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AIC1845CGBG Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers

Part # AIC1845CGBG
Description  Regulated 5V Charge Pump In SOT-23
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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AIC1845
11
]
D)
D(1
1
I
ESR)
(2R
V
[2V
C
)
D
-
1
I
ESR
-
D
I
ESR
-
D
1
I
2R
D
I
2R
V
(2V
C
)
I
ESR
-
I
ESR
-
I
2R
-
I
2R
-
V
-
(2V
C
)
V
(V
C
Q
-
Q
Q
OUT
ON
DS
OUT
IN
1
OUT
OUT
OUT
ON
DS
OUT
ON
DS
OUT
IN
1
AVE
-
OFF
AVE
ON
AVE
-
OFF
ON
-
DS
AVE
-
ON
ON
-
DS
OUT
IN
1
AVE
OFF
C1
AVE
ON
C1
1
OFF
ON
×
×
+
×
=
×
×
×
×
×
=
×
×
×
×
×
=
×
=
=
………(13)
Thus the output current can be written as
]
D)
-
D(1
1
I
)
ESR
(2R
-
V
[2V
C
f
)
Q
(Q
f
Q
f
I
OUT
ON
-
DS
OUT
IN
1
OFF
ON
OUT
×
×
+
×
×
=
×
=
×
=
(14)
When the duty cycle is 0.5, the output current can be written as:
]
I
4ESR)
(8R
V
[2V
fC
]
0.5)
0.5(1
1
I
ESR)
(2R
V
[2V
C
f
I
OUT
ON
DS
OUT
IN
1
OUT
ON
DS
OUT
IN
1
OUT
×
+
×
=
×
×
+
×
×
=
(15)
And equation (15) can be re-written as:
OUT
ON
DS
OUT
1
OUT
IN
I
4ESR)
(8R
I
fC
1
V
2V
×
+
+
×
=
(16)
VOUT
2VIN
COUT
1/fC1
8RDS-ON
IOUT
LOAD
4ESR
Fig. 22 The euqivalent circuit of charge pump
According the equation (16), when the duty cycle
is 0.5, the equivalent circuit of charge pump is
shown in Fig. 22. The term 8RDS-ON is the total
effect of switching resistance, 1/fC1 is the effect
of flying capacitor and 4ESR is its equivalent
resistance.
From the equivalent circuit shown in Fig. 22, it is
seen that the terms 1/fC1, 4ESR and 8RDS-ON
should be as small as possible to get large output
current. However, for users, since the RDS-ON is
fixed and manufactured in IC, what we can do is
to lower 1/fC1 and ESR. However even the effect
of 1/fC1 and ESR can be kept as small as
possible, the term 8RDS-ON still dominates the
role that limits the maximum output current.
Layout Considerations
Due to the switching frequency and high transient
current of AIC1845, careful consideration of PCB
layout is necessary. To achieve the best
performance of AIC1845, minimize the distance
between every two components and also
minimize
every
connection
length
with
a
maximum trace width. Make sure each device
connects to immediate ground plane. Fig. 23 to
Fig. 25 show the recommended layout.


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