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參數(shù)資料
| 型號： | LTC4075HVXEDD |
| 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?。?/td> | 170K |
| 代理商： | LTC4075HVXEDD |
LTC4075HVX
13
4075hvxf
APPLICATIONS INFORMATION
Assuming θJA is 40°C/W (see Thermal Considerations),
the ambient temperature at which the LTC4075HVX will
begin to reduce the charge current is approximately:
TA = 125°C – (5V – 3.3V) (800mA) 40°C/W
TA = 125°C – 1.36W 40°C/W = 125°C – 54.4°C
TA = 70.6°C
The LTC4075HVX can be used above 70.6°C ambient,
but the charge current will be reduced from 800mA. The
approximate current at a given ambient temperature can
be approximated by:
I
CT
VV
BAT
A
IN
BAT
JA
=
°
125
–
(–
) θ
Using the previous example with an ambient temperature
of 80°C, the charge current will be reduced to approxi-
mately:
I
CC
VV
C W
C
CA
I
BAT =
°°
°
=
°
125
80
53 3
40
45
68
–
(– .
)
/
B
BAT
mA
= 662
It is important to remember that LTC4075HVX applica-
tions do not need to be designed for worst-case thermal
conditions, since the IC will automatically reduce power
dissipation when the junction temperature reaches ap-
proximately 125°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 LTC4075HVX DFN package is properly sol-
dered to the PC board ground. When correctly soldered to a
2500mm2 double sided 1oz copper board, the LTC4075HVX
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 ex-
Figure 4. Input Soft Connect Circuit
ample, a correctly soldered LTC4075HVX 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.
Input Capacitor Selection
When an input supply is connected to a portable prod-
uct, the inductance of the cable and the high-Q ceramic
input capacitor form an L-C resonant circuit. While the
LTC4075HVX is capable of withstanding input voltages
as high as 22V, if the input cable does not have adequate
mutual coupling or if there is not much impedance in
the cable, it is possible for the voltage at the input of the
product to reach twice the input voltage before it settles
out. To prevent excessive voltage from damaging the
LTC4075HVX during a hot insertion, it is best to have a
low voltage coefcient capacitor at the input pins to the
LTC4075HVX. This is achievable by selecting an X5R or
X7R ceramic capacitor that has a higher voltage rating
than that required for the application. For example, if the
maximum expected input voltage is 15V, a 25V X5R 1μF
capacitor would be a better choice than the smaller 16V
X5R capacitor.
Using a tantalum capacitor or an aluminum electrolytic
capacitor for input bypassing, or paralleling with a ceramic
capacitor will also reduce voltage overshoot during a hot
insertion. Ceramic capacitors with Y5V or Z5U dielectrics
are not recommended.
Alternatively, the following soft connect circuit can be
employed (as shown in Figure 4).
LTC4075HVX
DCIN/USBIN
INPUT CABLE
15V
INPUT
C1
1
μF
C2
100nF
MN1
4075hvx F04
GND
R1
39k
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| LTC4075HVXEDD#PBF | 功能描述:IC CHARGER LI-ION 10-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4075HVXEDD#PBF | 制造商:Linear Technology 功能描述:BATT CHARGER LI ON DUAL 10DFN 制造商:Linear Technology 功能描述:BATT CHARGER, LI ON, DUAL, 10DFN |
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