Dual regulator has core and I/O voltages covered

Combination of a high switching frequency and a 4 x 4mm QFN package ensures a very compact power system footprint for handheld applications.

New from Linear Technology, the LTC3520 is a dual-channel 2MHz synchronous convertor.

One channel uses a synchronous buck-boost topology which can deliver up to 1A of continuous output current with inputs above, equal, or below the output.

In single cell Li-ion applications requiring a 3.3V output, the buck-boost topology can enable over 25% longer battery run-times compared with a standard buck convertor.

The second channel is a synchronous buck regulator which can deliver up to 600mA of continuous output current to voltages as low as 0.8V.

An uncommitted gain block can be configured as an LDO or a battery-good comparator.

This combination is ideal for powering applications such as DSPs/microcontrollers that require both a 3.3V I/O rail and a 0.8-1.8V rail for the core voltage.

The LTC3520 operates from 2.2 to 5.5V inputs while switching frequency is user programmable between 100kHz and 2MHz, enabling designers to maximise efficiency while keeping externals small.

The combination of its high switching frequency and a 4 x 4mm QFN package ensures a very compact power system footprint for handheld applications.

The LTC3520's unique synchronous buck-boost topology on its 1A channel enables it to regulate a constant output voltage when the input voltage is above, equal to or below the output, enabling complete use of the Li-ion battery's stored energy.

The LTC3520 uses automatic Burst Mode operation to offer only 55uA (both channels) of no load quiescent current.

For applications requiring very low noise, the Burst Mode operation can be defeated and replaced with a forced continuous mode.

Shutdown current is less than 1uA, further extending battery life.

Each channel has independent internal soft-start, enabling design flexibility.

Other features include short-circuit protection and overtemperature protection.

LTC3520EUF is available from stock in a 24-lead QFN package.

Pricing is US $3.50 each for 1000-piece quantities.

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