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Advanced Analog Technology, Inc.
AAT1203
Details are subject to change without notice
250-mA MULTI-INPUT LOW-DROPOUT REGULATOR WITH VAUX SWITCH
Features Complete Power Management Automatic Input Voltage Selection Input Voltage Source Detector With Hysteresis 250-mA Load Current Capability With VCC50 or VSB50 or AUX33 Input Source Integrated Low rDS(on ) Switch Regulated Output 3.3V (fixed) Output Short Circuit Protection Pin Configuration
TO P VI E W
VSB50 1 2 3 4 8 7 6 5 GND GND GND GND
VCC50 O U T33 AUX33
( 8- P I N SO P )
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.
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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 VCC50/VSB50/AUX33 None AUX33 VSB50 VSB50 VCC50 VCC50 VCC50 VCC50 OUTPUT ] V^ ] 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 VSB50 VCC50 OUT33 AUX33 GND GND GND GND TERMINAL NO. 1 2 3 4 5 6 7 8 I/O I I O I I I I I 5V Standby Supply Input 5V Main Supply Input 3.3V Regulated Output 3.3V Auxiliary Supply Input Ground Ground Ground Ground DESCRIPTION
Absolute Maximum Ratingsq
* 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 ..............................................0J to +70J * Storage Temperature Range, Tstorage .................................................. - 45 to +125J * Operating Junction Temperature Range, TJ ............................................. - 5 to +130J * Lead Temperature ] Soldering for 10 seconds^ , T(LEAD) ............................260J
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AAT1203
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 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 F
Load Current, I L Ambient Temperature, TC
0 0
-
250 70
mA
J
Electrical Characteristics Over Recommended Operating Free-Air Temperature, TC = 0 to J70 , CL = J 4.7F (Unless Otherwise Specified)
Parameter
5V Inputs 3.3V Output Line Regulation Voltage
Load Regulation Voltage Quiescent Supply Current I AUX Out33 Load Current Output Current Limit Thermal Shutdown
(Note 2)
Symbol
VCC50 VSB50 OUT33
VO (VI ) VO (IO ) I 50 I AUX I L33 I LIMIT TTSD Thys CL I Ikg (REV ) VLO VHI R (SWITCH ) R JA
Test Condition
I out 33 = 250mA
VSB50 or VCC50 = 4.5V to 5.5V 20 mAO I L O 250 mA From VCC50 VSB50 terminals, I L = 0mA to 250mA From AUX33 terminal, I L = 0A Out33 Output short to 0V
Min
4.5 3.135
0.25 150 -
Typ
5.0 3.300
2 40 1.0 1.0 15 4.7 4.05 4.3 100 70
Max Unit
5.5 3.465
3.0 3.0 1.5 180
J
V V
mV mV mA mA A
Thermal Hysteresis (Note 2) Load Capacitance Reverse Leakage Output Current Threshold Voltage, Low Threshold Voltage, High Auxiliary Switch Resistance Thermal Impedance, Junction-to-Ambient (Note 3)
50 4.25 4.5 0.4 g F g A
Minimal ESR to insure stability of regulated output Tested for grounded input AUX33, VSB50 or VCC50 = GND, Out33 = 3.3V VSB50 or VCC50o VSB50 or VCC50o VSB50 = VCC50 = 0V, AUX33 = 3.3V, I L = 150mA Without copper for heat spreading With copper for heat spreading
3.85 4.1 -
V V
J /W
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AAT1203
Note 2G Design targets only. Not tested in production. Note 3G Please refer to "Thermal Information"
Block Diagram
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AAT1203
VCC50
VSB50
3.3V
+ -
+ -
3.3V
AUX33
VCC50 Detector
Control
VSB50 Detector
OUT33
Low on Resistance
GND Over Temperature Protection
GND
GND
GND
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AAT1203
Typical Characteristics
Fig. 1.
3.3V VCC50 Cold Start
Fig. 2.
3.3V VUX33 Cold Start
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AAT1203
Typical Characteristics
Fig. 3.
3.3V VCC50 Power Up (VSB50=5V)
Fig. 4.
3.3V VCC50 Power Up (AUX33=3.3V)
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AAT1203
Typical Characteristics
Fig. 5.
3.3V VSB50 Power Up (AUX33=3.3V)
Fig. 6.
3.3V VCC50 Power Down (VSB=5V)
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AAT1203
Typical Characteristics
Fig. 7.
3.3V VCC50 Power Down (AUX33=3.3V)
Fig. 8.
3.3V Load Transient Response Falling.
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AAT1203
Typical Characteristics
Fig. 9.
3.3V Load Transient Response Rising
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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 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 TC I PJ] RJC^I PJ] RCA^ TJx TC I 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 70J , and a maximum junction temperature of 150J is determined asG PJx] TJ TC ^ / RJA PJx] 150 70^ /70x 1.1W Worst case maximum power dissipation is determined byG Pd x] 5.5 3.135^ x0.25x 0.591W Normal operating maximum power dissipation isG Pd x] 5 3.3^ x0.25x 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.
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AAT1203
Thermal Information (Cont.)
1.78
Power-W
0.591 0.425
25
108
120
150
Ambient Temperature - X C
NOTE: These curves are to be used for guideline purposes only. F or a particular application, a more specijic thermal characterizis required. ation
Power Dissipation Derating Curves
Application Information
1 VSB50 4.7g F 0.1g F 2 4.7g F 0.1g F 3 3.3V 4.7g F 4 AUX33 4.7g F 0.1g F GND
8 GND
7 VCC50 GND GND
AAT1203
OUT33 GND
6 GND
5 GND GND
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AAT1203
Package Dimension
8-Pin SOP
SYMBOLS A A1 A2 b C D E E1 e L y
DIMENSIONS IN MILLIMETERS DEMINSIONS IN INCHES MIN 1.47 0.10 --0.33 0.19 4.80 5.80 3.80 --0.38 --0 TYP 1.60 --1.45 0.41 0.20 4.85 6.00 3.90 1.27 0.71 ----MAX 1.73 0.22 --0.51 0.25 4.95 6.20 4.00 --1.27 0.076 0 MIN 0.058 0.004 --0.013 0.0075 0.189 0.228 0.150 --0.015 --0 TYP 0.063 --0.057 0.016 0.008 0.191 0.236 0.154 0.050 0.028 ----MAX 0.068 0.008 --0.020 0.0098 0.195 0.244 0.157 --0.050 0 0
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AAT1203
Tape and Reel
8-Pin SOP
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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. 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
SOP8 Back Marking
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AAT1203
Ordering Information
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