Details subject change without notice ONE-CHANNEL STEP-DOWN CONTR
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AAT1110
Details subject change without notice
ONE-CHANNEL STEP-DOWN CONTROLLER
Features
Under-Voltage Lockout (UVLO) Protection Totem Pole Output Output Short Circuit Protection Incorporates Soft-Start Function Wide Operating Frequency 1MHz Shutdown Control Dissipation Current Typical 1.6mA Operation SOP-8 TSSOP-8 Package Available
General Description
AAT1110 one-channel step-down controller incorporating soft-start function short circuit protection (SCP) function. Each device consists on-chip voltage reference, error amplifier, pulse width modulation controller, under-voltage protection, soft-start, short circuit protection circuits. Switching frequencies 1MHz external resistor capacitor. Soft-start time implemented capacitor. Additionally, chip enabled feature provided power down reduce supply current
Configuration
With optimized number external components, AAT1110 offers simple cost effective solution.
Advanced Analog Technology, Inc.
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AAT1110
Description
Name Description Chip Enable Input PinInternal Pull Soft-Start Capacitor Connection Power Supply Totem-Type Output Ground Capacitor Resistor Connection Setting Oscillation Frequency Error Amplifier Output Error Amplifier Inverting Input
Absolute Maximum Ratings
Characteristics
Supply Voltage Output Current Operating Free-Air Temperature Range Storage Temperature Range Power Dissipation
Symbol
Value
/+120 +125
Unit
Tstorage
Recommended Operating Conditions
Characteristics Supply Voltage, Symbol Unit
Error Amplifier Input Voltage Capacitor Resistor Oscillator Frequency Output Current Operating Free-Air Temperature
10,000 10.0 1,000 +30/
Advanced Analog Technology, Inc.
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AAT1110
Electrical Characteristics, 3.3V (Unless Otherwise Specified) (See Note
Oscillator Parameter Test Condition 270pF, Unit
Oscillation Frequency Frequency Variation With Temperature Frequency Input Stability
Under-Voltage Protection Parameter
2.6V 6.5V
Upper Threshold Voltage Lower Threshold Voltage Hysteresis VUPH VUPL
VUPH VUPL VHYS
Test Condition
Unit
2.12 2.47 1.96 2.28 0.19
2.85 2.63
Note1: Typical values parameters specified
Short Circuit Protection Control Parameter
Test Condition
Unit
Input Threshold Voltage Short-Circuit Detect Threshold Voltage Charging Current
Soft-Start Parameter
Vtscd VSCP
1.160 1.262 1.360 1.160 1.262 1.360
2.15
1.50 1.00
Charging Current Voltage Soft-Start Completion
Shutdown Control Parameter
Test Condition VSCP
2.15
Unit
1.50 1.00
1.160 1.262 1.360
Test Condition
Unit
Shutdown Enable Voltage Shutdown Release Voltage
Advanced Analog Technology, Inc.
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AAT1110
Electrical Characteristics, 3.3V (Unless Otherwise Specified) (See Note
(Error Amplifier) Parameter
Input Threshold Voltage
Test Condition 0.7V
Unit
1.249 1.262 1.275 0.05
Input Stability Variation with
Temperature Input Bias Current Output Voltage Swing Output Sink Current Output Source Current Open-Loop Voltage Gain
Output Section Parameter
6.5V
0.20
VOS+ VOS- =0.7V =0.7V
High-Level Output Voltage Low-Level Output Voltage Rise Time Fall Time
Operating Current Parameter
RISE FALL
Test Condition
Unit
IO=+30mA CL=1,000pF CL=1,000pF
Supply Current
DD-OFF DD-ON
Test Condition Output "OFF" State
Unit
=4.2
Advanced Analog Technology, Inc.
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AAT1110
Time Constant Soft-Start Short Circuit Protection
Soft-Start power AAT1110 operates soft-start mode. capacitor connected starts charging constant current. soft-start mode, voltage VSCP input comparator, that duty controlled VSCP completion soft-start operation, voltage stays low; input from soft-start circuit comparator stays high, enters short circuit protection waiting state. Soft-Start Time (sec) 0.84 (µF) Short Circuit Protection switching regulator output suddenly drops loading effect, error amplifier output will fixed capacitor will start charging. When voltage reaches approximately 1.26V, output will will remain low. Once protection circuit starts operating, circuit recovered setting power supply. Short Circuit Detection Time
(sec) 0.84 (µF)
Advanced Analog Technology, Inc.
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AAT1110
Block Diagram
IREF
ft-S tart
UVLO
rr-A
Advanced Analog Technology, Inc.
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AAT1110
Application Circuit Buck (Step-Down)
Cscp
Advanced Analog Technology, Inc.
