Details subject change without notice 250-mA MULTI-INPUT LOW-DROP

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Details subject change without notice 250-mA MULTI-INPUT LOW-DROP

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AAT1203
Details subject change without notice
250-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH VAUX SWITCH
Features Complete Power Management Automatic Input Voltage Selection Input Voltage Source Detector With Hysteresis 250-mA Load Current Capability With VCC50 VSB50 AUX33 Input Source Integrated rDS(on Switch Regulated Output 3.3V (fixed) Output Short Circuit Protection Configuration
VIEW
VSB50 VCC50 OUT33 AUX33
8-PIN
Description AAT1203 multi-input low-dropout regulator designed cards. provides constant output supply 3.3V output capable driving 250-mA load. AAT1203 equipped with regulated power output systems that have multiple input sources require constant voltage source with low-dropout voltage. This intelligent power source selection device with low-dropout regulator either VCC50 VSB50 inputs, low-resistance bypass switch AUX33 input. AAT1203 allows transitions progress smoothly from input supply another without generating glitch outside specified range 3.3-V output. device incorporated reverse-blocking scheme prevent excess leakage from input terminals event that output voltage greater than input voltage. input voltage prioritized following order: VCC50, VSB50, AUX33.
Advanced Analog Technology, Inc.
Page
AAT1203
Function Table
INPUT VOLTAGE STATUS VCC50 VSB50 AUX33 INPUT SELECTED VCC50/VSB50/AUX33 None AUX33 VSB50 VSB50 VCC50 VCC50 VCC50 VCC50 OUTPUT OUT33 OUTPUT Iout33
Description
TERMINAL NAME VSB50 VCC50 OUT33 AUX33 TERMINAL Standby Supply Input Main Supply Input 3.3V Regulated Output 3.3V Auxiliary Supply Input Ground Ground Ground Ground DESCRIPTION
Absolute Maximum Ratings
Main Supply Voltage, V(VCC50 V~7V Standby Supply Voltage, V(VSB50 V~7V Auxiliary Supply Voltage, V(AUX33) V~7V Output Current Limit, (LIMIT .1.5A Continuous Power Dissipation, Note 1.1.1W Electrostatic Discharge Susceptibility, Human Body Mode.2kV Operating Ambient Temperature Range, Storage Temperature Range, Tstorage +125 Operating Junction Temperature Range, +130 Lead Temperature Soldering seconds, T(LEAD) .260
Advanced Analog Technology, Inc.
Page
AAT1203
Note 1The device deteriorates with increase ambient temperature, Thermal Information section.
Recommended Operating Conditions
Parameter Main Supply Input, VCC50 Standby Supply Input, VSB50 3.3V Auxiliary Supply Input, AUX33 Load Capacitance, 4.23 4.70 5.17 Unit
Load Current, Ambient Temperature,
Electrical Characteristics Over Recommended Operating Free-Air Temperature, 4.7µF (Unless Otherwise Specified)
Parameter
Inputs 3.3V Output Line Regulation Voltage
Load Regulation Voltage Quiescent Supply Current Out33 Load Current Output Current Limit Thermal Shutdown
(Note
Symbol
VCC50 VSB50 OUT33
LIMIT TTSD Thys (REV (SWITCH
Test Condition
250mA
VSB50 VCC50 4.5V 5.5V From VCC50 VSB50 terminals, 250mA From AUX33 terminal, Out33 Output short
3.135
0.25
3.300
4.05
Unit
3.465
Thermal Hysteresis (Note Load Capacitance Reverse Leakage Output Current Threshold Voltage, Threshold Voltage, High Auxiliary Switch Resistance Thermal Impedance, Junction-to-Ambient (Note
4.25
Minimal insure stability regulated output Tested grounded input AUX33, VSB50 VCC50 GND, Out33 3.3V VSB50 VCC50 VSB50 VCC50 VSB50 VCC50 AUX33 3.3V, 150mA Without copper heat spreading With copper heat spreading
3.85
Advanced Analog Technology, Inc.
Page
AAT1203
Note 2Design targets only. tested production. Note 3Please refer "Thermal Information"
Block Diagram
Advanced Analog Technology, Inc.
Page
AAT1203
VCC50
VSB50
3.3V
3.3V
AUX33
VCC50 Detector
Control
VSB50 Detector
OUT33
Resistance
Over Temperature Protection
Advanced Analog Technology, Inc.
Page
AAT1203
Typical Characteristics
Fig.
3.3V VCC50 Cold Start
Fig.
3.3V VUX33 Cold Start
Advanced Analog Technology, Inc.
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AAT1203
Typical Characteristics
Fig.
3.3V VCC50 Power (VSB50=5V)
Fig.
3.3V VCC50 Power (AUX33=3.3V)
Advanced Analog Technology, Inc.
Page
AAT1203
Typical Characteristics
Fig.
3.3V VSB50 Power (AUX33=3.3V)
Fig.
3.3V VCC50 Power Down (VSB=5V)
Advanced Analog Technology, Inc.
Page
AAT1203
Typical Characteristics
Fig.
3.3V VCC50 Power Down (AUX33=3.3V)
Fig.
3.3V Load Transient Response Falling.
Advanced Analog Technology, Inc.
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AAT1203
Typical Characteristics
Fig.
3.3V Load Transient Response Rising
Advanced Analog Technology, Inc.
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AAT1203
Thermal Information
ensure reliable operation device, junction temperature output device must within safe operating areaSOA. This achieved having means dissipate heat generated from junction output structure. There components that contribute thermal resistance. They consist paths series. first path junction case thermal resistance, RJC; second path case ambient thermal resistance, RCA. overall junction ambient thermal resistance, RJA, determined RJARJCRCA Package board layout incorporated application determines ability efficiently dissipate heat from junction. operating junction temperature determined operation ambient temperature, junction power dissipation, junction temperature, equal following thermal equation PJRJCPJRCA PJRJA This particular application uses 8-pin SOIC package with standard lead frame with dedicated ground terminal. Hence, maximum power dissipation allowable operating ambient temperature maximum junction temperature determined PJTJ PJ15070/701.1W Worst case maximum power dissipation determined Normal operating maximum power dissipation
Note: thermal characteristics AAT1203 were measured using double-sided board with square inches copper area connected pins "heat spreading". multi- layer board construction with power planes will further enhance thermal performance package.
Advanced Analog Technology, Inc.
Page
AAT1203
Thermal Information (Cont.)
1.78
Power-W
0.591 0.425
Ambient Temperature
NOTE: These curves used guideline purposes only. particular application, more specijic thermal characterization required.
Power Dissipation Derating Curves
Application Information
VSB50 4.7F 0.1F 4.7F 0.1F 3.3V 4.7F AUX33 4.7F 0.1F
VCC50
AAT1203
OUT33
Typical Application Schematic Advanced Analog Technology, Inc.
Page
AAT1203
Package Dimension
8-Pin
SYMBOLS
DIMENSIONS MILLIMETERS DEMINSIONS INCHES 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 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.
Page
AAT1203
Tape Reel
8-Pin
Advanced Analog Technology, Inc.
Page
AAT1203
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.
Part Marking
SOP8 Marking
SOP8 Back Marking
Advanced Analog Technology, Inc.
Page
AAT1203
Ordering Information
Advanced Analog Technology, Inc.
Page

Details subject change without notice 250-mA MULTI-INPUT LOW-DROP

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