LTC4006_15 Datasheet, PDF (10/20 Pages) Linear Technology – 4A, High Efficiency, Standalone Li-Ion Battery Charger

LTC4006
U
OPERATIO
Table 2. Truth Table for LTC4006 Operation (Supplemental)
NUMBER
FROM
STATE
TO
STATE
MODE
1
Any
MSD Shut Down by Low Adapter Voltage
2
MSD
SD
Charge Shutdown
3
SD,
SD
CONDITION,
CHARGE
Shut Down by Undervoltage Lockout
4
SD
CONDITION Start Conditioning a Depleted Battery
DCIN
<BAT
>BAT
>BAT
and
<UVL
>BAT
BAT
VOLTAGE
<2.5V/Cell
5
CONDITION CONDITION Input Current Limited Condition Charging
>BAT
<2.5V/Cell
6
CONDITION CONDITION Conditioning a Depleted Battery
>BAT
<2.5V/Cell
7
CONDITION CONDITION Timer Defeated. (Low-Battery Conditioning Still >BAT
Functional)
8
CONDITION
SD
Charger Paused Due to Thermistor Out of Range >BAT
<2.5V/Cell
<2.5V/Cell
PRESENT C/10 NEXT C/10
LATCH
LATCH
0
0
MAX BAT
CURRENT
OFF
OFF
OFF
ACP/SHDN
LOW
HIGH
HIGH
10% Programmed
Current
<10% Programmed
Current (Note 2)
10% Programmed
Current
10% Programmed
Current
OFF
HIGH
HIGH
HIGH
HIGH
HIGH
TIMER
STATE
Reset
Reset
Reset
Running
Running
Ignored
Paused
9
CONDITION
SD
Timeout in CONDITION Mode
>BAT
<2.5V/Cell
OFF
HIGH
>T/4
10 CONDITION
SD
Shut Down by ACP/SHDN Pin
11 CONDITION CHARGE Start Normal Charging
>BAT
>BAT
<2.5V/Cell
>2.5V/Cell
12
CHARGE CHARGE Timer Defeated. (Low-Battery Conditioning Still >BAT
>2.5V/Cell
Functional)
13
SD
CHARGE Restart
>BAT 2.5V ≤ V_BAT ≤ 3.9V
(V/Cell)
14
CHARGE CHARGE Top-Off Charging
>BAT
>3.9V/Cell
0
15
CHARGE CHARGE C/10 Latch is SET when Battery Current is Less >BAT
>2.5V/Cell
Than 10% of Programmed Current
16
CHARGE CHARGE Top-Off Charging
>BAT
>3.9V/Cell
1
17
CHARGE CHARGE Input Current Limited Charging
>BAT
>2.5V/Cell
18
CHARGE
SD
Charger Paused Due to Thermistor Out of Range >BAT
>2.5V/Cell
0
OFF
Forced LOW
Reset
Programmed
Current
HIGH
Running
Programmed
Current
HIGH
Ignored
0
Programmed
HIGH
Current
Reset
Programmed
Current
HIGH
Running
1
Programmed
HIGH
Current
Reset
Programmed
Current
HIGH
Running
<Programmed
Current (Note 2)
HIGH
OFF
HIGH
Paused
19
CHARGE
20
CHARGE
SD
Shut Down by ACP/SHDN Pin
SD
Terminated by Low-Battery Fault (Note 1)
>BAT
>BAT
>2.5V/Cell
<2.5V/Cell
0
OFF
Forced LOW
Reset
0
OFF
HIGH
>T/4 then Reset
21
CHARGE
22
CHARGE
SD
Terminates After 1/4 T
SD
Terminates After T
>BAT
>BAT
V_FLOAT
V_FLOAT**
Note 1: If a depleted battery is inserted while the charger is in this state,
the charger must be reset to initiate charging.
Note 2: See section on “Adapter Limiting”.
Note 3: The information contained in this table is supplemental to the
LTC4006 data sheet and has not been production qualified.
Note 4: Blank fields indicate no change, not considered, or other states
impact value.
*Open Drain. High when used with pull-up resistor.
** Most probable condition.
1
OFF
HIGH
>T/4 then Reset
0
OFF
HIGH
>T/4 then Reset
LTC4006: State Diagram (Supplemental)
MASTER
SHUTDOWN
1 _ANY
2
SHUTDOWN
CHG*
HIGH
HIGH
HIGH**
LOW
LOW
LOW
Forced LOW
LOW
(Faulted)
HIGH
(Faulted)
HIGH
Forced LOW
LOW
25µA
25µA
LOW or 25µA
(Faulted)
HIGH
HIGH
(Faulted)
HIGH
HIGH
5,
13 6,
7
4 _{3, 8,}
9, 10
CONDITION
3, 18, 19,
20, 21, 22
11
10
CHARGE
12, 14, 15, 16, 17
4006 F15
4006fa