Regulator keeps quiescent current under 2.5µA

Featuring a 3.0-42V input voltage range, the LT8610AC is suitable for automotive applications, which need to regulate through cold-crank/stop-start scenarios with minimum input voltages as low as 3.0V and load dump transients in excess of 40V. Up to 3.5A of continuous output current to voltages as low as 0.80V are delivered by the device’s internal 5A switches.

Offering low quiescent current through Burst Mode operation, the LT8610AC is suitable for automotive ‘always-on’ systems, which need to extend operating battery life. Allowing it to excel in conditions such as automotive cold-crank, the regulator’s design maintains a minimum dropout voltage of only 200mV at 1A under all conditions. 2MHz constant frequency switching from a 16V input to a 1.0V output is enabled by a fast minimum on-time of only 30ns, optimising efficiency while avoiding critical noise-sensitive frequency bands.

The LT8610AC, which integrates a boost diode, oscillator, control and logic circuitry into a single die, utilises internal top and bottom high efficiency power switches. While keeping output ripple below 10mVpk-pk, low ripple Burst Mode operation maintains high efficiency at low output currents. Fast transient response and loop stability is enabled by the device’s current-mode topology. Internal compensation, a power good flag, output soft start/tracking and thermal protection are also provided with the regulator.

The device’s 10-lead thermally enhanced 16-lead thermally enhanced MSOP combined with it’s high switching frequency allows for small external inductors and capacitors and, therefore, a compact, thermally efficient footprint.

The LT8610ACEMSE is available now in 1,000 unit quantities for $3.75 each. Linear Technology also offers an industrial temperature version of the regulator. The LT8610ACIMSE, which is tested and guaranteed to operate from a junction temperature range of -40 to 125°C, is sold in 1,000 unit quantities at $4.38 each.