AX1117A
1A Low Dropout Linear Regulator
GENERAL DESCRIPTION
AX1117A is a low dropout positive adjustable or fixed-mode regulator with minimum of
1A output current capability. The product is specifically designed to provide well-regulated
supply for low voltage IC applications such as high-speed bus termination and low current
3.3V logic supply. AX1117A is also well suited for other applications such as VGA cards.
AX1117A is guaranteed to have lower than 1.4V dropout at full load current making it ideal to
provide well-regulated outputs of 1.25 to 5.0 with 6.4V to 12V input supply.
FEATURES
-
1.5V maximum dropout at full load current
Fast transient response
Output current limiting
Built-in thermal shutdown
Good noise rejection
Low-ESR Ceramic Capacitor (MLCC) Required for Stability.
3-Terminal Adjustable or Fixed 1.5V, 1.8V, 2.5V, 3.3V, 5.0V
Packages: SOT223, TO252.
BLOCK DIAGRAM
Vin
3
2
Vout
+
+
-
1.25V
+
CURRENT
LIMIT
1
GND
(FIXED)
+
Thermal
Shutdown
-
1
Adj
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.0 Dec.18, 2012
AX1117A
PIN ASSIGNMENT
The packages of AX1117A are SOT223 and TO252; the pin assignment is given by:
SOT223
( Top View )
Name
3
VIN
2
VOUT
1
Adj (GND)
A resistor divider from this pin to the VOUT
Adj
pin and ground sets the output voltage.
(GND)
(Ground only for Fixed-Mode)
The output of the regulator. A minimum of
3.3uF EL capacitor (10mΩ ≤ ESR ≤ 1Ω)
VOUT
must be connected from this pin to ground
to insure stability.(Note)
The input pin of regulator. Typically a large
storage capacitor is connected from this pin
to ground to insure that the input voltage
does not sag below the minimum dropout
VIN
voltage during the load transient response.
This pin must always be 1.5V higher than
VOUT in order for the device to regulate
properly. (Note)
Tab is VOUT
TO252
( Top View )
3
2
VIN
VOUT
Adj (GND)
1
Description
Tab is VOUT
Note: To prevent oscillation, a 4.7uF minimum Y5V or a 1uF minimum X7R or X5R dielectric is strongly
recommended if ceramics are used as input/output capacitors.
ORDER/MARKING INFORMATION
Order Information
AX 1117A X XX X
Low Dropout
Regulator
Package
VOUT
E : SOT223-3L Blank : ADJ
D : TO252-3L 15 : 1.5V
18 : 1.8V
25 : 2.5V
33 : 3.3V
50 : 5.0V
Top Marking (SOT223-3L)
ADJ
Logo
Packing
Blank : Tube
A : Taping
Top Marking (TO252-3L)
ADJ
AX 1 1 1 A7
Y W WX
Part number
Functional code
ID code: internal
WW: 01~52
Year: A=2010
1=2011
2=2012
:
:
9=2019
FIX
Y WWX
AX 1 1 1 A7
Y Y W WX
Part number
Functional code
ID code: internal
WW: 01~52
Year: A=2010
1=2011
2=2012
:
:
9=2019
FIX
AX 1A 1- V1 V7
AX A1 1- V1 V7
Output Voltage
AX1117A-15: 1.5V
AX1117A-18: 1.8V
AX1117A-25: 2.5V
AX1117A-33: 3.3V
AX1117A-50: 5.0V
Logo
ID code: internal
WW: 01~52
Year: A=2010
1=2011
2=2012
:
:
9=2019
Output Voltage
AX1117A-15: 1.5V
AX1117A-18: 1.8V
AX1117A-25: 2.5V
AX1117A-33: 3.3V
AX1117A-50: 5.0V
Y Y WW X
ID code: internal
WW: 01~52
Year: A=2010
1=2011
2=2012
:
:
9=2019
2/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.0 Dec.18, 2012
AX1117A
ABSOLUTE MAXIMUM RATINGS
Parameter
DC Supply Voltage
Operating Junction Temperature Range
Maximum junction Temperature
Power Dissipation(No heat sink ;No air flow)
TA=25°C, TJ=125°C
Storage Temperature
Symbol
Vin
TOP
TMJ
SOT-223
TO-252
PD
TST
ELECTRICAL CHARACTERISTICS
(TA=25°C, Under Operating Conditions)
Characteristics
Conditions
Min
Operation Input
2.75
Voltage
TJ=25°C,
(VIN-OUT)
Reference Voltage AX1117A-ADJ
=1.5V
1.225
IOUT =10mA
IOUT = 10mA, TJ =
AX1117A-1.5
25°C,
1.470
3V≦VIN≦12V
IOUT = 10mA, TJ =
AX1117A-1.8
25°C,
1.764
3.3V≦VIN≦12V
IOUT = 10mA, TJ =
Output Voltage
AX1117A-2.5
25°C,
2.450
4V≦VIN≦12V
IOUT = 10mA, TJ =
AX1117A-3.3
25°C,
3.235
4.8V≦VIN≦12V
IOUT = 10mA, TJ =
AX1117A-5.0
25°C,
4.900
6.5V≦VIN≦12V
IOUT =10mA,
Line Regulation
AX1117A-XXX
VOUT+1.5V
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