Advanced Analog Technology, Inc. AAT1203 Details are subject to change without notice 250-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH VAUX SWITCH Features 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 Regulated Output 3.3V (fixed) z Output Short Circuit Protection Pin Configuration TOP VIEW VSB50 1 8 GND VCC50 2 7 GND 3 6 GND 4 5 GND OUT33 AUX33 ( 8-PIN SOP ) Description The AAT1203 is a multi-input low-dropout regulator designed for LAN cards. It provides constant output supply 3.3V at an output capable of driving a 250-mA load. The AAT1203 is equipped with regulated power output for systems that have multiple input sources and require 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 AAT1203 allows transitions to progress smoothly from one input supply to another without generating a glitch outside of the specified range of 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. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 1 of 16 V 1.0 Advanced Analog Technology, Inc. AAT1203 Function 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 OUTPUT （V） VCC50/VSB50/AUX33 None AUX33 VSB50 VSB50 VCC50 VCC50 VCC50 VCC50 OUT33 0 3.3 3.3 3.3 3.3 3.3 3.3 3.3 OUTPUT （I）（mA） Iout33 0 250 250 250 250 250 250 250 Pin Description TERMINAL NAME TERMINAL NO. I/O VSB50 VCC50 OUT33 AUX33 GND GND GND GND 1 2 3 4 5 6 7 8 I I O I I I I I DESCRIPTION 5V Standby Supply Input 5V Main Supply Input 3.3V Regulated Output 3.3V Auxiliary Supply Input Ground Ground Ground Ground 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）…………….………………….1.1W • 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℃ – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 2 of 16 0 V 1. Advanced Analog Technology, Inc. AAT1203 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 Min 4.5 4.5 3.0 4.23 Typ 4.70 Max 5.5 5.5 3.6 5.17 Unit V V V µF Load Current, I L 0 - 250 mA Ambient Temperature, TC 0 - 70 ℃ Electrical Characteristics Over Recommended Operating Free-Air Temperature, TC = 0℃ to 70℃, CL = 4.7µF (Unless Otherwise Specified) Parameter Symbol Test Condition Min Typ 4.5 5.0 5.5 V 3.135 3.300 3.465 V VSB50 or VCC50 = 4.5V to 5.5V - 2 - mV 20 mA＜ I L ＜250 mA - 40 - mV From VCC50 VSB50 terminals, I L = 0mA to 250mA - 1.0 3.0 mA From AUX33 terminal, I L = 0A - 1.0 3.0 mA 0.25 - - - - 1.5 TTSD 150 - 180 Thermal Hysteresis (Note 2) Thys - 15 - Load Capacitance CL - 4.7 - μF - - 50 μA 3.85 4.05 4.25 V 4.1 4.3 4.5 V - - 0.4 Ω Without copper for heat spreading - 100 - With copper for heat spreading - 70 - 3.3V Output VCC50 VSB50 OUT33 I out 33 = 250mA Line Regulation Voltage ∆VO (∆VI ) Load Regulation Voltage ∆VO (∆IO ) 5V Inputs Quiescent Supply Current I 50 I AUX I AUX Out33 Load Current I L33 Output Current Limit Thermal Shutdown I LIMIT (Note 2) Reverse Leakage Output Current I Ikg (REV ) Threshold Voltage, Low VLO Threshold Voltage, High VHI Auxiliary Switch Resistance Thermal Impedance, Junction-to-Ambient (Note 3) R (SWITCH ) R θJA Out33 Output short to 0V A ℃ Minimal ESR to insure stability of regulated output Tested for grounded input AUX33, VSB50 or VCC50 = GND, Out33 = 3.3V VSB50 or VCC50↓ VSB50 or VCC50↑ VSB50 = VCC50 = 0V, AUX33 = 3.3V, I L = 150mA – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 3 of 16 0 Max Unit V 1. ℃/W Advanced Analog Technology, Inc. AAT1203 Note 2：Design targets only. Not tested in production. Note 3：Please refer to "Thermal Information" Block Diagram – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 4 of 16 0 V 1. Advanced Analog Technology, Inc. AAT1203 VCC50 VSB50 3.3V + + - - VCC50 Detector AUX33 Control 3.3V VSB50 Detector Low on Resistance OUT33 GND GND GND Over Temperature Protection GND – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 5 of 16 0 V 1. Advanced Analog Technology, Inc. AAT1203 Typical Characteristics Fig. 1. 3.3V VCC50 Cold Start Fig. 2. 3.3V VUX33 Cold Start – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 6 of 16 0 V 1. Advanced Analog Technology, Inc. AAT1203 Typical Characteristics Fig. 3. Fig. 4. 3.3V VCC50 Power Up (VSB50=5V) 3.3V VCC50 Power Up (AUX33=3.3V) – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 7 of 16 0 V 1. Advanced Analog Technology, Inc. AAT1203 Typical Characteristics Fig. 5. 3.3V VSB50 Power Up (AUX33=3.3V) Fig. 6. 3.3V VCC50 Power Down (VSB=5V) – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 8 of 16 0 V 1. Advanced Analog Technology, Inc. AAT1203 Typical Characteristics Fig. 7. 3.3V VCC50 Power Down (AUX33=3.3V) Fig. 8. 3.3V Load Transient Response Falling. – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 9 of 16 0 V 1. Advanced Analog Technology, Inc. AAT1203 Typical Characteristics Fig. 9. 3.3V Load Transient Response Rising – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 10 of 16 0 V 1. Advanced Analog Technology, Inc. AAT1203 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） This particular application uses the 8-pin SOIC 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－ TC ）/ RJA PJ＝（150－70）/70＝1.1W Worst case maximum power dissipation is determined by： Pd ＝（5.5－3.135）×0.25＝0.591W Normal operating maximum power dissipation is： Pd ＝（5－3.3）×0.25＝0.425W Note: The thermal characteristics of the AAT1203 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 11 of 16 0 V 1. Advanced Analog Technology, Inc. AAT1203 Thermal Information (Cont.) Power-W 1.78 0.591 0.425 25 108 120 150 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 Application Information 1 8 VSB50 GND VCC50 GND GND 4.7μF 0.1μF 2 4.7μF 0.1μF 3 7 AAT1203 OUT33 3.3V GND 6 GND GND 4.7μF 5 4 AUX33 4.7μF GND GND 0.1μF Typical Application Schematic – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 12 of 16 V 1.0 Advanced Analog Technology, Inc. AAT1203 Package Dimension 8-Pin SOP θ SYMBOLS DIMENSIONS IN MILLIMETERS DEMINSIONS IN INCHES MIN TYP MAX 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 13 of 16 V 1.0 Advanced Analog Technology, Inc. AAT1203 Tape and Reel 8-Pin SOP – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 14 of 16 V 1.0 Advanced Analog Technology, Inc. AAT1203 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 THE 6. CARRIER. POCKET POSITION RELATIVE TO SPROCKET HOLE IS MEASURED AS TRUE POSITION OF POCKET, NOT POCKET HOLE. Part Marking SOP8 Top Marking SOP8 Back Marking – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 15 of 16 V 1.0 Advanced Analog Technology, Inc. AAT1203 Ordering Information – 台灣類比科技股份有限公司 – – Advanced Analog Technology, Inc. – Page 16 of 16 V 1.0