AAT2784 Analogic Corporation, AAT2784 Datasheet - Page 18

• Manufacturer Part Number: AAT2784
• Manufacturer: Analogic Corporation

Channel 3 Output Capacitor
C
I
Channels 1 and 2 Output Capacitors
C
I
Channel 3 Input Capacitor
Input Ripple V
C
I
P
Channels 1 and 2 Input Capacitors
Input Ripple V
C
I
P
P
P
18
18
SystemPower
SystemPower
RMS(MAX)
RMS(MAX)
RMS(MAX)
RMS(MAX)
OUT3
ESR
OUT1
ESR
ESR
ESR
IN3
IN1
=
= C
= ESR · I
= ESR · I
= ESR · I
= ESR · I
=
= C
⎛
⎝
V
=
=
=
=
V
IN2
3 · ΔI
I
DROOP
OUT2
O3
PP
2
2
I
I
2
2
O
=
O
·
·
1
1
- ESR · 4 · F
⎛
⎝
LOAD1
=
= 0.75A
= 0.3A
3
3
I
RMS
RMS
RMS
RMS
O1
· F
PP
PP
V
·
·
V
3 · ΔI
V
V
2
DROOP
2
+ I
= 33mV
2
= 15mV
2
S
1
PP
OUT
= 5mΩ · 92mA
OUT1
= 5mΩ · 24mA
⎞
⎠
= 5mΩ · (0.75A)
= 5mΩ · (0.3A)
TM
TM
=
O2
L · F
- ESR · 4 · F
LOAD1
L · F
0.2V · 1.8MHz
· (V
· F
· (V
S
3 · 1.5A
S
1
IN(MAX)
S
IN(MAX)
S
⎞
⎠
· V
=
· V
=
IN(MAX)
0.2V · 1.8MHz
IN(MAX)
⎛
⎝
- V
- V
33mV
2
3 · 0.3A
2
1.5A
S
2
OUT
= 0.042mW
= 3µW
OUT1
2
= 0.45mW
=
= 3mW
= 12.5µF; use 22µF
)
=
⎛
⎝
)
=
- 5mΩ · 4 · 1.8MHz
2
15mV
0.6A
·
2
1
·
1
3
= 2.5µF; use 4.7µF
1
3
·
⎞
⎠
1.5µH · 1.8MHz · 4.2V
·
- 5mΩ · 4 · 1.8MHz
w w w . a n a l o g i c t e c h . c o m
w w w . a n a l o g i c t e c h . c o m
1.2V · (4.2V - 1.2V)
4.7µH · 1.8MHz · 4.2V
3.3V · (4.2V - 3.3V)
1
⎞
⎠
= 9.3µF; use 10µF
3-Channel Step-Down DC/DC Converter
3-Channel Step-Down DC/DC Converter
= 6.9µF; use 10µF
= 92mA
= 24mA
PRODUCT DATASHEET
PRODUCT DATASHEET
AAT2784
AAT2784
2784.2007.11.1.1
2784.2007.11.1.1