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| AAT2511 Datasheet, PDF (15/20 Pages) Advanced Analogic Technologies – Dual 600mA, 1MHz Step-Down DC/DC Converter | |||
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AAT2511
Dual 600mA, 1MHz Step-Down DC/DC Converter
2.5V Output Capacitor
COUT
=
3 · âILOAD
VDROOP · FS
=
3 · 0.6A
0.2V · 1MHz
= 9µF
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 = 5m⦠· (29mA)2 = 4.2µW
1.8V Output Capacitor
COUT
=
3 · âILOAD
VDROOP · FS
=
3 · 0.6A
0.2V · 1MHz
= 9µF
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 = 5m⦠· (63mA)2 = 20µW
Input Capacitor
Input Ripple VPP = 25mV.
1
1
CIN =
â VPP
â IO1 + IO2
- ESRââ · 4 · FS
=
= 15.78µF
â
â
25mV
1.2A
- 5mâ¦ââ · 4 · 1MHz
I = RMS(MAX)
IO1 + IO2
2
= 6Arms
P = esr · IRMS2 = 5m⦠· (0.6A)2 = 1.8mW
2511.2006.02.1.2
15
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