AAT1164 Datasheet, PDF (21/24 Pages) Advanced Analog Technology, Inc. – TRIPLE-CHANNEL TFT LCD POWER SOLUTION

Advanced Analog Technology, Inc.
April 2007
AAT1164/AAT1164B/AAT1164C
C_OUT
≥
I_LOAD
2V_ripple f_S
Example 6:
The output voltage ripple of V_OUT3 and V_OUT2 is under
1%, the minimum capacitance value can be calculated
as
C_OUT (V_OUT3 )
≥
30mA
η2 × 250mV ×1.19MHz
≈ 0.1µF
C_OUT (V_OUT2 )
≥
30mA
η2 × 60mV ×1.19MHz
≈ 0.33µF
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
U1, U2, U3
diode (SOT-23),
DIODES BAT54S
2A 20V rectifier diode
D
DIODES DFLS220L
10 µF, 25V X5R ceramic
C3
capacitor
C5, C6, C7
1 µF, 25V X5R ceramic
capacitor
0.1 µF, 50V X5R ceramic
C2, C4, C9, C10, C12
capacitor
Operational Amplifier
The AAT1164 has five independent amplifiers. The
operational amplifiers are usually used to drive V_COM
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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