参数资料
| 型号： | LTC4069EDC#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI-ION 6-DFN |
| 标准包装： | 2,500 |
| 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) |
LTC4069
APPLICATIONS INFORMATION
750mA
BAT
I CHG
D1
+
Li-Ion
500mA
BATTERY
R PROG ≤
2 π ? 10 ? C PROG
10k
PROG
C FILTER
R PROG
with low impedance leads. Excessive lead length, however,
may add enough series inductance to require a bypass
capacitor of at least 1μF from BAT to GND. Furthermore,
a 4.7μF capacitor with a 0.2Ω to 1Ω 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 ceram-
ic) may reduce the constant-voltage loop phase margin.
Ceramic capacitors up to 22μF may be used in parallel
with a battery, but larger ceramics should be decoupled
with 0.2Ω to 1Ω 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, additional capacitance on
this node reduces the maximum allowed program resis-
tor. 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 resistance value for R PROG :
1
5
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 5. A 10k resistor has
been added between the PROG pin and the filter capacitor
to ensure stability.
5V WALL
ADAPTER I CHG
SYSTEM
LOAD
LTC4069
USB V CC
POWER MP1
PROG
I CHG
MN1 4.02k
2k
1k
4069 F04
Figure 4. Combining Wall Adapter and USB Power
LTC4069 CHARGE
CURRENT
MONITOR
GND CIRCUITRY
4069 F05
Figure 5. Isolating Capacitive Load on the PROG Pin and Filtering
Power Dissipation
The conditions that cause the LTC4069 to reduce charge
current through thermal feedback can be approximated
by considering the power dissipated in the IC. For high
charge currents, the LTC4069 power dissipation is ap-
proximately:
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 LTC4069 will
automatically reduce the charge current to maintain the
die temperature at approximately 115°C. However, the
13
For more information www.linear.com/LTC4069
4069fc
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相关代理商/技术参数 |
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| LTC4070 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Ultralow Voltage Step-Up Converter and Power Manager |
| LTC4070EDDB | 制造商:LINER 制造商全称:Linear Technology 功能描述:Li-Ion/Polymer Shunt Battery Charger System |
| LTC4070EDDB#PBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 50mA 4.2V 10-Pin DFN EP Bulk 制造商:Linear Technology 功能描述:IC BATTERY CHARGER 50mA DFN-8 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 50mA, DFN-8 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 50mA, DFN-8; Battery Type:Li-Ion, Li-Polymer; Battery Charge Voltage:4.2V; Charge Current Max:50mA; Battery IC Case Style:DFN; No. of Pins:8; No. of Series Cells:1; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
| LTC4070EDDB#TRMPBF | 功能描述:IC LI-ION/POLY BATT CHARGER 8DFN 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 |
| LTC4070EDDB#TRPBF | 功能描述:IC BATT CHRGR LIION/POLY 8DFN RoHS:是 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 |
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