SNVSBR8D March 2020 – June 2022 LMQ61460
PRODUCTION DATA
The driver of the high-side (HS) switch requires bias higher than VIN. The capacitor, CBOOT, connected between CBOOT and SW works as a charge pump to boost voltage on the CBOOT pin to SW + VCC. A boot diode is integrated on the device die to minimize external component count. TI recommends that a 100-nF capacitor rated for 10 V or higher is used. The VBOOT_UVLO threshold (2.1 V typical) is designed to maintain proper HS switch operation. If the CBOOT capacitor voltage drops below VBOOT_UVLO, then the device initiates a charging sequence turning on the low-side switch before attempting to turn on the HS switch.