AP61100Z6-7 1A Synchronous Step-Down Converter (2.3-5.5V, SOT-563)

Eliminate overheating issues on your densely packed PCBs with the AP61100Z6-7 synchronous step-down (buck) converter. When dropping a 5V source (like USB power or a drone's 5V BEC) down to 3.3V to power microcontrollers and RF chips, traditional LDO regulators waste a lot of energy as heat. This advanced switching regulator solves that problem by delivering up to 1A of continuous current with incredibly high efficiency, making it the go-to power IC for custom ExpressLRS receivers, flight controllers, and portable IoT devices.

Perfectly suited for 1S LiPo/Li-ion applications, it operates flawlessly from 2.3V to 5.5V. What makes the AP61100 truly shine is its ultra-high 2.2MHz switching frequency. This allows you to use a physically microscopic inductor and tiny ceramic capacitors, keeping your overall power circuit footprint incredibly small. Housed in a tiny 6-pin SOT-563 package and drawing a mere 15µA of quiescent current, it is the ultimate highly-efficient power solution for space-constrained, battery-operated DIY electronics.

Key Features:

• LDO Replacement: Offers significantly higher efficiency and drastically less heat generation compared to standard linear regulators when stepping down 5V to 3.3V or 1.8V.

• 1S LiPo Ready: The 2.3V to 5.5V input range makes it perfect for directly powering 3.3V logic from a single-cell (1S) LiPo battery commonly used in TinyWhoop drones.

• Space-Saving Design: The 2.2MHz switching frequency allows for the use of ultra-small external components, saving crucial PCB real estate.

• Ultra-Low Quiescent Current: Draws only 15µA in standby, maximizing battery life for portable and always-on electronics.

Specifications:

• Part Number: AP61100Z6-7

• IC Type: Synchronous Step-Down (Buck) DC-DC Converter

• Input Voltage Range: 2.3V to 5.5V

• Output Voltage: Adjustable (0.6V to 3.6V)

• Max Output Current: 1A

• Package Type: SOT-563 (1.6 x 1.6 mm, SMD/SMT)