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参数资料
| 型号： | LTC4012IUF-3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC CTLR BATT CHARGER CC/CV 20QFN |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
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LTC4012-3
APPLICATIONS INFORMATION
1 . 2085 V ? ( R 1 + R 2 )
V BAT = , R 2 = R 2 A + R 2 B
? V BAT ?
R 1 = R 2 ? – 1 , R 2 = R 2 A + R 2 B
ThevalueofR PROG controlsthemaximumvalueofcharge
current which can be programmed (Q1 continuously on).
PWM of the Q1 gate voltage changes the value of R PROG
to produce lower currents. The frequency of this modula-
tion should be higher than a few kHz, and C PROG must be
increased to reduce the ripple caused by switching Q1. In
addition, it may be necessary to increase loop compensa-
tion 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 LTC4012-3 Output Voltage
Figure 5 shows the external circuit for programming the
charger output voltage. The voltage is then governed by
the following equation:
R 2
See Table 2 for approximate resistor values for R2.
? 1 . 2085 V ?
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 im-
pedance are not included in the specifications given in the
Electrical Characteristics. This leads to the possibility that
very accurate (0.1%) external resistors might be required.
Actually, the temperature rise of the LTC4012-3 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 Output Voltage
85
TYPICAL
BAT
FBDIV
11
10
V BAT
(V)
4.1
4.2
8.2
R1 (0.25%)
(k Ω)
165
167
162
R2A (0.25%)
(k Ω)
69
67.3
28
R2B (1%)*
(Ω)
–
200
–
LTC4012-3
V FB 9
GND
(EXPOSED PAD) 21
R1
R2A
R2B*
C Z
+
8.4
12.3
12.6
16.4
16.8
169
301
294
284
271
28.4
32.8
31.2
22.6
21
–
–
–
–
–
*OPTIONAL TRIM RESISTOR
4012-3 F05
20.5
21
316
298
19.8
18.2
–
–
Figure 5. Programming Output Voltage
24.6
25.2
298
397
15.4
20
–
–
*To Obtain Desired Accuracy Requires Series Resistors For R2.
40123fb
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