STMicroelectronics ST2L05R3300K5

Overview

ST2L05R3300K5 from STMicroelectronics is a dual-output low-dropout voltage regulator IC designed for data storage systems, featuring a fixed 3.3V output (VO1) and an adjustable output (VO2) ranging from 1.25V to VI − VDROP. It delivers guaranteed 1A per channel, ±2% output tolerance at 25°C, 1.3V dropout at 1A, and operates across 0°C to 125°C. Used in HDD and optical drive power rails, it supports ceramic/tantalum capacitors and integrates thermal shutdown (175°C) and current limiting.

For engineers reviewing the ST2L05R3300K5 datasheet, ST2L05R3300K5 pinout, ST2L05R3300K5 application, or ST2L05R3300K5 equivalent, key selection criteria include dual-rail stability with low-ESR capacitors, fixed + adjustable topology for mixed-voltage SoC/MCU biasing, thermal resistance (2°C/W junction-to-case in DFN), quiescent current (7mA max), and compatibility with 4.5–7V input supplies in space-constrained storage modules.

Technical Context

This dual LDO integrates two independent linear regulators on a single die: VO1 is factory-trimmed to 3.3V with ±2% accuracy, while VO2 uses an internal 1.25V reference and external resistor divider (pin 2–3–4) for programmable output. Both channels share overtemperature and current-limit protection, with independent bypassing requirements (4.7µF per output).

The device employs proprietary thermal design enabling 2°C/W R_th(j-c) in DFN and SPAK packages-critical for sustained 1A operation in sealed optical drive enclosures. Input ripple rejection is 60dB at 120Hz, and transient response holds within ±10% for 1mA↔1A load steps with ≥1µs edge rates.

Key Specifications

Pinout & Package

ST2L05R3300K5 is packaged in an 8-pin DFN 5×6mm surface-mount package with exposed thermal pad. Pin numbering follows top-through view per datasheet Figure 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TSM102AIDT and TPS7A4700RGWR, ST2L05R3300K5 uniquely integrates dual independent LDOs with thermal/current protection in a compact DFN, eliminating external pass devices and reducing BOM count by ≥50% in optical storage power designs.

Availability

ST2L05R3300K5 is available at Aetrix Electronics and suitable for HARD DISK, CD/DVD-ROM, COMBO (DVD-ROM+CD-R/RW), and BLU-RAY DRIVE applications requiring stable component supply, thermal robustness, and dual-rail flexibility in high-density storage modules.

Supply support for ST2L05R3300K5 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 ICs with broad industrial qualification.

ST2L05 belongs to ST's "Data Storage Power" product line, engineered specifically for thermal efficiency and dual-rail integration in HDD, optical drive, and solid-state hybrid storage systems where space, reliability, and multi-voltage sequencing are critical.

FAQ

What output voltages does ST2L05R3300K5 support?

ST2L05R3300K5 has VO1 fixed at 3.3V and VO2 adjustable from 1.25V to VI − VDROP (minimum ~3.3V − 1.3V = 2.0V at VI = 3.3V+1.3V). The adjustable range is set by external R1/R2 resistors per VO2 = 1.25V × (1 + R1/R2), with typical use cases including 1.8V, 2.5V, and 2.8V for microcontroller cores and analog peripherals.

Can ST2L05R3300K5 operate with ceramic output capacitors?

Yes-ST2L05R3300K5 is explicitly qualified for X7R ceramic capacitors ≥4.7µF on both outputs, provided they are placed within 0.5 inches of VO1/VO2 pins and returned to clean analog ground. Stability is maintained without added ESR, unlike many older LDOs that require tantalum or aluminum electrolytics.

What is the maximum input voltage and dropout behavior?

The absolute maximum input voltage is 10V, but recommended operating range is 4.5V to 7V. Dropout voltage is 1.3V at 1A load per channel, meaning VO2 can regulate down to VI − 1.3V (e.g., 5.7V input supports ≥4.4V adjustable output). Dropout remains stable across 0°C–125°C junction temperature.

How is thermal performance validated for the DFN package?

Thermal resistance is measured as 2°C/W junction-to-case (R_th(j-c)) per datasheet Section 4, verified via standardized cold-plate testing. This enables full 2A combined output current with ≤2°C case temperature rise above ambient-confirmed in real-world HDD enclosure thermal simulations at 70°C ambient and 100% load.