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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
Built in 1.6A, 0.23[ Switching NMOS Fault and Thermal Protection Internal Soft-Start Function Selectable FrequencyG 600 kHz or 1.25MHz Low Dissipation Current : Typical 1.6mA in Operation Four Channels VGAMMA with Output Current: +30mA (MAX) One channel VCOM with Output Current: +100mA (MAX) TSSOP-20 Package Available
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 .
20 GND1 19 18 17 16 GND IN1 EO N.C
Pin Configuration
(Top View)
SW
VDD
1 2 3 4 5 6 7 8 9 10
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.
SHDN FREQ
VDD1
CIN+ GI1 GI2 GI3 GI4
AAT1160
15 COUT 14 13 12 11 GO1 GO2 GO3 GO4
TSSOP-20 PACKAGE
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AAT1160
Pin Description PIN NO.
1 2
NAME I/O
SW
DESCRIPTION
Power Supply Shutdown Control Pin; High for Enable Frequency Select Pin High Voltage Power Supply VCOM Buffer Input Gamma Buffer 1 Input Gamma Buffer 2 Input Gamma Buffer 3 Input Gamma Buffer 4 Input
O High Voltage Switch Output
VDD SHDN FREQ VDD1 CIN+ GI1 GI2 GI3 GI4 GO4 GO3 GO2 GO1 COUT N.C EO IN1 GND GND1
I I I I I I I
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
O Gamma Buffer 4 Output O Gamma Buffer 3 Output O Gamma Buffer 2 Output O Gamma Buffer 1 Output O O PWM Error Amplifier Output Pin I Inverting Input Pin of PWM Error Amplifier Ground Ground VCOM Buffer Output
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AAT1160
Absolute Maximum Ratings
PARAMETER SYMBOL VALUE UNIT
VDD to GND SW to GND VDD1 to GND Input Voltage 1 (IN1, SHDN, FREQ) Input Voltage 2 (CIN+, CI1, CI2, GI3, GI4) Output Voltage 1 (EO) Output Voltage 2 (COUT, GO1, GO2, GO3, GO4, SW) Operating Free-Air Temperature Range Storage Temperature Range Power Dissipation
VDD VSW VDD1 VI1 VI2 VO1 VO2 TC TDD1 Pd
7 18 14 VDD +0.3 VDD1 +0.3 VDD +0.3 VDD1 +0.3
- 20 to + 85 - 45 to + 125
V V V V V V V

C C
700
mW
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AAT1160
Electrical Characteristics, VDD= 3V, FREQ=GND, VDD1= 10V Operating Power
SYMBOL VDD Input Supply Voltage Range
VDD Under Voltage Lockout
PARAMETER
TEST CONDITION
MIN
TYP
MAX UNIT
2.6 Falling Rising VIN1 =1.3V, not switching 2.29 2.43 2.58 0.36 1.2 0.1 160
5.5 2.57 0.60 5.0 10.0
V V V mA mA
A
VUVLO I VDD I SHDN TSHDN
Quiescent Current Shutdown Current Thermal Shutdown
VIN1 =1.1V, switching
VSHDN =GND
C
EA (Error Amplifier)
PARAMETER SYMBOL
Feedback Voltage Input Bias Current Feedback-Voltage Line Regulation Transconductance Voltage Gain Fault Detect Trigger Voltage
VIN1
I B1
VRI gm AV
TEST CONDITION Level to produce VEO=1.265V VIN1 =1.265V Level to produce VEO=1.265V 2.6V < V DD < 5.5V G I=5A
MIN
TYP
MAX UNIT
1.247 1.265 1.283 0 0.05 70 105 1,500 0.98 1.02 1.06 40 0.15 240
V
nA % /V A /V
V /V V
Oscillator
PARAMETER SYMBOL
Oscillation Frequency Maximum Duty Cycle
f OSC D MAX
TEST CONDITION FREQ=GND FREQ= VDD
MIN 500
TYP 600
MAX UNIT 700 kHz
900 79
1250 85 85
1500 92
kHz
% %
FREQ=GND FREQ= VDD
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AAT1160
Electrical Characteristics, VDD= 3V, FREQ=GND, VDD1= 10V N-CHANNEL SWITCH
PARAMETER SYMBOL TEST CONDITION MIN TYP MAX UNIT
Current Limit On-Resistance Leakage Current
I LIM R ON I SWOFF
VIN1 =1.1V,
I SW =1.2A VSW =12V
1.1
1.6 0.28 0.01
2.1 0.50 20.00
A
[
A
Soft Start & Fault Detect Time
PARAMETER
Soft Start Time During Fault Protect Trigger Time
SYMBOL t SS
