STMicroelectronics LDK220M30R

Overview

LDK220M30R from STMicroelectronics is a fixed-output 3.0 V, 200 mA low-dropout linear regulator in SOT23-5L package, featuring 100 mV typical dropout at 100 mA, ±2.0% output voltage tolerance at 25 °C, and logic-controlled shutdown with <1 µA off-mode current. It delivers stable power to noise-sensitive analog circuitry in space-constrained portable systems.

For engineers reviewing the LDK220M30R datasheet, LDK220M30R pinout, LDK220M30R application, or LDK220M30R equivalent, key selection criteria include dropout performance under 200 mA load, ceramic capacitor compatibility (1 µF COUT), thermal shutdown behavior (160 °C), EN pin logic thresholds, and package-specific thermal resistance (RthJA = 160 °C/W for SOT23-5L).

Technical Context

The LDK220M30R employs a bandgap-referenced op-amp control loop with internal current limiting and thermal protection. Its enable input directly controls an internal pass transistor gate, enabling fast startup (200 µs) and active output discharge when EN is low.

It supports both fixed (3.0 V) and adjustable versions, but LDK220M30R is fixed-output only and excludes ADJ functionality. The device operates across -40 °C to +125 °C junction temperature and maintains 55 µA typical quiescent current across full input range (2.5–13.2 V) and load (0–200 mA).

Key Specifications

Pinout & Package

LDK220M30R is supplied in SOT23-5L package (2.95 mm × 1.60 mm × 1.45 mm), optimized for high thermal resistance (RthJA = 160 °C/W) and board-level reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LDK220M30R, XC6219B302MR-G offers lower cost but sacrifices discharge function and thermal performance, while RT9193-30GB delivers more current but lacks integrated enable and has higher noise-making LDK220M30R optimal for compact, noise-sensitive, sequenced-power designs.

Availability

LDK220M30R is available at Aetrix Electronics and suitable for portable medical sensors, smart TV power rails, laptop subsystem management, and industrial PLC I/O modules requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.

Supply support for LDK220M30R 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 LDK220 series belongs to ST's precision low-noise LDO portfolio, engineered specifically for battery-powered and noise-critical applications where dropout, quiescent current, and output stability are design-determining parameters.

FAQ

What is the minimum input voltage required for LDK220M30R to maintain 3.0 V regulation at 200 mA?

The dropout voltage is 350 mV maximum at 200 mA and 125 °C (per Table 6). Therefore, minimum input is 3.0 V + 0.35 V = 3.35 V under worst-case thermal/load conditions. At 25 °C and 100 mA, typical dropout is 100 mV, allowing VIN as low as 3.1 V.

Can LDK220M30R be used with a 22 µF ceramic output capacitor?

Yes - datasheet Table 6 specifies COUT range of 1–22 µF. A 22 µF X7R ceramic capacitor is explicitly supported and improves load transient response. Ensure ESR remains below 1 Ω, as confirmed in Figure 22 stability chart.

Is the EN pin internally pulled up or down?

No internal pull exists - EN must be actively driven. Table 6 defines VIL ≤ 0.4 V and VIH ≥ 1.2 V, and the datasheet explicitly states "EN cannot be left floating." External pull-up or microcontroller GPIO is required for deterministic state control.

Does LDK220M30R support reverse-voltage protection on the OUT pin?

No - the device lacks reverse-battery or reverse-current protection. Applying external voltage to VOUT while EN is low risks damage, as noted in Figure 2 footnote: "To avoid damages to the discharge function, we discourage to apply any external voltage to VOUT pin when Enable pin is low."