LT8601 Series

42V Triple Monolithic Synchronous Step-Down Regulator

Catalog

42V Triple Monolithic Synchronous Step-Down Regulator

Part	Topology	Supplier Device Package	Voltage - Output (Max) [Max]	Package / Case	Voltage - Input (Min) [Min]	Output Type	Mounting Type	Function	Voltage - Input (Max) [Max]	Output Configuration	Voltage - Output (Min/Fixed)	Operating Temperature [Min]	Operating Temperature [Max]	Current - Output	Number of Outputs	Frequency - Switching [Min]	Frequency - Switching [Max]
Analog Devices LT8601EUJ#TRPBF	Buck	40-QFN (6x6)	42 V	40-WFQFN Exposed Pad	2.6 V	Adjustable	Surface Mount	Step-Down	42 V	Positive	0.8 V 1 V	-40 °C	125 ¯C	1.5 A 1.8 A 2.5 A	3	250 kHz	2.2 MHz
Analog Devices LT8601JUJ#TRPBF	Buck	40-QFN (6x6)	42 V	40-WFQFN Exposed Pad	2.6 V	Adjustable	Surface Mount	Step-Down	42 V	Positive	0.8 V 1 V	-40 °C	125 ¯C	1.5 A 1.8 A 2.5 A	3	250 kHz	2.2 MHz
Analog Devices LT8601JUJ#PBF	Buck	40-QFN (6x6)	42 V	40-WFQFN Exposed Pad	2.6 V	Adjustable	Surface Mount	Step-Down	42 V	Positive	0.8 V 1 V	-40 °C	125 ¯C	1.5 A 1.8 A 2.5 A	3	250 kHz	2.2 MHz
Analog Devices LT8601EUJ#PBF	Buck	40-QFN (6x6)	42 V	40-WFQFN Exposed Pad	2.6 V	Adjustable	Surface Mount	Step-Down	42 V	Positive	0.8 V 1 V	-40 °C	125 ¯C	1.5 A 1.8 A 2.5 A	3	250 kHz	2.2 MHz

Catalog

42V Triple Monolithic Synchronous Step-Down Regulator

Key Features

• Flexible Power Supply System Providing Three Outputs Over a Wide Input Voltage Range

• Two High Voltage Synchronous Buck Regulators3V 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%

• One Low Voltage Synchronous Buck Regulator2.6V to 5.5V Input Voltage RangeOutput Current Up to 1.8A and 95% Efficiency

• 2.6V to 5.5V Input Voltage Range

• Output Current Up to 1.8A and 95% Efficiency

• Programmable Power-On Reset

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

• Low Ripple Burst Mode®Operation30μA IQat 12VINto 3.3VOUT2Output Ripple <15mV

• 30μA IQat 12VINto 3.3VOUT2

• Output Ripple <15mV

• Power Good Indicators

• 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 LT8601 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 250kHz 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 LT8601 is available in a 40-lead 6mm × 6mm QFN package.APPLICATIONSAutomotive SystemsDistributed Supply RegulationIndustrial Controls and Power Supplies