Analog Devices LT8602

Description

The LT®8602 is a quad channel, current mode, monolithicbuck switching regulator with a programmable power-onreset. All regulators are synchronized to a single oscillatorwith an adjustable frequency from 250kHz to 2.2MHz. TheLT8602 can be configured for micropower Burst Modeoperation or pulse-skipping operation at light load. Micropoweroperation results in quiescent current of 30μAwith all four regulators operating in the application below.The high voltage channels are synchronous buck regulatorsthat operate from an input of 3V to 42V. The outputcurrents are up to 1.5A (OUT1) and 2.5A (OUT2). Thelow voltage channels operate from an input of 2.6V to5.5V. Internal synchronous power switches provide highefficiency with output currents up to 1.8A. The LT8602uses a 2-phase clock with channels 1 and 3 operating 180°from channels 2 and 4 to reduce input ripple current onboth HV and LV inputs. All channels have cycle-by-cyclecurrent limit, providing protection against shorted outputs.Thermal shutdown provides additional protection.The LT8602 is available in a 40-lead 6mm × 6mm QFNpackage.

Features

• Flexible Power Supply System Providing Four Outputs with a Wide Input Range
• Two High Voltage Synchronous Buck Regulators:
• 3V to 42V Input Voltage Range
• Output Currents Up to 2.5A and 1.5A
• High Efficiency Up to 93%
• Two Low Voltage Synchronous Buck Regulators:
• 2.6V to 5.5V Input Voltage Range
• Output Currents Up to 1.8A and 94% Efficiency
• Resistor Programmable and Synchronizable 250kHz to 2.2MHz Switching Frequency
• Low Ripple Burst Mode® Operation:
• 30μA IQ at 12VIN
• Output Ripple < 15mV
• Programmable Power-On Reset
• Power Good Indicators
• 2-Phase Clock Reduces Input Current Ripple
• Available in Thermally Enhanced 40-Lead QFN (6mm × 6mm) Package

Remarks

• Several Vendors and Suitable Inductor series available page no-15

Typical applications

• Distributed Supply Regulation
• Automotive Systems
• Industrial Controls and Power Supplies

More information

• Datasheet
• IC product information