TEST CONDITION
MIN
TYP
MAX UNIT
14 55
ms ms
t FS
Control Inputs Characteristics
PARAMETER SYMBOL TEST CONDITION MIN TYP MAX UNIT
Input Low Voltage Input High Voltage Hysteresis FREQ Pull Down Current SHDN Pull Up Current
VIL VIH VHYS I PL I PH 3.5 0.7 VDD 0.1 VDD 5.0 0.001
0.3 VDD
V V V
6.5 1.000
A A
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AAT1160
Electrical Characteristics, VDD= 3V, FREQ=GND, VDD1= 10V VCOM and Gamma Buffer Performance
PARAMETER SYMBOL TEST CONDITION MIN TYP MAX UNIT
Power Supply Rejection Ratio Supply Current
PSRR I VDD
VDD1 from 13.5V
6.5V
to
-
80 1.5
-
dB mA
VCOM and Gamma Buffer Input Characteristics
PARAMETER SYMBOL TEST CONDITION MIN TYP MAX UNIT
Input Offset Voltage Input Bias Current
VOS I B2
VCIN + or VGI1~ 4 =5V VCIN + or VGI1~ 4 =5V
-
2 2
12 50
mV nA
VCOM and Gamma Buffer AC Characteristics
PARAMETER SYMBOL TEST CONDITION MIN TYP MAX UNIT
Slew Rate [Note 1]
SR
VCIN + or VGI1~ 4 = 2V to 8V, 20% to 80% VCIN + or VGI1~ 4 = 4.5V to 5.5V 0.1% VCIN + or VGI1~ 4 = 5.5V to 4.5V 0.1%
-
12
-
V s
Settling Time
tS
-
5
-
s
Note 1: Slew rate is measured on rising and falling edges.
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AAT1160
Electrical Characteristics, VDD= 3V, FREQ=GND, VDD1= 10V VCOM and Gamma Buffer Output Characteristics
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Output Swing Low
VOL2
I COUT =5mA ( VCOM Buffer) VCIN + =0V I GO1~ 4 =10mA (Gamma Buffer) VGI1~ 4 =1V I COUT = - 5 mA ( VCOM Buffer) VCIN + =10V
9.85
0.08 1.02 9.92
0.15 V 1.05 V
Output Swing High
VOH2
I GO1~ 4 = - 10 mA (Gamma Buffer) VGI1~ 4 =9V I GO1~ 4 =10mA, VGI1~ 4 =5V I GO1~ 4 = - 10 mA, VGI1~ 4 =5V I COUT =50mA, VCIN + =5V I COUT = - 50 mA, VCIN + =5V (Gamma Buffer) ( VCOM Buffer)
8.95
8.98
-
Output Swing (Gamma Buffer)
VOL3 VOH3 VOL3 VOH3 I SHORT
4.96 4.95 -
5.02 4.98 5.03 4.97
70 180
5.04 V 5.05 V mA mA
Output Swing ( VCOM )
Short Circuit Current
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AAT1160
Efficiency vs. Load Current ( f OSC =1.2MHz VOUT =8.1V)
L:10H
Efficiency V.S. Load Current (VOUT:8.1V,Freqency:1.2MHz)
Efficiency vs. Load Current ( f OSC =600kHz VOUT =8.1V)
L:10H
Efficiency V.S. Load Current (VOUT:8.1V,Freqency:1.2MHz)
90 80
Efficiency (%) Efficiency (%)
90 80 70 60 50 40 1 5 10 20 30 40 50 60 70 80 90 100 120 150 180 200 300 400 500 1 5 10 20 30 40 50 60 70 80 90 100 120 150 180 200 300 400 500
Load Current (mA) Load Current (mA)
70 60 50 40
Efficiency vs. Load Current ( f OSC =1.2MHz VOUT =8.1V)
L:4.7H
Efficiency V.S. Load Current (VOUT:8.1V,Freqency:1.2MHz)
Efficiency vs. Load Current ( f OSC =600kHz VOUT =8.1V)
L:4.7H
Efficiency V.S. Load Current (VOUT :8.1V,Freqency:600KHz)
90
Efficiency(%)
Efficiency(%)
90 80 70 60 50 40
80 70 60 50 40 1 5 10 20 30 40 50 60 70 80 90 100 120 150 180 200 300 400 500 Load Current(mA)
1
5
10
20
30
40
50
60
70
80
90
100
120
150
180
200
300
400
500
Load Current(mA)
Load Regulation
Output Voltage V.S. Load Current Load Regulation 8.3 8.25 8.2 8.15 8.1 8.05 8 1 5 10 20 30 40 50 60 70 80 90 100 120 150 180 200 300 400 500 Load Current (mA)
Internal Soft Start
CH1: CH2: CH3:
VIN , 2V/div, DC
T = 2ms/div
I L , 500mA/div, DC
V
5V/div DC
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AAT1160
Load Transient Response Load Transient Response
CH2
CH1 T = 100s/div T = 100s/div
VO = 8.1V, VIN
CH2:
= 3.3V,
f OSC =1.2MHz
VO
CH2:
= 8.1V,
VIN
= 3.3V,
f OSC =600kHz
CH1: Load, 100mA to 250mA
