ncv8613b ON Semiconductor, ncv8613b Datasheet - Page 12

• Manufacturer Part Number: ncv8613b
• Description: Ncv8613b Ultra-low Iq Automotive System Power Supply Ic Power Saving Triple-output Linear Regulator
• Manufacturer: ON Semiconductor

is not desirable as it can result in unwanted signals being
coupled onto the pin.
VBATT_MON and Warning Flags
Detection, Brown Out Detection, and High Temperature
Detection circuitry. The Overvoltage Shutdown, High
Voltage, and Brown Out Detection circuitry are all run off
the VBATT_MON input. If this functionality is not desired,
grounding of the VBATT_MON pin will turn off the
functions.
impedance state until the VBATT_MON circuitry reaches it
minimum operating voltage, typically 1.0 V to 2.5 V. At that
point the BO_DET signal will be held low, while the
HV_DET signal will go high. The BO_DET signal will go
high once the VBATT_MON signal reaches the Brown Out
Threshold, typically 7 V to 8 V. The BO_DET signal will
stay high until the VBATT_MON voltage drops below the
Brown Out Threshold. The HV_DET signal will stay high
until the VBATT_MON voltage rises above the HV_DET
threshold, typically 16.2 V to 17.8 V. The HV_DET signal
will reassert high once the HV_DET signal crosses the
HV_DET threshold going low.
which indicates when the junction temperature is
approaching thermal shutdown. The Hot Flag signal will
remain high as long as the junction temperature is below the
Hot flag threshold, typically 140°C to 160°C. This pin is
intended as a warning that the junction temperature is
approaching the Thermal Shutdown threshold, which is
LDOX
Delay
Reset
17 V
The NCV8613B is equipped with High Voltage
The HV_DET and BO_DET signals are in a high
The NCV8613B is also equipped with a Hot Flag pin
Vin
Power On Reset
Overload on Output
Figure 4. NCV8613B Reset Timing Diagram
Over Voltage On Input
http://onsemi.com
Load Dump
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typically 160°C to 180°C. The Hot Flag signal will remain
low until the junction temperature drops below the Hot Flag
threshold.
VBATT_MON Pin, and can not be disabled by grounding
VBATT_MON.
output stage. The high signal is provided by V
is tied to an output of the NCV8613B, the signal will go low
if the corresponding output shuts down due to a fault
condition.
Overvoltage Shutdown
(OVS) functionality. The OVS is designed to turn on when
the
VBATT_MON pin is tied to ground, the OVS functionality
will be disabled.
shut down. LDO3 is run off a separate input voltage line,
VIN_S3, and will not shutdown in this condition. Once the
OVS condition has passed, LDO1 and LDO2 will both turn
back on.
prevent a continued OVS condition on the chip once the high
battery condition has subsided. This transistor is needed to
discharge the high voltage from the VIN−H hold−up
capacitor. This transistor will only turn on when an OVS is
detected on−chip, and will turn off as soon as the OVS
condition is no longer detected by the chip.
The Hot_Flag circuitry does not run off the
Each of the three warning circuits utilizes a push−pull
The NCV8613B is equipped with overvoltage shutdown
When OVS is triggered, LDO1 and LDO2 will both be
The VIN−H line is equipped with a bleed transistor to
Glitch on Output
VBATT_MON signal crosses 17 V.
Momentary
Overvoltage on Input
Shutdown via Input
PP
. When V
Vout Reset
Threshold
If
the
PP