- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄224115 > LTC4008EGN-1#PBF (LINEAR TECHNOLOGY CORP) 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C PDF資料下載
參數(shù)資料
| 型號： | LTC4008EGN-1#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)： | 6/24頁 |
| 文件大?。?/td> | 221K |
| 代理商： | LTC4008EGN-1#PBF |
LTC4008
14
4008fb
APPLICATIONS INFORMATION
Battery Conditioning
Some batteries require a small charging current to condi-
tion them when they are severely depleted. The charging
current is switched to a high rate after the battery voltage
has reached a “safe” voltage to do so. Figure 6 illustrates
how to do this 2-level charging. When Q1 is on, the charger
current is set to maximum. When Q1 is off, the charging
current is set to 10% of the maximum.
R2
53.6k
CPROG
0.0047μF
4008 F06
LTC4008
Q1
2N7002
R1
26.7k
PROG
10
Figure 6. 2-Level Current Programming
Charger Voltage Programming
A resistor divider, R8 and R9 (see Figure 10), programs
the nal oat voltage of the charger. The equation for oat
voltage is (the input bias current of EA is typically –4nA
and can be ignored):
VFLOAT = VREF (1 + R8/R9)
It is recommended that the sum of R8 and R9 not be less
than 100k. Accuracy of the LTC4008 voltage reference is
±0.8% at 25°C, and ±1% over the full temperature range.
This leads to the possibility that very accurate (0.1%)
resistors might be needed for R8 and R9. Actually, the
temperature of the LTC4008 will rarely exceed 50°C near the
oatvoltagebecausechargingcurrentshavetaperedtoalow
level, so 0.25% resistors will normally provide the required
level of overall accuracy. Table 3 contains recommended
values for R8 and R9 for popular oat voltages.
Table 3
FLOAT VOLTAGE (V)
R9 (kΩ) 0.25%
R8 (kΩ) 0.25%
8.2
24.9
147
8.4
26.1
158
12.3
15
140
12.6
16.9
162
16.4
11.5
147
16.8
13.3
174
Soft-Start
The LTC4008 is soft started by the 0.12μF capacitor on
the ITH pin. On start-up, ITH pin voltage will rise quickly to
0.5V, then ramp up at a rate set by the internal 40μA pull-up
current and the external capacitor. Battery charging current
starts ramping up when ITH voltage reaches 0.8V and full
current is achieved with ITH at 2V. With a 0.12μF capacitor,
time to reach full charge current is about 2ms and it is
assumed that input voltage to the charger will reach full
value in less than 2ms. The capacitor can be increased up
to 1μF if longer input start-up times are needed.
Input and Output Capacitors
The input capacitor (C2) is assumed to absorb all input
switching ripple current in the converter, so it must have
adequate ripple current rating. Worst-case RMS ripple
current will be equal to one-half of output charging current.
Actual capacitance value is not critical. Solid tantalum
low ESR capacitors have high ripple current rating in a
relatively small surface mount package, but caution must
be used when tantalum capacitors are used for input or
output bypass. High input surge currents can be created
when the adapter is hot-plugged to the charger or when
a battery is connected to the charger. Solid tantalum
capacitors have a known failure mechanism when subjected
to very high turn-on surge currents. Kemet T495 series
of “Surge Robust” low ESR tantalums are rated for high
surge conditions such as battery to ground.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC4008EGN-1#TRPBF | 4A, High Efficiency, Multi-Chemistry Battery Charger; Package: SSOP; No of Pins: 20; Temperature Range: -40°C to +125°C |
| LTC4010CFE#PBF | High Efficiency Standalone Nickel Battery Charger; Package: TSSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| LTC4010CFE#TRPBF | High Efficiency Standalone Nickel Battery Charger; Package: TSSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| LTC4011CFE#PBF | High Efficiency Standalone Nickel Battery Charger; Package: TSSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| LTC4011CFE#TRPBF | High Efficiency Standalone Nickel Battery Charger; Package: TSSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4008EGNPBF | 制造商:Linear Technology 功能描述:4A, High Eff Li-Ion Charger LTC4008EGN |
| 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(guān)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(xué):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(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。