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SLUS937A – DECEMBER 2009 – REVISED APRIL 2010
SIMPLIFIED BLOCK DIAGRAM
250mV
V
O(SC1)
OUT-SC1
V
BAT
t
DGL(SC2)
OUT- SC2
IN
Short Detect
V
IN-LOW
USB100
USB5 00
EN2
Q1
OUT
225mV
Precharge
2.25V
Fastcharge
ISET
T
J
ILIM
USB-susp
V
REF- ILIM
V
O(REG)
T
J(REG)
V
DPPM
V
OUT
Short Detect
Q2
EN2
EN1
CHARGEPUMP
V
BAT (REG)
BAT
V
BAT
V
OUT
40mV
V
LOWV
225mV)
V
RCH
V
BAT(SC)
SYSOFF
Supplement
t
DGL1(LOWV)
t
DGL2(LOWV)
t
DGL(TE RM)
V
IN
t
DGL(RCH)
V
IN
BAT-SC
V
BAT
+ V
IN-DT
t
DGL(NO-IN)
t
DGL(PGOOD
)
t
DGL(TS
)
Charge Control
V
COLD
TS
V
UVLO
V
OVP
V
HOT
t
BLK(OVP
)
EN1
EN2
USB Suspend
CE
Halt timers
CHG
V
IPRECHG
V
ICHG
V
ISET
Reset timers
PGOOD
Dynamically
Controlled
Oscillator
Fast- Charge
Timer
Pre- Charge
Timer
TMR
Timer fault
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9
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