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参数资料
| 型号： | LTC3554EPD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.6 A BATTERY CHARGE CONTROLLER, 2590 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, UTQFN-20 |
| 文件页数： | 8/36页 |
| 文件大小： | 418K |
| 代理商： | LTC3554EPD#TRPBF |
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LTC3554/LTC3554-2
16
35542fb
Automatic Recharge
After 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,
the timer will reset back to zero. To prevent brief excur-
sions below VRECHRG from resetting the safety timer, the
battery voltage must be below VRECHRG for approximately
2ms. 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).
Charge Current
The charge current is programmed using a single resis-
tor from PROG to ground. 1/750th of the battery charge
current is delivered to PROG which will attempt to servo
to 1.000V. Thus, the battery charge current will try to
reach 750 times the current in the PROG pin. The program
resistor and the charge current are calculated using the
following equations:
R
PROG =
750V
I
CHG
,I
CHG =
750V
R
PROG
In either the constant-current or constant-voltage charg-
ing modes, the PROG pin voltage will be proportional to
the actual charge current delivered to the battery. There-
fore, the actual charge current can be determined at any
time by monitoring the PROG pin voltage and using the
following equation:
I
BAT =
V
PROG
R
PROG
750
In many cases, the actual battery charge current, IBAT, will
be lower than ICHG due to limited input current available and
prioritization with the system load drawn from VOUT.
Thermal Regulation
To prevent thermal damage to the IC or surrounding
components, an internal thermal feedback loop will au-
tomatically decrease the programmed charge current if
the die temperature rises to approximately 110°C. Ther-
mal regulation protects the LTC3554 from excessive
temperature due to high power operation or high ambient
thermal conditions and allows the user to push the limits
of the power handling capability with a given circuit board
design without risk of damaging the LTC3554 or external
components. The benet of the LTC3554 thermal regula-
tion loop is that charge current can be set according to the
desired charge rate rather than worst-case conditions with
the assurance that the battery charger will automatically
reduce the current in worst-case conditions.
Charge Status Indication
The CHRG pin indicates the status of the battery charger. An
open-drain output, the CHRG pin can drive an indicator LED
through a current limiting resistor for human interfacing or
simply a pull-up resistor for microprocessor interfacing.
When charging begins, CHRG is pulled low and remains
low for the duration of a normal charge cycle. When charg-
ing is complete, i.e., the charger enters constant-voltage
mode and the charge current has dropped to one-tenth
of the programmed value, the CHRG pin is released (high
impedance). The CHRG pin does not respond to the C/10
threshold if the LTC3554 reduces the charge current due
to excess load on the VOUT pin. This prevents false end
of charge indications due to insufcient power available
to the battery charger. Even though charging is stopped
during an NTC fault the CHRG pin will stay low indicating
that charging is not complete.
OPERATION
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| LTC3554EUD#TRPBF | 功能描述:IC USB POWER MANAGER 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:PowerPath™ 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC3554EUD-1#PBF | 功能描述:IC USB POWER MANAGER 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:PowerPath™ 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
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