Analog Devices Inc. LT8349 2-Phase Low IQ Synchronous Boost Converter
Analog Devices LT8349 2-Phase Low IQ Synchronous Boost Converter drives two internal N-Channel power MOSFET stages out-of-phase. Multiphase operation allows the use of smaller inductors and reduces input and output capacitor requirements 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 loads. It also features optional spread spectrum frequency modulation (SSFM) to minimize EMI emissions.
The Analog Devices LT8349 integrates 8V/6A power switches. It operates at a fixed switching frequency that is programmable between 300kHz and 4MHz and synchronizable with an external clock. The LT8349 features output soft-start and output overvoltage lockout.
Features
- 2.5V to 5.5V input voltage range
- 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
- Low VIN pin quiescent current
- 0.5µA in shutdown
- 15µA in Burst Mode operation
- Stage Shedding™ and Optional Burst Mode® operation for high efficiency at light load
- Integrated 8V/6A synchronous power switches
- Adjustable and synchronizable from 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 power supplies
- Industrial power supplies
Block Diagram
Evaluation Board
Analog Devices Inc. EVAL-LT8349-BZ Evaluation Board
Evaluates the LT8349, a 2-phase low IQ synchronous boost converter.