AP2112K-3.3TRG1 3.3V 600mA Linear Voltage Regulator IC SOT-23-5

AP2112K-3.3TRG1 3.3V 600mA Low Dropout (LDO) Linear Voltage Regulator IC is a highly precise and robust solution for stable power delivery in portable and battery-powered electronics. This fixed-output, high-current LDO efficiently converts an unregulated input voltage into a precise 3.3V output. Consequently, it is an ideal choice for powering digital circuits, microcontrollers, and wireless modules that demand extremely clean power. The AP2112K-3.3TRG1 features extremely low noise and very low dropout voltage, which significantly extends the battery life in handheld devices. Furthermore, built-in protection mechanisms like over-current and over-temperature shutdown actively safeguard the IC and your downstream components from damage.

Key Features:

• High Output Current: Delivers a continuous output current of up to 600 mA, suitable for powering complex digital and analog loads.
• Low Dropout Voltage (V_DO): Features an impressively low dropout voltage, typically 250 mV at 600 mA, maximizing efficiency and enabling operation with small headrooms.
• Fixed Output Voltage: Provides a precise and stable 3.3V output, eliminating the need for external feedback resistors and simplifying PCB design.
• Fast Transient Response: This regulator offers excellent load and line transient response, ensuring the output remains stable even during sudden current demands.
• Integrated Protection: Includes comprehensive over-current protection (OCP) and over-temperature protection (OTP) features, protecting the system from fault conditions.

Technical Specifications:

• Output Voltage (V_OUT): 3.3 V (±1.5% accuracy)
• Maximum Output Current (I_OUT): 600 mA
• Input Voltage Range (V_IN): 2.5 V to 6 V
• Quiescent Current (I_Q): Typically 60 μA (Extends battery life)
• Dropout Voltage (V_DO): ≈ 250 mV @ 600 mA
• Line Regulation: 0.01% / V typical
• Operating Temperature Range (T_J): −40°C to +85°C

Mechanical Specifications:

• Package Type: SOT-23-5 (Surface Mount Technology)
• Lead Finish: Lead-free, Halogen-free (Green Mold Compound)
• Moisture Sensitivity Level (MSL): Level 1 (Suitable for standard soldering processes)
• Packing: Tape & Reel (TR) for high-volume automated assembly

Dimensions:

• Body Length: 2.9 mm
• Body Width: 1.6 mm
• Body Height: ≈ 1.1 mm
• Pin Pitch: 0.95 mm (Standard SOT-23-5 pitch)
• Footprint: Highly compact footprint for space-constrained applications.

Pinout and Wiring:

• Pin 1 (GND): Connect this pin to the circuit ground reference (0 V).
• Pin 2 (V_OUT): This is the regulated 3.3V output pin; you must connect a bypass capacitor here.
• Pin 3 (NC): No connection (Do not connect this pin).
• Pin 4 (EN): Enable pin (Active High); you must connect this pin to V_IN for continuous operation or a logic signal to turn the regulator on/off.
• Pin 5 (V_IN): Connect the unregulated input voltage supply (2.5 V to 6 V) to this pin.
• Wiring Note: Always place input and output ceramic capacitors (e.g., 1 μF) as close as possible to the IC pins to ensure stability and suppress noise.

Datasheet Reference:

• Download Diodes Inc. AP2112 Datasheet

Commonly Used in:

• Portable Equipment: Ideal for use in smartphones, tablets, and handheld measuring instruments due to low quiescent current.
• Wireless Modules: Powering sensitive 3.3V RF components like Bluetooth, Wi-Fi, and Zigbee modules where low noise is critical.
• Battery-Powered Devices: Essential in wearables and IoT sensors where maximizing battery run-time is a primary design goal.

Applications:

• Microcontroller Power: Supplying stable 3.3V to ARM, AVR, and PIC microcontrollers.
• Post-Regulation Filtering: Used to clean up the output of switching power supplies, providing cleaner voltage to sensitive analog circuits.
• Load Switch Circuitry: The EN pin allows designers to use the IC as a controlled power switch for specific sub-systems, further conserving energy.

Equivalent Models:

• XC6206P332MR (Torex): A functionally similar 3.3V fixed LDO, commonly used as an alternative in compact designs.
• LP2985-3.3 (Texas Instruments): However, this is a comparable, lower-current (150 mA) LDO with similar precision and low noise characteristics.
• TLV70033DCKR (Texas Instruments): This model offers the same 3.3V output and often shares a similar SOT-23-5 pinout, serving as a reliable substitute.

Package Includes:

• 1 x AP2112K-3.3TRG1 3.3V 600mA Low Dropout Linear Voltage Regulator IC (SOT-23-5)