参数资料
| 型号： | LTC4085EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 21/24页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 14-DFN |
| 标准包装： | 2,500 |
| 功能： | 电源管理 |
| 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： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
| 包装： | 带卷 (TR) |
LTC4085
APPLICATIONS INFORMATION
Consider the above example with an ambient temperature of
55°C. The charge current will be reduced to approximately:
V IN and Wall Adapter Bypass Capacitor
Many types of capacitors can be used for input bypassing.
=
I BAT =
105 ° C – 55 ° C 50 ° C
( 5V – 3V ) ? 37 ° C/W 74 ° C/A
= 0.675A
However, caution must be exercised when using multilayer
ceramic capacitors. Because of the self resonant and high
Q characteristics of some types of ceramic capacitors, high
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 LTC4085 package is soldered to the
board. Correctly soldered to a 2500mm 2 double-sided
1oz. copper board the LTC4085 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
LTC4085 can deliver over 1A to a battery from a 5V supply
voltage transients can be generated under some start-up
conditions, such as connecting the charger input to a hot
power source. For more information, refer to Application
Note 88.
Stability
The constant-voltage mode feedback loop is stable without
any compensation when a battery is connected. However,
a 4.7μF capacitor with a 1 Ω series resistor to GND is
recommended at the BAT pin to keep ripple voltage low
when the battery is disconnected.
at room temperature. Without a backside thermal connec-
tion, this number could drop to less than 500mA.
TYPICAL APPLICATION
USB Power Control Application with Wall Adapter Input
5V WALL
ADAPTER
INPUT
4.7μF
1k
510Ω
510Ω
4.7μF
TO LDOs
REGs, ETC
1Ω*
5V (NOM)
FROM USB
IN
OUT
CABLE V BUS
4.7μF
1Ω*
CHRG
ACPR
GATE
WALL
LTC4085
BAT
V NTC
R NTCBIAS
10k
+
Li-Ion
CELL
NTC
R NTC
SUSPEND USB POWER
500mA/100mA SELECT
SUSP
HPWR
TIMER
10k
*SERIES 1W RESISTOR ONLY
NEEDED FOR INDUCTIVE
INPUT SUPPLIES
PROG CLPROG GND
R PROG R CLPROG
71.5k 2.1k
0.15μF
4085 TA02
4085fd
21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4088 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency Battery Charger/USB Power Manager |
| LTC4088_12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Battery Charger/USB Power Manager |
| LTC4088-1 | 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 |
| LTC4088-1_12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Battery Charger/USB Power Manager |
| LTC4088-2 | 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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