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
+
+
-
CURRENT
LIMIT
1.25V
+
1
+
Thermal
Shutdown
GND
(FIXED)
-
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 )
3
2
1
Tab is V
OUT
TO252
( Top View )
3
2
1
Tab is V
OUT
V
IN
V
OUT
Adj (GND)
Name
V
IN
V
OUT
Adj (GND)
Description
A resistor divider from this pin to the V
OUT
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)
V
OUT
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
V
IN
voltage during the load transient response.
This pin must always be 1.5V higher than
V
OUT
in order for the device to regulate
properly.
(Note)
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
V
OUT
Packing
Blank : Tube
A : Taping
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
7
AX
1 1 1 A
Y W WX
Part number
Functional code
ID code: internal
WW: 01~52
Year: A=2010
1=2011
2=2012
:
:
9=2019
Top Marking (TO252-3L)
ADJ
Logo
7
AX
1 1 1 A
Y Y W WX
Part number
Functional code
ID code: internal
WW: 01~52
Year: A=2010
1=2011
2=2012
:
:
9=2019
FIX
Output Voltage
AX1117A-15: 1.5V
AX1117A-18: 1.8V
AX1117A-25: 2.5V
AX1117A-33: 3.3V
AX1117A-50: 5.0V
1 1 7
AX
A 1 V V
-
Y WWX
ID code: internal
WW: 01~52
Year: A=2010
1=2011
2=2012
:
:
9=2019
FIX
Output Voltage
AX1117A-15: 1.5V
AX1117A-18: 1.8V
AX1117A-25: 2.5V
AX1117A-33: 3.3V
AX1117A-50: 5.0V
1 7
AX
1 1 V V
A-
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)
T
A
=25°C, T
J
=125°C
Storage Temperature
Symbol
Vin
T
OP
T
MJ
SOT-223
TO-252
P
D
T
ST
Rating
Unit
-0.3 to 15
V
-40 to +125 °C
150
°C
850
mW
1050
-65 to +150 °C
ELECTRICAL CHARACTERISTICS
(T
A
=25°C, Under Operating Conditions)
Characteristics
Conditions
Min
Operation Input
2.75
Voltage
T
J
=25°C,
(V
IN
-
OUT
)
Reference Voltage AX1117A-ADJ
=1.5V
1.225
I
OUT
=10mA
I
OUT
= 10mA, T
J
=
AX1117A-1.5
25°C,
1.470
3V≦V
IN
≦12V
I
OUT
= 10mA, T
J
=
AX1117A-1.8
25°C,
1.764
3.3V≦V
IN
≦12V
I
OUT
= 10mA, T
J
=
Output Voltage
AX1117A-2.5
25°C,
2.450
4V≦V
IN
≦12V
I
OUT
= 10mA, T
J
=
AX1117A-3.3
25°C,
3.235
4.8V≦V
IN
≦12V
I
OUT
= 10mA, T
J
=
AX1117A-5.0
25°C,
4.900
6.5V≦V
IN
≦12V
I
OUT
=10mA,
Line Regulation
AX1117A-XXX
V
OUT
+1.5V<V
IN
<12V,
-
T
J
=25°C (Note 1,2)
V
IN
=3.3V,
AX1117A-ADJ
Vadj=10mA< I
OUT
<1A,
-
T
J
=25°C (Note 1,2)
V
IN
=3V, 10mA< I
OUT
Load Regulation
AX1117A-1.5
<1A,
-
T
J
=25°C (Note 1,2)
V
IN
=3.3V, 10mA< I
OUT
AX1117A-1.8
<1A,
-
T
J
=25°C (Note 1,2)
Typ
-
Max Units
12
V
V
V
V
V
V
V
%
%
mV
mV
1.250 1.275
1.500 1.530
1.800 1.836
2.500 2.550
3.300 3.365
5.000 5.100
0.2
0.4
12
15
0.5
1
15
18
3/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.0 Dec.18, 2012
AX1117A
V
IN
=4V, 10mA< I
OUT
AX1117A-2.5
<1A,
-
T
J
=25°C (Note 1,2)
V
IN
=
5V,
10
AX1117A-3.3
-
mA≦I
OUT
≦1A,
T
J
=25°C (Note 1,2)
V
IN
=
6.5V,
10
AX1117A-5.0
-
mA≦I
OUT
≦1A,
T
J
=25°C (Note 1,2)
I
OUT
=
AX1117A-ADJ
-
/1.5/1.8/2.5/3.3/5.0 1A ,V
OUT
=1%V
OUT
AX1117A-ADJ
(V
IN
-V
OUT
) = 3V
1. 1
/1.5/1.8/2.5/3.3/5.0
AX1117A-XXX
0°C≦Tj≦125°C
-
50
-
20
26
40
1.3
-
5
60
0.5
117
92
25
33
50
1.5
-
7
70
-
mV
mV
mV
V
A
mA
dB
%
Dropout Voltage
(V
IN
-V
OUT
)
Current Limit
Minimum Load
Current
Ripple Rejection
Temperature
Stability
JA
Thermal
Resistance
Junction-to-Ambient
(No heat sink ;No
air flow)
JC
Thermal
Resistance
Junction-to-Case
F=120Hz,C
OUT
=10μf ,4.7μf ,3.3μf
AX1117A-XXX
V
IN
=V
OUT
+3V
I
OUT
=10mA
SOT-223
TO-252
-
-
°C/W
SOT-223
TO-252
-
15
10
-
°C/W
Note1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load
regulation are measured at a constant junction temperature by low duty cycle pulse testing. Load
regulation is measured at the output lead = 1/18” from the package.
Note2: Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation
is determined by the difference between input and output differential and the output current. Guaranteed
maximum power dissipation will not be available over the full input/output range.
Note3: Quiescent current is defined as the minimum output current required in maintaining regulation. At 12V
input/output differential the device is guaranteed to regulate if the output current is greater than 10mA.
4/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.0 Dec.18, 2012
AX1117A
APPLICATION CIRCUIT
(1) Using Multilayer Ceramic Capacitor (MLCC)
Fixed Output
VIN=5V
3
U1
VIN
VOUT
2
VOUT=3.3V
VIN=5V
3
ADJ Output
U1
VIN
VOUT
2
VOUT=3.3V
R1
C1
3.3~10uF
AX1117A-33
GND
1
C2
3.3~10uF
C1
3.3~10uF
AX1117A-ADJ
R2
390
ADJ
1
240
C2
3.3~10uF
V
OUT
½
V
REF
(1
R
2
);
V
REF
½
1.250
V
R
1
(2) Using Aluminum Electrolytic Capacitor (AL)
Fixed Output
VIN=5V
3
U1
VIN
VOUT
2
VOUT=3.3V
VIN=5V
3
U1
VIN
VOUT
2
ADJ Output
VOUT=3.3V
R1
C1
3.3~10uF
AX1117A-33
GND
1
C2
0.1uF
C3
3.3~100uF
C1
3.3~10uF
AX1117A-ADJ
R2
390
ADJ
1
240
C2
0.1uF
C3
3.3~100uF
V
OUT
½
V
REF
(1
R
2
);
V
REF
½
1.250
V
R
1
5/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.0 Dec.18, 2012
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