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AAT3190ITP-T1 Datasheet(PDF) 8 Page - Advanced Analogic Technologies

Part # AAT3190ITP-T1
Description  Positive/Negative Charge Pump for Voltage Bias
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Manufacturer  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

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AAT3190
Positive/Negative Charge Pump for Voltage Bias
8
3190.2006.01.1.2
Functional Block Diagram
Control
UVLO
Band
Gap
Ref.
-
+
-
+
Reference
Oscillator
Over-
Temperature
Protection
DRVP
DRVN
FBP
REF
FBN
GND
IN
EN
Functional Description
Dual Charge Pump Regulators
The AAT3190 provides low-power regulated output
voltages from two individual charge pumps. Using
a single stage, the first charge pump inverts the
supply voltage (V
IN) and provides a regulated neg-
ative output voltage. The second charge pump dou-
bles V
IN and provides a regulated positive output
voltage. These outputs use external Schottky
diodes and capacitor multiplier stages (as many as
required) to regulate up to ±25V. A constant switch-
ing frequency of 1MHz minimizes the output ripple
and capacitor size.
Negative Charge Pump
During the first half-cycle, the P-channel MOSFET
turns on and the flying capacitor C7 charges to V
IN
minus a diode drop (Figure 1). During the second
half-cycle, the P-channel MOSFET turns off and
the N-channel MOSFET turns on, level shifting C7.
This connects C7 in parallel with the output reser-
voir capacitor C10.
If the voltage across C10
minus a diode drop is less than the voltage across
C7, current flows from C7 to C10 until the diode
turns off.


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