Linear Tech Adds 1.5A, 1.5MHz Synchronous Boost Regulator For USB On-The-Go Applications
Linear Technology Corp. announced the LTC3529, a 1.5MHz, current mode synchronous boost dc-dc converter with automatic overload fault detection. The device’s USB OTG - specific protection circuit includes a fault flag that can be programmed to either latchoff or restart after a timeout duration when the bus is overloaded.
The LTC3529’s internal 1.5A switches can deliver up to 500mA of output current to a fixed 5V output from a single-cell Li-Ion battery. An input voltage range of 1.8 to 5.25V makes the LTC3529 well suited for Li-Ion/Polymer or multicell alkaline/NiCd/NiMH applications.
Synchronous rectification enables efficiencies of up to 95%, providing extended battery run-time in handheld applications. The combination of a 2 x 3mm DFN-8 package and a constant switching frequency of 1.5MHz minimize both inductor and capacitor sizes, providing a tiny solution footprint required in handheld applications.
The LTC3529 uses internal switches with an RDS(ON) of only 90mΩ (N-channel) and 120mΩ (P-channel) to deliver efficiencies as high as 95%. The output disconnect feature allows the output to be completely disconnected in shutdown and also limits the inrush of current during start-up, minimizing surge currents seen by the input supply. The LTC3529 will also regulate the output when the input voltage exceeds the output voltage. Additional features include anti-ringing control, short-circuit protection, soft-start and thermal protection.
The LTC3529EDCB is available from stock in an 8-lead DFN package. 1,000-piece pricing starts at $2.05 each.
