Datasheet
17
LTC1479
APPLICATIONS INFORMATION
WUU
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the charging battery through one of the N-channel switch
pairs, SW G or SW H. The charging battery voltage is
simultaneously connected through the CHGMON switch
in the LTC1479 to the top of the charger voltage resistor
divider, R4 and R5, for constant voltage charging. (See the
LT1510 data sheet for further detail.)
LT1511 Battery Charger Interface
The LT1511, 3A CC/CV battery charger with input current
limiting, is connected in a slightly different manner than
the LT1510 as illustrated in Figure 11.
Figure 11. Interfacing to the LT1511 Constant-Voltage/Constant-Current Battery Charger with Input Current Limiting
1479 F11
SW H
Si9926DY
SW G
Si9926DY
BAT1
4 Li-ION
BATTERY
PACK
BAT2
4 Li-ION
BATTERY
PACK
+
+
C
BAT1
47µF
C
BAT2
47µF
DC INPUT
(FROM AC
ADAPTOR)
V
CC
D1
MBRS340T
R1
500Ω
C2
0.33µF
C1
1µF
PROG
R
PROG
4.93k
1%
R
S4
0.05Ω
C3
200pF
V
C
SW
UV
BOOSTCOMP1
SPIN
BAT SENSE
GND
C6
0.47µF
C7
50pF
C12
1µF
C5
10µF
D3
MBR0540T
L1
20µH
D2
MBRS340T
LT1511
C4
10µF
CERAMIC
0.1µF
330Ω
+
C
CHG
22µF
TANT
+
(CHARGER OUTPUT)
Q1
2N7002
R2
1k
CURRENT CONTROL
FROM POWER
MANAGEMENT µP
+
–
R6
649k
0.25%
R5
6.8k
R4
5k
R3
500Ω
R7
115k
0.25%
R
S3
200Ω
1%
R
S2
200Ω
1%
R
S1
0.033Ω
OVP
CLPCLN
TO SW C/D
TO SW E/F
TO
SW A/B
+
–
POWER
MANAGEMENT
µP
BAT1
BAT2
GG
SG
GH SH
CHGMON
DCIN
LTC1479
1479 F10
SW H
Si9926DY
SW G
Si9926DY
BAT1
4 Li-ION
BATTERY
PACK
BAT2
4 Li-ION
BATTERY
PACK
+
+
C
BAT1
47µF
C
BAT2
47µF
DC INPUT
(FROM AC
ADAPTOR)
V
CC
D1
MBRS140T
R2
300Ω
C1
1µF
PROG
R
PROG
11k
1%
R3
1k
C2
0.1µF
V
C
SW
BOOST
SENSE
BAT
GND
C3
0.22µF
0.1µF
D3
1N4148
L1*
33µH
D2
MBRS140T
LT1510
C6
10µF
CERAMIC
+
C
CHG
22µF
TANT
(CHARGER OUTPUT)
Q1
2N7002
R1
100k
1%
CURRENT CONTROL
FROM POWER
MANAGEMENT µP
+
–
R4
649k
0.25%
R5
115k
0.25%
OVP
*COILTRONICS CTX33-2
TO SW C/D
TO SW E/F
TO
SW A/B
330Ω
+
–
POWER
MANAGEMENT
µP
BAT1
BAT2
GG
SG
GH SH
CHGMON
DCIN
LTC1479
Figure 10. Interfacing to the LT1510 Constant-Voltage/Constant-Current Battery Charger