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| 型号： | LTC4009CUF-2#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20 |
| 文件页数： | 7/28页 |
| 文件大小： | 351K |
| 代理商： | LTC4009CUF-2#PBF |
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4009fd
LTC4009
LTC4009-1/LTC4009-2
applicaTions inForMaTion
Programming Charge Current
The formula for charge current is:
I
R
V
R
A
CHRG
IN
SENSE
PROG
=
.
– .
1 2085
11 67
The LTC4009 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 RIN.
RSENSE should be chosen according to the following
equation:
R
mV
I
SENSE
MAX
=
100
where IMAX is the desired maximum charge current ICHRG.
The100mVtargetcanbeadjustedtosomedegreetoobtain
standard RSENSE values and/or a desired RPROG value, but
targetvoltageslowerthan100mVwillcauseaproportional
reduction in current regulation accuracy.
TherequiredminimumresistancebetweenPROGandGND
can be determined by applying the suggested expression
for RSENSE while solving the first equation given above for
charge current with ICHRG = IMAX:
R
V R
V
A R
PROG MIN
IN
(
)
.
.
=
+
1 2085
0 1
11 67
If RIN is chosen to be 3.01k with a sense voltage of 100mV,
this equation indicates a minimum value for RPROG of
26.9k. Table 6 gives some examples of recommended
charge current programming component values based
on these equations.
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. However, some batteries require a low charge
current for initial conditioning when they are heavily dis-
charged. 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 IMAX/10 for battery conditioning. When
Q1 is on, the LTC4009 is programmed to allow full IMAX
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.
Figure 3. Programming 2-Level Charge Current
13
Q1
2N7002
4009 F03
R2
53.6k
PROG
LTC4009
R1
26.7k
CPROG
4.7nF
BULK
CHARGE
PRECHARGE
For a truly continuous range of maximum charge current
control, pulse width modulation can be used as shown in
Figure 4. The value of RPROG controls the maximum value
of charge current which can be programmed (Q1 continu-
ously on). PWM of the Q1 gate voltage changes the value
of RPROG to produce lower currents. The frequency of this
modulation should be higher than a few kHz, and CPROG
must be increased to reduce the ripple caused by switch-
ing Q1. In addition, it may be necessary to increase loop
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4009CUF-2-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger |
| LTC4009CUF-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger |
| LTC4009CUF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger |
| LTC4009IUF#PBF | 功能描述:IC CHARGER BATTERY MC 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC4009IUF#TRPBF | 功能描述:IC CTLR BATT CHARGER 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
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