Analog Devices Inc. LT8640A Step-Down Regulators

Analog Devices Inc. LT8640A Step-Down Regulators are designed with Silent Switcher^® architecture to minimize EMI emissions and to spread spectrum frequency modulation. These regulators deliver high efficiency at frequencies up to 3MHz and offer an ultralow 2.5µA quiescent current. The LT8640A regulators can operate in different modes including burst mode, spread spectrum mode, synchronization to an external clock, and forced continuous mode of operations. These synchronous step-down regulators allow high V_IN to low V_OUT conversion at high frequency with a fast minimum switch-on time of 30ns. The LT8640A regulators are ideally used in applications that require high efficiency at very small load currents including automotive and industrial supplies.

Features

Silent Switcher^® architecture:
- Ultralow EMI emissions
- Spread spectrum frequency modulation
High efficiency at high frequency:
Up to 96% efficiency at 1MHz, 12V_IN to 5V_OUT
Up to 95% efficiency at 2MHz, 12V_IN to 5V_OUT
3.4V to 42V wide input voltage range
5A maximum continuous and 8A peak transient output
Ultralow Quiescent Current Burst Mode^® operation
- 2.5µA I_Q regulating 12V_IN to 3.3V_OUT
- Output ripple <10mV_P-P
100mV low dropout voltage at 1A under all conditions

30ns fast minimum switch on-time
Available in fixed 3.3V output
Forced continuous mode
Safely tolerates high reverse current
Adjustable and synchronizable 200kHz to 3MHz frequency range
Peak current mode operation
Output soft-start and tracking
Small 18-Lead 3mm x 4mm side solderable QFN with improved solder joint reliability
AEC-Q100 qualified for automotive applications

Applications

Automotive supplies
Industrial supplies
General purpose step-down

Analog Devices Inc. LT8640A Step-Down Regulators

Features

Applications

Typical Application Circuit

Block Diagram

Efficiency vs Load Current

husseinkey ELECTRONICS®

COMPANY