SLUS810A – SEPTEMBER 2008 – REVISED DECEMBER 2008......................................................................................................................................
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SIMPLIFIED BLOCK DIAGRAM
250mV
V
O(SC1)
Q1
OUT-SC1
V
BAT
t
DGL(SC2)
OUT-SC2
IN
Short Detect
V
IN-LOW
USB100
USB500
EN2
225mV
Precharge
2.25V
Fastcharge
OUT
ISET
T
J
ILIM
USB-susp
V
REF- ILIM
V
O(REG)
T
J(REG)
V
DPPM
V
OUT
Q2
Short Detect
EN2
EN1
I
BIAS- ITERM
225mV
(’72, ’73, ’75)
CHARGEPUMP
V
BAT (REG)
V
BAT
V
OUT
40mV
V
LOWV
V
RCH
V
BAT(SC)
Supplement
BAT
SYSOFF
bq24075
ITERM
bq24074
~3V
I TERM-floating
t
DGL1(LOWV)
t
DGL2(LOWV)
t
DGL(TERM)
V
IN
t
DGL(RCH)
V
BAT
+ V
IN-DT
t
DGL(NO-IN)
t
DGL(PGOOD)
t
DGL(TS
)
BAT-SC
I
NTC
V
HOT
Charge Control
TS
V
UVLO
V
OVP
V
COLD
t
BLK(OVP)
V
DIS(TS)
EN1
EN2
USB Suspend
CE
Halt timers
V
IPRECHG
V
ICHG
V
ISET
Fast-Charge
Timer
Timer fault
Dynamically
Controlled
Oscillator
Reset timers
TD
(bq24072,
bq24073)
CHG
PGOOD
TMR
Pre-Charge
Timer
~100mV
Timers disabled
8
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