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AAT1110
Buck (Step-Down) Timing Chart
Reference Input Short Circuit ldle Period Setting Voltage Soft-Start Setting Voltage
1.262V
Output
Soft-Start
Output Short Circuit
Output Short Circuit
2.47V Lockout Free
tscp
Advanced Analog Technology, Inc.
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AAT1110
Package Dimension
8-Pin
SYMBOLS
DIMENSIONS MILLIMETERS 1.47 0.10 -0.33 0.19 4.80 5.80 3.80 -0.38 1.60 -1.45 0.41 0.20 4.85 6.00 3.90 1.27 0.71 -MAX 1.73 0.22 -0.51 0.25 4.95 6.20 4.00 -1.27 0.076
DEMINSIONS INCHES 0.058 0.004 -0.013 0.0075 0.189 0.228 0.150 -0.015 0.063 -0.057 0.016 0.008 0.191 0.236 0.154 0.050 0.028 -MAX 0.068 0.008 -0.020 0.0098 0.195 0.244 0.157 -0.050
Advanced Analog Technology, Inc.
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AAT1110
Tape Reel
8-PinSOP
Advanced Analog Technology, Inc.
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AAT1110
Tape Reel
8-Pin (Cont.)
NOTE: SPROCKET HOLE PITCH CUMULATIVE TOLERANCE MILLIMETERS. CAMBER EXCEED MILLIMETER MILLIMETERS MATERIAL: ANTI-STATIC BLACK ADVANTEK POLYSTYRENE. MEASURED PLANE MILLIMETERS ABOVE BOTTOM POCKET.
MEASURED FROM PLANE INSIDE BOTTOM POCKET SURFACE
CARRIER. POCKET POSITION RELATIVE SPROCKET HOLE MEASURED TRUE POSITION POCKET, POCKET HOLE.
Advanced Analog Technology, Inc.
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AAT1110
Package Dimension
TSSOP-8
Advanced Analog Technology, Inc.
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AAT1110
Package Dimension
TSSOP-8
SYMBOL
DIMENSION MILLIMETERS 1.05 1.10 1.20 0.05 0.10 0.15 -1.00 1.05 0.25 -0.30 -0.127 -2.90 3.05 3.10 6.20 6.40 6.60 4.30 4.40 4.50 -0.65 -0.50 0.60 0.70 -0.076
DIMENSION INCHES 0.041 0.043 0.047 0.002 0.004 0.006 -0.039 0.041 0.010 -0.012 -0.005 -0.114 0.120 0.122 0.244 0.252 0.260 0.169 0.173 0.177 -0.026 -0.020 0.024 0.028 -0.003
NOTE: CONTROLLING DIMENSION: MILLIMETERS. LEAD FRAME MATERIAL: OLIN C7025/EFTEC 64T. DIMENSION DOES INCLUDE MOLD FLASH, BURRS GATE BURRS. MOLD FLASH, 0.006" [0.15 MILLIMETERS] END. DIMENSION "E1" DOES INCLUDE INTERLEAD FLASH. INTERLEAD MILLIMETERS] SIDE. DIMENSION DOES INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL 0.00 DIMENSION MAXIMUM MATERIAL CONDITION. DAMBAR CANNOT LOCATED LOWER RADIUS PROTRUSION ADJACENT LEAD 0.0028" [0.07 MILLIMETERS]. TOLERANCE: 0.010" [0.25 MILLIMETERES] UNLESS OTHERWISE SPECIFIED. OTHERWISE DIMENSION FOLLOW ACCEPTABLE SPEC. REFERENCE DOCUMENT: JEDEC SPEC MO-153.
Advanced Analog Technology, Inc.
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AAT1110
Tape Reel
TSSOP-8
Advanced Analog Technology, Inc.
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AAT1110
Tape Reel
TSSOP-8 (Cont.)
X.XXX 0.0025 0.006 X.XXX 0.025 X.XX 0.10 0.25 UNIT: MILLIMETERS
NOTE: SPROCKET HOLE PITCH CUMULATIVE TOLERANCE MILLIMETERS. CHAMBER EXCEED MILLIMETER MILLIMETERS. MATERIAL: ANTI-STATIC BLACK ADVANTEK POLYSTYRENE. MEASURED PLANE MILLIMETERS ABOVE BOTTOM POCKET. MEASURED FROM PLANE INSIDE BOTTOM POCKET SURFACE CARRIER. POCKET POSITION RELATIVE SPROCKET HOLE MEASURED TRUE POSITION POCKET, POCKET HOLE.
Advanced Analog Technology, Inc.
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AAT1110
Part Marking
SOP8 Marking
AAT1110 XXXXXX
SOP8 Back Marking
YYWW
Part Marking
TSSOP8 Marking
AAT1110 XXXXXX
TSSOP8 Back Marking
YYWW
Advanced Analog Technology, Inc.
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AAT1110
Ordering Information
Advanced Analog Technology, Inc.
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