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| Advanced Analog Technology, Inc. AAT1204 400-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH VAUX SWITCH Features Complete Power Management Automatic Input Voltage Selection Input Voltage Source Detector With Hysteresis 400-mA Load Current Capability With VCC50 or VSB50 or AUX33 Input Source Integrated Low rDS (on) Switch Regulated Output 3.3V (fixed) Output Short Circuit Protection Pin Configuration TOP VIEW VSB50 1 2 3 4 8 7 6 5 GND GND GND GND VCC50 OUT33 AUX33 ( 8-PIN SOIC ) Description The AAT1204 is a multi-input low-dropout regulator that provides constant output supply 3.3V at the output capable of driving a 400-mA load. The AAT1204 provides regulated power output for systems that have multiple input sources and require constant voltage source with a low-dropout voltage. This is a intelligent power source selection device with a low-dropout regulator for either VCC50 or VSB50 inputs, and a low-resistance bypass switch for the AUX33 input. Transitions may occur from one input supply to another without generating a glitch outside of the specification range on the 3.3-V output. The device has an incorporated reverse-blocking scheme to prevent excess leakage from the input terminals in the event that the output voltage is greater than the input voltage. The input voltage is prioritized in the following order: VCC50, VSB50, AUX33. - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 Advanced Analog Technology, Inc. AAT1204 Functions Table INPUT VOLTAGE STATUS (V) VCC50 0 0 0 0 5 5 5 5 VSB50 0 0 5 5 0 0 5 5 AUX33 0 3.3 0 3.3 0 3.3 0 3.3 INPUT SELECTED VCC50/VSB50/AUX33 None AUX33 VSB50 VSB50 VCC50 VCC50 VCC50 VCC50 OUTPUT ] V^ ] OUT33 0 3.3 3.3 3.3 3.3 3.3 3.3 3.3 OUTPUT I^ ] mA^ Iout33 0 400 400 400 400 400 400 400 PIN Description TERMINAL NAME NO. VSB50 VCC50 OUT33 AUX33 GND GND GND GND 1 2 3 4 5 6 7 8 I/O I I O I I I I I 5-V standby supply input 5-V main supply input 3.3-V regulated output 3.3-V auxiliary supply input Ground Ground Ground Ground Description absolute maximum ratingsq * Main Supply voltage, V] VCC50^ .............................................................. -0.5V~7V * Standby Supply voltage, V] VSB50^ .......................................................... -0.5V~7V * Auxiliary Supply voltage, V] AUX33^ .......................................................... -0.5V~7V * Output current limit, I] LIMIT^ ....................................................................... 1.5A * Continuous power dissipation, PD] see Note 1^ .............................................. 1.1W * Electrostatic discharge susceptibility, human body model.......................................2kV * Operating ambient temperature range, TA................................................0J to 70J * Storage temperature range, Tstg.......................................................-55J to 150J * Operating junction temperature range, TJ...............................................-5J to 135J * Lead temperature ] soldering, 10 second^ ,T] LEAD^ ..........................................260J NOTE 1G The device deteriorate with increase in ambient temperature, TA. See Thermal Information section. - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 Advanced Analog Technology, Inc. AAT1204 Recommended operating conditions 5-V main supply input, VCC50 5-V standby supply input, VSB50 3.3V auxiliary supply input, AUX33 Load capacitance, CL Load current, IL Ambient temperature, TA Min 4.5 4.5 3 4.23 0 0 Typ Max 5.5 5.5 3.6 5.17 400 70 Unit V V V F mA J 4.7 Electrical Characteristics over recommended operating free-air temperature, TA = 0J J ,CL = 4.7F (unless otherwise noted) Parameter VCC50 VSB50 OUT33 VOVI^ ] VOIO^ ] I50 IAUX IL33 ILIMIT TTSD Thys CL IIkg REV^ ] VLO VHI R] SWITCH^ RJA 5-V inputs 3.3-V output Line regulation voltage Load regulation voltage Quiescent supply current Iout33 = 400mA VSB50 or VCC50 = 4.5V to 5.5V 20 mAO ILO 400 mA From VCC50 VSB50 terminals, IL= 0 to 400mA From AUX33 terminal, IL = 0A Out33 output short to 0v 150 15 Minimal ESR to insure stability of regulated output 4.7 50 4.0 4.25 4.2 4.45 4.4 4.65 0.4 NOTE2^ to 70 Test Condition Min 4.5 3.135 Typ 5 3.3 2 40 1.0 1.0 Max Unit 5.5 3.465 V V mV mV mA mA A J g F g A V V J /W 3.0 3.0 1.5 180 Out33 load current Output current limit Thermal shutdown] NOTE 2^ Thermal hysteresis] Load capacitance 0.4 Reverse leakage output current Tested for input that is grounded. AUX33, VSB50 or VCC50 = GND, Out33 = 3.3v Threshold voltage, low VSB50 or VCC50o