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LT8645SIV: 65V, 8A Silent Switcher® 2 Architecture Synchronous Buck Regulator with 2.5μA Quiescent Current

Overview:

The LT8645SIV synchronous buck regulator employs a second-generation ultra-low-noise switching regulator architecture, significantly reducing EMI radiation while delivering high efficiency at high switching frequencies. It includes an integrated bypass capacitor to optimise all internal fast current loops and easily achieve the advertised EMI performance by eliminating layout sensitivity.

LT8645SIV Product Features:

Silent Switcher® 2 architecture

Ultra-low EMI radiation on any PCB

Eliminates PCB layout sensitivity

Internal bypass capacitor reduces radiated EMI

Optional spread spectrum modulation

High-frequency high efficiency

Up to 95% efficiency (1MHz, 12VIN to 5VOUT)

Up to 94% efficiency (at 2MHz, 12VIN to 5VOUT)

Wide input voltage range: 3.4V to 65V

Ultra-low static current in burst mode operation

2.5μA (IQ at 12VIN to 3.3VOUT)

Output ripple < 10mVP-P

Shortest fast turn-on time: 40ns

Low dropout voltage under all conditions: 60mV (1A)  

Adjustable and synchronisable frequency range: 200kHz to 2.2MHz  

Peak current operating mode  

Output soft-start and tracking  

32-pin 6mm × 4mm small LQFN package  

LT8645SIV Applications:  

Automotive and industrial power supplies  

General-purpose buck converters  

GSM power supplies

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