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AAT2510 Datasheet, PDF (13/19 Pages) Advanced Analogic Technologies – Dual 400mA, 1MHz Step-Down DC-DC Converter | |||
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DATA SHEET
AAT2510
Dual 400mA, 1MHz Step-Down DC/DC Converter
Design Example
Specifications
VO1 = 2.5V @ 400mA (adjustable using 0.6V version), pulsed load ïILOAD = 300mA
VO2 = 1.8V @ 400mA (adjustable using 0.6V version), pulsed load ïILOAD = 300mA
VIN = 2.7V to 4.2V (3.6V nominal)
FS = 1.0 MHz
TAMB = 85°C
2.5V VO1 Output Inductor
μsec
μsec
L1 = 3 A â
VO1 = 3 A â
2.5V = 7.5μH (see Table 1)
For Sumida inductor CDRH3D16, 10μH, DCR = 210mï.
ÎI1 =
VO
L1 â
F
â
ââ1
-
VO1â
VIN â
=
2.5V
10μH â
1.0MHz
â
â
â1
-
2.5Vâ
4.2Vâ
= 100mA
IPK1
=
IO1
+
ÎI1
2
=
0.4A
+
0.05A
=
0.45A
PL1 = IO12 â
DCR = 0.4A2 â
210mΩ = 34mW
1.8V VO2 Output Inductor
μsec
μsec
L2 = 3 A â
VO2 = 3 A â
1.8V = 5.4μH (see Table 1)
For Sumida inductor CDRH3D16, 4.7μH, DCR = 105mï.
ÎI2 =
VO2
Lâ
F
â
ââ1
-
VO2 â
VIN â
=
1.8V
4.7μH â
1.0MHz
â
â
â1
-
1.8V â
4.2Vâ
= 218mA
IPK2
=
IO2
+
ÎI2
2
=
0.4A
+
0.11A
=
0.51A
PL2 = IO22 â
DCR = 0.4A2 â
105mΩ = 17mW
Skyworks Solutions, Inc. ⢠Phone [781] 376-3000 ⢠Fax [781] 376-3100 ⢠sales@skyworksinc.com ⢠www.skyworksinc.com
202020B ⢠Skyworks Proprietary Information ⢠Products and Product Information are Subject to Change Without Notice. ⢠March 19, 2013
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