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AAT2510 Datasheet, PDF (14/19 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
2.5V Output Capacitor
COUT
=
3 · ÎILOAD
VDROOP · FS
=
3 · 0.3A
0.2V · 1MHz
=
4.5μF
IRMS(MAX)
=
1
2·
3
·
(VOUT) ·
L
(VIN(MAX) - VOUT)
· F · VIN(MAX)
=
1 · 2.5V · (4.2V - 2.5V)
2· 3 10μH · 1MHz · 4.2V
= 29mArms
Pesr = esr · IRMS2 = 5mΩ · (29mA)2 = 4.2μW
1.8V Output Capacitor
COUT
=
3 · ÎILOAD
VDROOP · FS
=
3 · 0.3A
0.2V · 1MHz
=
4.5μF
IRMS(MAX)
=
1
2·
3
·
(VOUT) ·
L
(VIN(MAX) - VOUT)
· F · VIN(MAX)
=
1 · 1.8V · (4.2V - 1.8V) = 63mArms
2· 3 4.7μH · 1.0MHz · 4.2V
Pesr = esr · IRMS2 = 5mΩ · (63mA)2 = 20μW
Input Capacitor
Input Ripple VPP = 25mV.
1
1
CIN =
â VPP
â IO1 + IO2
- ESRââ ⢠4 ⢠FS
=
â 25mV
â 0.8A
= 9.5μF
- 5mΩââ ⢠4 ⢠1MHz
I = RMS(MAX)
IO1 + IO2
2
= 0.4Arms
P = esr · IRMS2 = 5mΩ · (0.4A)2 = 0.8mW
Skyworks Solutions, Inc. ⢠Phone [781] 376-3000 ⢠Fax [781] 376-3100 ⢠sales@skyworksinc.com ⢠www.skyworksinc.com
14
202020B ⢠Skyworks Proprietary Information ⢠Products and Product Information are Subject to Change Without Notice. ⢠March 19, 2013
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