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參數(shù)資料
| 型號： | LTC4075XEDD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | 3 X 3 MM, 0.75 MM HEIGHT, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 195K |
| 代理商： | LTC4075XEDD#PBF |
LTC4075/LTC4075X
13
4075Xfa
PD is the power dissipated, VIN is the input supply volt-
age (either DCIN or USBIN), VBAT is the battery voltage
and IBAT is the charge current. The approximate ambient
temperature at which the thermal feedback begins to
protect the IC is:
TA = 105°C – PD θJA
TA = 105°C – (VIN – VBAT) IBAT θJA
Example: An LTC4075 operating from a 5V wall adapter (on
the DCIN input) is programmed to supply 800mA full-scale
current to a discharged Li-Ion battery with a voltage of 3.3V.
Assuming
θJA is 40°C/W (see Thermal Considerations),
the ambient temperature at which the LTC4075 will begin
to reduce the charge current is approximately:
TA = 105°C – (5V – 3.3V) (800mA) 40°C/W
TA = 105°C – 1.36W 40°C/W = 105°C – 54.4°C
TA = 50.6°C
The LTC4075 can be used above 50.6°C ambient, but
the charge current will be reduced from 800mA. The ap-
proximate current at a given ambient temperature can be
approximated by:
I
CT
VV
BAT
A
IN
BAT
JA
=
°
105
–
(–
)
θ
Using the previous example with an ambient temperature
of 60°C, the charge current will be reduced to approxi-
mately:
I
CC
VV
C W
C
CA
ImA
BAT
=
°°
°
=
°
=
105
60
53 3
40
45
68
662
–
(– .
)
/
It is important to remember that LTC4075 applications do
not need to be designed for worst-case thermal conditions,
since the IC will automatically reduce power dissipation
when the junction temperature reaches approximately
105°C.
Thermal Considerations
In order to deliver maximum charge current under all
conditions, it is critical that the exposed metal pad on the
backside of the LTC4075 package is properly soldered
to the PC board ground. When correctly soldered to a
2500mm2 double sided 1oz copper board, the LTC4075
has a thermal resistance of approximately 40°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 40°C/W. As an example,
a correctly soldered LTC4075 can deliver over 800mA to
a battery from a 5V supply at room temperature. Without
a good backside thermal connection, this number would
drop to much less than 500mA.
Protecting the USB Pin and Wall Adapter Input from
Overvoltage Transients
Caution must be exercised when using ceramic capacitors
to bypass the USBIN pin or the wall adapter inputs. High
voltage transients can be generated when the USB or wall
adapter is hot plugged. When power is supplied via the
USB bus or wall adapter, the cable inductance along with
the self resonant and high Q characteristics of ceramic
capacitors can cause substantial ringing which could
exceed the maximum voltage pin ratings and damage the
LTC4075. Refer to Linear Technology Application Note 88,
entitled “Ceramic Input Capacitors Can Cause Overvoltage
Transients” for a detailed discussion of this problem. The
long cable lengths of most wall adapters and USB cables
APPLICATIO S I FOR ATIO
WU
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