MIC5219-3.3YM5 LG33 500mA Peak Output LDO Regulator SOT23-5

MIC5219-3.3YM5 LG33 500mA Peak Output LDO Regulator SOT23-5 is an ultra-low-dropout (LDO) linear regulator designed specifically for battery-powered applications that demand high peak current and low noise. This high-performance device efficiently provides a stable 3.3V output while maintaining an exceptionally low dropout voltage, typically around 350mV at its full 500mA load. Consequently, it extends battery life in portable electronics by operating effectively even as the input voltage drops close to the output level. Furthermore, the integrated enable pin allows for zero-current shutdown mode, significantly reducing power consumption when the system is idle. Therefore, the MIC5219 serves as an ideal solution for modern wireless devices and high-accuracy analog circuits where board space and thermal efficiency remain top priorities.

Key Features:

• High Peak Output Current: The regulator delivers up to 500mA of peak current, which easily handles the startup surges of RF transceivers and small motors.
• Ultra-Low Dropout Voltage: Features a dropout voltage of typically 10mV at light loads and ≈ 350mV at 500mA, maximizing the usable energy from batteries.
• Very Low Ground Current: Utilizes a CMOS-compatible design to maintain a ground current of only 80 μA at light loads, improving overall system efficiency.
• Enable/Shutdown Control: Includes a logic-level enable input that permits the user to switch the regulator into a low-power “off” state.
• Thermal and Current Protection: Incorporates internal thermal shutdown and current limit circuitry to prevent device failure during fault conditions.

Technical Specifications:

• Fixed Output Voltage: 3.3 V
• Input Voltage Range: 2.5 V to 12 V
• Continuous Output Current: 500 mA (Peak)
• Dropout Voltage: ≈ 350 mV @ 500 mA load
• Output Accuracy: ±2.0% over temperature
• Quiescent Current (I_Q): Typical 80 μA
• Operating Junction Temperature: −40°C to +125°C

Mechanical Specifications:

• Package Type: SOT-23-5 (Small Outline Transistor)
• Marking Code: LG33
• Mounting Type: Surface Mount Device (SMD/SMT)
• Lead Frame Material: Copper Alloy with Matte Tin plating

Dimensions:

• Body Length: ≈ 2.90 mm
• Body Width (including leads): ≈ 2.80 mm
• Body Height: ≈ 1.10 mm
• Pin Pitch: 0.95 mm

Pinout and Wiring:

• Pin 1 (IN): Input Supply Voltage. Bypass this pin with a 1 μF capacitor to ground.
• Pin 2 (GND): Ground Reference. Connect directly to the system ground plane.
• Pin 3 (EN): Enable Input. Drive this pin high to enable the regulator; however, driving it low enters shutdown mode.
• Pin 4 (BYP): Reference Bypass. Connect an optional 470 pF capacitor here to achieve ultra-low noise performance.
• Pin 5 (OUT): Regulated 3.3V Output. Requires a minimum 1 μF tantalum or ceramic capacitor for stability.

Datasheet Reference:

• Download Microchip MIC5219 LDO Datasheet

Commonly Used in:

• Wireless Communication Modules: Providing clean power to Wi-Fi, Bluetooth, and LoRa modules that experience high peak current pulses.
• Portable Medical Devices: Ensuring stable voltage for precision sensors in handheld diagnostic tools.
• Battery Management Systems: Managing voltage conversion in Li-Ion and Li-Po powered handheld gadgets.

Applications:

• Laptop and Tablet Subsystems: Regulating local power rails for peripherals and auxiliary logic.
• Digital Cameras: Powering image sensors and flash controllers where low noise is critical.
• GPS Receivers: Supplying highly stable 3.3V power to sensitive satellite tracking chipsets.

Equivalent Models:

• AP2114H-3.3 (Diodes Inc): A similar 3.3V LDO with high output current capability and low dropout.
• LP38691-3.3 (Texas Instruments): Nevertheless, ensure you check the pinout as the SOT package layout might differ.
• RT9198-33 (Richtek): A high-performance 300mA/500mA LDO often used as a direct alternative in consumer electronics.

Package Includes:

• 1 x MIC5219-3.3YM5 LG33 500mA Peak Output LDO Regulator SOT23-5