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| 型号： | AS1322B-BTTT |
| 厂商： | AUSTRIAMICROSYSTEMS AG |
| 元件分类： | DC/DC变换器 |
| 英文描述： | Adj., 315mA, 1.2 MHz, Boost; Package Type: TSOT23-6; Miscellaneous: with Continuous Switching |
| 中文描述： | 低电压，微功耗，型DC - DC升压转换器 |
| 封装： | TSOT23-6 |
| 文件页数： | 13/18页 |
| 文件大小： | 900K |
| 代理商： | AS1322B-BTTT |
wwwaustriamcrosystems.com/DC-DC_Step-Up/AS1322
Revision 1.09
13 - 18
AS1322
Datasheet - Application Information
Figure 22. Efficiency Comparison of Different Inductors, V
IN
= 1.5V, V
OUT
= 3.3V
90
9.2.2 Output Capacitor Selection
Low ESR capacitors should be used to mnimze V
OUT
ripple. Multi-layer ceramc capacitors are recommended since they have extremely low
ESR and are available in small footprints. A 2.2 to 10μF output capacitor is sufficient for most applications. Larger values up to 22μF may be
used to obtain extremely low output voltage ripple and improve transient response.
An additional phase lead capacitor may be required with output capacitors larger than 10μF to maintain acceptable phase margin. X5R and X7R
dielectric materials are recommended due to their ability to maintain capacitance over wide voltage and temperature ranges.
Input Capacitor Selection.
Low ESR input capacitors reduce input switching noise and reduce the peak current drawn fromthe battery.
Ceramc capacitors are recommended for input decoupling and should be located as close to the device as is practical. A 4.7μF input capacitor
is sufficient for most applications. Larger values may be used without limtations.
Diode Selection.
A Schottky diode should be used to carry the output current for the time it takes the PMOS synchronous rectifier to switch
on. For V
OUT
< 4.5V a Schottky diode is optional, although using one will increase device efficiency by 2 to 3%.
Note:
Do not use ordinary rectifier diodes, since the slow recovery times will compromse efficiency.
Table 6. Recommended Output Capacitor
Part Number
C
TC Code
Rated Voltage
Dimensions (L/W/T)
Manufacturer
Taiyo Yuden
JMK212BJ226MG-T22μF ±20%
X5R
6.3V
2x1.3x1.3mm
Table 7. Recommended Input Capacitor
Part Number
C
TC Code
Rated Voltage
Dimensions (L/W/T)
Manufacturer
GRM31CR70J106KA01L
10μF ±10%
X7R
6.3V
3.2x1.6x1.6mm
Murata
wwwmurata.com
100
10
76
78
80
82
84
86
88
90
92
Output Current (mA)
E
10uH - Coilcr af t (MOS6020-103ML)
10uH - Sumida(CDRH4D18-100)
6.8uH - Sumida(CDRH4D18-6R8)
6.8uH - Sumida(CR43-6R8)
4.7uH - Coilcr af t(MOS6020-472ML)
4.7 uH - Sumida(CDRH4D18-4R7)
3.3 uH - Coilcr af t(MOS6020-332ML)
S
i
8
40
45
50
55
60
65
70
75
80
85
0.1
1
10
Output Current (mA)
E
10uH - Coilcr af t (MOS6020-103ML)
10uH - Sumida(CDRH4D18-100)
6.8uH - Sumida(CDRH4D18-6R8)
6.8uH - Sumida(CR43-6R8)
4.7uH - Coilcr af t(MOS6020-472ML)
4.7 uH - Sumida(CDRH4D18-4R7)
3.3 uH - Coilcr af t(MOS6020-332ML)
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相关代理商/技术参数 |
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|---|---|
| AS1322-EB | 制造商:ams 功能描述:AS1322 Evaluation Board |
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| AS1323 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:1.6uA Quiescent Current, Single Cell, DC-DC Step-up Converter |
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| AS1323_1 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:1.6uA Quiescent Current, Single Cell, DC-DC Step-up Converter |
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