AP1122
1A LOW DROPOUT POSITIVE REGULATOR
AP1122 Rev. 2 1 of 9 FEBRUARY 2007
www.diodes.com © Diodes Incorporated
Lead-free
• 1.3V maximum dropout at full load current
• Fixed 1.2V
±
2% output voltage
• Fast transient response
• Output current limiting
• Built-in thermal shutdown
• Good noise rejection
• Packages: SOT223-3L, TO252-3L, SOT89-3L
• SOT223-3L and TO252-3L: Available in “Green”
Molding Compound (No Br, Sb) (Note 1)
• Lead Free Finish/RoHS Compliant (Note 2)
AP1122 is a low dropout positive fixed-mode regulator with 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 1.2V logic supply.
AP1122 is also well suited for other applications such as VGA
cards. AP1122 is guaranteed to have lower than 1.3V dropout at
full load current making it ideal to provide well-regulated outputs
of 1.2 output voltage with 2.5V input voltage supply.
Applications
• PC peripheral
• Communication
Ordering Information
E : SOT223-3L
D : TO252-3L
Y : SOT89-3L
Package
L : Lead Free
A P 1 1 2 2 X X X
Lead Free
Packing
-U : Tube
-13 : Taping
G : Green (Note 1)
Note: 1. Green is only for SOT223-3L and TO252-3L.
2. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Note: 3. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf
.
Features
General Description
Tube/Bulk 13” Tape and Reel
Device
(Note 3)
Package
Code
Packaging
(Note 3)
Quantity Part Number
Suffix
Quantity Part Number
Suffix
AP1122E E SOT223-3L 75 -U 2500/Tape & Reel -13
AP1122D D TO252-3L 80 -U 2500/Tape & Reel -13
AP1122Y Y SOT89-3L NA NA 2500/Tape & Reel -13
AP1122
1A LOW DROPOUT POSITIVE REGULATOR
AP1122 Rev. 2 2 of 9 FEBRUARY 2007
www.diodes.com © Diodes Incorporated
Pin Assignment
(1) SOT223-3L (2) TO252-3L
Vin
Vout
GND
Tab is Vout
(Top View)
3
2
1
3
2
1
Vin
Vout
GND
Tab is Vout
(Top View)
(3) SOT89-3L
GND
Vout
Vin
1
3
2
Tab is Vout
Typical Application Circuit
C2
100uF
2.5V
1.2V/1A
Tab is Vout
Vin
Vout
GND
C1
100uF
AP1122
1A LOW DROPOUT POSITIVE REGULATOR
AP1122 Rev. 2 3 of 9 FEBRUARY 2007
www.diodes.com © Diodes Incorporated
Block Diagram
3
Thermal
Shutdown
1
2 Vout
GND
1.2V
+
+
CURRENT
LIMIT
Vin
+
+
Pin Descriptions
NAME I/O PIN # FUNCTION
GND I 1 Ground Pin
Vout O 2
The output of the regulator. A minimum of 10uF capacitor (0.15Ω ≤ ESR ≤ 20Ω) must
be connected from this pin to ground to insure stability.
Vin I 3
The input pin of regulator. Typically a large storage capacitor (0.15Ω ≤ ESR ≤ 20Ω) is
connected from this pin to ground to insure that the input voltage does not sag below
the minimum dropout voltage during the load transient response. This pin must
always be 1.3V higher than Vout in order for the device to regulate properly.
Absolute Maximum Ratings
Symbol Parameter Rating Unit
Vin DC Supply Voltage -0.3 to 12 V
T
ST
Storage Temperature -65 to +150
o
C
T
OP
Operating Junction Temperature Range 0 to +125
o
C
T
M
Maximum Junction Temperature 150
o
C
