PRODUCT DATASHEET
AAT2120
SwitchRegTM
500mA Low Noise Step-Down Converter
Output Voltage
R2 = 59kΩ
R1 (kΩ)
R2 = 221kΩ1
VOUT (V)
R1 (kΩ)
L1 (μH)
0.62
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.3
—
—
75
1.5
1.5
1.5
1.5
1.5
1.5
1.5
2.2
2.7
3.0/3.3
3.0/3.3
3.0/3.3
3.9/4.2
5.6
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
124
137
187
267
113
150
187
221
261
301
332
442
464
523
715
1000
Table 3: Evaluation Board Component Values.
Inductance
Max DC
Current (mA)
DCR
(mΩ)
Size (mm)
LxWxH
Manufacturer
Part Number
(μH)
Type
Sumida
Sumida
Sumida
Sumida
Sumida
Sumida
Sumida
Sumida
Sumida
Sumida
Sumida
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
FDK
CDRH2D14-1R5
CDRH2D14-2R2
CDRH2D14-2R7
CDRH2D14-3R3
CDRH2D14-3R9
CDRH2D14-4R7
CDRH2D14-5R6
CDRH2D11-1R5
CDRH2D11-2R2
CDRH2D11-3R3
CDRH2D11-4R7
NR3010
1.5
2.2
2.7
3.3
3.9
4.7
5.6
1.5
2.2
3.3
4.7
1.5
2.2
3.3
4.7
1.5
2.2
3
1800
1500
1350
1200
1100
1000
950
900
780
600
500
50
75
85
100
110
135
150
54
78
98
135
80
95
140
190
90
100
120
140
3.0x3.0x1.55
3.0x3.0x1.55
3.0x3.0x1.55
3.0x3.0x1.55
3.0x3.0x1.55
3.0x3.0x1.55
3.0x3.0x1.55
3.2x3.2x1.2
3.2x3.2x1.2
3.2x3.2x1.2
3.2x3.2x1.2
3.0x3.0x1.0
3.0x3.0x1.0
3.0x3.0x1.0
3.0x3.0x1.0
3.2x2.6x0.8
3.2x2.6x0.8
3.2x2.6x0.8
3.2x2.6x0.8
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Shielded
Chip shielded
Chip shielded
Chip shielded
Chip shielded
1200
1100
870
NR3010
NR3010
NR3010
750
MIPWT3226D-1R5
MIPWT3226D-2R2
MIPWT3226D-3R0
MIPWT3226D-4R2
1200
1100
1000
900
FDK
FDK
FDK
4.2
Table 4: Suggested Inductors and Suppliers.
Manufacturer
Part Number
Value (μF)
Voltage Rating
Temp. Co.
Case Size
Murata
Murata
GRM118R60J475KE19B
GRM188R60J106ME47D
4.7
10
6.3
6.3
X5R
X5R
0603
0603
Table 5: Surface Mount Capacitors.
1. For reduced quiescent current, R2 = 221kΩ.
2. R2 is opened, R1 is shorted.
w w w . a n a l o g i c t e c h . c o m
2120.2008.02.1.2
17
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