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參數(shù)資料
| 型號： | LTC4008EGN#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C |
| 中文描述： | BATTERY CHARGE CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-20 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大小： | 221K |
| 代理商： | LTC4008EGN#PBF |
LTC4008
11
4008fb
OPERATION
If the charging current decreases below 10% to 15%
of programmed current, while engaged in input current
limiting, BGATE will be forced low to prevent the charger
from discharging the battery. Audible noise can occur in
this mode of operation.
An overvoltage comparator guards against voltage transient
overshoots (>7% of programmed value). In this case, both
MOSFETs are turned off until the overvoltage condition
is cleared. This feature is useful for batteries which “l(fā)oad
dump” themselves by opening their protection switch
to perform functions such as calibration or pulse mode
charging.
PWM Watchdog Timer
There is a watchdog timer that observes the activity on
the BGATE and TGATE pins. If TGATE stops switching for
more than 40μs, the watchdog activates and turns off the
top MOSFET for about 400ns. The watchdog engages to
prevent very low frequency operation in dropout which
is a potential source of audible noise when using ceramic
input and output capacitors.
Charger Startup
When the charger is enabled, it will not begin switching
until the ITH voltage exceeds a threshold that assures ini-
tial current will be positive. This threshold is 5% to 15%
of the maximum programmed current (100mV/RSENSE).
After the charger begins switching, the various loops will
control the current at a level that is higher or lower than
the initial current. The duration of this transient condition
depends upon the loop compensation but is typically less
than 100μs.
Thermistor Detection
The thermistor detection circuit is shown in Figure 3. It
requires an external resistor and capacitor in order to
function properly.
ICHARGE (% OF MAXIMUM CURRENT)
0
V
PROG
(V)
0.2
0.4
0.6
0.8
4008 F02
1.0
1.2
20
40
60
80
100
1.19V
0.309V
Figure 2. VPROG vs ICHARGE
8
NTC
LTC4008
S1
R10
32.4k
C7
0.47μF
RTH
10k
NTC
–
+
–
+
–
+
60k
~4.5V
CLK
45k
15k
TBAD
4008 F03
D
C
Q
Figure 3
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4009 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage High Current Controller for Battery Charging and Power Management |
| LTC4009-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger |
| LTC4009-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger |
| LTC4009CUF#PBF | 功能描述:IC CHARGER BATTERY MC 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學:鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| LTC4009CUF#TRPBF | 功能描述:IC CHARGER BATTERY MC 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應商設備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
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