STMicroelectronics LDK220U50R Low Dropout Linear Voltage Regulator

Reliable Power Management Solution for Modern Electronics

The STMicroelectronics LDK220U50R represents a new generation of low dropout linear voltage regulators designed to deliver stable power management in compact electronic systems. This fixed-output 5V regulator combines exceptional performance characteristics with robust protection features, making it ideal for applications requiring precise voltage regulation in space-constrained environments.

Advanced LDO Technology

Engineered with STMicroelectronics' proprietary VIP™ (Vertical Integrated Process) technology, the LDK220U50R achieves remarkable efficiency while maintaining a minimal footprint. The SOT-89 package houses a sophisticated architecture that ensures stable 200mA output current with just 0.35V dropout voltage at maximum load. This exceptional performance enables designers to create energy-efficient systems while reducing overall BOM costs.

Key technical advantages include:

Industrial-Grade Reliability

Designed for demanding environments, this voltage regulator operates flawlessly across the extended -40°C to 125°C temperature range. The integrated PSRR (Power Supply Rejection Ratio) performance of 55dB at 120Hz rising to 50dB at 10kHz ensures clean power delivery even in noisy environments. The enable pin control feature allows for precise power sequencing in complex systems, while the comprehensive protection circuitry guards against overcurrent and thermal overload conditions.

Optimized for Modern Applications

The LDK220U50R's compact TO-243AA surface-mount package makes it particularly suitable for portable electronics, IoT devices, and automotive applications where space conservation is critical. Its low quiescent current characteristics extend battery life in handheld devices, while the wide input voltage range accommodates various power sources including Li-ion batteries and automotive power rails.

Typical applications include:

• Smart sensors and wearable electronics
• Industrial control systems
• Automotive infotainment modules
• Medical monitoring equipment
• Low-power microcontroller circuits

Design Flexibility

While optimized for fixed 5V operation, the LDK220U50R's design allows output voltage adjustment through external resistor networks when combined with STMicroelectronics' reference voltage ICs. This flexibility makes it a versatile solution for systems requiring multiple regulated voltage rails. The device's compatibility with ceramic output capacitors further reduces solution size and cost while maintaining stability.

Packaging and Compliance

Supplied in Tape & Reel packaging (TR), this RoHS-compliant component meets the highest environmental standards. The SOT-89 package offers excellent thermal dissipation characteristics for its size, with a thermal resistance (RθJA) of 150°C/W in standard PCB mounting conditions.

Tags: Power Management IC, Linear Voltage Regulator, SOT89 Package, Industrial Electronics, Automotive Electronics