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参数资料
| 型号： | LTC4009IUF#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： | 8/28页 |
| 文件大小： | 351K |
| 代理商： | LTC4009IUF#PBF |
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LTC4009
LTC4009-1/LTC4009-2
4009fd
applicaTions inForMaTion
compensation capacitance connected to ITH to maintain
stability or prevent large current overshoot during start-
up. Selecting a higher Q1 PWM frequency (≈10kHz) will
reduce the need to change CPROG or other compensation
values.Chargecurrentwillbeproportionaltothedutycycle
of the PWM input on the gate of Q1.
Programming LTC4009 Output Voltage
Figure 5 shows the external circuit for programming the
charger voltage when using the LTC4009. The voltage is
then governed by the following equation:
V
V R R
R
R A R B
BAT =
+
(
)
=
+
1 2085
1
2
.
,
See Table 2 for approximate resistor values for R2.
R
V
R
R A R B
1
2
1 2085
1
2
=
=
+
VBAT
.
– ,
Selecting R2 to be less than 50k and the sum of R1 and
R2 at least 200k or above, achieves the lowest possible
error at the VFB sense input. Note that sources of error
such as R1 and R2 tolerance, FBDIV RON or VFB input
impedance are not included in the specifications given in
the Electrical Characteristics. This leads to the possibil-
ity that very accurate (0.1%) external resistors might be
required. Actually, the temperature rise of the LTC4009 will
rarely exceed 50°C at the end of charge, because charge
current will have tapered to a low level. This means that
0.25% resistors will normally provide the required level of
overall accuracy. Table 2 gives recommended values for
R1 and R2 for popular lithium-ion battery voltages. For
values of R1 above 200k, addition of capacitor CZ may
improve transient response and loop stability. A value of
10pF is normally adequate.
Table 2. Programming LTC4009 Output Voltage
VBAT VOLTAGE
R1 (0.25%)
R2A (0.25%)
R2B (1%)*
4.1V
165k
69.0k
–
4.2V
167k
67.3k
200
8.2V
162k
28.0k
–
8.4V
169k
28.4k
–
12.3V
301k
32.8k
–
12.6V
294k
31.2k
–
16.4V
284k
22.6k
–
16.8V
271k
21.0k
–
20.5V
316k
19.8k
–
21.0V
298k
18.2k
–
24.6V
298k
15.4k
–
25.2V
397k
20.0k
–
*To obtain required accuracy requires series resistors for R2.
Figure 4. Programming PWM Current
Figure 5. Programming LTC4009 Output Voltage
13
Q1
2N7002
4009 F04
PROG
LTC4009
RPROG
RMAX
511k
CPROG
0V
5V
11
9
BAT
FBDIV
95
TYPICAL
10
VFB
LTC4009
R1
R2A
R2B*
4009 F05
CZ
*OPTIONAL TRIM RESISTOR
21
GND
(EXPOSED PAD)
+
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4009CUF-1#TRPBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009CUF-2#TRPBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009IUF-1#PBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009CUF-2#PBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009CUF-1#PBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
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