Analog DevicesEVAL-LT8349-BZCartes et kits de développement de gestion de la puissance

LT8349: 8V, 12A, 2-Phase Low IQ Synchronous Boost Converter

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.

Key Features and Benefits

• •  Input Voltage Range: 2.5V to 5.5V
• •  Output Voltage Programmable Up to 8V
• •  2-Phase Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise
• •  Synchronous Operation for High Efficiency and Reduced Heat Dissipation
• •  Stage SheddingTM and Optional Burst Mode® Operation for High Efficiency at Light Load
• •  Low VIN Pin Quiescent Current:
• •  0.5µA in Shutdown
• •  15µA in Burst Mode Operation
• •  Integrated 8V/6A Synchronous Power Switches
• •  Adjustable and Synchronizable: 300kHz to 4MHz
• •  Burst Mode or Forced Continuous Operation at Light Load
• •  Accurate 1V Enable Pin Threshold
• •  Small 1.9mm x 2.6mm WLCSP Package

Applications

• •  Handheld and Industrial Power Supplies

Evaluation Board

The LT8349 can be evaluated with the EVAL-LT8349-BZ.

Block Diagrams and Tables