Linear Technology Corporation introduced the LT8494, a new current mode, fixed-frequency SEPIC / boost DC-DC converter with an internal 2A, 70V switch. With an ultra-low quiescent current of only 7µA, this device is ideal for normally-on-vehicle or other industrial battery-powered systems.
The LT8494 starts from an input voltage range of 2.5V to 32V. Once in operation, it can operate from an input range of 1V to 60V, making it ideal for applications with input power ranging from a single-cell lithium-ion to automotive input. The LT8494 can be configured as a boost, SEPIC or flyback converter. Its switching frequency can be programmed with a resistor between 250kHz and 1.5MHz, enabling designers to minimize the size of external components. The combination of a thermally enhanced TSSOP-20E or 4mm x 4mm QFN package with slim external components ensures a compact footprint while minimizing solution costs.
The LT8494's internal high-efficiency 2A / 70V switch operates at up to 83% efficiency in a SEPIC configuration. The unique design with dual power supply pins (VIN and BIAS) allows the device to operate from the most efficient power supply, optimizing efficiency under a variety of conditions. The LT8494 can operate at SEPIC topology input voltages up to 60V and input supply voltages of 32V, and provides ride-through protection in boost and flyback topologies. Other features include FMEA-resistant package (TSSOP-20E), power good indicator, programmable soft-start and thermal shutdown protection.
The LT8494 is available in a thermally enhanced TSSOP-20 package. Industrial grade (-40C to 125C) and high temperature (-40C to 150C) grades are also available.
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