STMicroelectronics LDK220M27R

Overview

LDK220M27R from STMicroelectronics is a 2.7 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, and logic-controlled shutdown with <1 µA off-mode current. It delivers stable power to noise-sensitive analog circuitry in portable consumer electronics.

For engineers reviewing the LDK220M27R datasheet, LDK220M27R pinout, LDK220M27R application, or LDK220M27R equivalent, key selection criteria include dropout performance under 200 mA load, ceramic capacitor compatibility (1 µF), thermal shutdown threshold (160 °C), enable input logic thresholds (0.4 V low / 1.2 V high), and quiescent current behavior across -40 °C to 125 °C.

Technical Context

The LDK220M27R integrates a bandgap reference, error amplifier, and PMOS pass transistor in a low-noise architecture optimized for battery-powered systems. Its internal current limiting and thermal protection activate at 400 mA short-circuit current and 160 °C junction temperature with 20 °C hysteresis.

It supports both fixed-output (2.7 V) and adjustable configurations via the ADJ/NC pin, though the SOT23-5L variant uses the fixed version. The device embeds an active output discharge resistor (18 Ω) when EN is low, preventing floating VOUT during shutdown.

Key Specifications

Pinout & Package

LDK220M27R is packaged in SOT23-5L: 2.95 mm × 1.60 mm × 1.45 mm body, 0.95 mm pitch, thermally enhanced with exposed pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV70727PDQNR and AP2210K-2.7TRG1, the LDK220M27R uniquely combines ultra-low dropout (100 mV), integrated output discharge, and full thermal/current protection - making it optimal for battery longevity and robustness in compact, thermally constrained systems.

Availability

LDK220M27R is available at Aetrix Electronics and suitable for portable medical sensors, smart TV power rails, laptop embedded controllers, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges.

Supply support for LDK220M27R 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 analog LDO portfolio, engineered specifically for ultra-low-power, low-noise applications where battery life, thermal resilience, and ceramic capacitor compatibility are critical design constraints.

FAQ

What is the minimum input voltage required for regulation at 200 mA load?

The LDK220M27R maintains regulation at 200 mA with a minimum input voltage of 2.9 V, based on its maximum dropout voltage of 200 mV (typical 100 mV) at that load. Below this, output voltage drops linearly with input; operation below 2.5 V violates absolute maximum ratings and risks malfunction.

Can the LDK220M27R be used with a 0.47 µF output capacitor?

No - the datasheet specifies a minimum 1 µF ceramic output capacitor for stability across all loads and temperatures. Using 0.47 µF may cause oscillation or poor transient response, especially under 100–200 mA step loads, as confirmed by Figure 22 (stability vs. COUT/ESR).

Is the EN pin internally pulled down when not driven?

No - the EN pin has no internal pull-down. It must be actively driven to GND for shutdown or to VIN for operation; leaving it floating violates the "EN cannot be left floating" requirement in Table 1 and risks undefined state or increased leakage current.

Does the LDK220M27R support reverse current blocking?

No - the device lacks reverse current blocking. If VOUT exceeds VIN (e.g., during hot-swap or backup battery scenarios), current can flow backward from OUT to IN through the internal pass transistor, potentially damaging upstream circuitry or draining batteries.