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参数资料
| 型号： | LTC4088EDE |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A BATTERY CHARGE CONTROLLER, 2.7 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | 4 X 3 MM, 0.75 MM HEIGHT, PLASTIC, DFN-14 |
| 文件页数： | 5/24页 |
| 文件大小： | 272K |
| 代理商： | LTC4088EDE |
LTC4088
13
4088f
Battery Charger
The LTC4088 includes a constant-current/constant-volt-
age battery charger with automatic recharge, automatic
termination by safety timer, low voltage trickle charging,
bad cell detection and thermistor sensor input for out of
temperature charge pausing.
When a battery charge cycle begins, the battery charger
rst determines if the battery is deeply discharged. If the
battery voltage is below VTRKL,typically2.85V,anautomatic
trickle charge feature sets the battery charge current to
10% of the programmed value. If the low voltage persists
for more than 1/2 hour, the battery charger automatically
terminates and indicates, via the
CHRG pin, that the bat-
tery was unresponsive.
Once the battery voltage is above VTRKL, the charger begins
charging in full power constant-current mode. The current
delivered to the battery will try to reach 1031V/RPROG.
Depending on available input power and external load
conditions, the battery charger may or may not be able to
charge at the full programmed rate. The external load will
always be prioritized over the battery charge current. The
USB current limit programming will always be observed
and only additional power will be available to charge the
battery. When system loads are light, battery charge cur-
rent will be maximized.
Charge Termination
The battery charger has a built-in safety timer. Once the
voltage on the battery reaches the pre-programmed oat
voltage of 4.200V, the charger will regulate the battery
voltage there and the charge current will decrease naturally.
Once the charger detects that the battery has reached
4.200V, the 4-hour safety timer is started. After the safety
timer expires, charging of the battery will discontinue and
no more current will be delivered.
Automatic Recharge
Once the battery charger terminates, it will remain off
drawing only microamperes of current from the battery.
If the portable product remains in this state long enough,
the battery will eventually self discharge. To ensure that
the battery is always topped off, a charge cycle will au-
tomatically begin when the battery voltage falls below
VRECHRG (typically 4.1V). In the event that the safety timer
is running when the battery voltage falls below VRECHRG, it
will reset back to zero. To prevent brief excursions below
VRECHRGfrom resetting the safety timer, the battery voltage
must be below VRECHRG for more than 1.5ms. The charge
cycle and safety timer will also restart if the VBUS UVLO
cycles low and then high (e.g., VBUS is removed and then
replaced) or if the charger is momentarily disabled using
the D2 pin.
Charge Current
The charge current is programmed using a single resistor
from PROG to ground. 1/1031th of the battery charge cur-
rent is delivered to PROG, which will attempt to servo to
1.000V. Thus, the battery charge current will try to reach
1031 times the current in the PROG pin. The program
resistor and the charge current are calculated using the
following equations:
R
V
I
V
R
PROG
CHG
PROG
==
1031
,
In either the constant-current or constant-voltage charging
modes, the voltage at the PROG pin will be proportional
to the actual charge current delivered to the battery. The
charge current can be determined at any time by monitoring
the PROG pin voltage and using the following equation:
I
V
R
BAT
PROG
=
1031
In many cases, the actual battery charge current, IBAT, will
be lower than the programmed current, ICHG, due to limited
input power available and prioritization to the system load
drawn from VOUT.
Charge Status Indication
The
CHRG pin indicates the status of the battery charger.
Four possible states are represented by
CHRGwhichinclude
charging, not charging (or oat charge current less than
programmed end of charge indication current), unrespon-
sive battery and battery temperature out of range.
The signal at the
CHRG pin can be easily recognized
as one of the above four states by either a human or a
OPERATIO
U
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| LTC4088EDE#PBF | 功能描述:IC CHRGR BATT HE 14-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC4088EDE#TRPBF | 功能描述:IC BATT CHARGER/USB 14-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 |
| LTC4088EDE-1#PBF | 功能描述:IC BATT CHARGER/USB 14-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 |
| LTC4088EDE-1#TRPBF | 功能描述:IC BATT CHARGER/USB 14-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 |
| LTC4088EDE-1-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency Battery Charger/USB Power Manager with Regulated Output Voltage |
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