AAT1155 Datasheet, PDF (15/17 Pages) Advanced Analogic Technologies – 1MHz 2.5A Step-Down DC/DC Converter

AAT1155
1MHz 2.5A Step-Down DC/DC Converter
Adjustable Output
For applications requiring an output other than the
fixed outputs available, the 1V version can be pro-
grammed externally. Resistors R3 and R4 of
Figure 1 force the output to regulate higher than
1 volt. For accurate results (less than 1% error for
all outputs), select R4 to be 10kΩ. Once R4 has
been selected, R3 can be calculated. For a 1.25
volt output with R4 set to 10kΩ, R3 is 2.5kΩ.
R3 = (V_O - 1) · R4 = 0.25 · 10kΩ = 2.5kΩ
Capacitors
Part Number
C4532X5ROJ107M
GRM43-2 X5R 107M 6.3
GRM43-2 X5R 476K 6.3
GRM42-6 X5R 106K 6.3
594D127X_6R3C2T
595D107X0016C
Manufacturer
TDK
MuRata
MuRata
MuRata
Vishay
Vishay
Capacitance
(µF)
100
100
47
10
120
100
Voltage
(V)
6.3
6.3
6.3
6.3
6.3
16
Temp Co.
X5R
X5R
X5R
X5R
Case
1812
1812
1812
1206
C
C
Inductors
Part Number
Manufacturer
CDRH6D38-4763-T055
N05D B1R5M
NP06DB B1R5M
LQH55DN1R5M03
LQH66SN1R5M03
Sumida
Taiyo Yuden
Taiyo Yuden
MuRata
MuRata
Inductance
(µH)
1.5
1.5
1.5
1.5
1.5
I
(Amps)
4.0
3.2
3.0
3.7
3.8
DCR
(Ω)
0.014
0.025
0.022
0.022
0.016
Height
(mm)
4.0
2.8
3.2
4.7
4.7
Type
Shielded
Non-Shielded
Shielded
Non-Shielded
Shielded
Diodes
Manufacturer
Diodes Inc.
ROHM
Micro Semi
Part Number
B340LA
RB050L-40
5820SM
V_F
0.45V @ 3A
0.45 @ 3A
0.46V @ 3A
1155.2005.11.1.6
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