LTC4007-1_15 Datasheet, PDF (10/24 Pages) Linear Technology – 4A, High Efficiency, Li-Ion Battery Charger

LTC4007-1
U
OPERATIO
Table 1. Truth Table for LTC4007-1 Operation (Supplemental)
FROM
NUMBER STATE
TO
STATE MODE
PRESENT NEXT
BATTERY C/10 C/10
DCIN VOLTAGE LATCH LATCH
MAX
BATTERY
CURRENT
TIMER
ACP STATE CHG
1
Any
MSD Shut Down by Low
<BAT
Adapter Voltage
0
OFF
LOW Reset HIGH
2
MSD
SD Charger Shutdown
>BAT
0
OFF
HIGH Reset HIGH
3
SD,
SD Shut Down by
>BAT
CONDITION,
Undervoltage Lockout and
CHARGE
<UVL
OFF
HIGH Reset HIGH*
4
SD CONDITION Start Conditioning a
>BAT <3.25V/Cell
Depleted Battery
10%
HIGH
LOW
Programmed
Current
5
CONDITION CONDITION Input Current Limited >BAT <3.25V/Cell
Condition Charging
<10%
HIGH
Programmed
Current (Note 2)
Running LOW
6
CONDITION CONDITION Conditioning a
Depleted Battery
>BAT <3.25V/Cell
10%
Programmed
Current
HIGH
Running LOW
7
CONDITION CONDITION Timer Defeated (Low >BAT <3.25V/Cell
Battery Conditioning
Still Functional)
10%
Programmed
Current
HIGH
Ignored Forced
LOW
8
CONDITION SD Charger Paused Due to >BAT <3.25V/Cell
Thermistor Out of Range
OFF
HIGH Paused LOW
(Faulted)
9
CONDITION SD Timeout in
>BAT <3.25V/Cell
CONDITION Mode
OFF
HIGH
>T/4 HIGH
(Faulted)
10
CONDITION SD Shut Down by
ACP/SHDN Pin
>BAT <3.25V/Cell
0
OFF
Forced Reset HIGH
LOW
11
CONDITION CHARGE Start Normal Charging >BAT >3.25V/Cell
Programmed
Current
HIGH
Running
12
CHARGE CHARGE Timer Defeated (Low >BAT >3.25V/Cell
Battery Conditioning
Still Functional)
Programmed HIGH Ignored Forced
Current
LOW
13
CHARGE CHARGE Top-Off Charging
>BAT >3.25V/Cell 0
Programmed
Current
HIGH
Running LOW
14
CHARGE CHARGE C/10 Latch is SET
>BAT >3.25V/Cell
when Battery Current
Is Less than 10% of
Programmed Current
1 Programmed HIGH Reset 25µA
Current
15
CHARGE CHARGE Top-Off Charging
>BAT >3.25V/Cell 1
Programmed HIGH Running 25µA
Current
16
CHARGE CHARGE Input Current
Limited Charging
>BAT >3.25V/Cell
<Programmed HIGH
Current (Note 2)
17
CHARGE
SD Charger Paused Due to >BAT >3.25V/Cell
Thermistor Out of Range
OFF
HIGH Paused LOW or
25µA
(Faulted)
18
CHARGE
SD Shut Down by
ACP/SHDN Pin
>BAT >3.25V/Cell
0
OFF
Forced Reset HIGH
LOW
19
CHARGE
SD Terminated by Low-
>BAT <3.25V/Cell
Battery Fault (Note 1)
0
OFF
HIGH >T/4 then HIGH
Reset (Faulted)
20
CHARGE
SD Terminates After T/4
>BAT V_FLOAT
1
OFF
HIGH >T/4 then HIGH
Reset
21
CHARGE
SD Terminates After T
>BAT V_FLOAT*
0
OFF
HIGH >T then HIGH
Reset
*Most probable condition
Note 1: If a depleted battery is inserted while the charger is in this state, the
charger must be reset to initiate charging.
Note 3: Blank fields indicate no change, not considered, or other states impact
value.
Note 2: See section on “Adapter Limiting”.
Note 4: Battery voltage thresholds do not include comparator hysterisis.
Thresholds specify the VLH value.
40071f
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