BD9D321EFJ Datasheet, PDF (14/28 Pages) Rohm – 4.5V to 18V Input, 3.0A Integrated MOSFET 1ch Synchronous Buck DC/DC Converter

BD9D321EFJ
2-2 Under Voltage Lockout Protection (UVLO)
The Under Voltage Lockout Protection circuit monitors the VREG terminal voltage.
The operation enters standby when the VREG terminal voltage is 3.5 V (Typ) or lower.
The operation starts when the VREG terminal voltage is 3.8 V (Typ) or higher.
Datasheet
Figure 27. UVLO Timing Chart
※Load at Startup
Ensure that the respective output has light load at startup of this IC. Also, restrain the power supply line noise at startup and
voltage drop generated by operating current within the hysteresis width of UVLO. Noise exceeding the hysteresis noise width
may cause the IC to malfunction.
2-3 Thermal Shutdown Function
When the chip temperature exceeds Tj = 175°C, the DC/DC converter is stopped. The thermal shutdown circuit is
intended for shutting down the IC from thermal runaway in an abnormal state with the temperature exceeding Tjmax =
150°C. Do not use this function for application protection design. This is non-latch protection.
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TSZ22111•15•001
14/25
TSZ02201-0J3J0AC00490-1-2
07.Aug.2013 Rev.001