RT5752 datasheet(8/32 Pages) RICHTEK

8 / 32 page

RT5752

DS5752-03 November 2023

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

maximum range of operation as a secondary fail-safe and

therefore should not be relied upon operationally.

Continuous operation above the specified absolute

maximum operating junction temperature may impair

device reliability or permanently damage the device.

Negative Over-Current Limit (RT5752B)

The RT5752B is the part which is forced to PWM and

allows negative current operation. In case of PWM

operation, high negative current may be generated as an

external power source which is tied to output terminal

unexpectedly. As the risk described above, the internal

circuit monitors negative current in each on-time interval

of low-side MOSFET and compares it with NOC threshold.

Once the negative current exceeds the NOC threshold,

the low-side MOSFET is turned off immediately, and then

the high-side MOSFET will be turned on to discharge the

energy of output inductor. This behavior can keep the valley

of negative current at NOC threshold to protect low-side

MOSFET. However, the negative current can't be limited

at NOC threshold anymore since minimum off-time is

reached.

RT5752 Datasheet(PDF) 8 Page - Richtek Technology Corporation