Diodes AP1120 User Manual
AP1120
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
Features
• 1.3V maximum dropout at full load current
• Fast transient response
• Output current limiting for each channel
• Built-in thermal shutdown each channel
• Good noise rejection
• Dual output ch1=3.3V, ch2=2.5V
(1.8V for B version)
• Lead Free Package: SOP-8L
• Lead Free Finish/ RoHS Compliant (Note 1)
Applications
• PC peripheral
• Communication
Ordering Information
General Description
AP1120 series are low dropout positive regulator to provide
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/2.5V or
3.3V/1.8V logic supply. AP1120 series are guaranteed to have
<1.3V dropout at full load current making it ideal to provide well
regulated outputs dual channels with up to 18V input supply.
AP 1120 S X L - 13
Package
S : SOP-8L
Vout
Blank : CH1=3.3V
CH2=2.5V
Lead Free
L : Lead Free
Packing
13 : Tape & Reel
B : CH1=3.3V
CH2=1.8V
Device
AP1120SXL-13
Lead-free
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be on found our website at
http://www.diodes.com/datasheets/ap02001.pdf
Package
Code
S SOP-8L 2500/Tape & Reel -13
Packaging
(Note 2)
.
.
Quantity Part Number Suffix
AP1120 Rev. 2 1 of 7 FEBRUARY 2009
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13” Tape and Reel
Pin Assignments
( Top View )
AP1120
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
GND1
VIN 1
1
2
3.3V
8
3.3V
7
AP1120
2.5V (1.8V)
6
5
2.5V (1.8V)
GND 2
VIN 2
3
4
SOP-8L
Pin Descriptions
Pin Name Description
GND1/2 Ground
3.3V (Vout1)
2.5V/1.8V
(Vout2)
The output of the regulator. A minimum of 10uF c apacitor (0.15 Ω ≤ ESR ≤ 20Ω) must be
connected from this pin to ground to insure stability.
VIN1/2
AP1120 Rev. 2 2 of 7 FEBRUARY 2009
The input pin of regulator. Typically a large storage capacitor (0.15Ω ≤ ESR ≤ 20Ω) is
connected from this pin to ground.
www.diodes.com © Diodes Incorporated
Block Diagram
AP1120
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
Vin 1
Vin 2
Typical Circuit
2
4
Thermal
Shutdown
Thermal
Shutdown
7,8
Vout 1
+
-
+
CURRENT
LIMIT
+
-
+
CURRENT
LIMIT
1.25V
+
-
1.25V
+
-
+
1
GND 1
5,6
Vout 2
+
3
GND 2
GND1
3.3V
3.3V/1A
5V
C1
Vin1
GND2
3.3V
2.5V
2.5V/1A
100uF
Vin2
2.5V
C2
100uF
C3
100uF
(3.3V/2.5V Dual output )
AP1120 Rev. 2 3 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
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