250-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH VAUX SWITCH Feature

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250-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH VAUX SWITCH Feature

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AAT1203
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 (on) Switch Regulated Output 3.3V (fixed) Output Short Circuit Protection Configuration
VIEW
VSB50 VCC50 OUT33 AUX33
8-PIN SOIC
Description AAT1203 multi-input low-dropout regulator that provides constant output supply 3.3V output capable driving 250-mA load. AAT1203 provides 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. Transitions occur from input supply another without generating glitch outside specification 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.
January 2004
AAT1203
Functions 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 standby supply input main supply input 3.3-V regulated output 3.3-V auxiliary supply input Ground Ground 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 1.1W Electrostatic discharge susceptibility, human body model.2kV Operating ambient temperature range, TA.0 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.
Advanced Analog Technology, Inc.
January 2004
AAT1203
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
Electrical Characteristics over recommended operating free-air temperature, 4.7µF (unless otherwise noted)
Parameter
VCC50 VSB50 OUT33 VOVI VOIO IAUX IL33 ILIMIT TTSD Thys IIkg inputs 3.3-V output Line regulation voltage Load regulation voltage Quiescent supply current
Test Condition
Unit
3.465
Out33 load current Output current limit
Iout33 250mA 3.135 VSB50 VCC50 4.5V 5.5V mAIL250 From VCC50 VSB50 terminals, 250mA From AUX33 terminal, 0.25 Out33 output short
Thermal shutdownNOTE Thermal hysteresisNOTE2 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 VSB50 VCC50 RSWITCH Auxiliary switch resistance AUX33 3.3V, 150mA Thermal impedance, Without copper heat spreading Junction-to-ambientNOTE3 With copper heat spreading NOTE 2Design targets only. tested production. NOTE 3Please refer "Thermal Information"
3.85
4.05
4.25
Advanced Analog Technology, Inc.
January 2004
AAT1203
VCC50
VSB50
3.3V
3.3V
AUX33
VCC50 Detector
Control
VSB50 Detector
OUT33
Resistance
OVER TEMPERATURE PROTECTION
Advanced Analog Technology, Inc.
January 2004
AAT1203
TYPICAL CHARACTERISTICS
Figure
3.3V VCC50 Cold Start
Figure
3.3V VUX33 Cold Start
Advanced Analog Technology, Inc.
January 2004
AAT1203
TYPICAL CHARACTERISTICS
Figure
3.3V VCC50 Power Up(VSB50=5V)
Figure
3.3V VCC50 Power Up(AUX33=3.3V)
Advanced Analog Technology, Inc.
January 2004
AAT1203
TYPICAL CHARACTERISTICS
Figure
3.3V VSB50 Power Up(AUX33=3.3V)
Figure
3.3V VCC50 Power Down(VSB=5V)
Advanced Analog Technology, Inc.
January 2004
AAT1203
TYPICAL CHARACTERISTICS
Figure
3.3V VCC50 Power Down(AUX33=3.3V)
Figure
3.3V Load Transient Response Falling.
Advanced Analog Technology, Inc.
January 2004
AAT1203
TYPICAL CHARACTERISTICS
Figure
3.3V Load Transient Response Rising
Advanced Analog Technology, Inc.
January 2004
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 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 This particular application uses 8-pin package with standard lead frame with dedicated ground terminal. Hence, maximum power dissipation allowable operating ambient temperature maximum junction temperature determined PJTJTA/ 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.
January 2004
AAT1203
THERMAL INFORMATION
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.
January 2004
AAT1203
Package Dimension
7°(4X)
7°(4X)
6(MIN)
50TYP.
8REF.
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

250-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH VAUX SWITCH Feature

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