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參數(shù)資料
| 型號： | AAT3110IJS-4.5-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)： | 15/20頁 |
| 文件大?。?/td> | 290K |
| 代理商： | AAT3110IJS-4.5-T1 |
AAT3110
MicroPower Regulated Charge Pump
3110.2005.11.1.4
15
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 AAT3110 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
AAT3110 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 to layout
design limitations, assure good ground connec-
tions by the use of large or multiple PCB vias.
Refer to the AAT3110 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
F
C
FLY
C
IN
V
OUT
(5V)
V
IN
(2.7V to 5V)
C+
VOUT
AAT3110-5
GND
SHDN
VIN
C-
ON/OFF
C
FILTER
33
μ
F
R
1.5
C
FLY
1
μ
F
C
IN
10
μ
F
C
OUT1
22
F
V
OUT
(5V)
V
IN
(2.7V to 5V)
C+
VOUT
AAT3110-5
GND
SHDN
VIN
C-
ON/OFF
C
OUT2
1
+
+
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3110IJS-5.0-T1 | 制造商:Advanced Analogic Tech 功能描述:AAT3110 Series 750kHz 100mA Step up MicroPower Regulated Charge Pump-SC-70JW-8 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3110IJS-5-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:MicroPower⑩ Regulated Charge Pump |
| AAT3111 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:MicroPower⑩ Regulated Charge Pump |
| AAT3111-33 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:MicroPower⑩ Regulated Charge Pump |
| AAT3111-36 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:MicroPower⑩ Regulated Charge Pump |
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