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参数资料
| 型号： | LTC4068XEDD-4.2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT LI-ON 8-DFN |
| 标准包装： | 121 |
| 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： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC4068-4.2/LTC4068X-4.2
OPERATIO
threshold (V RECHRG ), another charge cycle begins and
charge current is once again supplied to the battery. To
manually restart a charge cycle when in standby mode, the
input voltage must be removed and reapplied or the charger
must be shut down and restarted using the EN pin. Figure 1
shows the state diagram of a typical charge cycle.
Thermal Limiting
An internal thermal feedback loop reduces the programmed
charge current if the die temperature attempts to rise above
a preset value of approximately 120 ° C. This feature protects
the LTC4068 from excessive temperature and allows the
user to push the limits of the power handling capability of
POWER ON
EN DRIVEN LOW
BAT < 2.9V
TRICKLE CHARGE
MODE
a given circuit board without risk of damaging the LTC4068.
The charge current can be set according to typical (not worst
case) ambient temperature with the assurance that the
charger will automatically reduce the current in worst-case
OR
UVLO CONDITION
STOPS
SHUTDOWN MODE
I CC DROPS TO <25 μ A
CHRG: Hi-Z
1/10TH FULL CURRENT
CHRG: STRONG
PULL-DOWN
BAT > 2.9V
CHARGE MODE
FULL CURRENT
CHRG: STRONG
PULL-DOWN
LTC4068
ONLY
BAT > 2.9V
conditions. DFN power considerations are discussed fur-
ther in the Applications Information section.
Undervoltage Lockout (UVLO)
An internal undervoltage lockout circuit monitors the input
voltage and keeps the charger in shutdown mode until V CC
rises above the undervoltage lockout threshold. The UVLO
ITERM < 100mV
STANDBY MODE
NO CHARGE CURRENT
circuit has a built-in hysteresis of 200mV. Furthermore, to
protect against reverse current in the power MOSFET, the
UVLO circuit keeps the charger in shutdown mode if V CC
EN DRIVEN HIGH
OR
UVLO CONDITION
CHRG: Hi-Z
406842 F01
2.9V < BAT < 4.1V
falls to within 30mV of the BAT voltage. If the UVLO com-
parator is tripped, the charger will not come out of shut-
down mode until V CC rises 100mV above the BAT voltage.
Figure 1. State Diagram of a Typical Charge Cycle
Charge Status Indicator (CHRG)
The charge status output has two states: pull-down and
high impedance. The pull-down state indicates that the
LTC4068 is in a charge cycle. Once the charge cycle has
terminated or the LTC4068 is disabled, the pin state
becomes high impedance.
Power Supply Status Indicator (ACPR)
The power supply status output has two states: pull-down
and high impedance. The pull-down state indicates that
V CC is above the UVLO threshold (3.8V) and is also 100mV
above the battery voltage. If these conditions are not met,
the ACPR pin is high impedance indicating that the LTC4068
is unable to charge the battery.
Manual Shutdown
At any point in the charge cycle, the LTC4068 can be put
into shutdown mode by driving the EN pin high. This
reduces the battery drain current to less than 2 μ A and the
supply current to less than 50 μ A. When in shutdown
mode, the CHRG pin is in the high impedance state. A new
charge cycle can be initiated by driving the EN pin low. An
internal resistor pull-down on this pin forces the LTC4068
to be enabled if the pin is allowed to float.
Automatic Recharge
Once the charge cycle is terminated, the LTC4068 continu-
ously monitors the voltage on the BAT pin using a com-
parator with a 2ms filter time (t RECHARGE ). A charge cycle
restarts when the battery voltage falls below 4.10V (which
corresponds to approximately 80% to 90% battery capac-
ity). This ensures that the battery is kept at, or near, a fully
406842fa
8
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| LTC4069EDC#TRPBF | 功能描述:IC CHARGER LI-ION 6-DFN RoHS:是 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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