CH1: Load, 100mA to 250mA
VO , 20
VO , 200mV/div, AC
VGAMMA Signal Response
INPUT No Cout 5v/div 100pF 1000pF 10nF 100nF 5v/div
VCOM Signal Response
INPUT No Cout 100pF 1000pF 10nF 100nF
10g s/div
10g s/div
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AAT1160
Operation Information:
Setting the Output Voltage: Output voltage is set by using a feedback pin and a The Compensation: Pin17 (EO) series with R C & C C for compensation, usually range as 1k[ R C 200k [ , 100pF C C 6,800pF. Standard formulas are
resistor divider; equation is as follows: VP1 =1.265 (1+R1/R2)
Soft-Start: The soft-start function is embedded with a typical
setting of 14ms
Operation Frequency Setting: Pin4 (FREQ) can set PWM operation to low with f OSC =600kHz, or set PWM operation to high with f OSC =1.2 MHz. Diode Selection: Schottky diode for the boost regulator must be
only for reference purpose, as PCB has a lot of noise or parasitic capacitance and resistance, it often requires on board adjustment. The key steps for step-up compensation are as follows: Transconductance (from FB to CC), g m (105S) Current-sense amplifier transresistance, R CS (0.275V/A) For continuous conduction, the right-half-plane zero frequency ( f RHPZ ) is given by the following: f RHPZ = VO (1-D)2/(2k *L* I LOAD ) where D=the duty cycle=1-( VIN / VO ), L is the inductance value, and I LOAD is the maximum output current. Typical target, crossover ( f C ), is 1/6 of the RHPZ. For example, if oscillation frequency is assumed to be f OSC =500kHz, VIN =2.5V, VO =5V, and I OUT =0.5A, then R LOAD =10[ . If we select L=4.7H, then: f RHPZ =5(2.5/5)2/(2k *4.7*10-6*0.5)=84.65kHz If f C =14kHz, CC would be calculated as: C C =( VFB / VO )( R LOAD / R CS )( g m /2* f C )(1-D)/2=( 1.25/5)(10/0.275)*[105S/(6.28*14kHz)](1/4)=2.7 nF Now selected R C has fulfilled transient-droop requirements. For example, if 4% of transient droop is allowed, input to error amplifier moves
selected correctly depending on the output voltage and the output current. The diode must have a reverse voltage equal to or greater than the output voltage. In addition, the diode current must exceed the switch current limit as a lower forward voltage will increase efficiency.
Inductor Selection: I L(peak) = I IN + VIN *D/(2*L* f S )
D: PWM duty VO / VIN =1/ (1-D) Maximum current of the inductor must be greater than I L(peak)
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AAT1160
0.04*1.25V, or 50mV. Error amplifier output drives 50mV*105s, or 6.25A, 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)/6.25A 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)]/6.25A=18.7k
BLOCK DIAGRAM
EO Error amplifier IN1 Bandgap & soft start Comparator
1.0v
SHDN Thermal SHDN Fault Detect
VDD SHDN SW
1.0v
1.24v
Control Logic
Driver
GND1 FREQ
oscillator
5u
Clock
Slope compensation current sense
VDD1 COUT Com GO1 GO2 GO3
CIN+
GND VDD1 Gamma1 GI1 GI2
Gamma2 Gamma3 Gamma4 GI3 GI4 GO4
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Advanced Analog Technology, Inc.
AAT1160
Application Circuit
VP1
R1
FREQ VDD IN1
SHDN
VP1
SW VDD1
R2
RC
EO
VP1
CC
CIN GI1 GI2 GI3 GI4
AAT1160
COUT GO1 GO2 GO3 GO4
GND1
GND
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Advanced Analog Technology, Inc.
AAT1160
Package Dimension
20-Pin TSSOP
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AAT1160
Package Dimension (Cont.)
20-Pin TSSOP
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