Datasheet

10
LTC4006
4006fa
OPERATIO
U
Table 2. Truth Table for LTC4006 Operation (Supplemental)
FROM TO BAT PRESENT C/10 NEXT C/10 MAX BAT TIMER
NUMBER STATE STATE MODE DCIN VOLTAGE LATCH LATCH CURRENT ACP/SHDN STATE CHG*
1 Any MSD Shut Down by Low Adapter Voltage <BAT 0 OFF LOW Reset HIGH
2 MSD SD Charge Shutdown >BAT 0 OFF HIGH Reset HIGH
3 SD, SD Shut Down by Undervoltage Lockout >BAT OFF HIGH Reset HIGH**
CONDITION, and
CHARGE <UVL
4 SD CONDITION Start Conditioning a Depleted Battery >BAT <2.5V/Cell 10% Programmed HIGH LOW
Current
5 CONDITION CONDITION Input Current Limited Condition Charging >BAT <2.5V/Cell <10% Programmed HIGH Running LOW
Current (Note 2)
6 CONDITION CONDITION Conditioning a Depleted Battery >BAT <2.5V/Cell 10% Programmed HIGH Running LOW
Current
7 CONDITION CONDITION Timer Defeated. (Low-Battery Conditioning Still >BAT <2.5V/Cell 10% Programmed HIGH Ignored Forced LOW
Functional) Current
8 CONDITION SD Charger Paused Due to Thermistor Out of Range >BAT <2.5V/Cell OFF HIGH Paused LOW
(Faulted)
9 CONDITION SD Timeout in CONDITION Mode >BAT <2.5V/Cell OFF HIGH >T/4 HIGH
(Faulted)
10 CONDITION SD Shut Down by ACP/SHDN Pin >BAT <2.5V/Cell 0 OFF Forced LOW Reset HIGH
11 CONDITION CHARGE Start Normal Charging >BAT >2.5V/Cell Programmed HIGH Running
Current
12 CHARGE CHARGE Timer Defeated. (Low-Battery Conditioning Still >BAT >2.5V/Cell Programmed HIGH Ignored Forced LOW
Functional) Current
13 SD CHARGE Restart >BAT 2.5V ≤ V
BAT
≤ 3.9V 0 Programmed HIGH Reset
(V/Cell) Current
14 CHARGE CHARGE Top-Off Charging >BAT >3.9V/Cell 0 Programmed HIGH Running LOW
Current
15 CHARGE CHARGE C/10 Latch is SET when Battery Current is Less >BAT >2.5V/Cell 1 Programmed HIGH Reset 25µA
Than 10% of Programmed Current Current
16 CHARGE CHARGE Top-Off Charging >BAT >3.9V/Cell 1 Programmed HIGH Running 25µA
Current
17 CHARGE CHARGE Input Current Limited Charging >BAT >2.5V/Cell <Programmed HIGH
Current (Note 2)
18 CHARGE SD Charger Paused Due to Thermistor Out of Range >BAT >2.5V/Cell OFF HIGH Paused LOW or 25µA
(Faulted)
19 CHARGE SD Shut Down by ACP/SHDN Pin >BAT >2.5V/Cell 0 OFF Forced LOW Reset HIGH
20 CHARGE SD Terminated by Low-Battery Fault (Note 1) >BAT <2.5V/Cell 0 OFF HIGH >T/4 then Reset HIGH
(Faulted)
21 CHARGE SD Terminates After 1/4 T >BAT V
FLOAT
1 OFF HIGH >T/4 then Reset HIGH
22 CHARGE SD Terminates After T >BAT V
FLOAT
** 0 OFF HIGH >T/4 then Reset HIGH
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.
MASTER
SHUTDOWN
1
2
ANY
SHUTDOWN
4
CONDITION
11
13
3, 18, 19,
20, 21, 22
3, 8,
9, 10
5,
6,
7
CHARGE
12, 14, 15, 16, 17
4006 F15
LTC4006: State Diagram (Supplemental)