Datasheet

( )
TERM SET
SET
(TERM)
V x K
( ) ( )
I =
R
( )
( )
TAPER SET
SET
(TAPER)
V x K
( ) ( )
I =
R
( )
( )
SET SET
SET
O(OUT)
K x V
( ) ( )
I =
R
( )
( )
PRECHG SET
SET
O(PRECHG)
V x K
( ) ( )
I =
R
( )
bq24010, bq24012
bq24013, bq24014, bq24018
www.ti.com SLUS530K –SEPTEMBER 2002–REVISED JANUARY 2014
BATTERY PRE-CONDITIONING
During a charge cycle, if the battery voltage is below the V
(LOWV)
threshold, the bqTINY applies a pre-charge
current, I
O(PRECHG)
, to the battery. This feature revives deeply discharged cells. The resistor connected between
the ISET and V
SS
, R
SET
, determines the pre-charge rate. The V
(PRECHG)
and K
(SET)
parameters are specified in
the specifications table.
(3)
The bqTINY activates a safety timer, t
(PRECHG)
, during the conditioning phase. If V
(LOWV)
threshold is not reached
within the timer period, the bqTINY turns off the charger and enunciates FAULT on the STAT1 and STAT2 pins.
Refer to Timer Fault Recovery section for additional details.
BATTERY CHARGE CURRENT
The bqTINY offers on-chip current regulation with programmable set point. The resistor connected between the
ISET and V
SS
, R
SET
, determines the charge rate. The V
(SET)
and K
(SET)
parameters are specified in the
specifications table.
(4)
BATTERY VOLTAGE REGULATION
Voltage regulation feedback is accomplished through the BAT pin. This input is tied directly and close to the
positive side of the battery pack. The bqTINY monitors the battery-pack voltage between the BAT and VSS pins.
When the battery voltage rises to V
O(REG)
threshold, the voltage regulation phase begins and the charging current
begins to taper down.
As a safety backup, the bqTINY also monitors the charge time in the charge mode. If termination does not occur
within this time period, t
(CHG)
, the bqTINY turns off the charger and enunciates FAULT on the STAT1 and STAT1
pins. Refer to the Timer Fault Recovery section for additional details.
CHARGE TAPER DETECTION, TERMINATION AND RECHARGE
The bqTINY monitors the charging current during the voltage regulation phase. Once the taper threshold, I
(TAPER)
,
is detected the bqTINY initiates the taper timer, t
(TAPER)
. Charge terminates after the timer expires. The resistor
connected between the ISET and V
SS
, R
SET
, determines the taper detection level. The V
(TAPER)
and K
(SET)
parameters are specified in the specifications table.
(5)
The bqTINY resets the taper timer in the event that the charge current returns above the taper threshold, I
(TAPER)
.
In addition to the taper current detection, the bqTINY terminates charge in the event that the charge current falls
below the I
(TERM)
threshold. This feature allows for quick recognition of a battery removal condition or insertion of
a fully charged battery. Note that taper timer is not used for I
(TERM)
detection. The resistor connected between the
ISET and V
SS
, R
SET
, determines the taper detection level. The V
(TERM)
and K
(SET)
parameters are specified in the
specifications table.
(6)
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