AAT AAT1201-S 250-ma multi-input low-dropout regulator with dual-output power management Datasheet

Advanced Analog Technology, Inc.
AAT1201
Details are subject to change without notice
250-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
250-mA Load Current Capability with
VCC50 or 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 AAT1201 is a multi-input low-dropout
regulator (LDO) designed for LAN card. It
provides dual constant output supply 3.3V & 2.5V
at the output capable of driving a 250-mA load.
The output (OUT25) can be disabled by
connecting EN25 pin to GND.
The AAT1201 provides 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 LDO regulator for
either VCC50 or VSB50 inputs, and a
low-resistance bypass switch for the AUX33
input.
The AAT1201 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 & 2.5-V output. The device is
equipped with an incorporated reverse-blocking
scheme to prevent excess leakage from the input
terminals in the event when 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 )
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AAT1201
Function Table
INPUT VOLTAGE STATUS
(V)
INPUT SELECTED
EN25 VCC50 VSB50 AUX33 VCC50/VSB50/AUX33
Hi
Lo
Hi
Lo
Hi
Lo
Hi
Lo
Hi
Lo
Hi
Lo
Hi
Lo
Hi
Lo
0
0
0
0
0
0
0
0
5
5
5
5
5
5
5.0
5.0
0
0
0
0
5
5
5.0
5.0
0
0
0
0
5
5
5.0
5.0
0
0
3.3
3.3
0
0
3.3
3.3
0
0
3.3
3.3
0
0
3.3
3.3
None
None
AUX33
AUX33
VSB50
VSB50
VSB50
VSB50
VCC50
VCC50
VCC50
VCC50
VCC50
VCC50
VCC50
VCC50
OUTPUT(V)
OUTPUT
(I)(mA)
OUT33
OUT25
Iout33+Iout25
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
0
0
2.5
0
2.5
0
2.5
0
2.5
0
2.5
0
2.5
0
2.5
0
0
0
250
250
250
250
250
250
250
250
250
250
250
250
250
250
Pin Description
TERMINAL 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
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AAT1201
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 ~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 Free-Air 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
Operating Free-Air 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
250
0
-
70
µF
mA
℃
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AAT1201
Electrical Characteristics Over Recommended Operating Free-Air Temperature, TC =
0℃ to 70℃, C L = 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 = 250mA
3.135
3.300
3.465
V
I out 33 =0, I out 25 = 200mA
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<IL<250 mA
-
40
-
mV
Quiescent Supply Current
I 50
From VCC50 VSB50 Terminals,
I L = 0 to 250mA
-
1.0
3.0
mA
From AUX33 Terminal, I L = 0A
-
1.0
3.0
mA
0.25
-
-
0.2
-
-
-
-
1.5
I AUX
Out33 Load Current
I L33
Out25 Load Current
I L 25
Out33 or Out25 Output Shortened to
0V
A
Output Current Limit
I LIMIT
Thermal Shutdown
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
-
(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
℃
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
Note 2:Design targets only. Not tested in production.
Note 3:Please refer to "Thermal Information"
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℃/W
Advanced Analog Technology, Inc.
AAT1201
Block Diagram
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AAT1201
Typical Characteristics
Fig. 1. 3.3V VCC50 Cold Start
Fig. 2. 2.5V VCC50 Cold Start
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AAT1201
Typical Characteristics
Fig. 3. 3.3V AUX33 Cold Start
Fig. 4. 2.5V AUX33 Cold Start
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AAT1201
Typical Characteristics
Fig. 5. 3.3V VCC50 Power Up (VSB50=5V)
Fig. 6.
2.5V VCC50 Power Up (VSB50=5V)
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AAT1201
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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AAT1201
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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AAT1201
Typical Characteristics
Fig. 11. 3.3V VCC50 Power Down (VSB=5V)
Fig. 12. 2.5V VCC50 Power Down (VSB=5V)
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AAT1201
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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AAT1201
Typical Characteristics
Fig.
15.
Fig. 16.
3.3V Load Transient Response Falling.
2.5V Load Transient Response Falling.
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AAT1201
Typical Characteristics
Fig.
17.
3.3V Load Transient Response Rising
Fig.
18.
2.5V Load Transient Response Rising
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AAT1201
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 style 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 SO 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=(5.5-2.375)×0.25=0.781W
Normal operating maximum power dissipation is:
Pd=(5-2.5)×0.25=0.625W
Note: The thermal characteristics of the AAT1201 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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AAT1201
Thermal Information
Power-W
1.78
0.781
0.625
25
95
106
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
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AAT1201
Application Information
1
4.7μ F
8
4.7μ F
GND
VCC50
GND
0.1μ F
2
3.3V
VSB50
0.1μ F
AAT1201
3
OUT33
EN25
AUX33
OUT25
7
6
to OUT33 or
Floating
4.7μ F
5
4
4.7μ F
2.5V
0.1μ F
4.7μ 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
AAT1201
OUT33
EN25
AUX33
OUT25
7
6
GND
4.7μF
4
4.7μF
5
0.1μF
GND or
FLOATIN
Typical Application Schematic - Only OUT33 Used
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AAT1201
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
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AAT1201
Tape and Reel
8-Pin SOP
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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
AAT1201
XXXXXX
SOP8 Back Marking
YYWW
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Ordering Information
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