8V, 16A Synchronous Step-Down Silent Switcher 2

The LT8644S synchronous step-down regulator features second generation Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes the integration of bypass capacitors to optimize all the fast current loops inside and make it easy to achieve advertised EMI performance by eliminating layout sensitivity.

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 20ns minimum on-time allows high step down ratios even at high switching frequencies. External compensation via the VC pin allows for fast transient response. PolyPhase operation allows multiple LT8644S regulators to run with interleaving phase shift to provide more output current.

Burst Mode operation enables low standby current consumption, forced continuous mode can control frequency harmonics across the entire output load range, or spread spectrum operation can further reduce EMI emissions. Soft-start and tracking functionality is accessed via the SS pin, and an accurate input voltage UVLO threshold can be set using the EN/UV pin.

APPLICATIONS

* Automotive and Industrial Supplies

* General Purpose Step-Down Conversion

* Silent Switcher®2 Architecture

* Ultralow EMI Emissions on Any PCB

* Internal Bypass Capacitors Reduce Radiated EMI

* Optional Spread Spectrum Modulation

* High Efficiency at High Frequency

* Up to 94% Efficiency at 2MHz, 3.3VIN to 1.2VOUT

* Up to 93% Efficiency at 2MHz, 5VIN to 1.2VOUT

* PVIN Range: 1.5V to 8V, SVIN Range: 2.7V to 8V

* VOUT Range: 0.6V to VIN

* Reference Accuracy: ±0.8% Over Temperature