Datasheet

nique minimizes the effect of any AC line ripple that
may feed through the power supply from either 50Hz or
60Hz AC sources. Tolerance onalltimingis±20%.
Maximum Voltage, Temperature, and Time
Any time the voltage on the BAT pin exceeds the maxi-
mum cell voltage, V
MCV
, fast charge or optional top-off
charge is terminated.
Maximum temperature termination occurs anytime the
voltage on the TS pin falls below the temperature cut-off
threshold V
TCO
where
V
TCO
= 0.225 ∗ V
CC
±5%
Maximum charge time is configured using the TM pin.
Time settings are available for corresponding charge
rates of C/4, 1C, and 2C. Maximum time-out termina-
tion is enforced on the fast-charge phase, then reset, and
5
bq2002D/T
Part No.
Corresponding
Fast-Charge Rate TM
Typical Fast-Charge
and Top-Off
Time Limits
(minutes)
Top-Off
Rate
Pulse-
Trickle Rate
Pulse-
Trickle
Period (ms)
bq2002D
C/4 Mid 440 None None None
1C Low 110 None None None
2C High 55 None None None
bq2002T
C/4 Mid 320 C/64 C/256 18.3
1C Low 80 C/16 C/256 73.1
2C High 40 None C/128 73.1
Notes: Typical conditions = 25°C, V
CC
= 5.0V
Mid = 0.5
*
V
CC
±0.5V
Tolerance on all timing is ±20%
Table 1. Fast-Charge Safety Time/Top-Off Table
TD2002F1.eps
Fast ChargingV
CC
= 0
Fast Charging
CC Output
LED
s
s
Charge initiated by application of power
Charge initiated by battery replacement
Pulse-Trickle
Top-Off
(optional,
bq2002T only)
(optional,
bq2002T only)
286
See
Table 1
s
286
4576
Figure 5. Charge Cycle Phases