AAT1118A AAT [Advanced Analog Technology, Inc.], AAT1118A Datasheet

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AAT1118A

Manufacturer Part Number
AAT1118A
Description
ADJUSTABLE TRIPLE-CHANNEL TFT LCD DC-DC CONVERTER
Manufacturer
AAT [Advanced Analog Technology, Inc.]
Datasheet
PGO
PGO
GND
GND
V
V
V
V
IN1
IN1
EO
EO
IN3
IN3
IN2
IN2
DD
DD
REF
REF
Details are subject to change without notice.
Features
Pin Configuration
Built in 1.6A, 0.2 Switching NMOS
Fault and Thermal Protection
Internal Soft-Start Function
Internal Power Up Sequencing
Dual Adjustable Charge Pump Output
Positive Output to 40V
Negative Output to
Power Good Output
TSSOP-16 Package
(TSSOP-16 Package)
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
(Top View)
AAT1118/A/B
AAT1118/A/B
16
16
15
15
14
14
13
13
12
12
11
11
10
10
9
9
40V
GND1
GND1
SW
SW
GND2
GND2
OUT3
OUT3
OUT2
OUT2
SHDN
SHDN
V
V
V
V
DD1
DD1
DD2
DD2
ADJUSTABLE TRIPLE-CHANNEL TFT LCD
˚ ” ~ H ] ¶ ß
/
/
V
V
CH3
CH3
Page 1 of 18
General Description
The AAT1118/A/B is an adjustable triple-channel
TFT LCD DC-DC converter that provides one
current mode PWM, one positive charge pump and
one negative charge pump. Built-in functions
include soft-start and power up sequencing. When
power is turned on, soft-start avoids inrush current.
Power
compensation for LCD panel to maintain a smooth
voltage during a turn-on cycle.
The DC-DC converter consists of an on-chip
voltage reference, error amplifier, current sense,
pulse width modulation controller, under-voltage
lockout protection, thermal detect, soft-start, and
fault protection circuit.
When the two charge pumps are in operation, the
output voltage would be doubled and the generated
VP3 and VP2 (Note 1) could switch on or off TFT
gate.
With the minimal external components, the
AAT1118/A/B offers a simple and economical
solution for TFT LCD power.
Note 1: Please refer to page 13 and 14 for VP3 and
VP2.
ø
up
sequencing
DC-DC CONVERTER
AAT1118/A/B
feature
V 1.0
provides

Related parts for AAT1118A

AAT1118A Summary of contents

Page 1

Details are subject to change without notice. Features Built in 1.6A, 0.2 Switching NMOS Fault and Thermal Protection Internal Soft-Start Function Internal Power Up Sequencing Dual Adjustable Charge Pump Output Positive Output to 40V − Negative Output to 40V Power ...

Page 2

Pin Description PIN NO. NAME I/O 1 PGO O HV Switch Output 2 IN1 I Inverting Input Pin of PWM Error Amplifier Output Pin of PWM Error Amplifier Power Supply DD 5 GND - ...

Page 3

Absolute Maximum Ratings PARAMETER V to GND GND GND DD1 DD2 Input Voltage 1 (IN1, IN2, IN3, SHDN) Output Voltage 1 (EO, V REF Output Voltage 2 (OUT2, OUT3, SW, PGO) Operating Free-Air ...

Page 4

Electrical Characteristics, V Operating Power PARAMETER Input Supply Voltage Range VDD Under Voltage Lockout Regulated Output Voltage Range Quiescent Current Shutdown Current Thermal Shutdown Reference Voltage PARAMETER Reference Voltage Line Regulation Load Regulation EA (Error Amplifier) PARAMETER Feedback Voltage Input ...

Page 5

Electrical Characteristics, V Oscillator PARAMETER Oscillation Frequency Maximum Duty Cycle N-Channel Switch PARAMETER Current Limit On-Resistance Leakage Current Control Inputs Characteristics PARAMETER Input Low Voltage Input High Voltage Hysteresis SHDN Pull Up Current – – = 3.3V 10V ...

Page 6

... Time IN1 Fault Protection Voltage IN2 Fault Protection Voltage IN3 Fault Protection Voltage – – = 3.3V 10V DD DDH SYMBOL TEST CONDITION t SS1 t SS2 t SS3 t AAT1118A D12 t AAT1118B D23 t ‡ ‡ ‡ ˚ ” ¶ ß ø Page AAT1118/A/B ...

Page 7

Electrical Characteristics, V Charge Pump Regulator Characteristics PARAMETER V Input Supply DD1 Range V Input Supply DD2 Range IN2 Threshold Voltage IN3 Threshold Voltage IN2 Input Bias Current IN3 Input Bias Current Charge Pump Frequency OUT2 Switch R-on OUT3 Switch ...

Page 8

BLOCK DIAGRAM AAT1118 IN1 IN1 Bandgap & Bandgap & 1.24v 1.24v REF REF Soft Start Soft Start PGO PGO Clock Clock Oscillator Oscillator OSC OSC V V DD2 DD2 OSC OSC OUT3 OUT3 GND2 GND2 1.24v ...

Page 9

BLOCK DIAGRAM AAT1118B EO EO IN1 IN1 Bandgap & Bandgap & 1.24v 1.24v REF REF Soft Start Soft Start PGO PGO Clock Clock Oscillator Oscillator OSC OSC V V DD2 DD2 OSC OSC OUT3 OUT3 GND2 GND2 1.24v ...

Page 10

Typical Operating Characteristics (VIN = 3.3V, = +25°C, unless otherwise noted 10.04 10.02 10 9.98 9.96 9.94 9.92 9.9 9.88 9.86 9.84 0 100 200 300 400 500 600 700 800 100 ...

Page 11

Typical Operating Characteristics (Continued) (VIN = 3.3V, = +25°C, unless otherwise noted 18.05 18 17.95 17.9 17.85 17.8 17.75 17 1.2 1.15 1.1 1.05 1 0.95 0.9 0.85 2.5 3 3.5 ...

Page 12

Typical Operating Characteristics (Continued) (VIN = 3.3V, = +25°C, unless otherwise noted – – ˚ ” ¶ ß ø Page AAT1118/A/B – – V 1.0 ...

Page 13

Application Circuit AAT1118/A VP1 SHDN VP2 VP3 – – IN1 EO SW AAT1118/A SHDN OUT2 PGO V DD1 V DD2 IN2 OUT3 V REF IN3 GND1 GND GND2 ˚ ” ¶ ß ø Page 13 ...

Page 14

Application Circuit AAT1118B VP1 SHDN VP2 VP3 ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! – – IN1 EO SW AAT1118B SHDN ...

Page 15

Timing Chart AAT1118 SHDN SHDN 90% 90 14ms Max. Max. 3.5ms PGO PGO – – 3.5ms ˚ ” ¶ ...

Page 16

... Timing Chart AAT1118A SHDN SHDN 14ms Max Max PGO PGO – – 7ms 3.5ms 3.5ms ˚ ” ¶ ß ø Page AAT1118/A 25V 25V – – V 1.0 ...

Page 17

Timing Chart AAT1118B ! ! ! ! ! ! ! ! ! ! ! ! SHDN SHDN ! ! ! ! 90% 90 ...

Page 18

Package Dimension 16-Pin TSSOP ! ! ! ! ! ! ! ! ! ! ! ! ł – – ‡ ‡ ‡ ł ł ł ˚ ” ¶ ß ø Page AAT1118/A ...

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