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AAT1160
Product information presented current publication date. Details subject change without notice.
Step Current Mode Converter with Operational Amplifiers
Features
Built 1.6A, 0.23 Switching NMOS Fault Thermal Protection Internal Soft-Start Function Selectable Frequency600 1.25MHz Dissipation Current Typical 1.6mA Operation Four Channels VGAMMA with Output Current: +30mA (MAX) channel VCOM with Output Current: +100mA (MAX) TSSOP-20 Package Available
General Description
AAT1160 step current mode converter that provides one-channel step-up controller, four Gamma buffers, VCOM buffer. Internal soft-start function efficiently prevent inrush current when power This controller consists on-chip voltage reference, error amplifier, current sense, pulse width modulation controller, under-voltage lockout protection, thermal detect, soft-start, fault protection circuits. AAT1160 contains operational amplifiers: GO1, GO2, GO3, gamma corrections COUT VCOM
GND1
Configuration
(Top View)
VCOM VGAMMA
designed increase
driving capability thin film transistor liquid crystal display (TFT LCD). Each buffer capable driving heavy load offering fast current loading VCOM 100mA VGAMMA 30mA With minimal external components, AAT1160 offers simple economical power management solution panels.
SHDN FREQ
VDD1
CIN+
AAT1160
COUT
TSSOP-20 PACKAGE
Advanced Analog Technology, Inc.
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AAT1160
Description
NAME
DESCRIPTION
Power Supply Shutdown Control Pin; High Enable Frequency Select High Voltage Power Supply VCOM Buffer Input Gamma Buffer Input Gamma Buffer Input Gamma Buffer Input Gamma Buffer Input
High Voltage Switch Output
SHDN FREQ VDD1 CIN+ COUT GND1
Gamma Buffer Output Gamma Buffer Output Gamma Buffer Output Gamma Buffer Output Error Amplifier Output Inverting Input Error Amplifier Ground Ground VCOM Buffer Output
Advanced Analog Technology, Inc.
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AAT1160
Absolute Maximum Ratings
PARAMETER SYMBOL VALUE UNIT
VDD1 Input Voltage (IN1, SHDN, FREQ) Input Voltage (CIN+, CI1, CI2, GI3, GI4) Output Voltage (EO) Output Voltage (COUT, GO1, GO2, GO3, GO4, Operating Free-Air Temperature Range Storage Temperature Range Power Dissipation
VDD1 TDD1
+0.3 VDD1 +0.3 +0.3 VDD1 +0.3
Advanced Analog Technology, Inc.
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AAT1160
Electrical Characteristics, VDD= FREQ=GND, VDD1= Operating Power
SYMBOL Input Supply Voltage Range
Under Voltage Lockout
PARAMETER
TEST CONDITION
UNIT
Falling Rising VIN1 =1.3V, switching 2.29 2.43 2.58 0.36
2.57 0.60 10.0
VUVLO SHDN TSHDN
Quiescent Current Shutdown Current Thermal Shutdown
VIN1 =1.1V, switching
VSHDN =GND
(Error Amplifier)
PARAMETER SYMBOL
Feedback Voltage Input Bias Current Feedback-Voltage Line Regulation Transconductance Voltage Gain Fault Detect Trigger Voltage
VIN1
TEST CONDITION Level produce VEO=1.265V VIN1 =1.265V Level produce VEO=1.265V 2.6V 5.5V I=5µA
UNIT
1.247 1.265 1.283 0.05 1,500 0.98 1.02 1.06 0.15
Oscillator
PARAMETER SYMBOL
Oscillation Frequency Maximum Duty Cycle
TEST CONDITION FREQ=GND FREQ=
UNIT
1250
1500
FREQ=GND FREQ=
Advanced Analog Technology, Inc.
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AAT1160
Electrical Characteristics, VDD= FREQ=GND, VDD1= N-CHANNEL SWITCH
PARAMETER SYMBOL TEST CONDITION UNIT
Current Limit On-Resistance Leakage Current
SWOFF
VIN1 =1.1V,
=1.2A =12V
0.28 0.01
0.50 20.00
Soft Start Fault Detect Time
PARAMETER
Soft Start Time During Fault Protect Trigger Time
SYMBOL
TEST CONDITION
UNIT
Control Inputs Characteristics
PARAMETER SYMBOL TEST CONDITION UNIT
Input Voltage Input High Voltage Hysteresis FREQ Pull Down Current SHDN Pull Current
VHYS 0.001
1.000
Advanced Analog Technology, Inc.
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AAT1160
Electrical Characteristics, VDD= FREQ=GND, VDD1= VCOM Gamma Buffer Performance
PARAMETER SYMBOL TEST CONDITION UNIT
Power Supply Rejection Ratio Supply Current
PSRR
VDD1 from 13.5V
6.5V
VCOM Gamma Buffer Input Characteristics
PARAMETER SYMBOL TEST CONDITION UNIT
Input Offset Voltage Input Bias Current
VCIN VGI1~ VCIN VGI1~
VCOM Gamma Buffer Characteristics
PARAMETER SYMBOL TEST CONDITION UNIT
Slew Rate [Note
VCIN VGI1~ VCIN VGI1~ 4.5V 5.5V 0.1% VCIN VGI1~ 5.5V 4.5V 0.1%
Settling Time
Note Slew rate measured rising falling edges.
Advanced Analog Technology, Inc.
