LT8602 Series

42V Quad Monolithic Synchronous Step-Down Regulator

Catalog

42V Quad Monolithic Synchronous Step-Down Regulator

Part	Voltage - Output (Min/Fixed)	Function	Output Type	Supplier Device Package	Voltage - Input (Min) [Min]	Topology	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Output (Max) [Max]	Mounting Type	Current - Output	Package / Case	Number of Outputs	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Configuration	Voltage - Input (Max) [Max]
Analog Devices LT8602IUJ#PBF	0.8 V 1 V	Step-Down	Adjustable	40-QFN (6x6)	2.6 V	Buck	-40 °C	125 ¯C	42 V	Surface Mount	1.5 A 1.8 A 2.5 A	40-WFQFN Exposed Pad	4	250 kHz	2.2 MHz	Positive	42 V
Analog Devices LT8602EUJ#TRPBF	0.8 V 1 V	Step-Down	Adjustable	40-QFN (6x6)	2.6 V	Buck	-40 °C	125 ¯C	42 V	Surface Mount	1.5 A 1.8 A 2.5 A	40-WFQFN Exposed Pad	4	250 kHz	2.2 MHz	Positive	42 V
Analog Devices LT8602ILXE#PBF	0.8 V 1 V	Step-Down	Adjustable	48-eLQFP (7x7)	2.6 V	Buck	-40 °C	125 ¯C	42 V	Surface Mount	1.5 A 1.8 A 2.5 A	48-LQFP Exposed Pad	4	250 kHz	2.2 MHz	Positive	42 V

Catalog

42V Quad Monolithic Synchronous Step-Down Regulator

Key Features

• Flexible Power Supply System Providing Four Outputs with a Wide Input Range

• Two High Voltage Synchronous Buck Regulators:3V to 42V Input Voltage RangeOutput Currents Up to 2.5A and 1.5AHigh Efficiency Up to 93%

• 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

• Programmable Power-On Reset

• Power Good Indicators

• Resistor Programmable and Synchronizable 250kHz to 2.2MHz Switching Frequency

• Low Ripple Burst Mode®Operation:

• 30μA IQat 12VIN

• Output Ripple < 15mV

• 2-Phase Clock Reduces Input Current Ripple

• Available in Thermally Enhanced 40-Lead QFN (6mm × 6mm) Package

• AEC-Q100 Qualified for Automotive Applications

Description

The LT8602 is a quad 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 250kHz to 2.2MHz. The LT8602 can be configured for micropower Burst Mode operation or pulse-skipping operation at light load. Micropower operation results in quiescent current of 30μA with all four regulators operating in the application below.The high voltage channels are synchronous buck regulators that operate from an input of 3V to 42V. The output currents are up to 1.5A (OUT1) and 2.5A (OUT2). The low voltage channels operate from an input of 2.6V to 5.5V. Internal synchronous power switches provide high efficiency with output currents up to 1.8A. The LT8602 uses a 2-phase clock with channels 1 and 3 operating 180° from channels 2 and 4 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 protectionThe LT8602 is available in either a 40-lead 6mm × 6mm QFN or a 48-Lead 7mm × 7mm LQFP package.APPLICATIONSAutomotive SystemsDistributed Supply RegulationIndustrial Controls and Power Supplies