Details subject change without notice 400-mA MULTI-INPUT LOW-DROP

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Details subject change without notice 400-mA MULTI-INPUT LOW-DROP

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AAT1205
Details subject change without notice
400-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH DUAL OUTPUT POWER MANAGEMENT Features
Complete Power Management Automatic Input Voltage Selection Input Voltage Source Detector With Hysteresis 400-mA Load Current Capability With VCC50VSB50 AUX33 Input Source Integrated rDS(on Switch Dual Regulated Output 3.3Vfixed& 2.5V fixed Output Short Circuit Protection (SCP)
Description
AAT1205 multi-input low-dropout regulator (LDO) specially designed cards. provides advanced dual constant output supply 3.3V 2.5V output capable driving 400-mA load. output (OUT25) disabled connecting EN25 GND. AAT1205 equipped with dual regulated power output systems with multiple input sources require dual 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. AAT1205 allows transitions progress smoothly from input supply another without generating glitch outside specified range 3.3V 2.5V output. Furthermore, this device incorporated reverse-blocking scheme prevent excessive leakage from input terminals event that output voltage greater than input voltage. input voltage prioritized following order: VCC50, VSB50, AUX33.
Configuration
VIEW
VSB50 VCC50 OUT33 AUX33 EN25 OUT25
8-PIN
Advanced Analog Technology, Inc.
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AAT1205
Function Table
INPUT VOLTAGE STATUS EN25 VCC50 VSB50 AUX33 INPUT SELECTED VCC50/VSB50/AUX33 None None AUX33 AUX33 VSB50 VSB50 VSB50 VSB50 VCC50 VCC50 VCC50 VCC50 VCC50 VCC50 VCC50 VCC50 OUTPUT OUT33 OUT25 OUTPUT Iout33+Iout25
Description
TERMINAL NAME VSB50 VCC50 OUT33 AUX33 OUT25 EN25 Standby Supply Input Main Supply Input 3.3V Regulated Output 3.3V Auxiliary Supply Input 2.5V Regulated Output Enable Input OUT25 Ground Ground Description
Advanced Analog Technology, Inc.
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AAT1205
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 1.6W 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
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, Load Current, Ambient Temperature, Unit
4.23 4.70 5.17
Advanced Analog Technology, Inc.
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AAT1205
Electrical Characteristics Over Recommended Operating Free-Air Temperature, 4.7µF (unless otherwise specified)
Parameter
Inputs 3.3V Output 2.5V Output Line Regulation Voltage
Load Regulation Voltage Quiescent Supply Current Out33 Load Current Out25 Load Current Output Current Limit Thermal Shutdown (Note Thermal Hysteresis (Note Load Capacitance Reverse Leakage Output Current Threshold Voltage, Threshold Voltage, High Auxiliary Switch Resistance
Symbol
VCC50 VSB50 OUT33 OUT25
LIMIT TTSD Thys (REV SWITCH
Test Condition
3.300 2.500
4.45
3.465 2.625
4.65
Unit
400mA 300mA
VSB50 VCC50 4.5V 5.5V From VCC50 VSB50 terminals, 400mA From AUX33 terminal,
3.135 2.375
Out33 Out25 output shorted
Minimal insure stability regulated output Tested input that grounded. AUX33, VSB50 VCC50 GND, Out33 3.3V VSB50 VCC50 VSB50 VCC50 VSB50 VCC50 AUX33 3.3V, 150mA Power soldered heat spreading copper Power soldered heat spreading copper
4.25
Note 2Design targets only. tested production. Note 3Please refer "Thermal Information"
Advanced Analog Technology, Inc.
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AAT1205
Function Block
VCC50
VSB50
3.3V
3.3V
VCC50 Detector
Control
VSB50 Detector
OUT33
AUX33
Resistance
EN25 OUT25
Over Temperature Protection
2.5V
Advanced Analog Technology, Inc.
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AAT1205
Typical Characteristics
