BQ24707 Datasheet, PDF (2/36 Pages) Texas Instruments – 1-4 Cell Li+ Battery SMBus Charge Controller With Independent Comparator and Advanced Circuit Protection

bq24707
bq24707A
SLUSA78B – JULY 2010 – REVISED MARCH 2011
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
TYPICAL APPLICATION
Adapter +
Ri
2?
Adapter -
Ci
2.2µF
Q1 (RBFET)
Si4435DDY
Q2 (ACFET)
Si4435DDY
Controlled
By Host
RAC 10m?
C1
0.1µF
C3
0.1µF
C2
0.1µF
ACN
VCC
D2
RB751V40
+1.5V
If no adapter,
and Iout is
needed, this
rail is on
R1
430k
R2
66.5k
+3.3V
R3 R4 R5 R6
10k 10k 10k 10k
HOST SMBus
ACP
R8
100k
R7
316k
ACDET
ILIM
REGN
BTST
R10
HIDRV
10k
U1
SDA
bq24707 ^PHASE
SCL ^bq24707A
LODRV
Dig I/O
R12 R11
100k 39.2k
ACOK
IFAULT
R13
3.01M
CMPOUT
CMPIN
GND
SRP
SRN
ADC
IOUT
C4
PowerPad
100p
R9
10Ω
C5
1µF
C6
1µF
D1
BAT54
C7
0.047µF
Total
Csys
220µF
SYSTEM
Controlled
By Host
Q5 (BATFET)
Si4435DDY
C8
10uF
Q3
Sis412DN
C9
10uF
RSR
10m?
L1
4.7µH
Q4
Sis412DN
C10 C11
10µF 10µF
Pack +
Pack -
R14 _*
10Ω
R15 _*
7.5Ω
C13
0.1µF
C14
0.1µF
F_s = 750kHz, I_adpt = 4.096A, I_chrg = 2.944A, I_lim = 4A, V_chrg = 12.592V, 90W adapter and 3S2P battery pack
See the application information about negative output voltage protection for hard shorts on battery to ground or
battery reverse connection.
Figure 1. Typical System Schematic
PART NUMBER
bq24707
bq24707A
IC MARKING
BQ707
BQ07A
ORDERING INFORMATION
PACKAGE
ORDERING NUMBER
(Tape and Reel)
20-PIN 3.5 x 3.5mm² QFN
bq24707RGRR
bq24707RGRT
20-PIN 3.5 x 3.5mm² QFN
bq24707ARGRR
bq24707ARGRT
COMPARISON TABLE
Condition
bq24707
ACOK default delay
1.3s
Suggest fully charged battery ChargeVoltage() setting
after termination
full scale charge voltage(12.592V for 3S battery)
Suggest fully charged battery ChargeCurrent() setting
after termination
0A
QUANTITY
3000
250
3000
250
bq24707A
1.2ms
0V
0A
2
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