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| 型号： | LTC4009IUF-2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATTERY MC 20-QFN |
| 标准包装： | 91 |
| 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： | 管件 |
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LTC4009
LTC4009-1/LTC4009-2
APPLICATIONS INFORMATION
R F
C F 0.1μF
ProgrammingLTC4009-1/LTC4009-2OutputVoltage
The LTC4009-1/LTC4009-2 feature precision internal bat-
tery voltage feedback resistor taps configured for common
lithium-ion voltages. All that is required to program the
desired voltage is proper pin programming of FVS0 and
FVS1 as shown in Table 3.
FROM DC
POWER INPUT
C DC
10k
2 1
CLP CLN
R CL
LTC4009
5.1k
4009 F06
TO REMAINDER
OF SYSTEM
Table 3. LTC4009-1/LTC4009-2 Output Voltage Programming
V BAT VOLTAGE
Figure 6. Programming Input Current Limit
LTC4009-1
4.1V
LTC4009-2
4.2V
FVS1
GND
FVS0
GND
Table 4. Common R CL Values
8.2V
12.3V
16.4V
8.4V
12.6V
16.8V
GND
INTV DD
INTV DD
INTV DD
GND
INTV DD
ADAPTER
RATING
0.50A
0.75A
R CL VALUE (1%)
0.200 Ω
0.133 Ω
R CL POWER
DISSIPATION
0.050W
0.075W
R CL POWER
RATING
0.25W
0.25W
Programming Input Current Limit
1.00A
1.25A
0.100 Ω
0.080 Ω
0.100W
0.125W
0.25W
0.25W
R CL =
R F
1%
TO REMAINDER
OF SYSTEM
Q2
INTV DD 17
To set the input current limit, I LIM , the minimum wall
adapter current rating must be known. To account for the
tolerance of the LTC4009 input current sense circuit, 5%
should be subtracted from the adapter’s minimum rated
output. Refer to Figure 6 and program the input current
limit function with the following equation.
100mV
I LIM
where I LIM is the desired maximum current draw from
the DC (adapter) input, including adjustments for toler-
ance, if any.
Often an AC adapter will include a rated current output
margin of at least +10%. This can allow the adapter cur-
rent limit value to simply be programmed to the actual
minimum rated adapter output current. Table 4 shows
some common R CL current limit programming values.
A lowpass filter formed by R F (5.1k) and C F (0.1μF) is
required to eliminate switching noise from the LTC4009
PWM and other system components. If input current limit-
ing is not desired, CLN should be shorted to CLP while
CLP remains connected to power.
1.50A 0.067 Ω 0.150W 0.25W
1.75A 0.057 Ω 0.175W 0.25W
2.00A 0.050 Ω 0.200W 0.25W
Figure 7 shows an optional circuit that can influence the
parameters of the input current limit in two ways. The
first option is to lower the power dissipation of R CL at the
expense of accuracy without changing the input current
DCIN
D1
INPUT DIODE
CLP 2
C F
0.22μF R CL
LTC4009
2.49k 1%
CLN 1
R2
2SC2412
Q1
IMX1
R1 R3 = R1
1% 1%
4009 F07
Figure 7. Adjusting Input Current Limit
4009fd
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