參數(shù)資料
型號(hào)： LTC4009IUF-1#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20
文件頁(yè)數(shù)： 9/28頁(yè)
文件大?。?/td> 351K
代理商： LTC4009IUF-1#PBF
4009fd
LTC4009
LTC4009-1/LTC4009-2
applicaTions inForMaTion
Programming LTC4009-1/LTC4009-2 Output Voltage
The LTC4009-1/LTC4009-2 feature precision internal bat-
teryvoltagefeedbackresistortapsconfiguredforcommon
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.
Table 3. LTC4009-1/LTC4009-2 Output Voltage Programming
VBAT VOLTAGE
FVS1
FVS0
LTC4009-1
LTC4009-2
4.1V
4.2V
GND
8.2V
8.4V
GND
INTVDD
12.3V
12.6V
INTVDD
GND
16.4V
16.8V
INTVDD
Programming Input Current Limit
To set the input current limit, ILIM, 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.
R
mV
I
CL
LIM
=
100
where ILIM 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 RCL current limit programming values.
A lowpass filter formed by RF (5.1k) and CF (0.1F) 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.
Table 4. Common RCL Values
ADAPTER
RATING
RCL VALUE (1%)
RCL POWER
DISSIPATION
RCL POWER
RATING
0.50A
0.200
Ω
0.050W
0.25W
0.75A
0.133
Ω
0.075W
0.25W
1.00A
0.100
Ω
0.100W
0.25W
1.25A
0.080
Ω
0.125W
0.25W
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 RCL at the
expense of accuracy without changing the input current
Figure 6. Programming Input Current Limit
2
1
RCL
CDC
CF 0.1F
CLP
LTC4009
CLN
RF
5.1k
4009 F06
10k
FROM DC
POWER INPUT
TO REMAINDER
OF SYSTEM
2
1
CLP
DCIN
CLN
17
INTVDD
LTC4009
RCL
1%
R3 = R1
1%
R1
1%
Q2
2SC2412
RF
2.49k 1%
R2
Q1
IMX1
4009 F07
CF
0.22F
D1
INPUT DIODE
TO REMAINDER
OF SYSTEM
Figure 7. Adjusting Input Current Limit
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