JAJSH28D November 2013 – March 2019 LM3697
PRODUCTION DATA.
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In the LM3697 device’s boost circuit the Schottky diode is in the path of the inductor current discharge. As a result the Schottky diode sees a high-current step from 0 to IPEAK each time the switch turns off and the diode turns on. Any inductance in series with the diode causes a voltage spike (VSPIKE = LP_ × di/dt) at SW and OUT. This can potentially over-voltage the SW pin, or feed through to VOUT and through the output capacitor and into GND. Connecting the anode of the diode as close as possible to the SW pin and the cathode of the diode as close as possible to COUT and reduces the inductance (LP_) and minimize these voltage spikes.