Threshold voltage, high VSB50 or VCC50o VSB50 = VCC50 = 0V, Auxiliary switch resistance AUX33 = 3.3V, IL = 150mA Thermal impedance, Without copper for heat spreading Junction-to-ambient] NOTE3^ With copper for heat spreading 100 70 NOTE 2G Design targets only. Not tested in production. NOTE 3G Please refer to "Thermal Information" - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 Advanced Analog Technology, Inc. AAT1204 VCC50 VSB50 3.3V + - + - 3.3V AUX33 VCC50 Detector Control VSB50 Detector OUT33 Low on Resistance GND OVER TEMPERATURE PROTECTION GND GND GND - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 Advanced Analog Technology, Inc. AAT1204 TYPICAL CHARACTERISTICS Figure 1. 3.3V VCC50 Cold Start Figure 2. 3.3V AUX33 Cold Start - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 Advanced Analog Technology, Inc. AAT1204 TYPICAL CHARACTERISTICS Figure 3. 3.3V VCC50 Power Up(VSB50=5V) Figure 4. 3.3V VCC50 Power Up(AUX33=3.3V) - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 Advanced Analog Technology, Inc. AAT1204 TYPICAL CHARACTERISTICS Figure 5. 3.3V VSB50 Power Up(AUX33=3.3V) Figure 6. 3.3V VCC50 Power Down(VSB=5V) - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 Advanced Analog Technology, Inc. AAT1204 TYPICAL CHARACTERISTICS Figure 7. 3.3V VCC50 Power Down(AUX33=3.3V) Figure 8. 3.3V Load Transient Response Falling. TYPICAL CHARACTERISTICS - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 Advanced Analog Technology, Inc. AAT1204 Figure 9. 3.3V Load Transient Response Rising - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 Advanced Analog Technology, Inc. AAT1204 THERMAL INFORMATION To ensure reliable operation of the device, the junction temperature of the output device must be within the safe operating area] SOA^ . This is achieved by having a means to dissipate the heat generated from the junction of the output structure. There are two components that contribute to thermal resistance. They consist of two paths in series. The first is the junction to case thermal resistance, RJC; the second is the case to ambient thermal resistance, RCA. The overall junction to ambient thermal resistance, RJA, is determined byG RJAx RJCI RCA The ability to efficiently dissipate the heat from the junction is a function of the package style and board layout incorporated in the application. The operating junction temperature is determined by the operation ambient temperature, TA, and the junction power dissipation, PJ. The junction temperature, TJ, is equal to the following thermal equationG PJ] RCA^ TJx TAI PJ] RJC^I TJx TAI PJ] RJA^ This particular application uses the 8-pin SO package with standard lead frame with a dedicated ground terminal. Hence, the maximum power dissipation allowable for an operating ambient temperature of 70J , and a maximum junction temperature of 150J is determined asG PJx] TJ TA^ / RJA PJx] 150 70^ /70x 1.1W Worst case maximum power dissipation is determined byG PDx] 5.5 3.135^ x0.4x 0.946W Normal operating maximum power dissipation isG PDx] 5 3.3^ x0.4x 0.68W Note: The thermal characteristics of the AAT1204 were measured using a double-sided board with two square inches of copper area connected to the GND pins for "heat spreading". The use of multi-layer board construction with power planes will further enhance the thermal performance of the package. - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 Advanced Analog Technology, Inc. AAT1204 THERMAL INFORMATION 1.78 Power-W 0.946 0.68 25 83 102 150 Ambient Temperature - XC NOTE: These curves are to be used for guideline purposes only. particular application, a more specijic thermal characteriz required. or a F ation is Power Dissipation Derating Curves - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 Advanced Analog Technology, Inc. AAT1204 APPLICATION INFORMATION 1 VSB50 4.7g F 0.1g F 2 4.7g F 0.1g F 3 3.3V 4.7g F 4 AUX33 4.7g F 0.1g F GND 8 GND 7 VCC50 GND GND AAT1204 OUT33 GND 6 GND 5 GND GND Typical Application Schematic - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 Advanced Analog Technology, Inc. AAT1204 Package Dimension c L D E1 7X(4) 7X(4) 1 A 6(MIN) 50TYP. B REF. 8 eB Symbol A A1 B D E1 eB L c Dimension in mils Min Nom Max 59 63 67 22 24 26 12 16 20 188 190 192 152 154 156 229 235 241 24 --- Dimension in Min Nom 1.498 1.600 0.56 0.610 0.305 0.406 4.775 4.826 3.861 3.912 5.816 5.969 0.6 -- mm Max 1.702 0.66 0.508 4.877 3.962 6.121 -- 0 3 6 0 3 6 - - xAEWAniN/|-1/2q Advanced Analog Technology, Inc. V 1.0 |
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