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参数资料
| 型号： | LTC4065AEDC#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT LI-ON 6-DFN |
| 标准包装： | 500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 3.75 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 供应商设备封装： | 6-DFN-EP（2x2） |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC4065AEDC-ND |
LTC4065/LTC4065A
APPLICATIO S I FOR ATIO
length, however, may add enough series inductance to
require a bypass capacitor of at least 1 μ F from BAT to
GND. Furthermore, a 4.7 μ F capacitor with a 0.2 ? to 1 ?
series resistor from BAT to GND is required to keep ripple
voltage low when the battery is disconnected.
High value capacitors with very low ESR (especially ce-
ramic) may reduce the constant-voltage loop phase mar-
gin. Ceramic capacitors up to 22 μ F may be used in parallel
with a battery, but larger ceramics should be decoupled
with 0.2 ? to 1 ? of series resistance.
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, C PROG , the following
equation should be used to calculate the maximum resis-
tance value for R PROG :
Power Dissipation
The conditions that cause the LTC4065/LTC4065A to
reduce charge current through thermal feedback can be
approximated by considering the power dissipated in the
IC. For high charge currents, the LTC4065/LTC4065A
power dissipation is approximately:
P D = (V CC – V BAT ) ? I BAT
Where P D is the power dissipated, V CC is the input supply
voltage, V BAT is the battery voltage and I BAT is the charge
current. It is not necessary to perform any worst-case
power dissipation scenarios because the LTC4065 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:
T A = 115 ° C – P D ? θ JA
T A = 115 ° C – (V CC – V BAT ) ? I BAT ? θ JA
Example: Consider an LTC4065/LTC4065A operating from
a 5V wall adapter providing 750mA to a 3.6V Li-Ion
battery. The ambient temperature above which the
LTC4065/LTC4065A will begin to reduce the 750mA charge
R PROG ≤
1
2 π ? 10 5 ? C PROG
current is approximately:
T A = 115 ° C – (5V – 3.6V) ? (750mA) ? 60 ° C/W
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
instantaneouscurrentpulses.Insuchacase,asimpleRC
filter can be used on the PROG pin to measure the average
T A = 115 ° C – 1.05W ? 60 ° C/W = 115 ° C – 63 ° C
T A = 52 ° C
The LTC4065/LTC4065A can be used above 70 ° C, but the
charge current will be reduced from 750mA. The approxi-
mate current at a given ambient temperature can be
calculated:
battery current as shown in Figure 4. A 10K resistor has
been added between the PROG pin and the filter capacitor
to ensure stability.
I BAT =
115 ° C – T A
( V CC – V BAT ) ? θ JA
LTC4065
PROG
10k
CHARGE
CURRENT
MONITOR
Using the previous example with an ambient temperature
of 73 ° C, the charge current will be reduced to approxi-
mately:
=
GND
R PROG
4065 F04
C FILTER
CIRCUITRY
I BAT =
115 ° C – 73 ° C 42 ° C
( 5 V – 3 . 6 V ) ? 60 ° C / W 84 ° C / A
= 500 mA
Figure 4. Isolating Capacitive Load on the PROG Pin and Filtering
4065fb
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4065EDC | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone 750mA Li-Ion Battery Charger in 2 】 2 DFN |
| LTC4065EDC#PBF | 制造商:Linear Technology 功能描述:BATTERY CHARGER LI-ION 750mA 制造商:Linear Technology 功能描述:BATTERY CHARGER, LI-ION, 750mA, DFN-6; Battery Type:Li-Ion; Input Voltage:5.5V; Battery Charge Voltage:4.2V; Charge Current Max:750mA; Battery IC Case Style:DFN; No. of Pins:6; No. of Series Cells:1; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
| LTC4065EDC#TR | 功能描述:IC CHARGER BATT LI-ON 6-DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4065EDC#TRM | 功能描述:IC CHARGER BATT LI-ON 6-DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4065EDC#TRMPBF | 功能描述:IC CHARGER BATT LI-ON 6-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
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