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| 型号： | LT1511ISW |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR CONST I/V 3A24SOIC |
| 标准包装： | 32 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子，镍镉，镍氢 |
| 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： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC |
| 包装： | 管件 |
LT1511
APPLICATIO N S I N FOR M ATIO N
LT1511
PROG
300 ?
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
R PROG
4.7k
C PROG
1 μ F
loop has turned switching off. To keep V BAT regulated to
the battery voltage in this condition, R3 and R4 can be
5V
0V
PWM
Q1
VN2222
1511 ? F03
chosen to draw 0.5mA and Q3 can be added to disconnect
them when power is off (Figure 4). R5 isolates the OVP pin
I BAT = (DC)(3A)
Figure 3. PWM Current Programming
Lithium-Ion Charging
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.
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-
LT1511
OVP
Q3
VN2222
R3
12k
0.25%
R5
220k
R4
V IN
+
–
+
–
V BAT
4.2V
4.2V
ing, with the charger holding the battery at “float” voltage
indefinitely. In this case no external sensing of full charge
is needed.
4.99k
0.25%
LT1511 ? F04
Figure 4. Disconnecting Voltage Divider
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 BAT ? 2.465 ) = 162k ( 8.4 ? 2.465 )
2.465 2.465
= 390k
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
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) and a 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.
accuracy.
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1511ISW#PBF | 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1511ISW#TR | 功能描述:IC CHARGER BATT CONST V/I 24SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1511ISW#TRPBF | 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1512 | 制造商:LINER 制造商全称:Linear Technology 功能描述:SEPIC Constant-Current/ Constant-Voltage Battery Charger |
| LT1512C | 制造商:LINER 制造商全称:Linear Technology 功能描述:SEPIC Constant-Current/ Constant-Voltage Battery Charger |
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