Converters can be configured as boost, SEPIC or inverting
The LT8570 and LT8570-1, current mode, fixed frequency step-up DC/DC converters, have been announced by Linear Technology. The LT8570 uses an internal 500mA, 65V switch, whereas the LT8570-1 uses a 250mA, 65V switch. Both devices operate from an input voltage range of 2.55-40V, making them suitable for applications with input sources ranging from a single-cell Li-Ion to automotive inputs.
Both the LT8570 and LT8570-1 can be configured as a boost, SEPIC or inverting converter. The LT8570-1’s smaller switch enables the use of a smaller inductor in lower current applications. Both parts offer a programmable switching frequency between 200kHz and 1.5MHz, enabling designers to minimise external component sizes. The combination of a small package and tiny externals ensures a very compact footprint while minimising solution cost.
The LT8570 and LT8570-1 use internal high efficiency switches, which deliver efficiencies up to 86%. Undervoltage lockout is user adjustable for optimal system performance. A single feedback resistor sets the output voltage, minimising external components. Other features include external synchronisation capability, internal soft-start, thermal shutdown protection and the ability to work in inverting and SEPIC applications.
The LT8570/-1 is available in both a 3x3mm DFN-8 and a thermally enhanced MSOP-8 package. Two temperature grades are available, with operation from -40 to +125°C (junction) for the extended and industrial grades. Pricing starts at $2.25 each in 1,000 unit quantities. Both versions are available from stock.
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