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| AAT2315_07 Datasheet, PDF (17/22 Pages) Advanced Analogic Technologies – Dual 600mA Step-Down Converter with Synchronization | |||
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AAT2513
Dual 600mA Step-Down
Converter with Synchronization
1.8V Output Capacitor
COUT
=
3 · ÎILOAD
VDROOP · FS
=
3 · 0.3A
0.2V · 1.7MHz
= 4.8µF
IRMS(MAX)
=
1
2·
3
·
(VOUT) · (VIN(MAX) - VOUT)
L · F · VIN(MAX)
=
1 · 1.8V · (4.2V - 1.8V)
2· 3 2.2µH · 1.7MHz · 4.2V
= 31mArms
Pesr = esr · IRMS2 = 5mΩ · (31mA)2 = 4.8µW
2.5V Output Capacitor
COUT
=
3 · ÎILOAD
VDROOP · FS
=
3 · 0.3A
0.2V · 1.7MHz
= 4.8µF
IRMS(MAX)
=
1
2·
3
·
(VOUT) · (VIN(MAX) - VOUT)
L · F · VIN(MAX)
=
1 · 2.5V · (4.2V - 2.5V)
2· 3 3.3µH · 1.7MHz · 4.2V
= 67mArms
Pesr = esr · IRMS2 = 5mΩ · (67mA)2 = 22µW
Input Capacitor
Input Ripple VPP = 25mV.
1
1
CIN =
â VPP
â IO1 + IO2
- ESRââ · 4 · FS
=
= 10µF
â 25mV
â 1.2A
- 5mΩââ · 4 · 1.7MHz
I = RMS(MAX)
IO1 + IO2
2
= 0.6Arms
P = esr · IRMS2 = 5mΩ · (0.6A)2 = 0.8mW
2513.2007.04.1.1
17
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