LTC4015_15 Datasheet, PDF (34/76 Pages) Linear Technology – Multichemistry Buck Battery Charger Controller with Digital Telemetry System

LTC4015
Operation
Table Default Values for JEITA Parameters
REGION 1
REGION 2
REGION 3
REGION 4
REGION 5
REGION 6
REGION 7
JEITA_T1 =
0x3F00 (0°C)
JEITA_T2 =
0x372A (10°C)
JEITA_T3 =
0x1F27 (40°C)
JEITA_T4 =
0x1BCC (45°C)
JEITA_T5 =
0x18B9 (50°C)
JEITA_T6 =
0x136D (60°C)
CHARGER
OFF
icharge_jeita_2
vcharge_jeita_2
icharge_jeita_3
vcharge_jeita_3
icharge_jeita_4
vcharge_jeita_4
icharge_jeita_5
vcharge_jeita_5
icharge_jeita_6 CHARGER
vcharge_jeita_6 ^OFF
Li-Ion Programmable
CHARGER
OFF
16mV/R_SNSB
4.20V
32mV/R_SNSB
4.20V
32mV/R_SNSB
4.10V
16mV/R_SNSB
4.10V
16mV/R_SNSB
4.05V
CHARGER
OFF
Li-Ion Fixed 4.2V
CHARGER
OFF
16mV/R_SNSB
4.20V
32mV/R_SNSB
4.20V
32mV/R_SNSB
4.10V
16mV/R_SNSB
4.10V
16mV/R_SNSB
4.05V
CHARGER
OFF
Li-Ion Fixed 4.1V
CHARGER
OFF
6mV/R_SNSB
4.10V
32mV/R_SNSB
4.10V
32mV/R_SNSB
4.00V
16mV/R_SNSB
4.00V
16mV/R_SNSB
3.95V
CHARGER
OFF
Li-Ion Fixed 4.0V
CHARGER
OFF
16mV/R_SNSB
4.00V
32mV/R_SNSB
4.00V
32mV/R_SNSB
3.90V
16mV/R_SNSB
3.90V
16mV/R_SNSB
3.85V
CHARGER
OFF
LiFePO₄ Programmable
CHARGER
OFF
16mV/R_SNSB
3.60V
32mV/R_SNSB
3.60V
32mV/R_SNSB
3.50V
16mV/R_SNSB
3.50V
16mV/R_SNSB
3.45V
CHARGER
OFF
LiFePO₄ Fast and Standard Charge
CHARGER
OFF
16mV/R_SNSB
3.60V
32mV/R_SNSB
3.60V
32mV/R_SNSB
3.50V
16mV/R_SNSB
3.50V
16mV/R_SNSB
3.45V
CHARGER
OFF
Lead-Acid Battery Charging
It is the responsibility of the user of the LTC4015 to
consult with the battery manufacturer to determine the
recommended charging parameters for a particular battery.
Battery allowable temperature range while charging and
any required charging parameter temperature coefficients
also need to be considered.
An example of charging profile (battery voltage and cur-
rent vs. time) for a lead-acid battery is shown in Figure 7.
Lead-Acid Charging Parameters
Below is a table of lead-acid charging parameters. For
lead-acid programmable, default values are shown.
Bold parameters are programmable via the serial port in
ABSORB/CC
(ALSO CALLED
BULK CHARGING)
3.0
TEXT INDICATES VALUES REPORTED IN REGISTERS:
CHARGER_STATE/CHARGE_STATUS
CC-CV/CV
CC-CV/CV ¹²
2.5
10
EQUALIZE/CC
2.0
8
ABSORB/CV
EQUALIZE/CV
V_BAT
I_CHG
1.5
6
1.0
4
0.5
2
0
01 2 3
0
T_EQ T_EQ+2 T_EQ+4
TIME (hrs)
4015 F07
Figure 7. Example Charging Profile for a Lead-Acid Battery
4015f
34
For more information www.linear.com/LTC4015