RT7274/79/80/81
External Bootstrap Capacitor (C6)
Connect a 0.1μF low ESR ceramic capacitor between
BOOT and SW. This bootstrap capacitor provides the gate
driver supply voltage for the high sideN-channel MOSFET
switch.
Over Temperature Protection
The RT7274/79/80/81 includes an over temperature
protection (OTP) circuitry to prevent overheating due to
excessive power dissipation. The OTP will shut down
switching operation when the junction temperature
exceeds 150°C. Once the junction temperature cools
down by approximately 25°C the IC will resume normal
operation with a complete soft-start. For continuous
operation, provide adequate cooling so that the junction
temperature does not exceed 150°C.
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8
DS7274/79/80/81-01 February 2013
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
