The LTC3789 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The constant-frequency, current mode architecture allows a phase-lockable frequency of up to 600kHz, while an output current feedback loop provides support for battery charging. With a wide 4V to 38V (40V maximum) input and output range and seamless, low noise transitions between operating regions, the LTC3789 is ideal for automotive, telecom and battery-powered systems. The operating mode of the controller is determined through the MODE/PLLIN pin. The MODE/PLLIN pin can select between pulse-skipping mode and forced continuous mode operation and allows the IC to be synchronized to an external clock. Pulse-skipping mode offers high efficiency and low ripple at light loads, while forced continuous mode operates at a constant frequency for noise-sensitive applications. A PGOOD pin indicates when the output is within 10% of its designed set point. The LTC3789 is available in low profile 28-pin 4mm × 5mm QFN and narrow SSOP packages. Applications * Automotive Systems * Distributed DC Power Systems * High Power Battery-Operated Devices * Industrial Control * Single Inductor Architecture Allows VIN Above, Below or Equal to the Regulated VOUT * Programmable Input or Output Current * Wide VIN Range: 4V to 38V * 1% Output Voltage Accuracy: 0.8V < VOUT < 38V * Synchronous Rectification: Up to 98% Efficiency * Current Mode Control * Phase-Lockable Fixed Frequency: 200kHz to 600kHz * No Reverse Current During Start-Up * Power Good Output Voltage Monitor * Internal 5.5V LDO * Quad N-Channel MOSFET Synchronous Drive * VOUT Disconnected from VIN During Shutdown * True Soft-Start and VOUT Short Protection, Even in Boost Mode * Available in 28-Lead QFN (4mm × 5mm) and 28-Lead SSOP Packages https://elecena.pl/product/1242977/high-efficiency-synchronous-4-switch-buck-boost-controller 2010-12-11 https://elecena.pl/product/1242977/high-efficiency-synchronous-4-switch-buck-boost-controller 2017-10-12 https://elecena.pl/product/1242977/high-efficiency-synchronous-4-switch-buck-boost-controller 2025-01-18