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参数资料
| 型号： | LTC4055EUF-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/24页 |
| 文件大小： | 0K |
| 描述： | IC USB PWR MNGR BATT CHRGR 16QFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 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： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN（4x4） |
| 包装： | 带卷 (TR) |
LTC4055/LTC4055-1
OPERATION
The LTC4055/LTC4055-1 can be used above 46°C, but the
charge current will be reduced below 0.8A. The charge
current at a given ambient temperature can be approxi-
mated by:
temperature. Without a backside thermal connection, this
number could drop to less than 500mA.
STABILITY
( V OUT BAT ) ? θ JA
I BAT =
105 ° C – T A
– V
The constant-voltage mode feedback loop is stable without
any compensation when a battery is connected. However,
a 1μF capacitor with a 1Ω series resistor to GND is recom-
Consider the above example with an ambient temperature
of 55°C. The charge current will be reduced to approxi-
mended at the BAT pin to keep ripple voltage low when
the battery is disconnected.
105 ° C – 55 ° C 50 ° C
( 5 V – 3 V ) ? 37 ° C / W 74 ° C / A
mately:
I BAT =
=
= 0 .6675A
Ideal Diode from BAT to OUT
Forward regulation for the LTC4055/LTC4055-1 from BAT
to OUT has three operational ranges, depending on the
magnitude of the load current. For small load currents,
Board Layout Considerations
In order to be able to deliver maximum charge current
under all conditions, it is critical that the Exposed Pad
on the backside of the LTC4055/LTC4055-1 package is
soldered to the board. Correctly soldered to a 2500mm 2
double-sided 1oz. copper board, the LTC4055/LTC4055-1
has a thermal resistance of approximately 37°C/W. Failure
to make thermal contact between the Exposed Pad on the
backside of the package and the copper board will result
in thermal resistances far greater than 37°C/W. As an
example, a correctly soldered LTC4055/LTC4055-1 can
deliver over 1A to a battery from a 5V supply at room
the LTC4055/LTC4055-1 will provide a constant-voltage
drop; this operating mode is referred to as “constant
V ON ” regulation. As the current exceeds I FWD , the voltage
drop will increase linearly with the current with a slope
of 1/R DIO,ON ; this operating mode is referred to as
“constant R ON ” regulation. As the current increases
further, exceeding I MAX , the forward voltage drop will
increase rapidly; this operating mode is referred to as
“constant I ON ” regulation. The characteristics for the
following parameters: R FWD , R ON , V FWD , and I FWD are
speci?ed with the aid of Figure 4.
I MAX
LTC4055
SLOPE: 1/R DIO,ON
CONSTANT
I ON
CONSTANT
R ON
I FWD
SCHOTTKY
SLOPE: 1/R FWD
DIODE
CONSTANT
V ON
0
V FWD
FORWARD VOLTAGE (V)
4055 F04
Figure 4. LTC4055/LTC4055-1 vs Schottky Diode Forward Voltage Drop
4055fb
20
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相关代理商/技术参数 |
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| LTC4056 | 制造商:LINER 制造商全称:Linear Technology 功能描述:150mA Standalone Linear Li-Ion Battery Charger in ThinSOT |
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| LTC4056ETS8-4.2#TR | 功能描述:IC CHARGR BATTERY L-ION TSOT23-8 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 |
| LTC4056ETS8-4.2#TRM | 功能描述:IC CHARGR BATTERY L-ION TSOT23-8 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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