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参数资料
| 型号： | LTC4054XES5-4.2#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGR BATTERY L-ION TSOT23-5 |
| 标准包装： | 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： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC4054XES5-4.2 LTC4054XES5-4.2-ND |
LTC4054-4.2/LTC4054X-4.2
OPERATIO
lockout conditions. A weak pull-down indicates that V CC
meets the UVLO conditions and the LTC4054 is ready to
charge. High impedance indicates that the LTC4054 is in
undervoltage lockout mode: either V CC is less than 100mV
above the BAT pin voltage or insufficient voltage is applied
to the V CC pin. A microprocessor can be used to distin-
guish between these three states—this method is dis-
cussed in the Applications Information section.
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 LTC4054 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 LTC4054. 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 conditions. ThinSOT power consid-
erations are discussed further in the Applications Informa-
than 2 μ A and the supply current to less than 50 μ A. A new
charge cycle can be initiated by reconnecting the program
resistor.
In manual shutdown, the CHRG pin is in a weak pull-down
state as long as V CC is high enough to exceed the UVLO
conditions. The CHRG pin is in a high impedance state if
the LTC4054 is in undervoltage lockout mode: either V CC
is within 100mV of the BAT pin voltage or insufficient voltage
is applied to the V CC pin.
Automatic Recharge
Once the charge cycle is terminated, the LTC4054 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 4.05V (which
corresponds to approximately 80% to 90% battery capac-
ity). This ensures that the battery is kept at or near a fully
charged condition and eliminates the need for periodic
charge cycle initiations. CHRG output enters a strong pull-
down state during recharge cycles.
CHARGE MODE
tion 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
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
falls to within 30mV of the battery voltage. If the UVLO
comparator is tripped, the charger will not come out of
shutdown mode until V CC rises 100mV above the battery
voltage.
Manual Shutdown
POWER ON
PROG
RECONNECTED
OR
UVLO CONDITION
STOPS
SHUTDOWN MODE
I CC DROPS TO <25 μ A
CHRG: Hi-Z IN UVLO
WEAK PULL-DOWN
OTHERWISE
PROG FLOATED
OR
UVLO CONDITION
BAT < 2.9V
TRICKLE CHARGE
MODE
1/10TH FULL CURRENT
CHRG: STRONG
PULL-DOWN
BAT > 2.9V
BAT > 2.9V
FULL CURRENT
CHRG: STRONG
PULL-DOWN
PROG < 100mV
STANDBY MODE
NO CHARGE CURRENT
CHRG: WEAK
PULL-DOWN
At any point in the charge cycle, the LTC4054 can be put
into shutdown mode by removing R PROG thus floating the
PROG pin. This reduces the battery drain current to less
2.9V < BAT < 4.05V
405442 F01
Figure 1. State Diagram of a Typical Charge Cycle
405442xf
9
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