ncp5215 ON Semiconductor, ncp5215 Datasheet - Page 16

• Manufacturer Part Number: ncp5215
• Description: Dual Synchronous Buck Controller For Notebook
• Manufacturer: ON Semiconductor

are turned off and their outputs are float. The fault remains
set until the system has shutdown and re-applied power or
the enable input signal to the regulator controller has
toggled states.
Overvoltage Protection (OVP)
from over voltage. OVP limit is typically 117% of the
nominal output voltage level. If the output voltage is above
this threshold, an OV fault is set, the top gate drive is turned
OFF, and then the bottom gate drive is latched ON to
discharge the output. The fault remains set until the system
has shutdown and re-applied power or the enable input
signal to the regulator controller has toggled states.
Undervoltage Protection (UVP)
undervoltage. UVP limit is 68% of the nominal output
An OVP circuit monitors the output voltages to prevent
A UVP circuit monitors the output voltages to detect
above 4.4V to
enable the IC
VCCA goes
ENBL goes high. Vo is enabled but not
PGOOD
actived until VIN goes above 3.5V.
VCCA
Figure 33. Powerup and Powerdown Timing Diagram per Channel
ENBL
VIN
Vo
t
SFT_START
http://onsemi.com
NCP5215
16
32 Cycles
voltage level. If the output voltage is below this threshold,
a UV fault is set. If an OV protection is set before, the
bottom gate drive is forced high. If no OV protection set,
an internal fault timer will be triggered to count normal
operation clock. After 16 continuous clock pulses, if the
fault still exists the part latches off, both the top gate drive
and the bottom gate drive are turned off and their outputs
are float. The fault remains set until the system has
shutdown and re-applied power or the enable input signal
to the regulator controller has toggled states.
Thermal Protection
protect the device from overheating when the die
temperature exceeds 150°C. Once the thermal protection is
triggered, the fault state can be ended by re-applying V
V
120°C.
IN
Completed
The NCP5215 has a thermal shutdown protection to
Soft-Start
PGOOD Goes High
, or ENBL when the temperature drops down below
PGOOD Goes Low
CC
,