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參數(shù)資料
| 型號： | LTC3522EUD#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.85 A DUAL SWITCHING CONTROLLER, 1330 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, PLASTIC, M0-220WEED-2, QFN-16 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 270K |
| 代理商： | LTC3522EUD#TR |
LTC3522
14
3522f
Table 2. Buck Output Capacitor Range
VOUT
CMIN
CMAX
0.6V
15μF
300μF
0.8V
15μF
230μF
1.2V
10μF
150μF
1.8V
6.8μF
90μF
2.7V
6.8μF
70μF
3.3V
6.8μF
50μF
Buck Input Capacitor Selection
The PVIN2 pin provides current to the buck converter
power switch and is also the supply pin for the IC’s inter-
nal circuitry. It is recommended that a low ESR ceramic
capacitor with a value of at least 4.7μF be used to bypass
this pin. The capacitor should be placed as close to the
pin as possible and have a short return to ground.
Buck Output Voltage Programming
The output voltage is set by a resistive divider according
to the following formula:
VV
R
OUT =+
0 594
1
2
1
.
The external divider is connected to the output as shown in
Figure 3. It is recommended that a feedforward capacitor,
CFF,beplacedinparallelwithresistorR2inordertoimprove
the noise immunity of the feedback node. Table 3 provides
the recommended resistor and feedforward capacitor
combinations for common output voltage options.
Table 3. Buck Resistor Divider Values
VOUT
R1
R2
CFF
0.6V
–
0
–
0.8V
200k
69.8k
12pF
1.0V
118k
80.6k
12pF
1.2V
100k
102k
12pF
1.5V
78.7k
121k
12pF
1.8V
68.1k
137k
12pF
2.7V
63.4k
226k
18pF
3.3V
60.4k
274k
20pF
Buck-Boost Output Voltage Programming
The buck-boost output voltage is set by a resistive divider
according to the following formula:
VV
R
OUT =+
11
2
1
The external divider is connected to the output as shown
in Figure 4. The buck-boost converter utilizes voltage
mode control and the value of R2 plays an integral role
in the dynamics of the feedback loop. In general, a larger
value for R2 will increase stability and reduce the speed of
the transient response. A smaller value of R2 will reduce
stability but increase the transient response speed. A good
starting point is to choose R2 = 1M, and then calculate
the required value of R1 to set the desired output voltage
according to the formula given above. If a large output
capacitor is used, the bandwidth of the converter is reduced.
In such cases R2 can be reduced to improve the transient
APPLICATIONS INFORMATION
LTC3522
GND
0.6V
≤ VOUT ≤ 5.25V
FB2
R1
3522 F03
R2
CFF
Figure 3. Setting the Buck Output Voltage
LTC3522
GND
2.2V
≤ VOUT ≤ 5.25V
FB1
R1
3522 F04
R2
Figure 4. Setting the Buck-Boost Output Voltage
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