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参数资料
| 型号： | LTC4054ES5-4.2#TRMPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT; Package: SOT; No of Pins: 5; Temperature Range: -40°C to +125°C |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | LEAD FREE, PLASTIC, TSOT-23, 5 PIN |
| 文件页数： | 16/16页 |
| 文件大小： | 185K |
| 代理商： | LTC4054ES5-4.2#TRMPBF |
9
LTC4054-4.2/LTC4054X-4.2
405442xf
than 2
A and the supply current to less than 50A. 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 VCC 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 VCC
is within 100mV of the BAT pin voltage or insufficient voltage
is applied to the VCC 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 (tRECHARGE). 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.
OPERATIO
U
lockout conditions. A weak pull-down indicates that VCC
meets the UVLO conditions and the LTC4054 is ready to
charge. High impedance indicates that the LTC4054 is in
undervoltage lockout mode: either VCC is less than 100mV
above the BAT pin voltage or insufficient voltage is applied
to the VCC 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-
tion section.
Undervoltage Lockout (UVLO)
An internal undervoltage lockout circuit monitors the input
voltage and keeps the charger in shutdown mode until VCC
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 VCC
falls to within 30mV of the battery voltage. If the UVLO
comparator is tripped, the charger will not come out of
shutdown mode until VCC rises 100mV above the battery
voltage.
Manual Shutdown
At any point in the charge cycle, the LTC4054 can be put
into shutdown mode by removing RPROG thus floating the
PROG pin. This reduces the battery drain current to less
TRICKLE CHARGE
MODE
1/10TH FULL CURRENT
BAT > 2.9V
BAT < 2.9V
BAT > 2.9V
CHRG: STRONG
PULL-DOWN
CHARGE MODE
FULL CURRENT
CHRG: STRONG
PULL-DOWN
SHUTDOWN MODE
CHRG: Hi-Z IN UVLO
WEAK PULL-DOWN
OTHERWISE
PROG
RECONNECTED
OR
UVLO CONDITION
STOPS
PROG FLOATED
OR
UVLO CONDITION
ICC DROPS TO <25A
POWER ON
PROG < 100mV
STANDBY MODE
NO CHARGE CURRENT
CHRG: WEAK
PULL-DOWN
2.9V < BAT < 4.05V
405442 F01
Figure 1. State Diagram of a Typical Charge Cycle
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4054ES5-4.2#TRPBF | Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT; Package: SOT; No of Pins: 5; Temperature Range: -40°C to +125°C |
| LTC4054XES5-4.2#TRMPBF | Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT; Package: SOT; No of Pins: 5; Temperature Range: -40°C to +125°C |
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| LTF5022T-4R7N2R0-LC | 1 ELEMENT, 4.7 uH, FERRITE-CORE, GENERAL PURPOSE INDUCTOR, SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4054L | 制造商:LINER 制造商全称:Linear Technology 功能描述:150mA Standalone Linear Li-Ion Battery Charger in ThinSOT |
| LTC4054L-4.2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:150mA Standalone Linear Li-Ion Battery Charger in ThinSOT |
| LTC4054LES5-4.2 | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion 10mA to 150mA 4.2V 5-Pin TSOT-23 |
| LTC4054LES5-4.2#PBF | 制造商:Linear Technology 功能描述:Bulk 制造商:Linear Technology 功能描述:CHARGER BATTERY LI-ION 0.8A 5SOT23 制造商:Linear Technology 功能描述:CHARGER, BATTERY, LI-ION, 0.8A, 5SOT23 |
| LTC4054LES5-4.2#TR | 功能描述:IC CHARGR BATTERY L-ION TSOT23-5 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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