AAT1143
1MHz 400mA Step-Down Converter
Ω
Ω
VOUT (V)
R1 (k )
R1 (k )
L1 (μH)
Adjustable Version
1
R2 = 59kΩ
R2 = 221kΩ
(0.6V device)
0.8
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
75.0
113
150
187
221
261
301
332
442
464
523
715
4.7
4.7
0.9
1.0
4.7
1.1
4.7
1.2
4.7
1.3
4.7
1.4
4.7
1.5
4.7
1.8
4.7
1.85
2.0
124
4.7
137
4.7 or 6.8
10
2.5
187
VOUT (V)
R1 (kΩ)
L1 (μH)
Fixed Version
R2 Not Used
0.6-3.3V
0
4.7
Table 3: Evaluation Board Component Values.
Inductance
Max DC
Current (A)
DCR
(Ω)
Size (mm)
LxWxH
Manufacturer
Part Number
(μH)
Type
Sumida
CDRH3D16-4R7
CDRH3D16-100
LQH32CN4R7M23
LQH32CN4R7M33
LQH32CN4R7M53
LPO6610-472
LPO3310-472
SDRC10-4R7
4.7
10
0.90
0.55
0.45
0.65
0.65
1.10
0.80
1.53
1.30
0.98
1.77
0.11
0.21
3.8x3.8x1.8
3.8x3.8x1.8
2.5x3.2x2.0
2.5x3.2x2.0
2.5x3.2x1.55
5.5x6.6x1.0
3.3x3.3x1.0
4.5x3.6x1.0
5.7x4.4x1.0
3.1x3.1x1.85
5.2x5.2x1.8
Shielded
Shielded
Sumida
MuRata
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
0.20
Non-Shielded
Non-Shielded
Non-Shielded
1mm
MuRata
0.15
MuRata
0.15
Coilcraft
Coilcraft
Coiltronics
Coiltronics
Coiltronics
Coiltronics
0.20
0.27
1mm
0.117
0.122
0.122
0.082
1mm Shielded
1mm Shielded
Shielded
SDR10-4R7
SD3118-4R7
SD18-4R7
Shielded
Table 4: Typical Surface Mount Inductors.
1. For reduced quiescent current R2 = 221kΩ.
1143.2006.07.1.10
17
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