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参数资料
| 型号： | LTC4009IUF-2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/28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
LTC4009
PROG
95
TYPICAL
BAT
11
13
FBDIV
9
R PROG
R MAX
511k
LTC4009
R1
C Z
5V
0V
Q1
2N7002
C PROG
4009 F04
V FB 10
R2A
R2B*
+
GND
(EXPOSED PAD) 21
Figure 4. Programming PWM Current
*OPTIONAL TRIM RESISTOR
4009 F05
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 C PROG or other compensation
values.Charge current will be proportional to the duty cycle
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:
Figure 5. Programming LTC4009 Output Voltage
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 C Z may
improve transient response and loop stability. A value of
10pF is normally adequate.
Table 2. Programming LTC4009 Output Voltage
V BAT =
1.2085 V ? ( R1 + R2 )
R 2
, R 2 = R 2 A + R 2 B
V BAT VOLTAGE
4.1V
4.2V
R1 (0.25%)
165k
167k
R2A (0.25%)
69.0k
67.3k
R2B (1%)*
–
200
See Table 2 for approximate resistor values for R2.
8.2V
162k
28.0k
–
R 1 = R 2 ?
– 1 ? , R 2 = R 2 A + R 2 B
? V BAT
? 1 . 2085 V
?
?
8.4V
12.3V
12.6V
169k
301k
294k
28.4k
32.8k
31.2k
–
–
–
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 V FB sense input. Note that sources of error
such as R1 and R2 tolerance, FBDIV R ON or V FB 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
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.
–
–
–
–
–
–
4009fd
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