LT8292

评估电路 EVAL-LT8292-BZ 具有 LT^®8292：可并联的 4 开关同步升降压控制器。LT8292 可在输入电压低于、等于或高于输出电压的情况下调节输出电压和输出或输入电流。LT8292 具有 5.5V 至 60V 的宽输入范围和工作区域之间的无缝转换，非常适合汽车、工业和电信系统。升降压峰值电流模式架构允许可调锁相 100kHz 至 650kHz 固定频率操作或内部扩频操作，以实现低电磁干扰 (EMI)。此外，LT8292 还具有 ISHARE 和 IGND 引脚，可实现多 IC 无引脚均流功能，适用于更高功率的应用。

EVAL-LT8292-BZ 在 9V 至 36V 的输入电压范围内工作，并产生 12V 的输出。25A 的最大输出电流允许高达 300W 的功率输送，同时实现超过 97% 的效率。开关频率设置为 100kHz，以实现高功率和效率。该电路板还可以进行修改，以支持更大的 MOSFET，从而实现更高的功率。

输出电压和 EN/UVLO 均由电阻分压器编程。LT8292 支持 1V 至 60V 的输出电压范围，容差为 2%。EN/UVLO 设置为当输入电压低于 8.1V 时电路将关闭，当输入电压升至 8.5V 以上时电路将打开。LT8292 采用分离上拉/下拉栅极驱动器和四种可选死区时间设置。EVAL-LT8292-BZ 允许进行简单的改动，以优化这些功能。PGOOD 状态标志指示输出电压在最终调节电压的 ±8% 范围内。

EVAL-LT8292-BZ 具有​​ MOSFET，可补充 LT8292 的 5V 栅极驱动，以实现高效率。四开关拓扑的输入和输出侧可使用 40V MOSFET。陶瓷电容器因其体积小、纹波电流能力强而用于电路输入和输出。除了陶瓷电容器，输入和输出上还有大容量铝聚合物电容器，可在瞬态期间使输入和输出稳定。ICTRL 输入通过 100kΩ 电阻上拉至 VREF 引脚，将输出限流值设置为最大值，并且可使用 ICTRL 引脚上的外部电压来降低限流值。SS 引脚处的电容器可对软启动进行编程。

高功率操作、并联能力、5.5V 输入电压操作、四开关升降压拓扑、专有峰值电流模式架构、故障保护和输出电流限制使 LT8292 成为高功率稳压器电路的有吸引力的选择。

LT8292AFE 采用耐热性能增强型 38 引脚 TSSOP 封装。LT8292 数据手册提供了该器件、其运行和应用信息的完整说明。必须结合本用户指南阅读 LT8292 数据手册，才能正确使用评估电路 EVAL-LT8292-BZ。评估电路设计为可以轻松重新配置，以适应其他应用。向厂家咨询以寻求帮助。

提供了此电路板的设计文件。

Evaluation circuit EVAL-LT8292-AZ features the LT®8292: a parallelable 4-switch synchronous buck-boost controller. The LT8292 regulates the output voltage and output or input current from an input voltage below, equal to, or above the output voltage. With a wide 5.5V to 60V input range and a seamless transition between operating regions, the LT8292 is ideal for automotive, industrial, and telecom systems. The buck-boost peak current mode architecture allows adjustable phase-lockable 100kHz to 650kHz fixed frequency operation or internal spread spectrum operation for low Electromagnetic interference (EMI). Additionally, LT8292 features ISHARE and IGND pins, allowing for multi-IC leaderless current-sharing capabilities for higher-power applications.

The EVAL-LT8292-AZ operates from 9V to 36V input voltage range and generates an output of 12V. A maximum output current of 50A allows up to 600W power delivery while achieving efficiencies that exceed 97%. The board utilizes two LT8292s in parallel, both set to 100kHz, to achieve high power and efficiency.

The output voltage and EN/UVLO are both programmed by resistor dividers. The LT8292 supports an output voltage range from 1V to 60V with a 2% tolerance. EN/UVLO is set so the circuit will turn off when the input voltage falls below 8.1V and will turn on when the input voltage rises above 8.5V.

LT8292 utilizes split pull-up/pull-down gate drivers and four selectable dead time settings. EVAL-LT8292-AZ allows for simple alterations to optimize these features.

The PGOOD status flag indicates when the output voltage is within ±8% of the final regulation voltage.

The EVAL-LT8292-AZ features MOSFETs that comple-ment the 5V gate drive of the LT8392 to achieve high efficiency. 40V MOSFETs are used on the input and output side of the four-switch topology. Ceramic capacitors are used at both the circuit input and output because of their small size and high ripple current capability. In addition to ceramic capacitors, there are bulk aluminum polymer capacitors on the input and output to make input and output stable during the transient period.

The ICTRL input is pulled up to the VREF pin through a 100kΩ resistor to set the output current limit to its maximum, and an external voltage on the ICTRL pin can be used to lower the current limit. A capacitor at the SS pin programs soft-start.

High power operation, parallel capability, 5.5V input voltage operation, 4-switch buck-boost topology, proprietary peak current mode architecture, fault protection, and output current limiting make the LT8292 attractive for high power voltage regulator circuits.

The LT8292AFE is available in a thermally enhanced 38-lead TSSOP package. The LT8292 datasheet gives a complete description of this part, its operation, and applications information. The LT8292 data sheet must be read in conjunction with this user guide to properly use the evaluation circuit EVAL-LT8292-AZ. The evaluation circuit is designed to be easily reconfigured to suit other applications, including the example schematics in the datasheet. Consult the factory for assistance.