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AAT2500 Datenblatt(PDF) 21 Page - Advanced Analogic Technologies

Teilenummer AAT2500
Bauteilbeschribung  1MHz Step-Down Converter/LDO Regulator
PDF  26 Pages
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Hersteller  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

AAT2500 Datenblatt(HTML) 21 Page - Advanced Analogic Technologies

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Input Capacitor
Input Ripple VPP = 25mV
AAT2500 Losses
T
J(MAX) = TAMB +
ΘJA · PLOSS = 85
°C + (50°C/W) · 392mW = 105°C
PTOTAL
+ (tsw · F · IOBUCK + IQBUCK + IQLDO) · VIN + (VIN - VLDO) · ILDO
IOBUCK2 · (RDSON(HS) · VOBUCK + RDSON(LS) · [VIN - VOBUCK])
VIN
=
=
+ (5ns · 1.0MHz · 0.4A + 50μA +125μA) · 4.2V + (4.2V - 3.3V) · 0.3A = 392mW
0.42 · (0.725
Ω · 1.8V + 0.7Ω · [4.2V - 1.8V])
4.2V
IOBUCK
RMS
I
P = esr · IRMS2 = 5mΩ · (0.2A)2 = 0.2mW
2
=
= 0.2Arms
CIN =
=
= 4.75μF
1
⎛⎞
- ESR ·
4 · FS
⎝⎠
VPP
IOBUCK
1
⎛⎞
- 5mΩ ·
4 · 1MHz
⎝⎠
25mV
0.4A
AAT2500
1MHz Step-Down Converter/LDO Regulator
2500.2006.05.1.16
21



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