2.2 MHz Synchronous Boost Regulator with Output Disconnect and LDO in a 3 mm x 3 mm QFN
Linear Technology Corporation announced the LTC3537, a 2.2 MHz, current mode synchronous boost DC/DC converter with integrated output disconnects plus an LDO. The devices's boost converter's internal 600 mA switches can deliver output voltages as high as 5.25V from an input voltage range of 0.68V at start-up (0.5V when running) to 5V, making it suitable for Li-Ion/Polymer or single/multicell alkaline/NiMH applications. The LTC3537 can deliver up to 100mA of continuous output current (at 3.3V) from a single alkaline cell or 300mA from a dual cell input. Synchronous rectification enables efficiencies of up to 94 percent while a 2.2 MHz switching frequency minimizes the total footprint. The second channel, a 100 mA LDO, has an input range of 1.8V to 5.5V and can deliver outputs as low as 0.6V. It can be driven by either the input voltage source or the boost converter's output, providing design flexibility. The LDO channel's 100 mV dropout voltage and 24 db ripple rejection offer a compact and low noise secondary output. The device is available from stock in a 16-lead 3 mm x 3 mm QFN package. 1,000-piece pricing starts at $2.40 each.
Linear Technology Corporation