42V, 1.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current

The LT8608 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 1.7µA of quiescent current. The LT8608 can deliver 1.5A of continuous current. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mV. Internal compensation 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 LT8608. The PG flag signals when VOUT is within ±8.5% of the programmed output voltage as well as fault conditions.

The MSOP package includes a SYNC pin to synchronize to an external clock, or to select Burst Mode operation or pulse-skipping with or without spread-spectrum; the TR/SS pin programs soft-start or tracking. The DFN package omits these pins and can be purchased in pulse-skipping or Burst Mode operation varieties.

APPLICATIONS

* General Purpose Step Down

* Low EMI Step Down

* Wide Input Voltage Range: 3.0V to 42V

* Ultralow Quiescent Current Burst Mode® Operation:

* <2.5μA IQ Regulating 12VIN to 3.3VOUT

* Output Ripple <10mVP-P

* High Efficiency 2MHz Synchronous Operation:

* >92% Efficiency at 0.5A, 5VOUT from 12VIN

* 1.5A Continuous Output Current

* Fast Minimum Switch-On Time: 35ns

* Adjustable and Synchronizable: 200kHz to 2.2MHz