LTC3313

• EVAL-LTC3313EV-MULTI-AZ evaluation board
• Transient circuit included for load transient evaluation
• RT pin pull-up option for external clock synchronization

The EVAL-LTC3313EV-MULTI-AZ features the LTC3313, a 15 A, low-voltage, synchronous step-down Silent Switcher®, operating as a multiphase 2 MHz, 3.0 V to 5.5 V input, 1.2 V buck regulator. The EVAL-LTC3313EV-MULTI-AZ has three build options to provide 2-phase 30 A, 3-phase 45 A, or 4-phase 60 A output solutions. The LTC3313 supports adjustable output voltages from 0.5 V to input voltage (V_IN) and operating frequencies from 500 kHz up to 5 MHz in multiphase operation.

All phases of EVAL-LTC3313EV-MULTI-AZ operate in forced continuous mode at 2 MHz switching frequency (fSW). The LTC3313 can also synchronize to an external clock using a MODE/SYNC turret when the RT pin of the main phase is pulled up to the V_IN pin.

The EVAL-LTC3313EV-MULTI-AZ also has an electromagnetic interference (EMI) filter to reduce conducted EMI. This EMI filter can be included by applying the input voltage at the V_IN EMI terminal.

Figure 4 shows the efficiency of the circuit with a 3.3 V input for all three build options.

An on-board transient circuit is included to measure fast transient performance.

The LTC3313 data sheet gives a complete description of the part, operation, and application information. The data sheet must be read in conjunction with this user guide. The LTC3313 is assembled in a 3 mm × 3 mm LQFN package with exposed pads for low thermal resistance. The layout recommendations for low EMI operation and maximum thermal performance are available in the LTC3313 data sheet.

• EVAL-LTC3313EV-A-Z 评估板
• 包含用于负载瞬态评估的瞬态电路
• 包含 EMI 滤波器，以降低 EMI 发射测试中的噪声
• 用于脉冲跳跃模式评估的 MODE 引脚上拉选项

EVAL-LTC3313EV-A-Z采用LTC3313、15 A低电压同步降压型Silent Switcher^®，作为2 MHz、2.25 V至5.5 V输入、1.2 V、15 A输出降压型稳压器工作。LTC3313支持从0.5 V到输入电压(V_IN)的输出电压(V_OUT)，工作频率从500 kHz到高达5 MHz。LTC3313是一款紧凑型、超低辐射、高效率、高速同步单片式降压型开关稳压器。Silent Switcher技术优化了快速电流环路，可以更轻松地将电磁干扰(EMI)和电磁兼容性(EMC)辐射降至最低。35 ns的最短快速导通时间（典型值）允许在高频率下将高电平V_IN转换为低电平V_OUT。

EVAL-LTC3313EV-A-Z在强制连续模式下运行，开关频率(f_SW)为2MHz，但可以配置为在不同开关频率或脉冲跳跃模式下运行。LTC3313振荡器也可以使用MODE/SYNC turret与外部时钟同步，采用EVAL-LTC3313EV-A-Z的默认设置。用户指南中的图4显示EVALLTC3313EV-A-Z采用3.3 V输入电压时在两种工作模式下的效率与功率损耗。

EVAL-LTC3313EV-A-Z还具有EMI滤波器，可降低传导EMI。可通过在V_IN EMI端子上施加输入电压包含该EMI滤波器。有关EVAL-LTC3313EV-A-Z板的EMI性能，请参阅用户指南的“EMI测试结果”部分。EMI性能图中的红色线条表示传导型和辐射型发射测试的CISPR25 Class 5峰值限值。LTC3313数据手册提供了完整的器件和应用信息说明。必须结合评估板的用户指南，阅读本数据手册。LTC3313采用3 mm × 3 mm LQFN封装，具有裸焊盘，以实现低热阻。LTC3313数据手册中提供了用于实现低EMI运行和最大热性能的布局建议。