STMicroelectronics LDK220M25R

Overview

LDK220M25R from STMicroelectronics is a 2.5 V fixed-output, 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, 55 µA typical quiescent current, and logic-controlled shutdown with <1 µA off-mode current. It stabilizes battery-powered consumer electronics requiring stable low-noise 2.5 V rail.

For engineers reviewing the LDK220M25R datasheet, LDK220M25R pinout, LDK220M25R application, or LDK220M25R equivalent, this page delivers verified electrical specs, package-specific pin mapping, real-world use cases, and validated alternative options for portable power management design.

Technical Context

The LDK220M25R integrates a bandgap reference, error amplifier, and PMOS pass transistor to deliver precise 2.5 V regulation across -40 °C to 125 °C. Its internal current limiting and thermal shutdown (160 °C) ensure robust operation under overload or ambient stress.

It supports ceramic output capacitors as low as 1 µF and includes an active output discharge function triggered when EN is low-critical for preventing floating outputs during power sequencing in multi-rail systems.

Key Specifications

Pinout & Package

LDK220M25R is supplied in SOT23-5L package (JEDEC TO-236AB), measuring 2.95 mm × 1.60 mm × 1.45 mm, with exposed pad not electrically connected. Thermal resistance R_thJA = 160 °C/W enables 200 mA operation up to +85 °C ambient without heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, 200 mA LDO applications.

Compared with XC6219B252MR-G and AP7361-25SG-7, LDK220M25R uniquely combines ultra-low dropout (100 mV), integrated EN control, and active output discharge-enabling simpler, more reliable power sequencing in space-constrained portable and industrial systems.

Availability

LDK220M25R is available at Aetrix Electronics and suitable for battery-powered equipment, set-top boxes, and industrial PLC modules requiring stable component supply with extended temperature support and low-noise regulation.

Supply support for LDK220M25R 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 high-performance LDO portfolio targeting ultra-low-power, low-noise applications in portable and industrial electronics-emphasizing dropout efficiency, thermal robustness, and ease of integration.

FAQ

What is the minimum input voltage required for LDK220M25R to maintain regulation?

The LDK220M25R requires VIN ≥ VOUT + VDROP to sustain regulation. With nominal VOUT = 2.5 V and typical dropout = 100 mV at 100 mA, minimum VIN is 2.6 V. At 200 mA and elevated temperature, dropout rises to 350 mV, so VIN must be ≥ 2.85 V for full-load operation across temperature.

Can LDK220M25R be used with a 1 µF ceramic output capacitor?

Yes-LDK220M25R is explicitly characterized and stabilized with 1 µF X5R/X7R ceramic capacitors (ESR < 100 mΩ). The datasheet confirms stability across 1–22 µF range, eliminating need for larger or higher-ESR capacitors and reducing PCB footprint and cost.

Does LDK220M25R require an external pull-up on the EN pin?

Yes-the EN pin must not be left floating. ST specifies that EN must be driven high (≥1.2 V) for normal operation or low (≤0.4 V) for shutdown. A 100 kΩ pull-up to VIN is recommended if MCU GPIO is unavailable, ensuring default-on behavior and preventing undefined startup states.

Is thermal derating required for continuous 200 mA operation in SOT23-5L package?

Yes-SOT23-5L has R_thJA = 160 °C/W. At 200 mA and 2.6 V input (0.1 V dropout), power dissipation is 20 mW. Ambient temperature can reach +105 °C before junction exceeds 125 °C. For sustained 200 mA above +85 °C ambient, consider thermal relief via copper pour or lower load current.