參數(shù)資料
型號： AS1324-BTTT-18
廠商： AUSTRIAMICROSYSTEMS AG
元件分類： DC/DC變換器
英文描述： 600mA Buck Converter; Package Type: TSOT23-5; Output Range: 1.8V
封裝： TSOT23-5
文件頁數(shù)： 12/20頁
文件大?。?/td> 970K
代理商： AS1324-BTTT-18
wwwaustriamcrosystems.com/DC-DC_Step-Down/AS1324
Revision 1.05
12 - 20
AS1324
Datasheet - Application Information
Figure 26. Efficiency Comparison of Different Inductors, V
IN
= 2.7V, V
OUT
= 1.8V and 1.2V
9.3 Output Capacitor Selection
The advanced fast-response voltage mode control scheme of the AS1324 allows the use of tiny ceramc capacitors. Because of their lowest
output voltage ripple low ESR ceramc capacitors are recommended. X7R or X5R dielectric output capacitor are recommended.
At high load currents, the device operates in PWMmode and the RMS ripple current is calculated as:
While operating in PWMmode the overall output voltage ripple is the sumof the voltage spike caused by the output capacitor ESR plus the
voltage ripple caused by charging and discharging the output capacitor:
V
L
×
Higher value, low cost ceramc capacitors are available in very small case sizes, and their high ripple current, high voltage rating, and low ESR
make themideal for switching regulator applications. Because the AS1324 control loop is not dependant on the output capacitor ESR for stable
operation, ceramc capacitors can be used to achieve very low output ripple and accommodate small circuit size.
At light loads, the converter operates in powersave mode and the output voltage ripple is in direct relation to the output capacitor and inductor
value used. Larger output capacitor and inductor values mnimze the voltage ripple in powersave mode and tighten DC output accuracy in
powersave mode.
Table 5. Recommended Inductors
Part Number
L
DCR
97m
Ω
150m
Ω
175m
Ω
110m
Ω
35m
Ω
50m
Ω
72m
Ω
105m
Ω
Current Rating
Dimensions (L/W/T)
Manufacturer
LQH32CN2R2M33
2.2μH
790mA
3.2x2.5x2.0mm
Murata
LQH32CN4R7M33
相關(guān)PDF資料
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AS1329A-BTTT Adj. 315mA, 1.2MHz Boost feed.; Package Type: TSOT23-6; Miscellaneous: (medium loads); Miscellaneous: Powersave Operation
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參數(shù)描述
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