LT8342

RECOMMENDED FOR NEW DESIGNS

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

Analog Devices LT8342 Product Info

10 February 2026 7

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 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

Part details & applications

The LT^®8342 is a low I_Q, 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 V_IN pin quiescent current in Burst Mode operation, and 100% duty cycle capability for the synchronous MOSFET in PassThru operation (V_IN ≥ V_OUT) make the LT8342 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.

APPLICATIONS

Automotive and Industrial Power Supplies

General Purpose Step-Up

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