LT8601 Datasheet | Linear Technology

Features nn Flexible Power Supply System Providing Three Outputs Over a Wide Input Voltage Range nn Two High Voltage Synchronous Buck Regulators nn 3V to 42V Input Voltage Range nn Output Currents Up to 2.5A and 1.5A nn High Efficiency Up to 93% nn One Low Voltage Synchronous Buck Regulator nn 2.6V to 5.5V Input Voltage Range nn Output Current Up to 1.8A and 95% Efficiency nn Resistor Programmable and Synchronizable from 250k Hz to 2.2MHz Switching Frequency nn Low Ripple Burst Mode® Operation nn 30µA IQ at 12VIN to 3.3VOUT2 nn Output Ripple < 15m V nn Programmable Power-On Reset nn Power Good Indicators nn 2-Phase Clock Reduces Input Current Ripple nn Available in Thermally Enhanced 40-Lead QFN (6mm × 6mm) Package APPLICATIONS nn Automotive Systems nn Distributed Supply Regulation nn Industrial Controls and Power Supplies 42V Triple Monolithic Synchronous Step-Down Regulator DESCRIPTION The LT®8601 is a triple channel, current mode, monolithic buck switching regulator with a programmable power-on reset. All regulators are synchronized to a single oscillator with an adjustable frequency from 250k Hz to 2.2MHz. The LT8601 can be configured for micropower Burst Mode or Pulse-Skipping operation at light load. Micropower operation results in quiescent current of 30µA with all three regulators operating as shown in the application below with no load applied. The high voltage channels are synchronous buck regulators that operate from an input of 3.0V to 42V. The output currents are up to 1.5A (OUT1) and 2.5A (OUT2). The low voltage channel operates from an input of 2.6V to 5.5V. Internal synchronous power switches provide high efficiency with output currents up to 1.8A. The LT8601 uses a 2-phase clock with channel 1 operating 180° from channels 2 and 3 to reduce input ripple current on both HV and LV inputs. All channels have cycle-by-cycle current limit, providing protection against shorted outputs. Thermal shutdown provides additional protection. The...