity and compact layout in storage drive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A8300RGRT and dual ADM7150s, ST2L05R3325PS delivers optimal trade-off for storage applications: integrated dual regulation with proven thermal robustness in DFN, minimal external components, and qualification across 0–125°C - avoiding the overhead of discrete solutions or over-engineered alternatives.

Availability

ST2L05R3325PS is available at Aetrix Electronics and suitable for hard disk drive controllers, CD/DVD-ROM modules, combo optical drives, and DVD-R/RW recording subsystems requiring stable component supply, long-lifecycle support, and automotive-qualified thermal performance.

Supply support for ST2L05R3325PS 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, specializing in power management, microcontrollers, and automotive-grade analog ICs with ISO 9001 and AEC-Q100 certified manufacturing.

ST2L05R3325PS belongs to ST's ST2L series of dual LDO regulators, engineered specifically for high-reliability data storage applications where compact size, thermal efficiency, and dual-rail integration reduce system-level complexity and cost.

FAQ

What input voltage range is supported by ST2L05R3325PS?

The ST2L05R3325PS operates with an input voltage range of 4.5V to 7V. This range ensures compatibility with standard 5V power buses while maintaining sufficient headroom above the 1.3V dropout voltage required for stable 3.3V and 2.5V outputs at full 1A load. Input ripple must be limited to ±0.15V, and rise/fall times must exceed 1µs to avoid triggering internal protection circuits.

Can ST2L05R3325PS be used with ceramic output capacitors?

Yes - ST2L05R3325PS is explicitly designed for stability with low-ESR X7R ceramic capacitors. A minimum of 4.7µF is required on both VO1 and VO2, placed within 0.5 inches of their respective pins and returned to a clean analog ground. Y5V ceramics are not recommended due to temperature- and voltage-dependent capacitance drift that may compromise regulation stability.

Is pin 2 (ADJ/N.C.) required to be connected for ST2L05R3325PS?

No - ST2L05R3325PS is a fixed/fixed version (3.3V/2.5V), so pin 2 is Not Connected (N.C.) and must remain unconnected or tied to GND. Connecting it to a resistor divider would have no effect, as the internal ADJ node is disconnected in fixed-output variants. Leaving it floating is acceptable per datasheet guidance.

What thermal performance can be expected in the DFN 5×6mm package?

In the DFN 5×6mm package, ST2L05R3325PS achieves 2°C/W junction-to-case thermal resistance. With proper PCB copper area under the thermal pad (≥200 mm²), it sustains 1A per output continuously at 70°C ambient without exceeding the 150°C maximum junction temperature. Derating begins above 125°C case temperature, consistent with its 0–125°C operating ambient rating.