Datasheet

VIN
V7
V3
nPUC (internal)
BU3_EN
BSTpd
PGOOD
Vstorage
VIN
Inrush
current
limited
Target
Vstorage
10ms
ss
timers
Buck1
Buck2
Buck3
PGOOD timer
GASP
V
IN
V
STORAGE
V
LDO_PD
Processor dying gasp
treshold
Reset state
Check Internal
Rails (VIN, V3,
and V7)
Normal mode
Enable buckx as
soon as Enx is
high
Discharge
Enable
capacitors for
10msec
Read EEPROM
No fault
Faultint=1 OR
Faultext=1
Inherent
hiccup
Faultint: Overtemperature, UVLO , V7V
Faultext: UV on any buck for more than 10 ms
VIN UVLO
Reset state
(VIN is low)
PreCharge
Vstorage charges
toward VIN
Pump to
Vstorage
VIN>Vrelease
&&
BU_EN
VIN<=Vrelease
Dump
VIN>Vrelease
BU_EN=LO
or nPUC=LO
VIN>1.5
nPUC=LO or
BU_EN=LO
VIN<1.5
TPS65250
SLVSAA3C –JUNE 2010–REVISED OCTOBER 2012 www.ti.com
STATE MACHINE
Figure 1. Normal Operation Figure 2. Pump and Dump Mode
Figure 3. Power-Up Timing Figure 4. Pump and Dump Timing
(Showing Automatic Start-Up)
nPUC Occurs at 3 V
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