LT7809

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135V Synchronous Buck Controller with Symmetrical Sink/Source Capability and Dynamically Adjustable Output Voltage Programming

Wide input buck controller with symmetrical sink and source currents and split gate driver topology.

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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。

概述

  • Wide Input Voltage (VIN - VSS) Range: 8.0V to 135V (140V ABS MAX)
  • Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 135V (140V ABS MAX)
  • Dynamically Adjustable VOUT Programming
  • Symmetrical Sink and Source Current Capability for Fast VOUT Slewing Up or Down
  • Split-Output Gate Drivers for Adjustable Turn-On and Turn-Off Driver Strengths and Small Dead-Times (35ns)
  • Floating I/O Control Pins Referenced to System GND
  • 100% Duty Cycle Operation
  • Programmable or Synchronizable Frequency (100kHz to 2.5MHz)
  • 32-Pin (5mm x 5mm) QFN Package
LT7809
135V Synchronous Buck Controller with Symmetrical Sink/Source Capability and Dynamically Adjustable Output Voltage Programming
LT7809 Functional Block Diagram LT7809 Pin Configuration LT7809 Chip Illustration
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EVAL-LT7809-AZ

135V Buck Controller with Dynamically Adjustable Output Voltage

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产品详情

The evaluation circuit EVAL-LT7809-AZ features the LT7809: a 135V synchronous buck controller with symmetrical sink/source capability and dynamically adjustable output voltage programming. The symmetrical sink and source current capability allow for fast VOUT slewing up and down. Split gate drivers allow for easily adjustable turn-on and turn-off of FETs. Additionally, the IC features low IQ, up to 2.5MHz programmable/ synchronizable switching frequency, and a small 32-lead (5mm x 5mm) QFN package. These features allow for a wide variety of applications including industrial, military, medical, and telecommunications systems.

The EVAL-LT7809-AZ operates from a 16V to 100V input voltage range and generates a 60V, 5A output. Using the VOUTADJ feature, the output voltage can be lowered from60V down to 4V without skipping cycles. The EVAL-LT7809-AZ is set to a 500kHz switching frequency, which results in a small and efficient circuit.

The EVAL-LT7809-AZ supports output voltages from 0.8V to 100V. The evaluation circuit has been designed with 150V FETs. Various FETs of similar footprint can be substituted to fit a wide array of applications.

The EVAL-LT7809-AZ is a high-performance, flexible step-down regulator that can adjust its output voltage on-the-fly. The LT7809 data sheet gives a complete description of this part, its operation, and application information. The data sheet must be read in conjunction with this user guide for the EVAL-LT7809-AZ.

Design files for this circuit board are available at www.analog.com.
EVAL-LT7809-AZ
135V Buck Controller with Dynamically Adjustable Output Voltage
EVAL-LT7809-AZ Angle Evaluation Board Photo EVAL-LT7809-AZ Bottom Angle Evaluation Board Photo EVAL-LT7809-AZ Top Evaluation Board Photo EVAL-LT7809-AZ Bottom Evaluation Board Photo

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