BD9B400MUV Datasheet, PDF (19/34 Pages) Rohm – Integrated MOSFET Single Synchronous Buck DC/DC Converter

BD9B400MUV
(2) Under Voltage Lockout Protection (UVLO)
The Under Voltage Lockout Protection circuit monitors the AVIN terminal voltage.
The operation enters standby when the AVIN terminal voltage is 2.45V (Typ) or lower.
The operation starts when the AVIN terminal voltage is 2.55V (Typ) or higher.
V_IN
UVLO OFF
hys
UVLO ON
0V
V_OUT
FB
terminal
High side
MOSFET gate
Soft start
Low side
MOSFET gate
Normal operation
UVLO
Normal operation
Figure 47. UVLO Timing Chart
(3) Thermal Shutdown
When the chip temperature exceeds Tj=175C (Typ), the DC/DC converter output is stopped. The circuits are
automatically restored to normal operation when the chip temperature falls. It has a hysteresis of 25C (Typ). 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. It is not meant to protect or guarantee the soundness of the application. Do
not use the function of this circuit for application protection design.
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22.Apr.2016 Rev.002