RT9193-33GB LDO 3.3V 300mA Voltage Regulator SOT23-5

RT9193-33GB LDO 3.3V 300mA Voltage Regulator SOT23-5 is an ultra-low dropout (LDO) linear voltage regulator engineered to provide a highly accurate and stable 3.3V power source for sensitive electronic components. This device utilizes a CMOS process technology, minimizing power consumption and achieving an impressively low quiescent current, which significantly extends battery life in portable applications. The RT9193-33GB delivers a reliable output current of up to 300 mA while demanding only a tiny voltage difference between its input and output. Consequently, designers favor this regulator for powering low-voltage microcontrollers, RF modules, and sensors where efficiency and minimal heat generation are paramount. Furthermore, its compact SOT-23-5 package allows engineers to easily integrate high-performance power management into space-constrained designs.

Key Features:

• Ultra-Low Dropout Voltage: The regulator achieves a typical dropout voltage of only 120 mV at 300 mA output current, maximizing efficiency and minimizing power loss.
• High Output Accuracy: It provides a fixed 3.3V output voltage with an accuracy of ±2% across load and temperature variations, ensuring stable power delivery to sensitive loads.
• Low Quiescent Current (I_Q): The device draws a low ground current (typically 30 μA), making it ideal for battery-powered and always-on applications.
• Output Current Capability: Capable of sourcing a continuous output current up to 300 mA, suitable for powering typical digital and wireless circuits.
• Fast Transient Response: The internal circuitry offers excellent line and load transient response, maintaining output voltage stability during sudden changes in current demand.

Technical Specifications:

• Fixed Output Voltage (V_OUT): 3.3 V
• Maximum Output Current (I_OUT): 300 mA
• Input Voltage Range (V_IN): 2.5 V to 5.5 V
• Dropout Voltage (V_DO): 120 mV (Typ. at I_OUT = 300 mA)
• Quiescent Current (I_Q): 30 μA (Typ.)
• Output Voltage Accuracy: ±2%
• Operating Temperature Range: −40°C to +85°C

Mechanical Specifications:

• Package Type: SOT-23-5 (Small Outline Transistor)
• Mounting: Surface Mount Technology (SMT/SMD)
• Lead Plating: Lead (Pb)-free finish
• Thermal Resistance (θ_JA): ≈ 250 °C/W (Junction to Ambient)

Dimensions:

• Body Length: ≈ 2.9 mm
• Body Width: ≈ 1.6 mm
• Height: ≈ 1.1 mm
• Pitch: 0.95 mm (Between pins)
• Footprint: Highly compact footprint for miniaturized electronic assemblies.

Pinout and Wiring:

• Pin 1 (GND): Connect this pin directly to the system ground reference.
• Pin 2 (EN): This is the Enable/Shutdown pin. Connect it to V_IN for continuous operation, or to GND to disable the regulator and reduce current consumption to sub-microamp levels.
• Pin 3 (V_IN): Apply the unregulated input voltage (e.g., battery or 5V rail) to this pin.
• Pin 4 (V_OUT): This pin provides the stable, regulated 3.3V output to your load circuit.
• Pin 5 (NC): No Connection. Leave this pin floating or unconnected.
• Wiring Note: Always place a ceramic bypass capacitor (typically 1 μF) on both the V_IN and V_OUT pins, ensuring minimal trace length for optimal stability and transient response.

Datasheet Reference:

• Download Richtek RT9193 Datasheet

Commonly Used in:

• Portable Devices: Used in smartphones, tablets, and wearable electronics where battery life is a priority.
• IoT and Wireless Modules: Provides stable 3.3V for Bluetooth, Wi-Fi (ESP32/ESP8266), and Zigbee transceiver modules.
• Microcontroller Power Rails: Supplies the primary operating voltage for popular 3.3V microcontrollers (e.g., ARM Cortex-M series).

Applications:

• Low-Power Sensor Systems: Regulating power for precision analog sensors and data acquisition systems.
• Post-Regulation in DC/DC Systems: Filtering ripple and stabilizing voltage following a switching converter.
• Powering Logic Circuits: Providing a clean, stable 3.3V supply for logic gates and digital ICs in embedded designs.

Equivalent Models:

• NCP1117-3.3V (ON Semi): A widely used 3.3V LDO, however, the RT9193 offers lower dropout voltage and quiescent current.
• LM1117-3.3V (Texas Instruments): A common industry standard, although the RT9193 is preferred for low-power and battery-operated applications due to its superior efficiency.
• S-812C33AMC (Seiko): A similar low-current LDO in an SOT-23-5 package with a 3.3V output.

Package Includes:

• 1 x RT9193-33GB LDO 3.3V 300mA Voltage Regulator SOT23-5