參數(shù)資料
型號(hào)： LTC4085EDE-3#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： POWER SUPPLY MANAGEMENT CKT, PDSO14
封裝： 4 X 3 MM, PLASTIC, MO-229, DFN-14
文件頁(yè)數(shù)： 15/24頁(yè)
文件大小： 275K
代理商： LTC4085EDE-3#TRPBF
LTC4085-3
22
40853f
The LTC4085-3 can be used above 36°C, but the charge
current will be reduced below 0.8A. The charge current
at a given ambient temperature can be approximated by:
IBAT =
105°C – TA
VOUT –VBAT
()θ
JA
Consider the above example with an ambient temperature
of 55°C. The charge current will be reduced to approxi-
mately:
IBAT =
105°C – 55°C
5V – 3V
() 43°C/W
=
50°C
86°C/A
= 0.58A
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 LTC4085-3 package is soldered to the
board. Correctly soldered to a 2500mm2 double-sided 1oz.
copper board the LTC4085-3 has a thermal resistance of
approximately 43°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 43°C/W. As an example, a correctly soldered
LTC4085-3 can deliver over 1A to a battery from a 5V
supply at room temperature. Without a backside thermal
connection, this number could drop to less than 500mA.
VIN and Wall Adapter Bypass Capacitor
Many types of capacitors can be used for input bypassing.
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
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 1Ω series resistor to GND is
recommended at the BAT pin to keep ripple voltage low
when the battery is disconnected.
APPLICATIONS INFORMATION
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