LT8603 Series

42V, Low IQ, Quad Output Triple Monolithic Buck Converter and Boost Controller

Catalog

42V, Low IQ, Quad Output Triple Monolithic Buck Converter and Boost Controller

Part	Function	Output Phases	Control Features	Supplier Device Package	Synchronous Rectifier	Operating Temperature [Min]	Operating Temperature [Max]	Topology	Output Type	Number of Outputs	Output Configuration	Mounting Type	Package / Case	Clock Sync	Frequency - Switching [Min]	Frequency - Switching [Max]
Analog Devices LT8603EUJ#PBF	Step-Up/Step-Down	2	Current Limit Power Good Soft Start	40-QFN (6x6)		-40 °C	125 ¯C	Buck-Boost	Transistor Driver	4	Positive	Surface Mount	40-WFQFN Exposed Pad		250 kHz	2.2 MHz
Analog Devices LT8603JUJ#TRPBF	Step-Up/Step-Down	2	Current Limit Power Good Soft Start	40-QFN (6x6)		-40 °C	150 °C	Buck-Boost	Transistor Driver	4	Positive	Surface Mount	40-WFQFN Exposed Pad		250 kHz	2.2 MHz

Catalog

42V, Low IQ, Quad Output Triple Monolithic Buck Converter and Boost Controller

Key Features

• Flexible Power Supply System Capable of Four Regulated Outputs with VBATT<< VOUT

• Two High Voltage Synchronous Buck Regulators3V to 42V Input Voltage RangeOutput Currents Up to 2.5A and 1.5A

• 3V to 42V Input Voltage Range

• Output Currents Up to 2.5A and 1.5A

• One Low Voltage Synchronous Buck Regulator2.6V to 5.5V Input Voltage RangeOutput Currents Up to 1.8A

• 2.6V to 5.5V Input Voltage Range

• Output Currents Up to 1.8A

• One Boost Controller Allows Buck Converters to Regulate with VBATT<< VOUT

• Selectable Burst Mode®Operation Allows Low 28µA IQwith High Voltage Channels Active

• Programmable Power-On Reset

• Individual Channel Power Good Indicators

• Step-Down Switching Frequency: 250kHz to 2.2MHz

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

• AEC-Q100 Qualified for Automotive Applications

Description

The LT®8603 is a highly flexible, quad output regulator combining two high input voltage capable monolithic step-down switching regulators, one low input voltage capable monolithic step-down regulator, and a boost controller to satisfy a wide range of applications while occupying minimal board space.With the boost controller configured to supply the chip VINsupply, the LT8603 produces three precisely regulated outputs even when the boost input voltage falls significantly below the regulated output voltages, such as during an automotive cold crank scenario. Alternatively, with the boost controller driven from one of the step-down regulator outputs or configured as a SEPIC, the LT8603 provides four precisely regulated outputs over a wide input voltage range.The LT8603 provides robust regulation by including a cycle-by-cycle current limit for all step-down regulators, thermal shutdown, and a boost controller that can tolerate reverse battery connections and negative transient input voltages down to –42V.ApplicationsAutomotive Stop-Start and Cold Crank Ride ThroughLast-Gasp CPU Power Hold-UpIndustrial Controls and Power Supplies