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PDF AAT1160 Data sheet ( Hoja de datos )
| Número de pieza | AAT1160 | |
| Descripción | Step Up Current Mode PWM Converter | |
| Fabricantes | AAT | |
| Logotipo |  |
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Advanced Analog Technology, Inc.
AAT1160
Product information presented is current as of publication date. Details are subject to change without notice.
Step Up Current Mode PWM Converter with
4+1 Operational Amplifiers
Features
z Built in 1.6A, 0.23 Switching NMOS
z Fault and Thermal Protection
z Internal Soft-Start Function
z Selectable Frequency 600 kHz or 1.25MHz
z Low Dissipation Current :
Typical 1.6mA in Operation
z Four Channels VGAMMA with Output Current:
+30mA (MAX)
z One channel VCOM with Output Current:
+100mA (MAX)
z TSSOP-20 Package Available
Pin Configuration
(Top View)
SW 1
20 GND1
VDD
SHDN
2
3
19 GND
18 IN1
FREQ 4
17 EO
VDD1
CIN+
5 16 N.C
6 AAT1160 15 COUT
GI1 7
14 GO1
GI2 8
13 GO2
General Description
The AAT1160 is a step up current mode PWM
converter that provides a one-channel step-up PWM
controller, four Gamma buffers, and one VCOM
buffer. Internal soft-start function can efficiently
prevent inrush current when the power is on.
This PWM controller 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 circuits.
The AAT1160 contains 4+1 operational amplifiers:
GO1, GO2, GO3, and GO4 for gamma corrections
and COUT for VCOM .
VCOM and VGAMMA are designed to increase
driving capability for thin film transistor liquid
crystal display (TFT LCD). Each buffer is capable
of driving heavy load and offering fast current
loading ( VCOM : ± 100mA , and VGAMMA : ± 30mA ).
With minimal external components, the AAT1160
offers a simple and economical power management
solution for TFT LCD panels.
GI3 9
12 GO3
GI4 10
11 GO4
TSSOP-20 PACKAGE
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– Advanced Analog Technology, Inc. –
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Advanced Analog Technology, Inc.
Electrical Characteristics, VDD= 3V, FREQ=GND, VDD1= 10V
AAT1160
N-CHANNEL SWITCH
PARAMETER
Current Limit
On-Resistance
Leakage Current
SYMBOL TEST CONDITION
I LIM
R ON
I SWOFF
VIN1=1.1V,
ISW =1.2A
VSW =12V
MIN
1.1
TYP MAX UNIT
1.6 2.1 A
0.28 0.50
0.01 20.00 µA
Soft Start & Fault Detect Time
PARAMETER
Soft Start Time
SYMBOL
t SS
During Fault Protect Trigger
Time
t FS
TEST CONDITION
MIN TYP MAX UNIT
14 ms
55 ms
Control Inputs Characteristics
PARAMETER
SYMBOL
Input Low Voltage
VIL
Input High Voltage
VIH
Hysteresis
VHYS
FREQ Pull Down Current
SHDN Pull Up Current
I PL
I PH
TEST CONDITION
MIN
0.7
VDD
3.5
TYP
0.1
VDD
5.0
MAX UNIT
0.3
VDD
V
V
V
6.5 µA
0.001 1.000 µA
––
– Advanced Analog Technology, Inc. –
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Advanced Analog Technology, Inc.
0.04*1.25V, or 50mV. Error amplifier output
drives 50mV*105µs, or 6.25µA, across R C to
provide transient gain. Since the current-sense
transresistance is 0.275V/A, the value of R C that
would allow the required load-step swing is as
follows:
R C =0.275IIND(PK)/6.25µA
AAT1160
In a step-up DC-to-DC converter, if LIDEAL is used,
output current would relate to inductor current as:
IIND(PK)=1.25IOUT/(1-D)=1.25IOUT* VO / VIN
Therefore, for a 500mA output load step with
VIN =2.5V and VO =5V:
R C =[1.25(0.75*0.5*5)/2)]/6.25µA=18.7kΩ
BLOCK DIAGRAM
EO
Error amplifier
IN1
Bandgap &
1.0v soft start
1.24v
1.0v
Comparator
SHDN
Thermal SHDN
Fault Detect
Control
Logic
Driver
FREQ
CIN+
oscillator
5u
Clock Slope compensation ∑ current sense
Com
GND
GI1
VDD1
Gamma1
GI2
Gamma2
GI3
Gamma3
GI4
Gamma4
VDD
SHDN
SW
GND1
VDD1
COUT
GO1
GO2
GO3
GO4
––
– Advanced Analog Technology, Inc. –
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AAT1160.PDF ] | |
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