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BQ2054 Datasheet(PDF) 4 Page - Texas Instruments

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Part No. BQ2054
Description  Lithium Ion Fast-Charge IC
Download  16 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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BQ2054 Datasheet(HTML) 4 Page - Texas Instruments

 
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background image
4
Chip On
VCC
4.5V
Temperature
Checks On
Battery
Status?
Temperature
in Range
Temperature Out
of Range or
Thermistor Absent
Qualification Test
Current
Regulation
@ ICOND
Phase 2
V = VREG
Fault
LED3 =1
MOD = 0
Charge
Complete
Charge
Pending
LED3 flash
MOD = 0
Phase 1
I = IMAX
Temperature Out
of Range or
Thermistor Absent
Temperature In
Range, Return
to Original State
VBAT < VLCO or
VBAT > VHCO
t
t > tMTO or
VBAT < VLCO or
VBAT > VHCO
Fail: t = tQT or
VBAT < VLCO
VBAT > VHCO
Present
VLCO < VBAT < VHCO
VBAT < VMIN
PASS: VBAT
VMIN
VBAT < VREG
VBAT VREG
Fast
Charge
ISNS > IMIN
ISNS
IMIN
or
t
tMTO
FG205401.eps
Absent
VBAT < VLCO or
VBAT > VHCO
>
>
<
>
>
VBAT
VLCO
or
VBAT
VHCO
VBAT
VLCO
or
VBAT
VHCO
Figure 2. bq2054 State Diagram
bq2054


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