Advanced Analog Technology, Inc. AAT1202 250-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH DUAL -OUTPUT POWER MANAGEMENT Features Description z Complete Power Management z Automatic Input Voltage Selection z Input Voltage Source Detector With Hysteresis z 250-mA Load Current Capability With VCC50 or VSB50 or AUX33 Input Source z Integrated Low rDS (on) Switch z Dual Regulated Output 3.3V (fixed) & 1.8V (fixed) z Output Short Circuit Protection The AAT1202 is a multi-input low-dropout regulator that provides dual constant output supply 3.3V & 1.8V at the output capable of driving a 250-mA load. The output (OUT18) can be disable by connect EN18 pin to GND. The AAT1202 provides dual regulated power output for systems that have multiple input sources and require dual 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 & 1.8-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. Pin Configuration TOP VIEW VSB50 1 8 GND VCC50 2 7 GND OUT33 3 6 EN18 AUX33 4 5 OUT18 ( 8-PIN SOIC ) – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 Functions Table INPUT VOLTAGE STATUS （V） EN18 Hi Low Hi Low Hi Low Hi Low Hi Low Hi Low Hi Low Hi Low VCC50 0 0 0 0 0 0 0 0 5 5 5 5 5 5 5 5 VSB50 0 0 0 0 5 5 5 5 0 0 0 0 5 5 5 5 INPUT SELECTED AUX33 0 0 3.3 3.3 0 0 3.3 3.3 0 0 3.3 3.3 0 0 3.3 3.3 VCC50/VSB50/AUX33 None None AUX33 AUX33 VSB50 VSB50 VSB50 VSB50 VCC50 VCC50 VCC50 VCC50 VCC50 VCC50 VCC50 VCC50 OUTPUT （V） OUT33 0 0 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 OUT18 0 0 1.8 0 1.8 0 1.8 0 1.8 0 1.8 0 1.8 0 1.8 0 OUTPUT （I）（mA） Iout33+Iout18 0 0 250 250 250 250 250 250 250 250 250 250 250 250 250 250 Pin Description TERMINAL NAME NO. VSB50 VCC50 OUT33 AUX33 OUT18 EN18 GND GND 1 2 3 4 5 6 7 8 I/O I I O I O I I I Description 5-V standby supply input 5-V main supply input 3.3-V regulated output 3.3-V auxiliary supply input 1.8-V regulated output Enable input of OUT18 Ground Ground absolute maximum ratings┼ • 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……………….……………..…………0℃ to 70℃ • Storage temperature range, Tstg…………….…………….…………………..-55℃ to 150℃ – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 • Operating junction temperature range, TJ…………….………………...……....-5℃ to 130℃ • Lead temperature （soldering, 10 second）,T（LEAD）………………….…………..…...260℃ NOTE 1：The device deteriorate with increase in ambient temperature, TA. See Thermal Information section. 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 – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. Typ 4.7 Max 5.5 5.5 3.6 5.17 250 70 Unit V V V µF mA ℃ V 0.1 Advanced Analog Technology, Inc. AAT1202 Electrical Characteristics over recommended operating free-air temperature, TA = 0℃ to 70℃,CL = 4.7µF (unless otherwise noted) Parameter VCC50 VSB50 OUT33 OUT18 Test Condition 5-V inputs 3.3-V output 1.8-V output Iout33+Iout18 = 250mA Iout33=0, Iout18 = 200mA △VO（△VI） Line regulation voltage △VO（△IO） Load regulation voltage I50 Quiescent supply current Min Typ 4.5 5 5.5 3.135 1.71 3.3 1.8 3.465 1.89 VSB50 or VCC50 = 4.5V to 5.5V 20 mA＜IL＜250 mA From VCC50 VSB50 terminals, IL= 0 to 250mA From AUX33 terminal, IL = 0A IAUX IL33 IL18 ILIMIT Out33 load current Out18 load current Output current limit TTSD Thermal shutdown（NOTE 2） Thys Thermal hysteresis（NOTE 2） CL Load capacitance Max Unit 2 40 1.0 3.0 mA 1.0 3.0 mA Out33 or Out18 output shorted to 0V Reverse leakage output current Tested for input that is grounded. AUX33, VSB50 or VCC50 = GND, Out33 = 3.3v VLO Threshold voltage, low VSB50 or VCC50↓ VHI Threshold voltage, high VSB50 or VCC50↑ VSB50 = VCC50 = 0V, R（SWITCH） Auxiliary switch resistance AUX33 = 3.3V, IL = 150mA RθJA Thermal impedance, Without copper for heat spreading Junction-to-ambient（NOTE3） With copper for heat spreading 1.5 150 A 180 ℃ 15 4.7 