ncv8881 ON Semiconductor, ncv8881 Datasheet - Page 18

• Manufacturer Part Number: ncv8881
• Description: Ncv8881 1.5a Automotive Buck Regulator With Watchdog
• Manufacturer: ON Semiconductor

INPUT VOLTAGE
Prior to the appearance of a valid high at the Enable input
(EN pin), VIN voltage above the V
a low level at the Reset output (RESB).
INPUT UNDERVOLTAGE SHUTDOWN
voltage at the VIN pin. If the voltage is below the V
threshold it pulls RESB low, inhibits switching, and shuts
down the LDOs.
INPUT OVERVOLTAGE SHUTDOWN
pulled low, switching is inhibited, the Soft−start circuit is
VIN is the power supply input for all NCV8881 functions.
An Undervoltage Lockout (UVLO) circuit monitors the
If input voltage is above the V
OVSTP
STRT
threshold, RESB is
threshold produces
OPERATING DESCRIPTION
http://onsemi.com
STP
18
reset, and the LDOs are shut off. Upon dropping below the
V
will begin a soft−start sequence regardless of the state of the
EN signal.
STATE DIAGRAM
States within numbered ellipses have common responses
(such as to input overvoltage and high temperature
shutdown) which force an exit from all states within.
OVSTT
Figure 41 shows the State Diagram for the NCV8881.
threshold, the LDOs will powerup and the SMPS