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參數(shù)資料
| 型號(hào)： | LTC4065EDC-4.4#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | 2 X 2 MM, LEAD FREE, PLASTIC, MO-229WCCD-2, DFN-6 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 178K |
| 代理商： | LTC4065EDC-4.4#PBF |
14
LTC4065-4.4
406544f
Example: Consider an LTC4065-4.4 operating from a 5V
wall adapter providing 750mA to a 3.6V Li-Ion battery. The
ambient temperature above which the LTC4065-4.4 will
begin to reduce the 750mA charge current is approxi-
mately:
TA = 115°C – (5V – 3.6V) (750mA) 60°C/W
TA = 115°C – 1.05W 60°C/W = 115°C – 63°C
TA = 52°C
The LTC4065-4.4 can be used above 70
°C, but the charge
current will be reduced from 750mA. The approximate
current at a given ambient temperature can be calculated:
I
CT
VV
BAT
A
CC
BAT
JA
=
°
()
115
–
θ
Using the previous example with an ambient temperature
of 73
°C, the charge current will be reduced to approxi-
mately:
I
CC
VV
C W
C
CA
mA
BAT =
°°
() °
=
°
=
115
73
53 6
60
42
84
500
–
–.
/
Furthermore, the voltage at the PROG pin will change
proportionally with the charge current as discussed in the
Programming Charge Current section.
It is important to remember that LTC4065-4.4 applica-
tions do not need to be designed for worst-case thermal
APPLICATIO S I FOR ATIO
WU
UU
conditions since the IC will automatically reduce power
dissipation when the junction temperature reaches ap-
proximately 115
°C.
Board Layout Considerations
In order to deliver maximum charge current under all
conditions, it is critical that the exposed metal pad on the
backside of the LTC4065-4.4 package is soldered to the PC
board ground. Correctly soldered to a 2500mm2 double-
sided 1 oz. copper board the LTC4065-4.4 has a thermal
resistance of approximately 60
°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 60
°C/W. As an example, a
correctly soldered LTC4065-4.4 can deliver over 750mA
to a battery from a 5V supply at room temperature.
Without a backside thermal connection, this number could
drop to less than 500mA.
VCC Bypass Capacitor
Many types of capacitors can be used for input bypassing;
however, caution must be exercised when using multi-
layer ceramic capacitors. Because of the self-resonant and
high Q characteristics of some types of ceramic capaci-
tors, high voltage transients can be generated under some
start-up conditions, such as connecting the charger input
to a live power source. For more information, refer to
Application Note 88.
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