Fig. 3.3V VCC50 Cold Start
Fig. 2.5V VCC50 Cold Start
Advanced Analog Technology, Inc.
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AAT1205
Typical Characteristics
Fig. 3.3V AUX33 Cold Start
Fig. 2.5V AUX33 Cold Start
Advanced Analog Technology, Inc.
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AAT1205
Typical Characteristics
Fig. 3.3V VCC50 Power (VSB50=5V)
Fig.
2.5V VCC50 Power (VSB50=5V)
Advanced Analog Technology, Inc.
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AAT1205
Typical Characteristics
Fig. 3.3V VCC50 Power (AUX33=3.3V)
Fig. 2.5V VCC50 Power (AUX33=3.3V)
Advanced Analog Technology, Inc.
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AAT1205
Typical Characteristics
Fig. 3.3V VSB50 Power (AUX33=3.3V)
Fig. 2.5V VSB50 Power (AUX33=3.3V)
Advanced Analog Technology, Inc.
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AAT1205
Typical Characteristics
Fig.11. 3.3V VCC50 Power Down (VSB=5V)
Fig. 2.5V VCC50 Power Down (VSB=5V)
Advanced Analog Technology, Inc.
Page
AAT1205
Typical Characteristics
Fig. 3.3V VCC50 Power Down (AUX33=3.3V)
Fig. 2.5V VCC50 Power Down (AUX33=3.3V)
Advanced Analog Technology, Inc.
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AAT1205
Typical Characteristics
Fig.
3.3V Load Transient Response Falling
Fig.
2.5V Load Transient Response Falling
Advanced Analog Technology, Inc.
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AAT1205
Typical Characteristics
Fig.
3.3V Load Transient Response Rising
Fig.
2.5V Load Transient Response Rising
Advanced Analog Technology, Inc.
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AAT1205
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 TJTCPJRJCPJRCA TJTCPJRJA AAT1205 housed thermal enhanced package where power located bottom device. When power soldered double-sided printed circuit board with square inches copper allocated "heat spreading", resulting 50/W. Hence, maximum power dissipation allowable operating ambient temperature maximum junction temperature determined PJTJTC/ PJ15070/501.6W Worst case maximum power dissipation determined Normal operating maximum power dissipation
Note: thermal characteristics AAT1205 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.
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AAT1205
Thermal Information (Cont.)
Power-W
1.174 0.92
Ambient Temperature Note: These curves used guideline purposes only. particular application, more specijic thermal characterization required. Power Dissipation Derating Curves
Layout Example
Advanced Analog Technology, Inc.
Page
AAT1205
Application Information
VSB50 VCC50
3.3V
AAT1205
OUT33 EN25
OUT33 FLOATING 2.5V
AUX33 OUT25
Typical Application Schematic Dual Output
4.7F 0.1F 4.7F 0.1F 3.3V 4.7F 4.7F 0.1F
VSB50
FLOATIN
VCC50
AAT1205
OUT33 EN25
AUX33
OUT25
FLOATIN
Typical Application Schematic Only OUT33 Used
Advanced Analog Technology, Inc.
Page
AAT1205
Package Dimension
8-PIN
SYMBOL
DIMENSIONS
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 -1.73 0.22 -0.51 0.25 4.95 6.20 4.00 -1.27 0.076
DEMINSIONS
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 -0.068 0.008 -0.020 0.0098 0.195 0.244 0.157 -0.050
Advanced Analog Technology, Inc.
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AAT1205
Tape Reel
8-Pin
Advanced Analog Technology, Inc.
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AAT1205
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
AAT1205 XXXXXX
SOP8 Back Marking
YYWW
Advanced Analog Technology, Inc.
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AAT1205
Ordering Information
Advanced Analog Technology, Inc.
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Details subject change without notice 400-mA MULTI-INPUT LOW-DROP

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