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AAT1160
Electrical Characteristics, VDD= FREQ=GND, VDD1= VCOM Gamma Buffer Output Characteristics
PARAMETER SYMBOL TEST CONDITIONS UNIT
Output Swing
VOL2
COUT =5mA VCOM Buffer) VCIN GO1~ =10mA (Gamma Buffer) VGI1~ COUT VCOM Buffer) VCIN =10V
9.85
0.08 1.02 9.92
0.15 1.05
Output Swing High
VOH2
GO1~ (Gamma Buffer) VGI1~ GO1~ =10mA, VGI1~ GO1~ VGI1~ COUT =50mA, VCIN COUT VCIN (Gamma Buffer) VCOM Buffer)
8.95
8.98
Output Swing (Gamma Buffer)
VOL3 VOH3 VOL3 VOH3 SHORT
4.96 4.95
5.02 4.98 5.03 4.97
5.04 5.05
Output Swing VCOM
Short Circuit Current
Advanced Analog Technology, Inc.
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AAT1160
Efficiency Load Current =1.2MHz VOUT =8.1V)
L:10µH
Efficiency V.S. Load Current (VOUT :8.1V,Freqency:1.2MHz)
Efficiency Load Current =600kHz VOUT =8.1V)
L:10µH
Efficiency V.S. Load Current (VOUT :8.1V,Freqency:1.2MHz)
Efficiency Efficiency
Load Current (mA) Load Current (mA)
Efficiency Load Current =1.2MHz VOUT =8.1V)
L:4.7µH
Efficiency V.S. Load Current (VOUT :8.1V,Freqency:1.2MHz)
Efficiency Load Current =600kHz VOUT =8.1V)
L:4.7µH
Efficiency V.S. Load Current (VOUT :8.1V,Freqency:600KHz)
Efficiency(%)
Efficiency(%)
Load Current(mA)
Load Current(mA)
Load Regulation
Output Voltage V.S. Load Current Load Regulation 8.25 8.15 8.05 Load Current (mA)
Internal Soft Start
CH1: CH2: CH3:
2V/div,
2ms/div
500mA/div,
5V/div
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AAT1160
Load Transient Response Load Transient Response
100µs/div 100µs/div
8.1V,
CH2:
3.3V,
=1.2MHz
CH2:
8.1V,
3.3V,
=600kHz
CH1: Load, 100mA 250mA
CH1: Load, 100mA 250mA
200mV/div,
VGAMMA Signal Response
INPUT Cout 5v/div 100pF 1000pF 10nF 100nF 5v/div
VCOM Signal Response
INPUT Cout 100pF 1000pF 10nF 100nF
10s/div
10s/div
Advanced Analog Technology, Inc.
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AAT1160
Operation Information:
Setting Output Voltage: Output voltage using feedback Compensation: Pin17 (EO) series with compensation, usually range 200k 100pF 6,800pF. Standard formulas
resistor divider; equation follows: =1.265 (1+R1/R2)
Soft-Start: soft-start function embedded with typical
setting 14ms
Operation Frequency Setting: Pin4 (FREQ) operation with =600kHz, operation high with =1.2 MHz. Diode Selection: Schottky diode boost regulator must
only reference purpose, noise parasitic capacitance resistance, often requires board adjustment. steps step-up compensation follows: Transconductance (from CC), (105µS) Current-sense amplifier transresistance, (0.275V/A) continuous conduction, right-half-plane zero frequency RHPZ given following: RHPZ (1-D)2/(2*L* LOAD where D=the duty cycle=1-( inductance value, LOAD maximum output current. Typical target, crossover RHPZ. example, oscillation frequency assumed =500kHz, =2.5V, =5V, =0.5A, then LOAD =10. select L=4.7µH, then: RHPZ =14kHz, would calculated LOAD )(1-D)/2=( selected fulfilled transient-droop requirements. example, transient droop allowed, input error amplifier moves
selected correctly depending output voltage output current. diode must have reverse voltage equal greater than output voltage. addition, diode current must exceed switch current limit lower forward voltage will increase efficiency.
Inductor Selection: L(peak) *D/(2*L*
duty (1-D) Maximum current inductor must greater than L(peak)
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AAT1160
0.04*1.25V, 50mV. Error amplifier output drives 50mV*105µs, 6.25µA, across provide transient gain. Since current-sense transresistance 0.275V/A, value that would allow required load-step swing follows: =0.275IIND(PK)/6.25µA step-up DC-to-DC converter, LIDEAL used, output current would relate inductor current Therefore, 500mA output load step with =2.5V =5V:
BLOCK DIAGRAM
Error amplifier Bandgap soft start Comparator
1.0v
SHDN Thermal SHDN Fault Detect
SHDN
1.0v
1.24v
Control Logic
Driver
GND1 FREQ
oscillator
Clock
Slope compensation current sense
VDD1 COUT
CIN+
VDD1 Gamma1
Gamma2 Gamma3 Gamma4
Advanced Analog Technology, Inc.
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AAT1160
Application Circuit
FREQ
SHDN
VDD1
AAT1160
COUT
GND1
Advanced Analog Technology, Inc.
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AAT1160
Package Dimension
20-Pin TSSOP
Advanced Analog Technology, Inc.
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AAT1160
Package Dimension (Cont.)
20-Pin TSSOP
Advanced Analog Technology, Inc.
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