LT8495EUF#PBF

LT8495EUF#PBF is an adjustable frequency (250KHz to 1.5MHz) monolithic switching regulator with a power-on reset and watchdog timer. Quiescent current can be less than 9µA when operating and is approximately 0.3µA when SWEN, WDE, and RSTIN are low. Configurable as a SEPIC, boost, or flyback converter, the low ripple Burst Mode operation maintains high efficiency at low output current while keeping output ripple below 10 mV. Dual supply pins (VIN and BIAS) allow the part to automatically operate from the most efficient supply. The input supply voltage can be up to 60V for SEPIC topologies and up to 32V (with ride-through up to 60V) for boost and flyback topologies. After start-up, battery life is extended since the part can draw current from its output (BIAS) even when VIN voltage drops below 2.5V. The reset and watchdog timeout periods are independently adjustable using external capacitors. Applications include automotive ECU power and power for portable products, industrial supplies.

• Wide input voltage range from 1V to 60V (2.5V to 32V for start-up)
• Reduces minimum supply voltage to ~1V after start-up to extend battery life
• Programmable watchdog timer can operate when VIN supply is removed
• Programmable power-on reset timer (POR) with active-low RST functional for input supply down to 1.3V
• Fixed frequency PWM, SEPIC/BOOST/FLYBACK topologies, soft-start programmable with one capacitor
• UVLO programmable on SWEN and active-low RSTIN pins
• Switching frequency is 1MHz typ at (RT=68.1K), switch VCESAT is 340mV typ at (ISW=1.2A)
• Quiescent current from VIN is 0.3µA typ at (VSWEN=0V, VWDE=0V, active-low VRSTIN=0V, TA=25°C)
• Switch leakage current is 0.01μA typical at (VSW=12V, VSWEN=0V, TA=25°C)
• Operating junction temperature range from -40°C to 125°C, 20-lead plastic QFN package

注释

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party