AS1324-AD EB austriamicrosystems, AS1324-AD EB Datasheet - Page 12

• Manufacturer Part Number: AS1324-AD EB
• Description: BOARD EVAL AS1324-AD
• Manufacturer: austriamicrosystems

Specifications of AS1324-AD EB

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.8V
• Current - Output: 600mA
• Voltage - Input: 2.7 ~ 5.5 V
• Regulator Topology: Buck
• Frequency - Switching: 1.5MHz
• Board Type: Fully Populated
• Utilized Ic / Part: AS1324-AD
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Power - Output: -

AS1324
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Table 5. Recommended Inductors
Figure 26. Efficiency Comparison of Different Inductors, V
9.3 Output Capacitor Selection
The advanced fast-response voltage mode control scheme of the AS1324 allows the use of tiny ceramic capacitors. Because of their lowest
output voltage ripple low ESR ceramic capacitors are recommended. X7R or X5R dielectric output capacitor are recommended.
At high load currents, the device operates in PWM mode and the RMS ripple current is calculated as:
While operating in PWM mode the overall output voltage ripple is the sum of the voltage spike caused by the output capacitor ESR plus the
voltage ripple caused by charging and discharging the output capacitor:
Higher value, low cost ceramic capacitors are available in very small case sizes, and their high ripple current, high voltage rating, and low ESR
make them ideal for switching regulator applications. Because the AS1324 control loop is not dependant on the output capacitor ESR for stable
operation, ceramic 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 minimize the voltage ripple in powersave mode and tighten DC output accuracy in
powersave mode.
www.austriamicrosystems.com/DC-DC_Step-Down/AS1324
CDRH3D16NP-2R2N
CDRH3D16ND-4R7N
MOS6020-222MLC
MOS6020-472MLC
LQH32CN2R2M33
LQH32CN4R7M33
LPS3008-222MLC
LPS3015-222MLC
95
90
85
80
75
70
Part Number
1
V
OUT
= 1.8V
Output Current (mA)
10
LQH32CN2R2
LPS3015-222
LQH32CN4R7
2.2µH
4.7µH
2.2µH
2.2µH
2.2µH
4.7µH
2.2µH
4.7µH
L
ΔV
OUT
100
I
RMSC
LPS3008-222
M OS6020-222
M OS6020-472
=
150mΩ
175mΩ
110mΩ
105mΩ
97mΩ
35mΩ
50mΩ
72mΩ
DCR
V
OUT
OUT
IN
×
=
= 2.7V, V
1
----------------------- -
1000
V
–
OUT
L
Current Rating
V
--------------
Revision 1.05
×
V
OUT
OUT
IN
f
1100mA
2000mA
3260mA
1820mA
1200mA
790mA
650mA
900mA
×
1
----------------------- -
×
= 1.8V and 1.2V
–
L
⎛
⎝
V
--------------
------------------------------- -
8 C
×
V
95
90
85
80
75
70
OUT
×
IN
f
1
V
OUT
1
×
OUT
---------------- -
2
Dimensions (L/W/T)
×
×
= 1.2V
1
3.2x2.5x2.0mm
3.2x2.5x2.0mm
3.1x3.1x0.8mm
3.1x3.1x1.5mm
6.0x6.8x2.4mm
6.0x6.8x2.4mm
4.0x4.0x1.8mm
4.0x4.0x1.8mm
LQH32CN2R2
LPS3015-222
LQH32CN4R7
f
3
+
ESR
Output Current (mA)
10
⎞
⎠
LPS3008-222
M OS6020-222
M OS6020-472
Murata
www.murata.com
Coilcraft
www.coilcraft.com
Sumida
www.sumida.com
100
Manufacturer
1000
12 - 20
(EQ 4)
(EQ 5)