The LTC3529 current-mode synchronous-boost dc-dc converter from Linear Technology Corp. features automatic overload fault detection. Its USB OTG-specific (On-the-Go) protection circuit includes a fault flag that can be programmed to latch off or restart after a timeout duration when the bus is overloaded. Also, its internal 1.5-A switches can deliver up to 500 mA of output current to a fixed 5-V output from a single-cell lithium-ion (Li-ion) battery.

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The converter’s 1.8- to 5.25-V input voltage range suits the LTC3529 for Li-ion/polymer or multicell alkaline/nickel-cadmium/nickel-metal-hydride applications. Synchronous rectification enables efficiencies of up to 95%, providing extended battery run-time in handheld applications. The combination of a 2- by 3-mm DFN-8 package and a constant switching frequency of 1.5 MHz minimize both inductor and capacitor sizes, providing a tiny solution footprint required in handheld applications.

The LTC3529 uses internal switches with an R_DS(ON) of only 90 mΩ (N-channel) and 120 mΩ (P-channel) to deliver efficiencies as high as 95%. Its output disconnect allows the output to be completely disconnected in shutdown and limits the inrush of current during startup, 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.

Available from stock in an eight-lead dual flat no-lead (DFN) package, the LTC3529EDCB starts at $2.05 each in 1000-piece lots.

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