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參數(shù)資料
| 型號： | LTC4065LEDC#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, 0.75 MM HEIGHT, LEAD FREE, EXPOSED PAD, PLASTIC, MO-229WCCD-2, DFN-6 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 168K |
| 代理商： | LTC4065LEDC#PBF |
13
LTC4065L/LTC4065LX
4065lxfa
In constant-current mode, the PROG pin is in the feedback
loop, not the battery. Because of the additional pole
created by the PROG pin capacitance, capacitance on this
pin must be kept to a minimum. With no additional
capacitance on the PROG pin, the charger is stable with
program resistor values as high as 25k. However, addi-
tional capacitance on this node reduces the maximum
allowed program resistor. The pole frequency at the PROG
pin should be kept above 100kHz. Therefore, if the PROG
pin is loaded with a capacitance, CPROG, the following
equation should be used to calculate the maximum resis-
tance value for RPROG:
R
C
PROG
≤
π
1
2105
Average, rather than instantaneous, battery current may
be of interest to the user. For example, if a switching power
supply operating in low current mode is connected in
parallel with the battery, the average current being pulled
out of the BAT pin is typically of more interest than the
instantaneous current pulses. In such a case, a simple RC
filter can be used on the PROG pin to measure the average
battery current as shown in Figure 4. A 10K resistor has
been added between the PROG pin and the filter capacitor
to ensure stability.
Power Dissipation
Due to the low charge currents, it is unlikely that the
LTC4065L will reduce charge current through thermal
feedback. Nonetheless, the LTC4065L power dissipation
can be approximated by:
PD = (VCC – VBAT) IBAT
Where PD is the power dissipated, VCC is the input supply
voltage, VBAT is the battery voltage and IBAT is the charge
current. It is not necessary to perform any worst-case
power dissipation scenarios because the LTC4065L will
automatically reduce the charge current to maintain the
die temperature at approximately 115
°C. However, the
approximate ambient temperature at which the thermal
feedback begins to protect the IC is:
TA = 115°C – PD θJA
TA = 115°C – (VCC – VBAT) IBAT θJA
Figure 4. Isolating Capacitive Load on the PROG Pin and Filtering
APPLICATIO S I FOR ATIO
WU
UU
4065L F04
CFILTER
CHARGE
CURRENT
MONITOR
CIRCUITRY
RPROG
LTC4065L
PROG
GND
10k
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4065LX | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Standalone 250mA Li-Ion Battery Charger in 2 x 2 DFN |
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| LTC4065LXEDC#TRPBF | 功能描述:IC CHARGER LI-ION 6-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝: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 |
| LTC4066 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:USB Power Controller and Li-Ion Linear Charger with Low Loss Ideal Diode |
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