- 您现在的位置：买卖IC网 > PDF目录1833 > LTC4012IUF-3#TRPBF (Linear Technology)IC CTLR BATT CHARGER CC/CV 20QFN PDF资料下载
参数资料
| 型号： | LTC4012IUF-3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | IC CTLR BATT CHARGER CC/CV 20QFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 多化学 |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
LTC4012-3
APPLICATIONS INFORMATION
I CHRG =
? ?
– 11 . 67 μA ?
ProgrammingChargeCurrent
The formula for charge current is:
R IN ? 1 . 2085 V ?
R SENSE ? R PROG ?
The LTC4012-3 operates best with 3.01k input resistors,
although other resistors near this value can be used to
accommodate standard sense resistor values. Refer to
the subsequent discussion on inductor selection for other
considerations that come into play when selecting input
resistors R IN .
R SENSE should be chosen according to the following
equation:
However, some batteries require a low charge current for
initial conditioning when they are heavily discharged. The
charge current can then be safely switched to a higher
level after conditioning is complete. Figure 3 illustrates
one method of doing this with 2-level control of the PROG
pin resistance. Turning Q1 off reduces the charge current
to I MAX /10 for battery conditioning. When Q1 is on, the
LTC4012-3 is programmed to allow full I MAX current for
bulk charge. This technique can be expanded through
the use of additional digital control inputs for an arbitrary
number of pre-programmed current values.
For a truly continuous range of maximum charge current
control, pulse width modulation can be used as shown
in Figure 4.
R SENSE =
100mV
I MAX
LTC4012-3
BULK
C PROG
4.7nF
whereI MAX isthedesiredmaximumchargecurrentI CHRG .
The 100mV target can be adjusted to some degree to obtain
standard R SENSE values and/or a desired R PROG value, but
target voltages lower than 100mV will cause a proportional
reduction in current regulation accuracy.
The required minimum resistance between PROG and GND
can be determined by applying the suggested expression
for R SENSE while solving the first equation given above for
charge current with I CHRG = I MAX :
PROG
13
R1
26.7k
CHARGE
Q1 R2
PRECHARGE 2N7002 53.6k
4012-3 F03
Figure 3. Programming 2-Level Charge Current
R PROG ( MIN ) =
1 . 2085 V ? R IN
0 . 1 V + 11 . 67 μA ? R IN
LTC4012-3
PROG
If R IN is chosen to be 3.01k with a sense voltage of 100mV,
this equation indicates a minimum value for R PROG of
26.9k. Table 6 gives some examples of recommended
charge current programming component values based
on these equations.
5V
0V
13
R PROG
Q1
2N7002
C PROG
R MAX
511k
The resistance between PROG and GND can simply be
set with a single a resistor, if only maximum charge cur-
rent needs to be controlled during the desired charging
algorithm.
4012-3 F04
Figure 4. Programming PWM Current
40123fb
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4050EMS-4.1#TR | IC BATT CHRG CNTRL LI-ION 10MSOP |
| LTC4052EMS8E-4.2#TRPBF | IC CHARGER PULSE LI-ION 8-MSOP |
| LTC4053EDD-4.2#TRPBF | IC CHARGER BATTERY USB 10-DFN |
| LTC4054ES5-4.2#TRMPBF | IC CHARGR BATTERY L-ION TSOT23-5 |
| LTC4055EUF-1#TRPBF | IC USB PWR MNGR BATT CHRGR 16QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4020EUHF#PBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4020EUHF#TRPBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4020IUHF#PBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4020IUHF#TRPBF | 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes |
| LTC4050 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN |
发布紧急采购，3分钟左右您将得到回复。