1-A synchronous buck-boost DC/DC converter delivers extended battery run time for Li-Ion and alkaline-powered devices
The latest generation single inductor buck-boost pulse width modulation (PWM) topology incorporated in the LTC3536 provides a continuous transition through all of the operating modes, making it ideal for noise-sensitive applications that must maintain a constant output voltage even as the battery voltage declines below the output. In many cases, this can increase battery run time 25% versus a buck regulator.
The LTC3536’s switching frequency is user programmable from 300 kHz to 2 MHz and can be synchronized to a system clock, optimizing the trade-off between efficiency and external component size. The combination of 1% output voltage accuracy, low noise, tiny externals and a 3 mm x 3 mm DFN package provides a small solution footprint, typically required in many handheld RF and precision measurement applications.
The LTC3536 includes two N-channel MOSFETs and two P-channel MOSFETs (R DS(ON) of 0.06 Ohm and 0.08 Ohm, respectively) to deliver efficiencies up to 95%. Burst Mode operation is user programmed to improve efficiency at light loads and requires only 28 uA of quiescent current. Shutdown current is less than 1 uA, further extending battery run time. Other features include soft-start, short circuit protection, current limiting and thermal shutdown.
LTC3536 is available from stock in thermally enhanced 10-lead 3mm x 3mm DFN and 12-lead MSOP packages in both E and I grades. Pricing starts at $2.75 each in 1,000-piece quantities.
More information about the LTC3536 synchronous buck-boost converter at www.linear.com/product/LTC3536.
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