BD9E301EFJ-LB Datasheet, PDF (18/33 Pages) Rohm – 7.0V to 36V Input, 2.5A Integrated MOSFET Single Synchronous Buck DC/DC Converter

BD9E301EFJ-LB
(2) Under Voltage Lockout Protection (UVLO)
The under voltage lockout protection circuit monitors the VIN terminal voltage.
The operation enters standby when the VIN terminal voltage is 6.4V (Typ) or lower.
The operation starts when the VIN terminal voltage is 6.6V (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
Figure 43. UVLO Timing Chart
Normal operation
(3) Thermal Shutdown (TSD)
When the chip temperature exceeds Tj = 175C, the DC/DC converter output 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. 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.
(4) Over Current Protection (OCP)
The over-current protection function is realized by using the current mode control to limit the current that flows
through the high-side MOSFET at each cycle of the switching frequency.
(5) Reverse Current Protection (RCP)
The reverse current protection function is realized by using the current mode control to limit the current that flows
through the low-side MOSFET at each cycle of the switching frequency.
(6) Over Voltage Protection (OVP)
Over voltage protection function (OVP) compares FB terminal voltage with internal standard voltage VREF. When the
FB terminal voltage exceeds 1.30V (Typ), it turns output MOSFETs off. When output voltage drops until it reaches the
hysteresis, it will return to normal operation.
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TSZ22111•15•001
18/30
TSZ02201-0J3J0AJ00380-1-2
21.Feb.2014 Rev.002