AAT3190 データシートの表示（PDF） - Advanced Analogic Technologies

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AAT3190

Positive/Negative Charge Pump for Voltage Bias

Advanced Analogic Technologies 

AAT3190

Positive/Negative Charge Pump for Voltage Bias

IN

OSC

CTL

C7 1/2 A4

DRVN

BAT54SDW

FBN

AAT3190

GND

VREF

1.2V

R1

R2

C2

VON = -(R1/R2) x VREF

VON

C10

Figure 1: Negative Charge Pump Block Diagram.

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 + VIN), charge is transferred from C4

to C5 until the diode turns off.

IN

OSC

CTL

AAT3190

VREF

1.2V

GND

VIN

C4 1/2 A3

DRVP

BAT54SDW

FBP

R3

VOP

VOP = (1+R3/R4) x VREF

R4

C5

Figure 2: Positive Charge Pump Block Diagram.

3190.2006.01.1.2

9

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