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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
Complete Power Management Automatic Input Voltage Selection Input Voltage Source Detector With Hysteresis 400-mA Load Current Capability With VCC50B VSB50 or AUX33 Input Source Integrated Low rDS(on ) Switch Dual Regulated Output 3.3V] ] fixed^ fixed^ & 2.5V
Description
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.
Output Short Circuit Protection (SCP)
Pin Configuration
TOP VIEW
VSB50 VCC50 OUT33 AUX33 1 2 3 4 8 7 6 5 GND GND EN25 OUT25
( 8-PIN SOP )
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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 +125J * Operating Junction Temperature Range, TJ ................................................... - 5 J to +130J * Lead Temperature ] Soldering for 10 seconds^ , T(LEAD) ................................260J
Note 1G 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
F
4.23 4.70 5.17 0 400 0 70
mA
J
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AAT1205
Electrical Characteristics Over Recommended Operating Free-Air Temperature, J J TC = 0 to 70 , CL = 4.7F (unless otherwise specified)
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 JA
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 mAO I L O 250 mA From VCC50 VSB50 terminals, I L = 0 to 400mA From AUX33 terminal, I L = 0A
3.135 2.375
0.4 0.3
Out33 or Out25 output shorted to 0V
A
150 -
J
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
4.0 4.25 -
F A V V
J /
W
Note 2G Design targets only. Not tested in production. Note 3G Please refer to "Thermal Information"
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AAT1205
Function Block
VCC50
VSB50
3.3V
+ -
+ -
3.3V
VCC50 Detector
Control
VSB50 Detector
OUT33
AUX33
Low on Resistance
EN25 + OUT25
GND
Over Temperature Protection
2.5V
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AAT1205
Typical Characteristics
Fig. 1. 3.3V VCC50 Cold Start
Fig. 2. 2.5V VCC50 Cold Start
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AAT1205
Typical Characteristics
Fig. 3. 3.3V AUX33 Cold Start
Fig. 4. 2.5V AUX33 Cold Start
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AAT1205
Typical Characteristics
Fig. 5. 3.3V VCC50 Power Up (VSB50=5V)
Fig. 6.
2.5V VCC50 Power Up (VSB50=5V)
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AAT1205
Typical Characteristics
Fig. 7. 3.3V VCC50 Power Up (AUX33=3.3V)
Fig. 8. 2.5V VCC50 Power Up (AUX33=3.3V)
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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)
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AAT1205
Typical Characteristics
Fig.11. 3.3V VCC50 Power Down (VSB=5V)
Fig. 12. 2.5V VCC50 Power Down (VSB=5V)
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AAT1205
Typical Characteristics
Fig. 13. 3.3V VCC50 Power Down (AUX33=3.3V)
Fig. 14. 2.5V VCC50 Power Down (AUX33=3.3V)
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AAT1205
Typical Characteristics
Fig. 15.
3.3V Load Transient Response Falling
Fig. 16.
2.5V Load Transient Response Falling
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AAT1205
Typical Characteristics
Fig. 17.
3.3V Load Transient Response Rising
Fig. 18.
2.5V Load Transient Response Rising
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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 byG RJAx RJCI 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 equationG TJx TCI PJ] RJC^I TJx TCI PJ] RJA^ PJ] RCA^
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 JA is 50J /W. Hence, the maximum power dissipation allowable for an operating ambient temperature of 70 , and a maximum junction temperature of 150 is J determined asG PJx] PJx] TJ TC^ / RJA 150 70^ /50x 1.6W
Worst case maximum power dissipation is determined byG Pdx] 5.5 2.375^ x0.3+(5.5-3.135) x0.1x 0.0.9375+0.2365=1.174W
Normal operating maximum power dissipation isG Pdx] 5 2.5^ x0.3+(5-3.3) x0.1x 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.
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AAT1205
Thermal Information (Cont.)
2.5
Power-W
1.174 0.92
25
91
104
150
Ambient Temperature - X 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
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Advanced Analog Technology, Inc.
AAT1205
Application Information
1 VSB50 4.7g F 0.1g F 2 4.7g F 0.1g F 3 4.7g F 4 4.7g F 0.1g F VCC50 GND GND
8
7
3.3V
AAT1205
OUT33 EN25
6
TO OUT33 or FLOATING 2.5V 4.7g F
5 AUX33 OUT25
Typical Application Schematic - Dual Output
1 4.7g F 0.1g F 2 4.7g F 0.1g F 3 3.3V 4.7g F 4 4.7g F 0.1g F
VSB50
GND
8
GND or FLOATIN
VCC50
GND
7
AAT1205
OUT33 EN25
6 GND
AUX33
OUT25
5
GND or FLOATIN
Typical Application Schematic - Only OUT33 Used
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AAT1205
Package Dimension
8-PIN SOP
SYMBOL S
A A1 A2 b C D E E1 e L y
DIMENSIONS IN MIN TYP MAX
1.47 0.10 --0.33 0.19 4.80 5.80 3.80 --0.38 --0 1.60 --1.45 0.41 0.20 4.85 6.00 3.90 1.27 0.71 ----1.73 0.22 --0.51 0.25 4.95 6.20 4.00 --1.27 0.076 0
DEMINSIONS IN MIN TYP MAX
0.058 0.004 --0.013 0.0075 0.189 0.228 0.150 --0.015 --0 0.063 --0.057 0.016 0.008 0.191 0.236 0.154 0.050 0.028 ----0.068 0.008 --0.020 0.0098 0.195 0.244 0.157 --0.050 0 0
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AAT1205
Tape and Reel
8-Pin SOP
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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. 6.
K 0 IS MEASURED FROM A PLANE ON THE INSIDE BOTTOM OF THE POCKET TO THE TOP SURFACE OF
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
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AAT1205
Ordering Information
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