Advanced Analog Technology, Inc.
April 2007
AAT1164/AAT1164B/AAT1164C
ILOAD
COUT
≥
2VripplefS
Example 6:
The output voltage ripple of VOUT3 and VOUT2 is under
1%, the minimum capacitance value can be calculated
as
30mA
COUT(VOUT3 ) ≥
≈ 0.1µF
η
2× 250mV ×1.19MHz
30mA
COUT(VOUT2) ≥
≈ 0.33µF
η
2× 60mV ×1.19MHz
η
: Efficiency, about 60% at charge pump circuit
Table 5. Recommended Components
DESIGNATION DESCRIPTION
6.8 µH, 1.8A,
L
MITSUMI C6-K1.8L 6R8
200mA 30V Schottky barrier
diode (SOT-23),
U1, U2, U3
DIODES BAT54S
2A 20V rectifier diode
DIODES DFLS220L
10 µF, 25V X5R ceramic
capacitor
D
C3
1 µF, 25V X5R ceramic
capacitor
C5, C6, C7
0.1 µF, 50V X5R ceramic
capacitor
C2, C4, C9, C10, C12
Operational Amplifier
The AAT1164 has five independent amplifiers. The
operational amplifiers are usually used to drive VCOM
and the gamma correction divider string for TFT-LCD.
The output resistors and capacitors of amplifiers are
used as low pass filters and compensators for unity gain
stable.
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