ltc1760 Linear Technology Corporation, ltc1760 Datasheet - Page 7

• Manufacturer Part Number: ltc1760
• Description: Dual Smart Battery System Manager
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
Note 10. Does not include current supplied by V
I
Note 11. Measured with thermistors not present, R
removed and SMBALERT = 1. See Applications Information section:
“Calculating IC Operating Current” for example on how to calculate total IC
operating current.
TYPICAL PERFOR A CE CHARACTERISTICS
VCC2_AC0
17.0
16.5
16.0
15.5
15.0
14.5
14.0
13.5
–15
–20
–25
–10
–5
0
4700
0
BAT1 INITIAL CAPACITY = 0%
BAT2 INITIAL CAPACITY = 90%
PROGRAMMED CHARGER CURRENT = 3A
PROGRAMMED CHARGER VOLTAGE = 16.8V
Charging Voltage Accuracy
Dual Charging Batteries with
Different Charge State
CURRENT
)
20
VOLTAGE
BAT2
7132
40
BAT2
ChargingVoltage() (mV)
TIME (MINUTES)
60
9564
BAT1
VOLTAGE
80
11996
100
BAT1
CURRENT
120
14428
W
140
1760 G01
16860
160
U
3500
3000
2500
2000
1500
1000
500
0
CC
1760 G04
to V
VILIM
CC2
–10
–15
–20
10
–5
and R
5
0
(I
0
12.0
11.0
10.0
12.0
11.0
10.0
Charging Current Accuracy
9.0
8.0
9.0
8.0
VCC2_AC1
ILIM
0
Dual Battery Discharge Time vs
Sequential Battery Discharge
(Li-Ion)
BATTERY TYPE: 10.8V Li-Ion (MOLTECH NI2020)
LOAD CURRENT = 3A
800
20
ChargingCurrent() (mA)
or
VOLTAGE
VOLTAGE
40
BAT2
BAT1
1600
VOLTAGE
VOLTAGE
60
BAT1
BAT2
TIME (MINUTES)
80 100
Note 12. Requested currents below 44mV/R
due to charger offsets. The charging current for requested currents below
4mV/R
Refer to Applications Information: “Setting Charger Output Current Limit”
for values of R
Note 13. This limit is greater than the absolute maximum for the charger.
Therefore, there is no effective limitation for the voltage when this option
is selected.
2400
SEQUENTIAL
MINUTES
SENSE
120
3200
DUAL
11
140 160
will be between 4mV/R
1760 G02
SENSE
4000
.
1760 G05
180
3500
3000
2500
2000
1500
1000
3500
3000
2500
2000
1500
1000
500
500
15
14
13
12
11
10
15
14
13
12
11
10
0
0
0
Dual Battery Dischage Time vs
Sequential Battery Discharge
(NiMH)
0
BATTERY TYPE: 12V NiMH (MOLTECH NJ1020)
LOAD: 33W
BATTERY TYPE: 10.8V Li-Ion (MOLTECH NI2020)
REQUESTED CURRENT = 3A
REQUESTED VOLTAGE = 12.3V
MAX CHARGER CURRENT = 4.1A
Dual Battery Charge Time vs
Sequential Battery Charging
SENSE
CURRENT
20
BAT1
50
VOLTAGE
VOLTAGE
and (Requested Current – 8mA).
BAT1
BAT2
BAT1
CURRENT
40
SENSE
100
TIME (MINUTES)
VOLTAGE
VOLTAGE
TIME (MINUTES)
BAT2
BAT1
BAT2
CURRENT
60
may not servo correctly
LTC1760
150
SEQUENTIAL
MINUTES
80
BAT2
CURRENT
200
MINUTES
DUAL
100
16
100
SEQUENTIAL
DUAL
250
120
1760 G06
7
1760 G03
1760f
140
300