Step-down switching regulator offers 93% efficiency

Its synchronous rectification topology delivers up to 93% efficiency while Burst Mode operation keeps quiescent current under 30µA (all channels) in no-load standby conditions, making it suitable for always-on systems. For noise-sensitive applications, the LT8602 utilises its pulse-skipping mode to minimise switching noise and meet the CISPR25, Class 5 EMI requirements. Switching frequency can be programmed from 250kHz to 2.2MHz and is synchronisable throughout this range.

The LT8602’s 60ns minimum on-time enables 16V_IN to 0.8V_OUT step-down conversions while switching at 2MHz, enabling designers to avoid critical noise-sensitive frequency bands such as AM radio, while using a very compact solution footprint. Its 3-42V input voltage range meams it suits automotive applications that must regulate through cold-crank and stop-start scenarios with minimum input voltages as low as 3V and load dump transients in excess of 40V.

Each channel of the LT8602 maintains a minimum dropout voltage of only 200mV (at 1A) under all conditions, enabling it to excel in scenarios such as automotive cold-crank. Programmable power-on reset and power good indicators for each channel ensure overall system reliability.  The LT8602’s 40-lead thermally enhanced 6mm x 6mm QFN package and high switching frequency keep external inductors and capacitors small, providing a compact, thermally efficient footprint.

The LT8602 utilises quad internal top and bottom high efficiency power switches with the necessary boost diodes, oscillator, control and logic circuitry integrated into a single die. Channel 1 and 3 switch 180° out of phase with channels 2 and 4 to reduce output ripple. Each channel has a separate input for added design flexibility, but most applications will run the two low voltage channels directly from the two high voltage channels to provide a very simple, high frequency quad output design.

Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV_P-P. Unique design techniques and a new high speed process enable high efficiency over a wide input voltage range, and the LT8602’s current-mode topology enables fast transient response and excellent loop stability. Other features include internal compensation, power good flags, output soft-start/tracking, short-circuit and thermal protection.

The LT8602 is available in a thermally enhanced 40-lead 6mm² QFN package. Three temperature grades are available, with operation from –40°C to 125°C (junction) for the extended E- and industrial I-grades. The 1,000 piece price starts at $5.67 each. All versions are available from stock.