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reference designLT8349

Analog Devices LT8349

8V, 12A, 2-Phase Low IQ Synchronous Boost Converter

Overview

TopologyBoost Converter
Input voltage2.5-5.5 V
Switching frequency300-4000 kHz
Output 18 V / 12 A
IC revisionB

Description

The LT8349 is a 2-phase single output synchronous boost converter that drives two internal N-Channel power MOSFET stages out-of-phase. Multiphase operation reduces input and output capacitor requirements and allows the use of smaller inductors than the single-phase equivalent. Synchronous rectification increases efficiency, reduces power losses, and eases thermal requirements, enabling high power boost applications.The LT8349 features Stage Shedding and selectable Burst Mode operation at light load conditions allowing high efficiency over a wide range of load. It features optional spread spectrum frequency modulation (SSFM) to minimize EMI emissions.The LT8349 integrates 8V/6A power switches, operating at a fixed switching frequency programmable between 300kHz and 4MHz and synchronizable to an external clock. The LT8349 features output soft-start and output overvoltage lockout.

Features

Input Voltage Range: 2.5V to 5.5VOutput Voltage Programmable Up to 8V2-Phase Operation Reduces Required Input and Output Capacitance and Power Supply Induced NoiseSynchronous Operation for High Efficiency and Reduced Heat DissipationStage SheddingTM and Optional Burst Mode® Operation for High Efficiency at Light LoadLow VIN Pin Quiescent Current:0.5µA in Shutdown15µA in Burst Mode OperationIntegrated 8V/6A Synchronous Power SwitchesAdjustable and Synchronizable: 300kHz to 4MHzBurst Mode or Forced Continuous Operation at Light LoadAccurate 1V Enable Pin ThresholdSmall 1.9mm x 2.6mm WLCSP Package

Typical applications

  • Handheld and Industrial Power Supplies
  • Handheld and Industrial Power Supplies

More information

Parts approved by Analog Devices

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Data­sheet
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Product series
L(µH)
IRP,40K(A)
ISAT,30%(A)
RDC typ.(mΩ)
fres(MHz)
VOP(V)
Mount
SamplesAvailability & Sample
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744383360047
SPECWE-MAPI SMT Power Inductor, 0.47 µH, 7.55 A
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-MAPI SMT Power Inductor
Inductance0.47 µH
Performance Rated Current7.55 A
Saturation Current @ 30%9.8 A
DC Resistance18 mΩ
Self Resonant Frequency99 MHz
Operating Voltage80 V
MountSMT 
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