LT8350S Series

40VIN, 18VOUT, 6A Synchronous Buck-Boost Silent Switcher®2

Catalog

40VIN, 18VOUT, 6A Synchronous Buck-Boost Silent Switcher®2

Part	Number of Outputs	Package / Case	Function	Voltage - Output (Max) [Max]	Output Type	Voltage - Input (Min) [Min]	Supplier Device Package	Mounting Type	Topology	Synchronous Rectifier	Frequency - Switching [Max]	Frequency - Switching [Min]	Current - Output	Operating Temperature [Min]	Operating Temperature [Max]	Output Configuration	Voltage - Output (Min/Fixed)	Qualification	Grade
Analog Devices LT8350SAV#PBF	1	32-TFQFN Exposed Pad 28 Leads	Step-Up/Step-Down	18 V	Adjustable	3 V	32-LQFN (6x4)	Surface Mount	Buck-Boost		2 MHz	200 kHz	6 A	-40 °C	125 ¯C	Positive	1 V
Analog Devices LT8350SAV#WPBF	1	32-TFQFN Exposed Pad 28 Leads	Step-Up/Step-Down	18 V	Adjustable	3 V	32-LQFN (6x4)	Surface Mount	Buck-Boost		2 MHz	200 kHz	6 A	-40 °C	125 ¯C	Positive	1 V	AEC-Q100	Automotive

Catalog

40VIN, 18VOUT, 6A Synchronous Buck-Boost Silent Switcher®2

Key Features

• 4-Switch Single Inductor Architecture Allows VINAbove, Below or Equal to VOUT

• Silent Switcher®2 Architecture for Low EMI

• Up to 95% Efficiency at 2MHz

• Proprietary Peak Current Mode

• 3V to 40V Input Voltage Range

• 1V to 18V Output Voltage Range;

• ±1.5% Output Voltage Regulation

• Output/Input Current Regulation and Monitor

• Constant-voltage/Constant-current Regulation

• High-Side PMOS Load Switch Driver

• No Top MOSFET Refresh Noise in Buck or Boost

• 200kHz to 2MHz Fixed Switching Frequency with External Frequency Synchronization and SSFM

• VOUTDisconnected from VINDuring Shutdown

• Small 4mm × 6mm 32-Pin LQFN Package

• AEC-Q100 Qualified

Description

The LT8350S is a monolithic 4-switch synchronous buck-boost converter with second-generation Silent Switcher architecture to minimize electromagnetic interference (EMI) emissions while delivering high efficiency at high switching frequency. The switcher can regulate the output voltage, input or output current from input voltages above, below, or equal to the output voltage. The proprietary peak current mode control scheme allows for the synchronization and adjustment of 200kHz to 2MHz fixed frequency operation or spread spectrum frequency modulation (SSFM) operation. With a 3V to 40V input voltage range, 1V to 18V output voltage capability, and seamless low noise transitions between operation regions, the LT8350S is ideal for voltage regulator, battery, and super-capacitor charger applications in automotive, industrial, telecom, and battery-powered systems.The LT8350S provide an input or output current monitor and power good flag. Robust fault protection is provided to detect output short-circuit conditions, during which the LT8350S retries, latches off, or keeps running.ApplicationsAutomotive, Industrial, Telecom SystemsVoltage Regulator with Accurate Current LimitHigh-Frequency Battery-Powered SystemUSB Power Delivery (USB-PD) Source