TLV62569 3.3V Buck Converter Breakout - 3.3V Output 1.2A Max

TLV62569 3.3V Buck Converter Breakout Board - 3.4-5.5V Input, 1.2A Continuous Output, 1.5MHz Switching for LiPo, Alkaline, and USB-Powered 3.3V Circuits

The TLV62569 3.3V Buck Converter Breakout is a compact step-down voltage regulator board built around the Texas Instruments TLV62569 synchronous buck converter IC, providing a fixed 3.3V regulated output at up to 1.2A continuous current from an input voltage range of 3.4V to 5.5V. The input range directly covers the three most common low-voltage power sources used in portable and embedded electronics - LiPo and LiPoly single-cell batteries spanning their full 3.4V to 4.2V discharge range, 3-cell alkaline battery packs at approximately 4.5V nominal, and USB 5V power rails - making this breakout a practical and versatile power supply solution for 3.3V microcontroller boards, sensors, wireless modules, and peripheral circuits without requiring a separate voltage source selection or input filtering stage.

The 1.5MHz switching frequency places the converter well above the audible range and allows the use of small, low-profile passive filter components on the breakout board, contributing to the compact overall footprint. The 35uA quiescent current draw in active operation and a shutdown current below 2uA make this converter well-suited for battery-powered and energy-harvesting applications where standby and light-load power consumption directly affects battery run-time. The 100% duty cycle operation mode allows the output to follow the input when the input voltage falls close to 3.3V, extending usable battery run-time through the tail end of a LiPo discharge curve rather than cutting off regulation prematurely. Internal soft-start limits inrush current during power-up, protecting both the converter and connected load circuits from start-up current spikes, while thermal shutdown protects the IC from damage under sustained overload conditions.

Key Features

• Regulator IC: Texas Instruments TLV62569 synchronous buck converter with fixed 3.3V output
• Input Voltage Range: 3.4-5.5V covering single-cell LiPo / LiPoly batteries, 3-cell alkaline packs, and USB 5V power rails
• Output Voltage: Fixed 3.3V regulated output for direct supply to 3.3V microcontroller, sensor, and wireless module circuits
• Continuous Output Current: Up to 1.2A continuous across the full 3.4-5.5V input voltage range
• Quiescent Current: 35uA active quiescent current for efficient light-load and standby operation in battery-powered builds
• Shutdown Current: Less than 2uA shutdown current for minimal battery drain in sleep and powered-down system states
• 100% Duty Cycle Operation: Output follows input as voltage approaches 3.3V, extending usable LiPo battery run-time through the discharge tail
• Switching Frequency: 1.5MHz above the audible range, enabling compact, low-profile passive filter components on the breakout board
• Internal Soft-Start: Limits inrush current during power-up to protect the converter and connected load circuits from start-up current spikes
• Thermal Shutdown: Automatic over-temperature protection prevents IC damage under sustained overload or high-ambient-temperature conditions
• Breakout Board Format: Compact PCB with accessible input and output pads for direct breadboard, perfboard, and PCB integration

Applications

• Single-cell LiPo and LiPoly battery-powered 3.3V microcontroller and sensor builds requiring regulated supply across the full battery discharge range
• USB 5V to 3.3V step-down conversion for 3.3V peripheral and sensor circuits in USB-powered embedded projects
• 3-cell alkaline battery packs supplying 3.3V circuits in portable and field-deployed sensor nodes
• ESP8266, ESP32, and other 3.3V Wi-Fi and BLE wireless module power supply from LiPo or USB sources
• Low-power IoT sensor nodes with 35uA quiescent and sub-2uA shutdown current directly extend battery run-time
• Wearable electronics and compact embedded builds requiring a small-footprint 1.5MHz switching 3.3V regulator