ncv8881 ON Semiconductor, ncv8881 Datasheet - Page 19

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

1
UNLATCH
ENABLE
2
Temp <Shutdown
VIN < 19V &
3
LDOS, SMPS OFF
LDOMON ACTIVE
in regulation
5P0 or 8P5
RESB LOW
regulation
SS Timer Expired
4
SMPS in
RESB LOW
SMPS OFF
Temp <Shutdown
LDOS ON,
Temp > Shutdown
LDOS, SMPS ON
VIN < 19V &
in regulation
5P0 or 8P5
BOOT DELAY
VIN > 19V or
Figure 41. State Diagram
LATCH
ENABLE
RESB HIGH
VFB > SC
Threshold
LDOS, SMPS ON
LDOS, SMPS ON
POR DELAY
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LDOS, SMPS ON
RESB LOW
INIT DELAYS
LDOS ON, SMPS OFF
RESB HIGH
RESB LOW
Temp > Shutdown
LDOMON ACTIVE
5
Enable = 0
INIT SS TIMER
VIN > 19V or
RESB LOW
LDOS ON, SMPS OFF
19
SS TIMER GOING
LDOS, SMPS ON
Temp <Shutdown
LDOS, SMPS OFF
INIT SS TIMER
RESB LOW
VIN < 19V &
RESB LOW
RESB LOW
Invalid
RESB LOW
LDOS OFF,
SMPS OFF
WDI
SS Timer Expired
SMPS out of
regulation
Enable = 0 &
Enable = 1
Enable = 0
VFB < SC
Threshold
Temp > Shutdown
Enable = 0
VIN > 19V or
LDOS, SMPS OFF
LDOMON OFF
RESB LOW
VIN > Vstrt
UNLATCH
ENABLE
VIN < Vstp
POWER
RESET
ON