EVAL-LT83401-AZ/EVAL-LT83402-AZ

Product Details

The EVAL-LT83401-AZ and EVAL-LT83402-AZ (abbreviated as EVAL-LT83401/2-AZ) demonstration boards are 42V, 1A, and 2.5A synchronous Silent Switcher^® 3 step-down regulators with ultra-low noise, high efficiency, and power density, featuring the LT83401 and LT83402 (abbreviated as LT83401/2), respectively. The input voltage range of the EVAL-LT83401/2-AZ is 4.8V to 42V. The default demo board setting is 3.3V output with a maximum 1A/2.5A DC output current. The LT83401/2 is a compact, ultra-low noise, ultra-low emission, high efficiency, and high-speed synchronous monolithic step-down switching regulator. The uniquely designed combination of the ultra-low noise reference and third-generation Silent Switcher architecture enables the LT83401/2 to achieve both high efficiency and excellent wideband noise performance. A minimum on-time of 22ns allows high V_IN to low V_OUT conversion at high frequency.

The LT83401/2’s switching frequency can be programmed either through an external resistor (RT) or an external clock over a 300kHz to 6MHz range. The default frequency of EVAL-LT83401/2-AZ demo boards is 2MHz. The SYNC/MODE pin on the demo boards is connected to ground by default for pulse-skip mode operation. To synchronize to an external clock, move JP1 to SYNC and apply the external clock to the SYNC terminal. Select the forced continuous mode (FCM) by moving the JP1 shunt, respectively. Figure 1 and Figure 2 in the User Guide show the efficiency of the EVAL-LT83401/2-AZ at the 12V and 24V inputs in FCM operation (input from V_IN terminal). Figure 3 shows the temperature rise of the LT83401 on the EVAL-LT83401-AZ demo board under 12V and 24V input voltage conditions across the full load range. Figure 4 shows the temperature rise of the LT83402 on the EVAL-LT83402-AZ demo board under 12V and 24V input voltage conditions across the full load range. The case temperature rise was measured with the following reference points: The peak IC case temperature and a point on the board, marked with a red ‘X’ as shown in the thermal images Figure 12 and Figure 13 in the User Guide.

Please see the User Guide for the full description.