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LT8349ACBZ-R7 Scheda tecnica(PDF) 1 Page - Analog Devices |
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LT8349ACBZ-R7 Scheda tecnica(HTML) 1 Page - Analog Devices |
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1 / 29 page  Data Sheet LT8349 8V, 12A, 2-Phase Low IQ Synchronous Boost Converter Rev B DOCUMENT FEEDBACK TECHNICAL SUPPORT One Analog Wa y, Wilmington, MA 01887 -2356, U.S.A. Tel: 781.329.47 00 ©2024 Analog Devices, Inc. Al l rights rese rve d. FEATURES 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 GENERAL 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. All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION Figure 1. 2.5V to 4.5V Input, 6V Output Boost Converter Figure 2. Efficiency and Power Loss (Burst Mode) L1 0.47µH 0.1µF 8.2kΩ 470pF 4.7pF L1, L2 = Würth 744383360047 54.9kΩ 2MHz 22µF 1MΩ 200kΩ 22µF 0.1µF L2 0.47µH VOUT 6V 3A AT 2.5VIN VOUT FB SW1 LT8349 VIN 2.5V TO 4.5V BST1 EN/UVLO VIN ISET VC SYNC/MODE RT SGND PGND BST2 SW2 5A AT 4.5VIN ×6 ×2 4.7pF VIN = 2.5V VIN = 4.5V LOAD CURRENT (mA) 0.1 1 10 100 1k 5k 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1k 10k |
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