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)
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.
Applications
•
•
PC peripheral
Communication
Ordering Information
AP 1120 S X L - 13
Package
S : SOP-8L
Vout
Blank : CH1=3.3V
CH2=2.5V
B : CH1=3.3V
CH2=1.8V
Packaging
(Note 2)
SOP-8L
Lead Free
L : Lead Free
Packing
13 : Tape & Reel
Device
Lead-free
AP1120SXL-13
Notes:
Package
Code
S
13” Tape and Reel
Quantity
Part Number Suffix
2500/Tape & Reel
-13
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.
AP1120 Rev. 2
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Diodes Incorporated
AP1120
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
Pin Assignments
( Top View )
GND1
VIN 1
GND 2
VIN 2
1
2
8
7
3.3V
3.3V
2.5V (1.8V)
2.5V (1.8V)
AP1120
3
4
6
5
SOP-8L
Pin Descriptions
Pin Name
GND1/2
3.3V (Vout1)
2.5V/1.8V
(Vout2)
VIN1/2
Ground
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.
Description
The input pin of regulator. Typically a large storage capacitor (0.15Ω
≤
ESR
≤
20Ω) is
connected from this pin to ground.
AP1120 Rev. 2
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Diodes Incorporated
AP1120
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
Block Diagram
2
Vin 1
+
+
1.25V
CURRENT
LIMIT
+
Thermal
Shutdown
4
Vin 2
+
+
1.25V
CURRENT
LIMIT
+
Thermal
Shutdown
+
+
7,8
Vout 1
Typical Circuit
5V
C1
100uF
GND1 3.3V
Vin1
3.3V
GND2 2.5V
Vin2
2.5V
C2
100uF
(3.3V/2.5V Dual output )
AP1120 Rev. 2
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-
-
-
-
1
GND 1
5,6
Vout 2
3
GND 2
3.3V/1A
2.5V/1A
C3
100uF
FEBRUARY 2009
©
Diodes Incorporated
AP1120
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
Absolute Maximum Ratings
Symbol
V
IN
P
D
T
ST
T
OP
Parameter
DC Supply Voltage
Power Dissipation
Storage Temperature
Operating Junction Temperature Range
Rating
-0.3 to 18 V
Internally Limited
-65 to +150
0 to +150
o
o
Unit
V
C
C
Electrical Characteristics
(Under Operating Conditions)
Parameter
Conditions
I
OUT
= 10mA, T
A
= 25
o
C,
AP1120(B) - V
OUT1
4.8V
≦
V
IN
≦
12V
I
OUT
= 10mA, T
A
= 25
o
C,
AP1120 - V
OUT2
4V
≦
V
IN
≦
12V
I
OUT
= 10mA, T
A
= 25
o
C,
AP1120B - V
OUT2
4V
≦
V
IN
≦
12V
I
O
=10mA,V
OUT
+1.5V<V
IN
<12V, T
A
=25
o
C
V
IN
= 5V, 0
≦
I
OUT
≦
1A,
AP1120 series
V
OUT1
T
A
=25
o
C (Note 3, 4)
AP1120 series
V
IN
=4V, 0mA<Io<1A,
V
OUT2
T
A
=25
o
C (Note 3, 4)
I
OUT
= 1A,ΔV
OUT
=0.1%V
OUT
1. 1
5
0.008
60
0.5
50
45
10
0.04
70
Min
3.235
2.450
1.764
Typ.
3.300
2.500
1.800
Max
3.365
2.550
1.836
0.2
26
20
1.3
33
25
1.4
Unit
V
V
V
%
mV
mV
V
A
mA
%/W
dB
%
O
Output Voltage
Line Regulation
Load Regulation
Dropout Voltage
(V
IN
-V
OUT
)
Current Limit
Minimum Load Current
Thermal Regulation
Ripple Rejection
Temperature Stability
(V
IN
-V
OUT
) = 5V
0
o
C
≦
Tj
≦
125
o
C (Note 5)
T
A
=25
o
C, 30ms pulse
F=120Hz,C
OUT
=25uF Tantalum, I
OUT
=1A
I
O
=10mA
θ
JA
Thermal Resistance SOP-8L: Control Circuitry/Power Transistor
(Note 6)
Junction-to-Ambient (No CH1 or CH2 only
heat sink; No air flow)
CH1 & CH2 and PD1=PD2
SOP-8L: Control Circuitry/Power Transistor
θ
JC
Thermal Resistance (Note 6)
CH1 or CH2 only
Junction-to-Case
CH1 & CH2 and PD1=PD2
C/W
20
12
O
C/W
Notes:
3. 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.
4. Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by
the input/output differentially and the output current. Guaranteed maximum power dissipation will not be available over the
full input/output range.
5. Quiescent current is defined as the minimum output current that requires maintaining regulation. At 12V input/output
differential the device is guaranteed to regulate if the output current is greater than 10mA.
6. Vout1 and Vout2 are connected to the PCB copper area 5.5mm*5.5mm separately. If you need large PD or lower Tc & Tj,
please connect to the large copper area >> 5.5mm*5.5mm (like 10mm*10mm).
AP1120 Rev. 2
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Diodes Incorporated
AP1120
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
Typical Performance Characteristics
2. 0
1. 8
0.20
Output Voltage Deviation (%)
1. 6
0
I load=800mA
Dropout Voltage (V)
1. 4
1. 2
1. 0
0. 8
0. 6
0. 4
0. 2
0
0
250
500
750
1000
Tj = 125
o
C
Tj = 25
o
C
-0.20
-0.40
-0.80
-1
-25
0
Dropout Voltage vs Output Current
2
1.5
0.8
1
Output Current (mA)
Temperature (
o
C)
25
50
75
100
125
Load Regulation vs Temperature
Output Voltage Change (%)
1
0. 5
0
-0.5
-1
-1.5
-2
-50
-25
0
25
50
75
100
125
150
Output Voltage Deviation (%)
0.6
0.4
0.2
0
Percent Change in Output Voltage vs Temperature
Output Voltage Deviation (mV) Input Voltage (V)
Load Current (A) Output Voltage Deviation (mV)
7.5
6.5
5.5
40
20
0
-20
-40
Cin=1uF
Cout=10uF Tantalum
30
20
10
0
-10
-20
2
1
0
-1
0
10
20
Temperature ( C)
o
2
4
6
8
10
12
Line Regulation
C in = 1uF
C out = 10 uF Tantalum
Preload = 100mA
Input Voltage (V)
0
20
40
60
80
100 120 140 160 180 200
TIME (us)
30
40
50
60
70
80
90
100
TIME (us)
Line Transient Response
Load Transient Response
AP1120 Rev. 2
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Diodes Incorporated
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