LDI8119-3.3EN Linear Voltage Regulator SOT-23-5

LDI8119-3.3EN Linear Voltage Regulator SOT-23-5 is a high-performance, low-dropout (LDO) regulator designed to deliver a stable and precise 3.3V output for modern electronic systems. This component excels in applications requiring low noise and high power supply rejection ratios, ensuring that sensitive digital and analog circuits receive clean power. Furthermore, its ultra-compact SOT-23-5 package makes it an ideal choice for space-constrained designs such as IoT modules and handheld devices. Consequently, designers can achieve high efficiency and thermal stability without sacrificing valuable PCB real estate. Therefore, you should consider the LDI8119-3.3EN as a reliable power management solution for your next high-density electronic project.

Key Features:

• Low Dropout Voltage: The device maintains a stable 3.3V output even when the input voltage is only slightly higher than the output, maximizing battery life in portable electronics.
• Enable Control Pin: An integrated active-high enable pin allows the host microcontroller to shut down the regulator. However, this feature reduces standby current to near-zero levels during sleep modes.
• High PSRR: Excellent power supply rejection ratio ensures that input ripples and noise do not interfere with the performance of sensitive downstream components.
• Thermal and Overcurrent Protection: Built-in safety mechanisms safeguard the IC from damage caused by excessive heat or accidental short circuits.
• Ultra-Small Footprint: The SOT-23-5 surface-mount package provides a tiny footprint, which is essential for modern, compact hardware designs.

Technical Specifications:

• Output Voltage: Fixed 3.3 V
• Maximum Input Voltage: 6.0 V
• Output Current: 300 mA to 500 mA (Typical maximum range for LDI8119 series)
• Dropout Voltage: ≈ 200 mV at full load
• Quiescent Current: ≈ 50 μA (Typical)
• Output Voltage Accuracy: ±2%
• Operating Temperature: −40°C to +125°C

Mechanical Specifications:

• Package Type: SOT-23-5 (Small Outline Transistor)
• Lead Style: Gull-wing leads for surface mount (SMD/SMT)
• Flammability Rating: UL 94 V-0 compliant
• Moisture Sensitivity Level: MSL 1

Dimensions:

• Body Length: ≈ 2.90 mm
• Body Width: ≈ 1.60 mm (Lead to lead 2.80 mm)
• Body Height: ≈ 1.10 mm
• Pin Pitch: 0.95 mm
• Weight: ≈ 0.015 g

Pinout and Wiring:

• Pin 1 (VIN): Input voltage supply pin. Connect a 1μF to 10μF ceramic capacitor to ground for stability.
• Pin 2 (GND): Ground reference for the IC.
• Pin 3 (EN): Enable pin. Drive high to enable the output; drive low to enter shutdown mode.
• Pin 4 (NC/BP): No connection or Bypass pin depending on specific sub-variant. Consequently, check the circuit layout for noise reduction capacitor requirements.
• Pin 5 (VOUT): Regulated 3.3V output. Connect a ceramic capacitor (typically ≥ 1μF) to ensure a stable ripple-free supply.

Datasheet Reference:

• Download LDI8119-3.3EN Voltage Regulator Datasheet

Commonly Used in:

• Wireless Modules: Powering ESP8266, ESP32, and LoRa modules which require a stable 3.3V source.
• Wearable Tech: Providing power to sensors and micro-displays in fitness trackers and smartwatches.
• Battery Powered Devices: Ideal for systems operating from Li-Po or Li-ion batteries where voltage drop must be minimized.

Applications:

• Embedded Systems: Serving as the primary LDO for 3.3V logic circuits in industrial controllers.
• Camera Modules: Delivering noise-free power to image sensors to prevent visual artifacts.
• Portable Medical Equipment: Ensuring steady voltage for diagnostic tools and handheld monitors.

Equivalent Models:

• AP2112K-3.3: A very popular LDO with a similar SOT-23-5 pinout and 3.3V output.
• TLV70033: A Texas Instruments alternative that provides comparable dropout and current ratings.
• MIC5219-3.3: A high-performance LDO, furthermore, it offers similar thermal characteristics in a tiny package.

Package Includes:

• 1 x LDI8119-3.3EN Linear Voltage Regulator SOT-23-5