- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377705 > LT1511CSW (LINEAR TECHNOLOGY CORP) Octal Bus Transceivers 20-SOIC 0 to 70 PDF資料下載
參數(shù)資料
| 型號： | LT1511CSW |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Octal Bus Transceivers 20-SOIC 0 to 70 |
| 中文描述： | 4 A BATTERY CHARGE CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SOP-24 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 145K |
| 代理商： | LT1511CSW |
11
LT1511
Lithium-Ion Charging
The 3A Lithium Battery Charger (Figure 1) charges lithium-
ion batteries at a constant 3A until battery voltage reaches
a limit set by R3 and R4. The charger will then automati-
cally go into a constant-voltage mode with current de-
creasing to zero over time as the battery reaches full
charge. This is the normal regimen for lithium-ion charg-
ing, with the charger holding the battery at “float” voltage
indefinitely. In this case no external sensing of full charge
is needed.
Battery Voltage Sense Resistors Selection
To minimize battery drain when the charger is off, current
through the R3/R4 divider is set at 15
μ
A. The input current
to the OVP pin is 3nA and the error can be neglected.
With divider current set at 15
μ
A, R4 = 2.465/15
μ
A = 162k
and,
R3
R4 V
2.465
2.465
162k 8.4 2.465
2.465
390k
BAT
=
(
)
=
)
=
Li-Ion batteries typically require float voltage accuracy of
1% to 2%. Accuracy of the LT1511 OVP voltage is
±
0.5%
at 25
°
C and
±
1% over full temperature. This leads to the
possibility that very accurate (0.1%) resistors might be
needed for R3 and R4. Actually, the temperature of the
LT1511 will rarely exceed 50
°
C in float mode because
charging currents have tapered off to a low level, so 0.25%
resistors will normally provide the required level of overall
accuracy.
APPLICATIO
S I
FOR
ATIO
U
W
U
U
When power is on, there is about 200
μ
A of current flowing
out of the BAT and Sense pins. If the battery is removed
during charging, and total load including R3 and R4 is less
than the 200
μ
A, V
BAT
could float up to V
CC
even though the
loop has turned switching off. To keep V
BAT
regulated to
the battery voltage in this condition, R3 and R4 can be
chosen to draw 0.5mA and Q3 can be added to disconnect
them when power is off (Figure 4). R5 isolates the OVP pin
from any high frequency noise on V
IN
. An alternative way is
to use a Zener diode with a breakdown voltage two or three
volts higher than battery voltage to clamp the V
BAT
voltage.
Figure 3. PWM Current Programming
Some battery manufacturers recommend termination of
constant-voltage float mode after charging current has
dropped below a specified level (typically around 10% of
the full current) anda further time out period of 30 minutes
to 90 minutes has elapsed. This may extend the life of the
battery, so check with manufacturers for details. The
circuit in Figure 5 will detect when charging current has
dropped below 400mA. This logic signal is used to initiate
a timeout period, after which the LT1511 can be shut down
by pulling the V
C
pin low with an open collector or drain.
Some external means must be used to detect the need for
additional charging or the charger may be turned on
periodically to complete a short float-voltage cycle.
Current trip level is determined by the battery voltage, R1
through R3 and the sense resistor (R
S1
). D2 generates
hysteresis in the trip level to avoid multiple comparator
transitions.
PWM
R
PROG
4.7k
300
PROG
C
PROG
1
μ
Q1
VN2222
5V
0V
LT1511
1511 F03
I
BAT
= (DC)(3A)
R3
12k
0.25%
R4
4.99k
0.25%
OVP
V
IN
+
–
+
–
4.2V
4.2V
V
BAT
Q3
VN2222
LT1511
LT1511 F04
R5
220k
Figure 4. Disconnecting Voltage Divider
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1511 | Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting |
| LT1511ISW | Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting |
| LT1512CS8 | CAP 220PF 250VAC CERAMIC Y2/X1 |
| LT1512CN8 | SEPIC Constant-Current/ Constant-Voltage Battery Charger |
| LT1512C | Octal Bus Transceivers 20-PDIP 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1511CSW#PBF | 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:Impedance Track™ 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:2.4 V ~ 2.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名稱:296-21665-2 |
| LT1511CSW#TR | 功能描述:IC CHARGER BATT CONST V/I 24SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
| LT1511CSW#TRPBF | 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
| LT1511CSWPBF | 制造商:Linear Technology 功能描述:LT1511CSWPBF |
| LT1511ISW | 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。