Analog DevicesLT8342RV#TRMPBFDC/DC-Wandler und Spannungsregler-Chip

LT8342: 40V, 9A, Low IQ Synchronous Step-Up Silent Switcher with Input Disconnect and PassThru

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 LT8342’s wide input/output voltage range, low VIN pin quiescent current in Burst Mode operation, and 100% duty cycle capability for the synchronous MOSFET in PassThru operation (V_IN ≥ V_OUT) make it ideally suited for general-purpose step-up and automotive Pre- Boost applications.

To reduce V_OUT quiescent 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.

Key Features and Benefits

• •  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 V_IN Pin Quiescent Current:
• •  350nA In Shutdown; 9μA In Burst Mode; 12μA In PassThru™ (V_IN ≥ V_OUT)
• •  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

Applications

• •  Automotive and Industrial Power Supplies
• •  General Purpose Step-Up

Evaluation Board

The LT8342 can be evaluated with the EVAL-LT8342-AZ.

Block Diagrams and Tables