RT7296F

Copyright © 2023 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS7296F-06

September

2023

www.richtek.com

5

Over-Temperature Protection

Over-temperature protection is implemented to prevent

the

chip

from

operating

at

excessively

high

temperatures. When the junction temperature is higher

than 150

C, the OTP will shut down switching

operation. The chip will automatically resume normal

operation with a complete soft-start sequence once the

junction temperature cools down by approximately

20

C.

BOOT UVLO

The RT7296F implements BOOT UVLO function to

ensure the VBOOT-SW is sufficient to correctly activate

the high side switch at any condition. BOOT UVLO

usually actives at higher VOUT, very light load and small

TTH threshold. With such conditions, the low side

switch may not have sufficient turn-on time to charge

the BOOT capacitor. The BOOT UVLO actives when

VBOOT-SW is lower than 2.65V (typ.), the device will be

forced to turn on the low side switch for 200ns (typ.) to

charge the BOOT

capacitor. The BOOT

UVLO

behavior continues for each PWM cycle until the

VBOOT-SW is higher than 2.9V (typ.)

VOUT

Abnormal case

detected (UV)

SW

0.5ms

1.8ms

Figure 2. Output Undervoltage Protection with Hiccup Mode