DC/DC converter minimises external components in multi-cell battery stacks
Analog Devices offers the Power by Linear LT8361, current mode, 2.0MHz multi-topology DC/DC converter with an internal 2A, 100V switch. It is suitable for applications with input sources ranging from a single-cell Li-Ion battery to multi-cell battery stacks, automotive inputs, telecomms power supplies and industrial power rails, and operates from an input voltage range of 2.8 to 60V.
The LT8361 can be configured as either a boost, SEPIC or an inverting converter. Switching frequency can be programmed between 300kHz and 2.0MHz, enabling designers to minimise external component sizes, says Analog Devices, and avoid critical frequency bands, such as AM radio. The LT8361 offers over 90 per cent efficiency while switching at 2MHz. Burst Mode operation reduces quiescent current to only nine microA while keeping output ripple below 15mVp-p.
Packaged in a small MSOP-16E package, only tiny external components are required, due to the high switching frequency, combining to ensure a compact footprint while minimising solution cost, claims Analog Devices.
The LT8361’s 375mOhm power switch delivers efficiencies up to 95 per cent. Spread spectrum frequency modulation minimises EMI concerns and a single feedback pin sets the output voltage whether the output is positive or negative, to minimise the pin count. There is also external synchronisation, programmable under-voltage lockout, frequency foldback and programmable soft-start.
The LT8361EMSE MSOP-16E package has four pins removed for high voltage spacing). An industrial temperature (-40 to +125 degree C) version
(the LT8361IMSE) and a high temperature (-40 to +150 degree C) version (the LT8361HMSE) are also available. All versions are available from stock.
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