Single-cell Li-Ion controller with USB and overvoltage clamp
The LTC4067EDE#PBF from Analog Devices is a multi-function controller designed for single-cell Lithium Ion/Polymer battery charging and system power management. It integrates a USB-compatible interface and built-in overvoltage fault protection, making it a compact charge-management solution for portable equipment that draws power from a USB port or a wall adapter. The part operates over the industrial temperature range of -40°C to 85°C and comes in a 12-lead WFDFN with exposed pad (4x3 mm) for thermal dissipation.
What the ratings mean for fit
The USB interface means this controller can negotiate charge current directly from a USB host or charger without an external protocol translator, simplifying the BOM for handheld devices. The overvoltage protection clamps the input rail when a faulty adapter supplies too high a voltage, saving the battery and downstream circuitry — a practical safeguard for field equipment that gets plugged into unknown supplies. The single-cell support locks the part into designs using one Li-Ion or Li-Polymer cell in series; two-cell stacks need a different controller. The exposed pad requires a thermal via pattern on the PCB to keep junction temperature under control during high-current charging.