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参数资料
| 型号： | LTC4064EMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT L-ION 4V 10-MSOP |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.25 V ~ 6.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
LTC4064
OPERATIO
The LTC4064 is a linear battery charger designed primarily
for charging single cell lithium-ion batteries used in back-
up applications. With a 4V final float voltage accuracy of
± 1%, the LTC4064 maximizes the lifetime of 4.2V chem-
istry lithium-ion batteries. A precision, automatic recharge
feature ensures that the battery voltage remains within
100mV of this 4V float voltage at all times.
Featuring an internal P-channel power MOSFET, the charger
uses a constant-current/constant-voltage charge algo-
rithm with programmable current and a programmable
timer for charge termination. Charge current can be
programmed up to 1.25A with an accuracy of ± 7%. No
blocking diode or sense resistor is required thus dropping
the external component count to three for the basic
charger circuit. The CHRG, ACPR, and FAULT open-drain
status outputs provide information regarding the status of
the LTC4064 at all times. An NTC thermistor input
provides the option of charge qualification using battery
temperature.
An internal thermal limit reduces the programmed charge
current if the die temperature attempts to rise above a
preset value of approximately 105 ° C. This feature protects
the LTC4064 from excessive temperature, and allows the
user to push the limits of the power handling capability of
a given circuit board without risk of damaging the LTC4064
or the external components. Another benefit of the LTC4064
thermal limit is that charge current can be set according to
typical, not worst-case, ambient temperatures for a given
application with the assurance that the charger will auto-
matically reduce the current in worst-case conditions.
The charge cycle begins when the voltage at the V CC pin
rises above the UVLO level, a program resistor is con-
nected from the PROG pin to ground, and the SHDN pin is
pulled above the shutdown threshold. At the beginning of
the charge cycle, if the battery voltage is below 2.48V, the
charger goes into trickle charge mode to bring the cell
voltage up to a safe level for charging. The charger goes
into the fast charge constant-current mode once the
voltage on the BAT pin rises above 2.48V. In constant-
current mode, the charge current is set by R PROG .
When the battery approaches the final float voltage, the
charge current begins to decrease as the LTC4064 enters
the constant-voltage mode. When the current drops to
10% of the full-scale charge current, an internal compara-
tor latches off the MOSFET on the CHRG pin and connects
a weak current source to ground (30 μ A) to indicate a near
end-of-charge (C/10) condition. The C/10 latch can be
cleared by grounding the SHDN pin momentarily, or
momentarily removing and reapplying V CC .
An external capacitor on the TIMER pin sets the total
charge time. When this time elapses, the charge cycle
terminates and the CHRG pin assumes a high impedance
state. To restart the charge cycle, remove the input voltage
and reapply it, or momentarily force the SHDN pin to 0V.
The charge cycle will also restart if the BAT pin voltage falls
below the recharge threshold.
When the input voltage is not present, the charger goes
into a sleep mode, dropping battery drain current, I BAT , to
less than 3 μ A. This greatly reduces the current drain on the
battery and increases the standby time. The charger can be
shut down (I CC = 25 μ A) by forcing the SHDN pin to 0V.
sn4064 4064fs
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| LTC4065 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone 750mA Li-Ion Battery Charger in 2 】 2 DFN |
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| LTC4065AEDC#TR | 功能描述:IC CHARGER BATT LI-ON 6-DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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