Advanced Analog Technology, Inc. AAT1205 Details are subject to change without notice 400-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 400-mA Load Current Capability With VCC50、VSB50 or AUX33 Input Source z Integrated Low rDS(on ) Switch z Dual Regulated Output 3.3V（fixed）& 2.5V （fixed） z Output Short Circuit Protection (SCP) The AAT1205 is a multi-input low-dropout regulator (LDO) specially designed for LAN cards. It provides advanced dual constant output supply 3.3V & 2.5V at the output capable of driving a 400-mA load. The output (OUT25) can be disabled by connecting EN25 pin to GND. The AAT1205 is equipped with dual regulated power output for systems with multiple input sources and require dual constant voltage source with a low-dropout voltage. This is an 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. The AAT1205 allows transitions to progress smoothly from one input supply to another without generating a glitch outside of the specified range of 3.3V & 2.5V output. Furthermore, this device has an incorporated reverse-blocking scheme to prevent excessive 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 EN25 AUX33 4 5 OUT25 ( 8-PIN SOP ) – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 1 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Function Table INPUT VOLTAGE STATUS （V） EN25 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 OUT25 0 0 2.5 0 2.5 0 2.5 0 2.5 0 2.5 0 2.5 0 2.5 0 OUTPUT （I）（mA） Iout33+Iout25 0 0 400 400 400 400 400 400 400 400 400 400 400 400 400 400 Pin Description TERMINAL NAME NO. VSB50 VCC50 OUT33 AUX33 OUT25 EN25 GND GND 1 2 3 4 5 6 7 8 I/O I I O I O I I I Description 5V Standby Supply Input 5V Main Supply Input 3.3V Regulated Output 3.3V Auxiliary Supply Input 2.5V Regulated Output Enable Input of OUT25 Ground Ground – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 2 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Absolute Maximum Ratings┼ • Main Supply Voltage, V(VCC50 ) …………….…….………………………………... − 0.5 V~7V • Standby Supply Voltage, V(VSB50 ) ……………….………………………………… − 0.5 V~7V • Auxiliary Supply Voltage, V(AUX33) …………….……………………….…....….... − 0.5 V~7V • Output Current Limit, I (LIMIT ) ………………………………….…………….………1.5A • Continuous Power Dissipation, Pd （see Note 1）…………….…………………… 1.6W • Electrostatic Discharge Susceptibility, Human Body Mode………………….……….2kV • Operating Ambient Temperature Range, TC ……………….……………..…………0℃ to 70℃ • Storage Temperature Range, Tstorage …………….…………….…………………….. − 45 ℃ to +125℃ • Operating Junction Temperature Range, TJ …………….………………...……........ − 5 ℃ to +130℃ • Lead Temperature （Soldering for 10 seconds）, T(LEAD) ………………….……….260℃ Note 1：The device deteriorates with increase in ambient temperature, TC . See Thermal Information section. Recommended Operating Conditions Parameter 5V Main Supply Input, VCC50 5V Standby Supply Input, VSB50 3.3V Auxiliary Supply Input, AUX33 Load Capacitance, C L Load Current, I L Ambient Temperature, TC Min 4.5 Typ Max 5.5 Unit V 4.5 - 5.5 V 3.0 - 3.6 V 4.23 4.70 5.17 0 400 µF 0 - 70 mA ℃ – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 3 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Electrical Characteristics Over Recommended Operating Free-Air Temperature, TC = 0℃ to 70℃, CL = 4.7µF (unless otherwise specified) Parameter 5V Inputs 3.3V Output 2.5V Output Symbol VCC50 VSB50 OUT33 Test Condition Min Typ Max Unit 4.5 5.0 5.5 V I out 33 + I out 25 = 400mA 3.135 3.300 3.465 V I out 33 =0, I out 25 = 300mA 2.375 2.500 2.625 V Line Regulation Voltage OUT25 ∆VO (∆VI ) VSB50 or VCC50 = 4.5V to 5.5V - 2 - mV Load Regulation Voltage ∆VO (∆IO ) 20 mA＜ I L ＜250 mA - 40 - mV Quiescent Supply Current I 50 - 1.0 3.0 mA - 1.0 3.0 mA 0.4 - - 0.3 - - - - 1.5 I AUX I AUX Out33 Load Current I L33 Out25 Load Current I L 25 From VCC50 VSB50 terminals, I L = 0 to 400mA From AUX33 terminal, I L = 0A Out33 or Out25 output shorted to 0V A Output Current Limit I LIMIT Thermal Shutdown (Note 2) Thermal Hysteresis (Note 2) TTSD 150 - 180 Thys - 15 - - 4.7 - µF - - 50 µA 4.0 4.2 4.4 V 4.25 4.45 4.65 V - - 0.4 Ω - 80 - - 50 - Load Capacitance CL Reverse Leakage Output Current I Ikg (REV ) Threshold Voltage, Low VLO Threshold Voltage, High VHI Auxiliary Switch Resistance R SWITCH R θJA Minimal ESR to insure stability of regulated output Tested for input that is grounded. AUX33, VSB50 or VCC50 = GND, Out33 = 3.3V VSB50 or VCC50↓ VSB50 or VCC50↑ VSB50 = VCC50 = 0V, AUX33 = 3.3V, I L = 150mA Power Pad is not soldered on the heat spreading copper Power Pad is soldered on the heat spreading copper 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. – Page 4 of 21 V 1.0 ℃ ℃/ W Advanced Analog Technology, Inc. AAT1205 Function Block VCC50 VSB50 3.3V + + - - VCC50 Detector 3.3V VSB50 Detector Control OUT33 AUX33 Low on Resistance GND Over Temperature Protection 2.5V EN25 + OUT25 – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 5 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Typical Characteristics Fig. 1. 3.3V VCC50 Cold Start Fig. 2. 2.5V VCC50 Cold Start – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 6 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Typical Characteristics Fig. 3. 