Document
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
z Complete Power Management
Description
The AAT1205 is a multi-input low-dropout z Automatic Input Voltage Selection regulator (LDO) specially designed for LAN cards. It provides advanced dual constant output supply z Input Voltage Source Detector With Hysteresis 3.3V & 2.5V at the output capable of driving a z 400-mA Load Current Capability With 400-mA load. The output (OUT25) can be VCC50¡B VSB50 or AUX33 Input Source disabled by connecting EN25 pin to GND. z Integrated Low rDS(on ) Switch The AAT1205 is equipped with dual regulated power output for systems with multiple input z Dual Regulated Output 3.3V¡] fixed¡^ & 2.5V sources and require dual constant voltage source ¡] fixed¡^ with a low-dropout voltage. This is an intelligent www.DataSheet4U.com z Output Short Circuit Protection (SCP) power source selection device with a low-dropout regulator for either VCC50 or VSB50 inputs, and Pin Configuration a low-resistance bypass switch for the AUX33 input. TOP VIEW The AAT1205 allows transitions to progress VSB50 GND 8 1 smoothly from one input supply to another without generating a glitch outside of the specified range 2 GND 7 VCC50 of 3.3V & 2.5V output. Furthermore, this device OUT33 3 EN25 6 has an incorporated reverse-blocking scheme to OUT25 4 5 AUX33 prevent excessive leakage from the input terminals in the event that the output voltage is greater than ( 8-PIN SOP ) the input voltage. The input voltage is prioritized in the following order: VCC50, VSB50, AUX33.
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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 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 INPUT SELECTED 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 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 Description
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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 J 70 ¢ J • Storage Temperature Range, Tstorage …………….…………….…………………….. − 45 ¢J to +125¢J • Operating Junction Temperature Range, TJ …………….………………...……........ − 5 ¢J to +130¢J • Lead Temperature ¡] Soldering for 10 seconds¡^ , T(LEAD) ………………….……….260¢J
Note 1¡G 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 4.5 3.0 Typ Max 5.5 5.5 3.6 Unit V V V
µF
4.23 4.70 5.17 0 400 0 70
mA
¢J
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Advanced Analog Technology, Inc.
AAT1205
Electrical Characteristics Over Recommended Operating Free-Air Temperature, J , ¢ CL = 4.7µF J (unless otherwise specified) TC = 0¢ to 70
Parameter
5V Inputs 3.3V Output 2.5V Output Line Regulation Voltage
Load Regulation Voltage Quiescent Supply Current I AUX Out33 Load Current Out25 Load Current Output Current Limit Thermal Shutdown (Note 2) Thermal Hysteresis (Note 2) Load Capacitance Reverse Leakage Output Current Threshold Voltage, Low Threshold Voltage, High Auxiliary Switch Resistance
Symbol
VCC50 VSB50 OUT33 OUT25 ∆VO (∆VI )
∆VO (∆IO ) I 50 I AUX I L33 I L 25 I LIMIT TTSD Thys CL I Ikg (REV ) VLO VHI R SWITCH R θJA
Test Condition
Min
4.5
Typ
5.0 3.300 2.500
2 40 1.0 1.0 15 4.7 4.2 4.45 80 50
Max
5.5 3.465 2.625
3.0 3.0 1.5 180 50 4.4 4.65 0.4 -
Unit
V V V
mV mV mA mA
I out 33 + I out 25 = 400mA I out 33 =0, I out 25 = 300mA
VSB50 or VCC50 = 4.5V to 5.5V 20 mA¡Õ I L ¡Õ 250 mA From VCC50 VSB50 terminals.