LT8342 Series

40V, 9A, Low IQ Synchronous Step-Up Silent Switcher with Input Disconnect and PassThru

Catalog

40V, 9A, Low IQ Synchronous Step-Up Silent Switcher with Input Disconnect and PassThru

Part	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Topology	Mounting Type	Duty Cycle (Max) [Max]	Function	Package / Case	Supplier Device Package	Synchronous Rectifier	Output Type	Number of Outputs	Output Configuration	Control Features	Output Phases	Operating Temperature [Max]	Operating Temperature [Min]	Clock Sync	Frequency - Switching [Max]	Frequency - Switching [Min]
Analog Devices LT8342RV#PBF	40 V	2.8 V	Boost	Surface Mount	100 %	Step-Up	24-TFQFN Exposed Pad	24-LQFN (4x4)		Transistor Driver	1	Positive	Enable Frequency Control Power Good Pulse Skipping Ramp Soft Start	1	150 °C	-40 °C		3 MHz	300 kHz
Analog Devices LT8342RV#TRPBF	40 V	2.8 V	Boost	Surface Mount	100 %	Step-Up	24-TFQFN Exposed Pad	24-LQFN (4x4)		Transistor Driver	1	Positive	Enable Frequency Control Power Good Pulse Skipping Ramp Soft Start	1	150 °C	-40 °C		3 MHz	300 kHz

Catalog

40V, 9A, Low IQ Synchronous Step-Up Silent Switcher with Input Disconnect and PassThru

Key Features

• Silent Switcher™ Architecture

• Ultralow EMI Emissions

• Optional Spread Spectrum Frequency Modulation

• Integrated 40V, 9A Power Switches

• Output Short Protection/Inrush Current Reduction

• Wide Input Voltage Range: 2.8V to 40V

• Output Voltage Programmable up to 36V

• Optional 2 Pins select 21 output voltages

• Low VINPin Quiescent Current:

• 350nA In Shutdown; 9μA In Burst Mode; 12μA In PassThru™ (VIN≥ VOUT)

• 100% Duty Cycle Capability

• Adjustable and Synchronizable: 300kHz to 3MHz

• Pulse-Skipping or Burst Mode at Light Load

• Output Soft-Start and Power Good Monitoring

• Small 24-Lead (4mm × 4mm) LQFN Package

Description

The LT®8342 is a low IQ, synchronous step-up DC/DC converter. It features a Silent Switcher architecture and optional spread spectrum frequency modulation to minimize electromagnetic interference (EMI) emissions while delivering high efficiencies at high switching frequencies. Output short circuit protection and inrush current reduction are optional.The wide input/output voltage range, low VINpin quiescent current in Burst Mode operation, and 100% duty cycle capability for the synchronous MOSFET in PassThru operation (VIN≥ VOUT) make the LT8342 ideally suited for general-purpose step-up and automotive Pre- Boost applications.To reduce VOUTquiescent current in the feedback loop, an optional internal resistor divider (≥10MΩ) and two pins select 21 output voltage levels.The LT8342 integrates 40V, 9A power switches, operating at a switching frequency programmable between 300kHz and 3MHz and synchronizable to an external clock. The LT8342 features a programmable output soft-start, output power good flag, and output overvoltage lockout.APPLICATIONSAutomotive and Industrial Power SuppliesGeneral Purpose Step-Up