3.3V AUX33 Cold Start Fig. 4. 2.5V AUX33 Cold Start – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 7 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Typical Characteristics Fig. 5. 3.3V VCC50 Power Up (VSB50=5V) Fig. 6. 2.5V VCC50 Power Up (VSB50=5V) – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 8 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Typical Characteristics Fig. 7. 3.3V VCC50 Power Up (AUX33=3.3V) Fig. 8. 2.5V VCC50 Power Up (AUX33=3.3V) – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 9 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Typical Characteristics Fig. 9. 3.3V VSB50 Power Up (AUX33=3.3V) Fig. 10. 2.5V VSB50 Power Up (AUX33=3.3V) – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 10 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Typical Characteristics Fig.11. 3.3V VCC50 Power Down (VSB=5V) Fig. 12. 2.5V VCC50 Power Down (VSB=5V) – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 11 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Typical Characteristics Fig. 13. 3.3V VCC50 Power Down (AUX33=3.3V) Fig. 14. 2.5V VCC50 Power Down (AUX33=3.3V) – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 12 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Typical Characteristics Fig. 15. 3.3V Load Transient Response Falling Fig. 16. 2.5V Load Transient Response Falling – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 13 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Typical Characteristics Fig. 17. 3.3V Load Transient Response Rising Fig. 18. 2.5V Load Transient Response Rising – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 14 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 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 path is the junction to case thermal resistance, RJC; the second path is the case to ambient thermal resistance, RCA. The overall junction to ambient thermal resistance, RJA, is determined by： RJA＝RJC＋RCA Package and board layout incorporated in the application determines the ability to efficiently dissipate the heat from the junction. The operating junction temperature is determined by the operation ambient temperature, TC, and the junction power dissipation, PJ. The junction temperature, TJ, is equal to the following thermal equation： TJ＝TC＋PJ（RJC）＋PJ（RCA） TJ＝TC＋PJ（RJA） The AAT1205 is housed in a thermal enhanced package where the power pad is located in the bottom of the device. When the power pad is soldered on a double-sided printed circuit board with two square inches of copper allocated for "heat spreading", the resulting θJA is 50℃/W. 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－TC）/ RJA PJ＝（150－70）/50＝1.6W Worst case maximum power dissipation is determined by： Pd＝（5.5－2.375）×0.3+(5.5-3.135) ×0.1＝0.0.9375+0.2365=1.174W Normal operating maximum power dissipation is： Pd＝（5－2.5）×0.3+(5-3.3) ×0.1＝0.75+0.17=0.92W Note: All thermal characteristics of the AAT1205 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. – Page 15 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Thermal Information (Cont.) Power-W 2.5 1.174 0.92 25 91 104 150 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 PCB Layout Example – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 16 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Application Information 1 4.7μ F 8 4.7μ F GND VCC50 GND 0.1μ F 2 3.3V VSB50 0.1μ F AAT1205 3 OUT33 EN25 AUX33 OUT25 7 6 TO OUT33 or FLOATING 4.7μ F 5 4 4.7μ F 2.5V 4.7μ F 0.1μ 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 AAT1205 OUT33 EN25 AUX33 OUT25 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. – Page 17 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Package Dimension 8-PIN SOP θ SYMBOL S DIMENSIONS IN MIN TYP MAX DEMINSIONS IN MIN TYP MAX A 1.47 1.60 1.73 0.058 0.063 0.068 A1 0.10 --- 0.22 0.004 --- 0.008 A2 --- 1.45 --- --- 0.057 --- b 0.33 0.41 0.51 0.013 0.016 0.020 C 0.19 0.20 0.25 0.0075 0.008 0.0098 D 4.80 4.85 4.95 0.189 0.191 0.195 E 5.80 6.00 6.20 0.228 0.236 0.244 E1 3.80 3.90 4.00 0.150 0.154 0.157 e --- 1.27 --- --- 0.050 --- L 0.38 0.71 1.27 0.015 0.028 0.050 y --- --- 0.076 --- --- 0 θ 0 --- 0 0 --- 0 – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 18 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Tape and Reel 8-Pin SOP – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 19 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Tape and Reel 8-Pin SOP (Cont.) NOTE: 1. 10 SPROCKET HOLE PITCH CUMULATIVE TOLERANCE ± 0.2 MILLIMETERS. 2. CAMBER NOT TO EXCEED 1 MILLIMETER IN 100 MILLIMETERS 3. MATERIAL: ANTI-STATIC BLACK ADVANTEK POLYSTYRENE. 4. A 0 AND B 0 ARE MEASURED ON A PLANE 0.3 MILLIMETERS ABOVE THE BOTTOM OF THE POCKET. 5. K 0 IS MEASURED FROM A PLANE ON THE INSIDE BOTTOM OF THE POCKET TO THE TOP SURFACE OF 6. THE CARRIER. POCKET POSITION RELATIVE TO SPROCKET HOLE IS MEASURED AS TRUE POSITION OF POCKET, NOT POCKET HOLE. Part Marking SOP8 Top Marking AAT1205 XXXXXX SOP8 Back Marking YYWW – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 20 of 21 V 1.0 Advanced Analog Technology, Inc. AAT1205 Ordering Information – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 21 of 21 V 1.0