ZHCSCW6B August 2014 – January 2018 LM43601
PRODUCTION DATA.
The driver of the HS switch requires a bias voltage higher than VIN when the HS switch is ON. The capacitor connected between CBOOT and SW pins works as a charge pump to boost voltage on the CBOOT pin to (VSW + VCC). The boot diode is integrated on the LM43601 die to minimize the bill of material (BOM). A synchronous switch is also integrated in parallel with the boot diode to reduce voltage drop on CBOOT. TI recommends a high-quality ceramic 0.47 µF, 6.3 V or higher capacitor for CBOOT.