400-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH \DUAL -OUTPUT POWER MANA

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400-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH \DUAL -OUTPUT POWER MANA

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AAT1205
400-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH \DUAL -OUTPUT POWER MANAGEMENT
Features Complete Power Management Automatic Input Voltage Selection Input Voltage Hysteresis Source Detector With Description AAT1205 multi-input low-dropout regulator that provides dual constant output supply 3.3V 2.5V output capable driving 400-mA load. output (OUT25) disable connect EN25 GND. AAT1205 provides dual regulated power output systems that have 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. Transitions occur from input supply another without generating glitch outside specification range 3.3-V 2.5-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.
400-mA Load Current Capability With VCC50VSB50 AUX33 Input Source Integrated rDSonSwitch Dual Regulated Output 3.3Vfixed& 2.5V fixed Output Short Circuit Protection Configuration
VIEW
VSB50 VCC50 OUT33 AUX33 EN25 OUT25
8-PIN SOIC
Advanced Analog Technology, Inc.
January 2004
AAT1205
Functions 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 3.3-V regulated output 3.3-V auxiliary supply input 2.5-V regulated output Enable input OUT25 Ground Ground Description
absolute maximum ratings Main Supply voltage, VVCC50. -0.5V~7V Standby Supply voltage, VVSB50. -0.5V~7V Auxiliary Supply voltage, VAUX33. -0.5V~7V Output current limit, ILIMIT. 1.5A Continuous power dissipation, PDsee Note 1.6W Electrostatic discharge susceptibility, human body model.2kV Operating ambient temperature range, TA.0
Advanced Analog Technology, Inc.
January 2004
AAT1205
Storage temperature range, Tstg.-55 Operating junction temperature range, TJ.-5 Lead temperature soldering, second,TLEAD.260
NOTE 1The device deteriorate with increase ambient temperature, Thermal Information section.
Recommended operating conditions
main supply input, VCC50 standby supply input, VSB50 3.3V auxiliary supply input, AUX33 Load capacitance, Load current, Ambient temperature, 4.23 5.17 Unit
Advanced Analog Technology, Inc.
January 2004
AAT1205
Electrical Characteristics over recommended operating free-air temperature, 4.7µF (unless otherwise noted)
Parameter
VCC50 VSB50 OUT33 OUT25 inputs 3.3-V output 2.5-V output Iout33+Iout25 400mA Iout33=0, Iout25 300mA VSB50 VCC50 4.5V 5.5V mAIL250 From VCC50 VSB50 terminals, 400mA From AUX33 terminal, Out33 Out25 output shorted 4.45 4.65
Test Condition
3.135 2.375
Unit
3.465 2.625
VOVI Line regulation voltage VOIO Load regulation voltage Quiescent supply current IAUX IL33 IL25 ILIMIT TTSD Thys IIkgREV RSWITCH
Out33 load current Out25 load current Output current limit
Thermal shutdownNOTE Thermal hysteresisNOTE Load capacitance Minimal insure stability regulated output
Reverse leakage output current Tested input that grounded. AUX33, VSB50 VCC50 GND, Out33 3.3v Threshold voltage, VSB50 VCC50 Threshold voltage, high VSB50 VCC50 4.25 Auxiliary switch resistance VSB50 VCC50 AUX33 3.3V, 150mA Power soldered heat spreading copper Power soldered heat spreading copper
NOTE 2Design targets only. tested production. NOTE 3Please refer "Thermal Information"
Advanced Analog Technology, Inc.
January 2004
AAT1205
FUNCTIONAL BLOCK DIAGRAM
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.
January 2004
AAT1205
TYPICAL CHARACTERISTICS
Figure
3.3V VCC50 Cold Start
Figure
2.5V VCC50 Cold Start
Advanced Analog Technology, Inc.
January 2004
AAT1205
TYPICAL CHARACTERISTICS
Figure
3.3V AUX33 Cold Start
Figure
2.5V AUX33 Cold Start
Advanced Analog Technology, Inc.
January 2004
AAT1205
TYPICAL CHARACTERISTICS
Figure
3.3V VCC50 Power Up(VSB50=5V)
Figure
2.5V VCC50 Power Up(VSB50=5V)
Advanced Analog Technology, Inc.
January 2004
AAT1205
TYPICAL CHARACTERISTICS
Figure
3.3V VCC50 Power Up(AUX33=3.3V)
Figure
2.5V VCC50 Power Up(AUX33=3.3V)
Advanced Analog Technology, Inc.
January 2004
AAT1205
Advanced Analog Technology, Inc.
January 2004
AAT1205
TYPICAL CHARACTERISTICS
Figure
3.3V VSB50 Power Up(AUX33=3.3V)
Figure
2.5V VSB50 Power Up(AUX33=3.3V)
Advanced Analog Technology, Inc.
January 2004
AAT1205
TYPICAL CHARACTERISTICS
Figure
3.3V VCC50 Power Down(VSB=5V)
Figure
2.5V VCC50 Power Down(VSB=5V)
Advanced Analog Technology, Inc.
January 2004
AAT1205
TYPICAL CHARACTERISTICS
Figure
3.3V VCC50 Power Down(AUX33=3.3V)
Figure
2.5V VCC50 Power Down(AUX33=3.3V)
Advanced Analog Technology, Inc.
January 2004
AAT1205
TYPICAL CHARACTERISTICS
Figure
3.3V Load Transient Response Falling.
Figure
2.5V Load Transient Response Falling.
Advanced Analog Technology, Inc.
January 2004
AAT1205
TYPICAL CHARACTERISTICS
Figure
3.3V Load Transient Response Rising
Figure
2.5V Load Transient Response Rising
Advanced Analog Technology, Inc.
January 2004
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 junction case thermal resistance, RJC; second case ambient thermal resistance, RCA. overall junction ambient thermal resistance, RJA, determined RJARJCRCA ability efficiently dissipate heat from junction function package style board layout incorporated application. operating junction temperature determined operation ambient temperature, junction power dissipation, junction temperature, equal following thermal equation TJTAPJRJCPJRCA TJTAPJRJA AAT1205 housed thermal enhanced package where power located botton device. When power soldiered double side 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 PJTJTA/ 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.
January 2004
AAT1205
THERMAL INFORMATION
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.
January 2004
AAT1205
APPLICATION INFORMATION
VSB50 VCC50 3.3V AUX33 OUT25
AAT1205
OUT33 EN25
OUT33 FLOATING 2.5V
Typical Application Schematic Dual Output
VSB50 4.7F 0.1F 4.7F 0.1F 3.3V 4.7F AUX33 4.7F 0.1F
FLOATIN
VCC50
AAT1205
OUT33 EN25
OUT25
FLOATIN
Typical Application Schematic Only OUT33 Used
Advanced Analog Technology, Inc.
January 2004
AAT1205
Package Dimension
7°(4X)
7°(4X)
8REF.
6(MIN)
50TYP.
Symbol
Dimension
mils
Dimension 1.498 1.600 0.56 0.610 0.305 0.406 4.775 4.826 3.861 3.912 5.816 5.969
1.702 0.66 0.508 4.877 3.962 6.121
Advanced Analog Technology, Inc.
January 2004

400-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH \DUAL -OUTPUT POWER MANA

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