Hello Team,
I would like to make sure the recommend value of Cboot. Should its recommend value be 100nF to 470nF ?
I am confused with the descriptions on the data sheet.
Our data sheet p5. "pin Function" shows as below
Boot-strap capacitor connection for high-side driver. Connect a high quality
100nF or 470nF capacitor from BOOT to SW.
Our data sheet p18 shows as below
8.3.9 Bootstrap Voltage (BOOT)
The LMR23630 provides an integrated bootstrap voltage regulator. A small capacitor between the BOOT and
SW pins provides the gate drive voltage for the high-side MOSFET. The BOOT capacitor is refreshed when the
high-side MOSFET is off and the low-side switch conducts. The recommended value of the BOOT capacitor is
0.1 μF to 0.47 μF. TI recommends a ceramic capacitor with an X7R or X5R grade dielectric with a voltage rating
of 16 V or higher for stable performance over temperature and voltage.
Our data sheet p24 shows as below
9.2.2.8 Bootstrap Capacitor Selection
Every LMR23630 design requires a bootstrap capacitor (CBOOT). TI recommends a capacitor of 0.47 μF, ated 16
V or higher. The bootstrap capacitor is located between the SW pin and the BOOT pin. The bootstrap capacitor
must be a high-quality ceramic type with an X7R or X5R grade dielectric for temperature stability.
Any advice will be appreciated.
Jin
