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| 型号： | AS1324-BTTT-18 |
| 厂商： | AUSTRIAMICROSYSTEMS AG |
| 元件分类： | DC/DC变换器 |
| 英文描述： | 600mA Buck Converter; Package Type: TSOT23-5; Output Range: 1.8V |
| 封装： | TSOT23-5 |
| 文件页数： | 12/20页 |
| 文件大小： | 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
LQH32CN4R7M334.7μH
650mA
3.2x2.5x2.0mm
LPS3008-222MLC
2.2μH
1100mA
3.1x3.1x0.8mm
Coilcraft
wwwcoilcraft.com
LPS3015-222MLC
2.2μH
2000mA
3.1x3.1x1.5mm
MOS6020-222MLC
2.2μH
3260mA
6.0x6.8x2.4mm
MOS6020-472MLC
4.7μH
1820mA
6.0x6.8x2.4mm
CDRH3D16NP-2R2N
2.2μH
1200mA
4.0x4.0x1.8mm
Sumda
wwwsumda.com
CDRH3D16ND-4R7N
4.7μH
900mA
4.0x4.0x1.8mm
70
75
80
85
90
95
1
10
100
1000
Output Current (mA)
E
.
LQH32CN2R2
LPS3015-222
LQH32CN4R7
LPS3008-222
MOS6020-222
MOS6020-472
70
75
80
85
90
95
1
10
100
1000
Output Current (mA)
E
.
LQH32CN2R2
LPS3015-222
LQH32CN4R7
LPS3008-222
MOS6020-222
MOS6020-472
V
OUT
= 1.8V
V
OUT
= 1.2V
(EQ 4)
I
RMSC
OUT
V
OUT
1
-----------------------
V
L
×
--------------
–
f
2
3
×
----------------
×
×
=
(EQ 5)
Δ
V
OUT
V
OUT
1
-----------------------
--------------
–
f
8
C
OUT
×
f
×
--------------------------------
ESR
+
×
×
=
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