Synchronous rectification provides up to 95% efficiency, while Burst Mode® operation keeps quiescent current below 3µA under no-load conditions. Its 3.4V to 42V input voltage range makes it ideal for automotive and industrial applications. High-efficiency internal switches deliver up to 6A of continuous output current with input voltages as low as 0.97V. An internal current-sensing amplifier with monitoring and control pins provides precise input/output current ratio and limiting. The
LT8613's Burst Mode operation delivers ultra-low quiescent current, making it well-suited for applications such as automotive "always-on" systems requiring long battery runtime. The LT8613's unique design maintains a minimum de-excitation voltage of only 250mV at 3A under all conditions, allowing it to excel in environments such as automotive cold starts. Furthermore, a fast conduction time of only 40ns allows the constant 2MHz frequency to switch 16V input to 1.5V output, enabling designers to optimize efficiency and avoid noise-sensitive critical frequency bands. The LT8613's 3mm x 6mm, 28-pin QFN package and high switching frequency allow for small external inductors and capacitors, resulting in a compact and thermally efficient design.
The LT8613 utilizes high-efficiency internal power switches on the top and bottom, with the corresponding boost diode, oscillator, control circuitry, and logic all integrated onto a single semiconductor chip. Low-ripple burst mode operation maintains high efficiency with low output currents, achieving output ripple of less than 10mVP-P. Special design techniques and a new high-speed manufacturing process enable high efficiency across a wide input voltage range, and the LT8613's current-mode topology allows for fast transient response and excellent loop stability. It also incorporates features such as internal compensation, a power-on indicator, soft start/output tracking, and thermal protection.
The LT8613EUDE is supplied in a 3mm x 6mm QFN package and is priced at $5.51 per unit. An industrial-temperature version, the LT8613IUDE, is tested and guaranteed to operate at junction temperatures from -40°C to 125°C.

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