65V, 8A Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current

The LT8645S-2 synchronous step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This performance makes the LT8645S-2 ideal for noise sensitive applications and environments.

The fast, clean, low-overshoot switching edges enable high efficiency operation even at high switching frequencies, leading to a small overall solution size. Peak current mode control with a 40ns minimum on-time allows high step-down ratios even at high switching frequencies.

Burst Mode® operation enables ultralow standby current consumption, pulse-skipping mode allows full switching frequency at lower output loads, or spread spectrum operation can further reduce EMI emissions.

Applications

*

Automotive and Industrial Supplies

* General Purpose Step-Down

* GSM Power Supplies

* Silent Switcher® Architecture

* Ultralow EMI Emissions

* Optional Spread Spectrum Modulation

*

* Up to 95% Efficiency at 1MHz, 12VIN to 5VOUT

* Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT

* Wide Input Voltage Range: 3.4V to 65V

* Ultralow Quiescent Current Burst Mode Operation

* 2.5μA IQ Regulating 12VIN to 3.3VOUT

* Output Ripple < 10mVP-P