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| 型號(hào)： | BQ2007SS |
| 英文描述： | Silicon Bridge Rectifiers |
| 中文描述： | 電池管理 |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大?。?/td> | 118K |
| 代理商： | BQ2007SS |
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with a trickle maintenance-charge that continues as
long as the voltage on pin BAT remains below V
MCV
.
Lithium-Ion Batteries
The bq2000T uses a two-phase fast-charge algorithm for
Li-Ion batteries (Figure 3). In phase one, the bq2000T
regulates constant current until V
BAT
rises to V
MCV
. The
bq2000T then moves to phase two, regulates the battery
with constant voltage of V
MCV
, and terminates when the
charging current falls below the I
MIN
threshold. A new
charge cycle is started if the cell voltage falls below the
V
RCH
threshold.
During the current-regulation phase, the bq2000T
monitors charge time, battery temperature, and battery
voltage for adherence to the termination criteria. During
the final constant-voltage stage, in addition to the
charge time and temperature, it monitors the charge
current as a termination criterion. There is no
post-charge maintenance mode for Li-Ion batteries.
Charge Termination
Maximum Charge Time (NiCD, NiMH, and
Li-Ion)
The bq2000T sets the maximum charge-time through
pin RC. With the proper selection of external resistor
and capacitor, various time-out values may be achieved.
Figure 4 shows a typical connection.
The following equation shows the relationship between
the R
MTO
and C
MTO
values and the maximum charge
time (MTO) for the bq2000T:
MTO = R
MTO
C
MTO
35,988
MTO is measured in minutes, R
MTO
in ohms, and C
MTO
in farads. (
Note:
R
MTO
and C
MTO
values also determine
other features of the device. See Tables 2 and 3 for de-
tails.)
For Li-Ion cells, the bq2000T resets the MTO when the
battery reaches the constant-voltage phase of the
charge. This feature provides the additional charge time
required for Li-Ion cells.
Maximum Temperature (NiCd,NiMH,Li-Ion)
A negative-coefficient thermistor, referenced to V
SS
and
placed in thermal contact with the battery, may be used
as a temperature-sensing device. Figure 5 shows a typi-
cal temperature-sensing circuit.
During fast charge, the bq2000T compares the battery
temperature to an internal high-temperature cutoff
threshold, V
TCO
. As shown in Table 4, high-temperature
termination occurs when voltage at pin TS is less than
this threshold.
T/
t (NiCd,NiMH)
When fast charging, the bq2000T monitors the voltage
at pin TS for rate of temperature change detection,
T/
t. The bq2000T samples the voltage at the TS pin
every 16s and compares it to the value measured 2 sam-
ples earlier. This feature terminates fast charge if this
voltage declines at a rate of
V
161
V
Min
CC
Figure 5 shows a typical connection diagram.
Minimum Current (Li-Ion Only)
The bq2000T monitors the charging current during the
voltage-regulation phase of Li-Ion batteries. Fast charge
is terminated when the current is tapered off to 7% of
the maximum charging current.
Please note that this
threshold is different for the bq2000.
Initial Hold-Off Period
The values of the external resistor and capacitor con-
nected to pin RC set the initial hold-off period. During
this period, the bq2000T avoids early termination by
disabling the
T/
t feature. This period is fixed at the
5
Battery Chemistry
Charge Algorithm
NiCd or NiMH
1. Charge qualification
2. Trickle charge, if required
3. Fast charge (constant current)
4. Charge termination (
T/
t, time)
5. Top-off (optional)
6. Trickle charge
1. Charge qualification
2. Trickle charge, if required
3. Two-step fast charge (constant current followed by constant voltage)
4. Charge termination (minimum current, time)
Li-Ion
Table 1. Charge Algorithm
bq2000T
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