LDK220 LDO Voltage Regulators Datasheet, Features, Pinout, and Applications

The LDK220 is a low-dropout (LDO) voltage regulator from STMicroelectronics, designed to deliver stable and precise output voltages for a variety of applications. With its compact form factor, low quiescent current, and excellent line/load regulation, the LDK220 is ideal for portable devices, automotive electronics, and industrial applications requiring efficient power management.

Overview of LDK220

The LDK220 is a low-dropout voltage regulator capable of delivering a maximum output current of 200 mA with an input voltage range spanning from 2.5 V to 13.2 V. It features a typical dropout voltage of just 100 mV, making it highly efficient for low-power applications.

The regulator is stabilized using a ceramic capacitor at the output, ensuring reliable performance. Its low dropout voltage, combined with low quiescent current and low noise, makes it an ideal choice for battery-operated devices.

An enable logic control feature allows the LDK220 to enter shutdown mode, reducing the total current consumption to less than 1 µA. This makes it particularly suitable for power-sensitive applications.

Additionally, the device integrates essential safety features, including short-circuit constant current limiting and thermal protection, to ensure robust and reliable operation under varying conditions.

LDK220 Features

• Input Voltage Range: 2.5 V to 13.2 V
• Ultra-Low Dropout Voltage: 100 mV (typical @ 100 mA load)
• Low Quiescent Current: 55 µA (typical); 1 µA in shutdown mode
• Low Noise Operation
• Output Voltage Accuracy: ±2.0% at 25 °C
• Output Current: Guaranteed up to 200 mA
• Output Voltage Options: Fixed from 1.2 V to 12 V (100 mV increments) and adjustable versions available
• Logic-Controlled Shutdown: Reduces power consumption when not active
• Output Discharge Capability
• Capacitor Compatibility: Stable operation with a ceramic output capacitor (COUT = 1 µF)
• Built-in Protections: Internal current limiting and thermal shutdown for reliable operation
• Package Options: Available in SOT23-5L, SOT323-5L, SOT-89, and DFN6 (1.2 x 1.3 mm)
• Operating Temperature Range: -40 °C to 125 °C

LDK220 Pinout

Pin Configuration

LDK220 Block Diagram

• Fixed Version

• Adjustable Version

Absolute Maximum Ratings

LDK220 Applications

Battery-Powered Equipment

The LDK220 is highly suitable for battery-operated devices due to its ultra-low dropout voltage and low quiescent current. These features help extend battery life, making it an ideal choice for portable electronics like wearables, handheld medical devices, wireless sensors, and IoT modules. Its ability to regulate voltage efficiently ensures stable power delivery, even as battery levels drop, thereby enhancing the reliability and longevity of battery-powered systems.

TV

Modern televisions demand highly efficient and low-noise power management solutions to maintain picture and audio quality. The LDK220 provides precise voltage regulation for various sensitive components, such as microcontrollers, display panels, and audio circuits, while minimizing power loss and thermal output. Its compact design and high efficiency make it perfect for powering advanced TV systems, including LED/LCD screens and smart TV processors.

Set-Top Box

Set-top boxes (STBs) require reliable power management for their processors, memory, and communication interfaces. The LDK220 ensures stable voltage regulation with minimal heat generation, which is critical in compact STB enclosures where thermal management is a challenge. Its low-noise performance helps maintain signal integrity for video processing and network connectivity, ensuring the smooth operation of streaming and broadcast systems.

PC and Laptop

The LDK220 is well-suited for power regulation in personal computers and laptops, where efficient energy management is essential for both performance and thermal control. It can power sensitive subsystems such as processors, SSD controllers, and peripheral interfaces with precise voltage regulation. Its low dropout voltage minimizes energy waste, extending battery life in portable laptops while ensuring reliable and consistent operation for high-performance computing.

Industrial

In industrial environments, the LDK220 delivers reliable and efficient power regulation for sensors, controllers, and communication devices. Its robust design allows it to operate under challenging conditions, such as fluctuating input voltages and varying loads, while providing stable output power. The device is particularly useful in applications like automation systems, process controllers, motor drives, and industrial IoT, where precision and reliability are paramount for uninterrupted operation.

Typical Application Circuits

LDK220 Package

The LDK220 is available in SOT23-5L, SOT323-5L, SOT-89, and DFN6-1.2x1.3 packages. These options provide flexibility for through-hole and surface-mount assembly, catering to applications ranging from compact embedded systems to thermally demanding designs.

• SOT23-5L Package 

• SOT323-5L Package 

• SOT-89 Package 

• DFN6-1.2x1.3 Package

LDK220 Manufacturer

STMicroelectronics, a global leader in semiconductor solutions, manufactures the LDK220. STMicroelectronics is known for its high-quality, reliable, and energy-efficient power management devices used in various industries.

LDK220 Datasheet

The datasheet for the LDK220 provides detailed information on electrical characteristics, pin configurations, and design guidelines. Engineers can refer to the datasheet to ensure optimal integration of the LDK220 into their systems.

LDK220 vs. Other LDO Voltage Regulators

• LDK220 vs. MIC5365: The MIC5365 offers a similar performance but with a higher quiescent current. The LDK220 is better suited for energy-efficient designs.
• LDK220 vs. TLV707: While both devices provide low dropout voltages, the LDK220 offers higher PSRR, making it ideal for noise-sensitive applications.
• LDK220 vs. LP2985: The LP2985 supports a similar output current but with a slightly higher dropout voltage, whereas the LDK220 ensures better efficiency at low input voltages.

Popular LDK220 LDO Voltage Regulators

Conclusion

The LDK220 LDO Voltage Regulator is a versatile and efficient power management solution for low-power and noise-sensitive applications. With its low dropout voltage, high PSRR, and compact packaging options—including SOT23-5L, SOT323-5L, SOT-89, and DFN6-1.2x1.3—the LDK220 is ideal for consumer electronics, industrial systems, automotive electronics, and IoT devices. Its robust design and protection features ensure reliable operation in demanding environments.

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