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參數(shù)資料
| 型號： | AAT3190ITP-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | Positive/Negative Charge Pump for Voltage Bias |
| 中文描述： | 正/負電荷泵電壓偏置 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 411K |
| 代理商： | AAT3190ITP-T1 |
AAT3190
Positive/Negative Charge Pump for Voltage Bias
3190.2005.03.1.0
9
Positive Charge Pump
During the first half-cycle, the N-channel MOSFET
turns on and charges the flying capacitor C4
(Figure 2). During the second half-cycle, the N-
channel MOSFET turns off and the P-channel
MOSFET turns on, level shifting C4 by the input
voltage. This connects C4 in parallel with the reser-
voir capacitor C5. If the voltage across C5 plus a
diode drop is less than the level shifted flying
capacitor (C4 + V
IN
), charge is transferred from C4
to C5 until the diode turns off.
Figure 1: Negative Charge Pump Block Diagram.
R1
R2
V
REF
1.2V
FBN
DRVN
GND
1/2 A4
BAT54SDW
C7
C10
OSC
CTL
AAT3190
IN
V
ON
V
ON
= -(R1/R2) x V
REF
C2
Figure 2: Positive Charge Pump Block Diagram.
R3
R4
V
REF
1.2V
FBP
DRVP
V
IN
GND
1/2 A3
BAT54SDW
C4
C5
OSC
CTL
AAT3190
IN
V
OP
V
OP
= (1+R3/R4) x V
REF
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