LT8640-1 Datasheet | Linear Technology

LT8640/LT8640-1 42V, 5A Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current Features DESCRIPTION n Silent Switcher® Architecture n Ultralow EMI Emissions n Spread Spectrum Frequency Modulation n High Efficiency at High Frequency n Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT n Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT n Wide Input Voltage Range: 3.4V to 42V n 5A Maximum Continuous Output, 7A Peak Transient Output n Ultralow Quiescent Current Burst Mode® Operation n 2.5µA IQ Regulating 12VIN to 3.3VOUT n Output Ripple < 10m VP-P n Fast Minimum Switch On-Time: 30ns n Low Dropout Under All Conditions: 100m V at 1A n Forced Continuous Mode (LT8640-1 Only) n Safely Tolerates Inductor Saturation in Overload n Adjustable and Synchronizable: 200k Hz to 3MHz n Peak Current Mode Operation n Output Soft-Start and Tracking n Small 18-Lead 3mm × 4mm QFN and Side Wettable QFN n AEC-Q100 Qualified for Automotive Applications APPLICATIONS n Automotive and Industrial Supplies n General Purpose Step-Down n GSM Power Supplies The LT®8640/LT8640-1 step-down regulator Features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at frequencies up to 3MHz. An ultralow 2.5µA quiescent current- with the output in full regulation- enables applications requiring highest efficiency at very small load currents. The LT8640/LT8640-1 allows high VIN to low VOUT conversion at high frequency with a fast minimum top switch on-time of 30ns. The SYNC/MODE pin selects between Burst Mode operation, spread spectrum mode, synchronization to an external clock, and either pulse-skipping (LT8640) or forced continuous mode (LT8640-1). LT8640 SYNC/ PACKAGE MODE ≠ 0 VC P Pulse Skipping Internal LT8640-1 QFN FCM Internal LT8640S LQFN FCM Internal LT8643S LQFN FCM External LT8640S-2 LQFN FCM Internal LT8643S-2 LQFN FCM External 150°C GRADE Yes Yes No No Yes Yes INTERNAL CLKOUT CAPS No No No No Yes Yes Yes Yes...