AP2112K-3.3TRG1 3.3V 600mA CMOS LDO Voltage Regulator SOT25

Features

• Output Voltage Accuracy: ±1.5%
• Output Current: 600mA (Min.)
• Foldback Short Current Protection: 50mA
• Enable Function to Turn ON/OFF VOUT
• Low Dropout Voltage (3.3V): 250mV (Typ.) @lour = 600mA
• Excellent Load Regulation: 0.2%/A (Typ.)
• Excellent Line Regulation: 0.02%/v (Typ.)
• Low Quiescent Current: 55μA (Typ.)
• Low Standby Current: 0.01μA (Typ.)
• Low Output Noise: 50μv RMS
• PSRR: 100Hz -65dB, 1kHz -65dB
• OTSD Protection
• Stable with 1.0μF Flexible Cap: Ceramic, Tantalum and Aluminum Electrolytic
• Operation Temperature Range: -40°C to +85°C
• ESD: MM 400V, HBM 4000V
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free. “Green” Device

Unlock New Capabilities

      Past Projects

• If you've already experimented with basic power regulation using linear 5V regulators like the 7805 or LM317, you understand the basics of dropping voltage. However, those older chips are inefficient, run hot, and drain batteries quickly when idle. The AP2112K is the modern upgrade you need when moving to low-voltage, low-power electronics.

      Feature Upgrade

• This AP2112K-3.3TRG1 LDO unlocks the ability to safely power sensitive 3.3V microcontrollers (like ESP32, ESP8266, and STM32) directly from a 5V USB source or a single LiPo cell without severe heat dissipation issues. Its ultra-low standby current makes it perfect for IoT battery-powered sensor nodes, portable handheld devices, and any project that must run for months on a single charge.

Package includes:

• 1× Diodes AP2112K-3.3TRG1 LDO Voltage Regulator SOT25 package

Frequently Asked Questions

• Q1: Is the AP2112K-3.3TRG1 compatible with ESP32 and ESP8266 microcontrollers?
  Yes, it is highly recommended for ESP32 and ESP8266 boards as it easily supplies the 500mA+ current spikes required during active WiFi transmission.
• Q2: Can I use the AP2112K LDO to power an Arduino Uno?
  You can use it to power 3.3V sensors connected to the Uno, but the standard Arduino Uno itself operates on 5V logic and cannot be powered directly by this 3.3V regulator.
• Q3: Does the AP2112K-3.3TRG1 work with standard 3.3V logic level shifters?
  Absolutely, it provides a perfectly stable 3.3V reference voltage that is ideal for the low-voltage side of bi-directional I2C or SPI logic level shifters.
• Q4: Can I use multiple AP2112K regulators on the same PCB?
  Yes, you can place multiple regulators on the same board to isolate noisy components (like motors) from sensitive components (like analog sensors), provided each has its own decoupling capacitors.
• Q5: What is the maximum input voltage for the AP2112K-3.3TRG1?
  The absolute maximum input voltage is 6.5V, but the recommended operating input voltage range is between 2.5V and 6.0V.
• Q6: How much current can the AP2112K 3.3V regulator provide?
  The regulator is guaranteed to deliver a continuous load current of 600mA, assuming proper thermal dissipation on your PCB.
• Q7: What is the dropout voltage of the AP2112K at full load?
  At a full 600mA load, the typical dropout voltage is just 250mV, meaning you only need about 3.55V on the input to maintain a stable 3.3V output.
• Q8: How do I connect the Enable (EN) pin on the AP2112K-3.3TRG1?
  To keep the regulator always on, tie the EN pin directly to the VIN pin; to control it dynamically, connect it to a digital GPIO pin.
• Q9: What capacitors are required for wiring the AP2112K regulator?
  You must connect a 1.0µF ceramic capacitor (X7R or X5R dielectric) to both the input pin (VIN to GND) and the output pin (VOUT to GND) for loop stability.
• Q10: Can I leave the NC pin on the AP2112K-3.3TRG1 floating?
  Yes, the NC (No Connection) pin is not internally connected to the silicon die and can be left floating or soldered to an isolated pad for physical stability.