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参数资料
| 型号： | LTC4008EGN-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER CTRLR 4A 20SSOP |
| 标准包装： | 55 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC4008
OPERATION
1.2
1.0
0.8
0.6
0.4
1.19V
Charger Startup
When the charger is enabled, it will not begin switching
until the I TH voltage exceeds a threshold that assures ini-
tial current will be positive. This threshold is 5% to 15%
of the maximum programmed current (100mV/R SENSE ).
After the charger begins switching, the various loops will
control the current at a level that is higher or lower than
0.2
0.309V
the initial current. The duration of this transient condition
depends upon the loop compensation but is typically less
0
0
20
40
60
80
100
than 100μs.
I CHARGE (% OF MAXIMUM CURRENT)
4008 F02
Figure 2. V PROG vs I CHARGE
If the charging current decreases below 10% to 15%
of programmed current, while engaged in input current
Thermistor Detection
The thermistor detection circuit is shown in Figure 3. It
requires an external resistor and capacitor in order to
function properly.
limiting, BGATE will be forced low to prevent the charger
from discharging the battery. Audible noise can occur in
LTC4008
CLK
this mode of operation.
An overvoltage comparator guards against voltage transient
overshoots (>7% of programmed value). In this case, both
R TH
10k
NTC
R10
32.4k
C7
0.47μF
8
NTC
S1
–
+
~4.5V
MOSFETs are turned off until the overvoltage condition
is cleared. This feature is useful for batteries which “load
dump” themselves by opening their protection switch
to perform functions such as calibration or pulse mode
charging.
PWM Watchdog Timer
+
–
–
60k
45k
There is a watchdog timer that observes the activity on
the BGATE and TGATE pins. If TGATE stops switching for
+
15k
more than 40μs, the watchdog activates and turns off the
top MOSFET for about 400ns. The watchdog engages to
D
C
Q
TBAD
prevent very low frequency operation in dropout which
is a potential source of audible noise when using ceramic
input and output capacitors.
Figure 3
4008 F03
4008fb
11
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| LTC4009CUF#PBF | 功能描述:IC CHARGER BATTERY MC 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
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