IIkg（REV） 3.85 4.1 V V mV mV 0.25 0.2 Minimal ESR to insure stability of regulated output V 4.05 4.3 100 70 µF 50 µA 4.25 4.5 0.4 V V Ω ℃/W NOTE 2：Design targets only. Not tested in production. NOTE 3：Please refer to "Thermal Information" – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 VCC50 VSB50 3.3V + + - - VCC50 Detector AUX33 3.3V VSB50 Detector Control Low on Resistance GND OVER TEMPERATURE PROTECTION 1.8V OUT33 EN18 + - – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. OUT18 V 0.1 Advanced Analog Technology, Inc. AAT1202 TYPICAL CHARACTERISTICS Figure 1. 3.3V VCC50 Cold Start Figure 2. 1.8V VCC50 Cold Start – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 TYPICAL CHARACTERISTICS Figure 3. 3.3V AUX33 Cold Start Figure 4. 1.8V AUX33 Cold Start – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 TYPICAL CHARACTERISTICS Figure 5. 3.3V VCC50 Power Up(VSB50=5V) Figure 6. 1.8V VCC50 Power Up(VSB50=5V) – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 TYPICAL CHARACTERISTICS Figure 7. 3.3V VCC50 Power Up(AUX33=3.3V) Figure 8. 1.8V VCC50 Power Up(AUX33=3.3V) – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 TYPICAL CHARACTERISTICS Figure 9. 3.3V VSB50 Power Up(AUX33=3.3V) Figure 10. 1.8V VSB50 Power Up(AUX33=3.3V) – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 TYPICAL CHARACTERISTICS Figure 11. 3.3V VCC50 Power Down(VSB=5V) Figure 12. 1.8V VCC50 Power Down(VSB=5V) – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 TYPICAL CHARACTERISTICS Figure 13. 3.3V VCC50 Power Down(AUX33=3.3V) Figure 14. 1.8V VCC50 Power Down(AUX33=3.3V) – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 TYPICAL CHARACTERISTICS Figure 15. 3.3V Load Transient Response Falling. Figure 16. 1.8V Load Transient Response Falling. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 TYPICAL CHARACTERISTICS Figure 17. 3.3V Load Transient Response Rising Figure 18. 1.8V Load Transient Response Rising – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 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 by： RJA＝RJC＋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 equation： TJ＝TA＋PJ（RJC）＋PJ（RCA） TJ＝TA＋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 70℃, and a maximum junction temperature of 150℃ is determined as： PJ＝（TJ－TA）/ RJA PJ＝（150－70）/70＝1.1W Worst case maximum power dissipation is determined by： PD＝（5.5－1.71）×0.25＝0.9475W Normal operating maximum power dissipation is： PD＝（5－1.8）×0.25＝0.8W Note: The thermal characteristics of the AAT1202 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. – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 THERMAL INFORMATION Power-W 1.78 0.947 0.8 25 83 94 150 Ambient Temperature - °C NOTE: These curves are to be used for guideline purposes only. For a particular application, a more specijic thermal characterization is required. Power Dissipation Derating Curves – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 APPLICATION INFORMATION 1 4.7 μ F 8 4.7 μ F GND VCC50 GND 0.1 μ F 2 3.3V VSB50 0.1 μ F AAT1202 3 OUT33 EN18 AUX33 OUT18 7 6 TO OUT33 or FLOATING 4.7 μ F 5 4 4.7 μ F 1.8V 0.1 μ F 4.7 μ F Typical Application Schematic - Dual Output 1 4.7μF GND VCC50 GND 8 GND or FLOATIN 0.1μF 2 4.7μF VSB50 0.1μF 3 3.3V AAT1202 OUT33 EN18 AUX33 OUT18 7 6 GND 4.7μF 4 4.7μF 5 0.1μF GND or FLOATIN Typical Application Schematic - Only OUT33 Used – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1 Advanced Analog Technology, Inc. AAT1202 Package Dimension θ L D E1 7°(4X) A1 8REF. 7°(4X) 6(MIN) 50TYP. B eB Symbol A A1 B D E1 eB L θ 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 --- 0º 3º 6º 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 -- 0º 3º mm Max 1.702 0.66 0.508 4.877 3.962 6.121 -- 6º – 台灣類比科技股份有限公司 – Advanced Analog Technology, Inc. V 0.1