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參數(shù)資料
| 型號(hào)： | AAT3111IJS-3.6-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | MicroPower⑩ Regulated Charge Pump |
| 中文描述： | 微功耗穩(wěn)壓電荷泵⑩ |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 342K |
| 代理商： | AAT3111IJS-3.6-T1 |
AAT3111
MicroPower Regulated Charge Pump
12
3111.2006.06.1.3
There are several methods that can be employed to
reduce output ripple depending upon the require-
ments of a given application. The most simple and
straightforward technique is to increase the value of
the C
OUT
capacitor. The nominal 10μF C
OUT
capac-
itor can be increased to 22μF or more. Larger val-
ues for the C
OUT
capacitor (22μF and greater) will by
nature have lower ESR and can improve both high
and low frequency components of the charge pump
output ripple response. If a higher value tantalum
capacitor is used for C
OUT
to reduce low frequency
ripple elements, a small 1μF low ESR ceramic
capacitor should be added in parallel to the tantalum
capacitor (see Figure 1). The reason for this is tan-
talum capacitors typically have higher ESR than
equivalent value ceramic capacitors and are less
able to reduce high-frequency components of the
output ripple. The only disadvantage to using large
values for the C
OUT
capacitor is the AAT3111 device
turn-on time and inrush current may be increased.
If additional ripple reduction is desired, an R/C filter
can be added to the charge pump output in addi-
tion to the C
OUT
capacitor (see Figure 2). An R/C
filter will reduce output ripple by primarily attenuat-
ing high frequency components of the output ripple
waveform. The low frequency break point for the
R/C filter will significantly depend on the capacitor
value selected.
Layout Considerations
High charge pump switching frequencies and large
peak transient currents mandate careful printed cir-
cuit board layout. As a general rule for charge
pump boost converters, all external capacitors
should be located as closely as possible to the
device package with minimum length trace con-
nections. Maximize the ground plane around the
AAT3111 charge pump and make sure all external
capacitors are connected to the immediate ground
plane. A local component side ground plane is rec-
ommended. If this is not possible due the layout
design limitations, assure good ground connec-
tions by the use of large or multiple PCB vias.
Refer to the AAT3111 evaluation board for an exam-
ple of good charge pump layout design (Figures 3
through 5).
Figure 1: Application Using Tantalum Capacitor.
Figure 2: Application With Output Ripple Reduction Filter.
1
μ
F
10
μ
F
C
OUT
10
μ
F
C
FLY
C
IN
V
OUT
(3.3V)
V
IN
(1.8V to 3.3V)
C+
VOUT
AAT3111
GND
SHDN
VIN
C-
ON/OFF
C
FILTER
33
μ
F
R
FILTER
1.5
C
FLY
1
μ
F
C
IN
10
μ
F
C
OUT1
22
F
V
OUT
(3.3V)
V
IN
(1.8V to 3.3V)
C+
VOUT
AAT3111
GND
SHDN
VIN
C-
ON/OFF
C
OUT2
1
μ
F
+
+
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參數(shù)描述 |
|---|---|
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