LT8350S

推荐新设计使用

40VIN, 18VOUT, 6A Synchronous Buck-Boost Silent Switcher® 2

产品模型
2
产品技术资料帮助

ADI公司所提供的资料均视为准确、可靠。但本公司不为用户在应用过程中侵犯任何专利权或第三方权利承担任何责任。技术指标的修改不再另行通知。本公司既没有含蓄的允许,也不允许借用ADI公司的专利或专利权的名义。本文出现的商标和注册商标所有权分别属于相应的公司。

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产品详情

  • 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • Silent Switcher® 2 Architecture for Low EMI
  • Up to 95% Efficiency at 2MHz
  • Proprietary Peak Current Mode 
  • 3V to 40V Input Voltage Range
  • 1V to 18V Output Voltage Range;
  • ±1.5% Output Voltage Regulation
  • Output/Input Current Regulation and Monitor
  • Constant-voltage/Constant-current Regulation
  • High-Side PMOS Load Switch Driver
  • No Top MOSFET Refresh Noise in Buck or Boost
  • 200kHz to 2MHz Fixed Switching Frequency with External Frequency Synchronization and SSFM
  • VOUT Disconnected from VIN During Shutdown
  • Small 4mm × 6mm 32-Pin LQFN Package
  • AEC-Q100 Qualified
LT8350S
40VIN, 18VOUT, 6A Synchronous Buck-Boost Silent Switcher® 2
LT8350S Simplified Application Diagram LT8350S ds simplified application diagram graph LT8350S Pin Configurations LT8350S ds block diagram
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工具及仿真模型

LTspice


LTspice中提供以下器件型号:

  • LT8350
LTspice

LTspice®是一款强大高效的免费仿真软件、原理图采集和波形观测器,为改善模拟电路的仿真提供增强功能和模型。


评估套件

eval board
EVAL-LT8350S-AZ

LT8350S 40VIN, 18VOUT, 6A Synchronous Buck-Boost Silent Switcher 2

特性和优点

  • 3V–40V Operating Input Voltage
    • Reduced EMI emissions for CISPR 25 Class 5
    • Spread Spectrum Frequency Modulation
    • Input and Output EMI filter
    • In-built Input and Output high-frequency capacitors
  • Adjustable UVLO, VOUT, fSW, Output Current andLimit
  • Voltage-Monitoring (PGOOD) and Current-Monitoring(ISMON)
  • Configurable SYNC pin for Forced Continuous Mode(FCM), Discontinuous Conduction Mode (DCM),SSFM, and external Frequency Synchronization
  • Feed Forward Function for improved transient response

产品详情

The EVAL-LT8350S-AZ Evaluation board is a 40V synchronous buck-boost converter featuring the LT®8350S. It drives up to 2.5A load at 12V output when VIN is between 9V and 40V and will run down to 3VIN with reduced output current. EVAL-LT8350S-AZ runs at 350kHz switching frequency with spread spectrum frequency modulation (SSFM) disabled. When enabled, SSFM spreads the switching frequency of the LT8350S from fSW to fSW + 25% for a reduced electromagnetic interference (EMI) emission.

The LT8350S has an operating input voltage range of 3V to 40V. It has internal, synchronous 42V MOSFETs on the buck side and 20V MOSFETs on the boost side for high efficiency and small size. It has an adjustable switching frequency between 200kHz and 2MHz. The LT8350S can be synchronized to an external source, programmed with SSFM enabled for low EMI, or set to normal operation.

The LT8350S’ integrated LOADTG high-side PMOS driver assists with disconnecting load when a fault is triggered. LOADTG turns off the PMOS when FB<0.25V or FB>1.1V, or ISP–ISN > 0.75V. LOADEN can be used directly to turn off LOADTG and all power switches.

The LT8350S can regulate output current using ISP and ISN. Maximum load current can be limited when LT8350S is used for a constant voltage regulator. It can also be used for an LED driver or a battery charger where constant current regulation is required. Output current can be adjusted by placing a controllable DC voltage on the CTRL pin.

The output current can be monitored through the ISMON output pin. ISMON can be used to improve load transient response by injecting load current to VC. The load current injection is described in the following sections.

An Undervoltage lockout can be adjusted on EVAL-LT8350S-AZ with a few simple resistor choices.

Small ceramic input and output capacitors are used to save space and cost. Although LT8350S has in-built high-frequency capacitors(100nF) on the input and output, the board is designed with tiny, high-frequency capacitors placed near the VIN and VOUT pins for added flexibility.

There is an inductor EMI filter and a small ferrite bead EMI filter on the input and output of EVAL-LT8350S-AZ. These filters, combined with proper board layout and SSFM, are effective in reducing EMI to pass CISPR25 class 5 conducted EMI. Follow the recommended layout and four-layer printed circuit board (PCB) thickness of EVAL-LT8350S-AZ for low EMI applications.

The LT8350S data sheet provides a complete description of the part, operation, and applications information. The data sheet must be read in conjunction with this demo manual for EVAL-LT8350S-AZ. The LT8350S is assembled in a 32-lead laminate package with QFN footprint (LQFN) with thermally enhanced exposed ground pads. Proper board layout is essential for maximum thermal performance.

Design files for this circuit board are available at Product Evaluation Boards and Kits | Design Center | Analog Devices.

EVAL-LT8350S-AZ
LT8350S 40VIN, 18VOUT, 6A Synchronous Buck-Boost Silent Switcher 2
EVAL-LT8350S-AZ Board Photo Angle View EVAL-LT8350S-AZ Board Photo Top View EVAL-LT8350S-AZ Board Photo Bottom View

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