LTC3850

演示电路1231A是一款双路输出、双相5A同步降压转换器，内置LTC3850EGN。整个电路（包括大容量输出电容）可置于所有层的1.04” × 0.94”区域内。LTC3850EGN采用28引脚窄体塑料SSOP封装。该电路板的主要特性：电源轨跟踪、用于偏置的内部5V线性稳压器、用于每路输出、PGOOD信号和模式选择器的RUN引脚，通过这些引脚该转换器可在CCM、跳脉冲或突发工作模式下工作。通过一些微小的元件变更也可与外部时钟同步。该板提供两种版本。DC-1231A-A集成用于电流反馈的片上检测电阻，DC1231A-B配置了DCR检测电路，允许转换器将电感DCR用作检测元件，而非片上检测电阻，从而节省成本和电路板空间并提高效率。

Demonstration circuit 1185 is a dual phase/dual output synchronous buck converter featuring the LTC3850EUF. The demo board comes in two versions. The output voltages for version -A are 2.0V/10A and 1.8V/10A and the output voltages for version -B are 1.5V/15A and 1.2V/15A. The input voltage range is 6.5V to 14V for both versions. For applications that have a 5V ±0.5V input, the board has an optional resistor to tie the INTVCC pin to the V_IN pin.

Demonstration circuit 1231A is a Dual Output, Dual Phase 5A Synchronous Buck Converter featuring the LTC3850EGN. The entire circuit, including the bulk output capacitors, fit within a 1.04” × 0.94” area on all layers. The package style for the LTC3850EGN is a 28-lead narrow plastic SSOP. The main features of the board include rail tracking, an internal 5V linear regulator for bias, RUN pins for each output and a PGOOD signal and a Mode selector that allow the converter to run in CCM, pulse skip or Burst Mode operation. Synchronization to an external clock is also possible through some minor component changes. Two versions of the board are available. DC-1231A-A has an on-board sense resistor for current feedback, while the DC1231A-B is configured with a DCR sense circuit that allows the converter to use the inductor’s DCR as the sense element instead of the on-board sense resistors to save cost and board space and improves efficiency.

Demonstration circuit 1185 is a dual phase/dual output synchronous buck converter featuring the LTC3850EUF. The demo board comes in two versions. The output voltages for version -A are 2.0V/10A and 1.8V/10A and the output voltages for version -B are 1.5V/15A and 1.2V/15A. The input voltage range is 6.5V to 14V for both versions. For applications that have a 5V ±0.5V input, the board has an optional resistor to tie the INTVCC pin to the V_IN pin.

Demonstration circuit 1185 is a dual phase/dual output synchronous buck converter featuring the LTC3850EUF. The demo board comes in two versions. The output voltages for version -A are 2.0V/10A and 1.8V/10A and the output voltages for version -B are 1.5V/15A and 1.2V/15A. The input voltage range is 6.5V to 14V for both versions. For applications that have a 5V ± 0.5V input, the board has an optional resistor to tie the INTVCC pin to the V_IN pin.

Demonstration circuit 1126 is a high density dual output (3.3V/5A and 2.5V/5A) step down converter featuring the LTC3850EUF. The input voltage range is 6.5V to 14V. For applications that have a 5V +/- 0.5V input, the board has an optional resistor to tie the INTVCC pin to the V_IN pin.

An optional DCR sense circuit allows the converter to use the inductor’s DCR as the sense element instead of the on-board sense resistors to save cost and board space and to improve efficiency.