LT8620 Datasheet | Linear Technology

Features nn Wide Input Voltage Range: 3.4V to 65V nn Ultralow Quiescent Current Burst Mode® Operation: nn 2.5μA IQ Regulating 12VIN to 3.3VOUT nn Output Ripple < 10m VP-P nn High Efficiency Synchronous Operation: nn 94% Efficiency at 1A, 12VIN to 5VOUT nn 92% Efficiency at 1A, 12VIN to 3.3VOUT nn Fast 30ns Minimum Switch-On Time nn Low Dropout Under All Conditions: 250m V at 1A nn Safely Tolerates Inductor Saturation in Overload nn Low EMI nn Adjustable and Synchronizable: 200k Hz to 2.2MHz nn Accurate 1V Enable Pin Threshold nn Internal pensation nn Output Soft-Start and Tracking nn Small Thermally Enhanced 16-Lead MSOP and 24-Lead 3mm × 5mm QFN Packages APPLICATIONS nn Automotive and Industrial Supplies nn General Purpose Step-Down nn GSM Power Supplies 65V, 2A Synchronous Step-Down Regulator with 2.5µA Quiescent Current DESCRIPTION The LT®8620 is a pact, high efficiency, high speed synchronous monolithic step-down switching regulator that accepts a wide input voltage range up to 65V, and consumes only 2.5µA of quiescent current. Top and bottom power switches are included with all necessary circuitry to minimize the need for external ponents. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10m VP-P. A SYNC pin allows synchronization to an external clock. Internal pensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The EN/UV pin has an accurate 1V threshold and can be used to program VIN undervoltage lockout or to shut down the LT8620 reducing the input supply current to 1µA. A capacitor on the TR/SS pin programs the output voltage ramp rate during start-up. The PG flag signals when VOUT is within ±9% of the programmed output voltage as well as fault conditions. The LT8620 is available in small 16-Lead MSOP and 3mm × 5mm QFN packages with exposed pads for low thermal resistance. L,...