AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
General Description
Features
•
•
•
•
•
•
•
1.3V maximum dropout at full load current
Fast transient response
Output current limiting for each channel
Built-in thermal shutdown for each channel
Good noise rejection
Dual output ch1 = 3.3V, ch2 = 2.5V
(ch2 = 1.8V for version B)
SOP-8L: Available in “Green” Molding Compound
(No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 1)
AP1121 is a low dropout positive regulator which provides 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. AP1121 is 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 1121 X S X - 13
Vout
Package
Lead Free
A : CH1=3.3V
CH2=2.5V
B : CH1=3.3V
CH2=1.8V
S : SOP-8L
L : Lead Free
G : Green
Device
Lead-free
AP1121XSL-13
AP1121XSG-13
Notes:
Package
Code
S
S
Packaging
(Note 2)
SOP-8L
SOP-8L
Packing
13 : Tape & Reel
13” Tape and Reel
Quantity
Part Number Suffix
2500/Tape & Reel
-13
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.
AP1121 Rev. 5
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AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
Pin Assignments
( Top View )
VOUT1 1
8
GND
VIN1 2
7
GND
6
GND
5
GND
VIN2 3
AP1121
VOUT2 4
SOP-8L
Pin Descriptions
Pin Name
GND
3.3V(VOUT1)
2.5V/1.8V
(VOUT2)
VIN
AP1121 Rev. 5
Descriptions
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.
The input pin of regulator. Typically a large storage capacitor (0.15Ω ≤ ESR ≤ 20Ω) is
connected from this pin to ground.
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AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
Block Diagram
2
1
VIN1
VOUT1
-
+
+
1.25V
+
CURRENT
LIMIT
+
Thermal
Shutdown
-
5/6
GND
4
3
VOUT2
VIN2
-
+
+
1.25V
+
CURRENT
LIMIT
+
Thermal
Shutdown
-
7/8
GND
Typical Application Circuit
3.3V/1A
C1
100uF
V OUT1 GND
VIN1 GND
5V
C2
100uF 2.5V/1A
C3
100uF
VIN2
GND
V OUT2 GND
(3.3V/2.5V Dual output )
AP1121 Rev. 5
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AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
Absolute Maximum Ratings
Symbol
VIN
TST
Parameter
DC Supply Voltage
TOP
Operating Junction Temperature Range
TM
Maximum Junction Temperature
Parameter
Output Voltage
Line Regulation
Load Regulation
Dropout Voltage
(VIN-VOUT)
Current Limit
Minimum Load Current
Thermal Regulation
Ripple Rejection
Temperature Stability
V
-65 to +150
o
0 to +125
o
C
C
oC
150
(Under Operating Conditions)
Conditions
IOUT = 10mA, TA = 25oC,
AP1121_ - VOUT1
4.8V≤VIN≤12V
IOUT = 10mA, TA = 25oC,
AP1121A - VOUT2
4V≤VIN≤12V
IOUT = 10mA, TA = 25oC,
AP1121B - VOUT2
4V≤VIN≤12V
IO = 10mA, VOUT +1.5V<VIN<12V, TA = 25oC
AP1121 series
VIN = 5V, 0≤IOUT ≤1A,
VOUT1
TA = 25oC (Note 3, 4)
AP1121 series
VIN = 4V, 0mA<Io<1A,
VOUT2
TA = 25oC (Note 4, 5)
Min
Typ.
Max
Unit
3.235
3.300
3.365
V
2.450
2.500
2.550
V
1.764
1.800
1.836
V
0.2
%
26
33
mV
20
25
mV
1.3
1.4
V
5
0.008
60
0.5
10
0.04
70
A
mA
%/W
dB
%
IOUT = 1A, ΔVOUT = 0.1%VOUT
(VIN-VOUT) = 5V
0oC≤Tj≤125oC (Note 5)
TA = 25 oC, 30ms pulse
F = 120Hz, COUT = 25uF Tantalum, IOUT = 1A
IO = 10mA
Control Circuitry/Power Transistor
θ JA Thermal Resistance SOP-8L:
(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
Notes:
Unit
-0.3 to 18 V
Storage Temperature
Electrical Characteristics
Rating
1. 1
177
158
O
29
19
O
C/W
C/W
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).
AP1121 Rev. 5
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AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
Typical Performance Characteristics
0.20
2. 0
Output Voltage Deviation (%)
1. 8
1. 6
Dropout Voltage (V)
1. 4
1. 2
0
I load=800mA
-0.20
Tj = 25 oC
1. 0
-0.40
0. 8
Tj = 125 oC
0. 6
-0.80
0. 4
0. 2
0
0
250
750
500
-1
1000
Output Current (mA)
-25
Dropout Voltage vs Output Current
0
25
50
Temperature (oC)
75
100
125
Load Regulation vs Temperature
2
1
Output Voltage Deviation (%)
Output Voltage Change (%)
1.5
1
0. 5
0
-0.5
-1
-1.5
-2
-50
-25
0
25
50
Temperature (oC)
75
100
125
0.8
0.6
0.4
0.2
0
150
2
Cin=1uF
Cout=10uF Tantalum
6.5
5.5
40
20
0
-20
-40
0
20
40
60
80
100 120 140 160 180 200
TIME (us)
10
12
Line Regulation
30
C in = 1uF
C out = 10 uF Tantalum
Preload = 100mA
20
10
0
-10
-20
2
1
0
-1
Line Transient Response
AP1121 Rev. 5
8
Input Voltage (V)
Load Current (A) Output Voltage Deviation (mV)
Output Voltage Deviation (mV) Input Voltage (V)
7.5
6
4
Percent Change in Output Voltage vs Temperature
0
10
20
30
40
50
60
70
80
90
100
TIME (us)
Load Transient Response
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AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
Marking Information
(1) SOP-8L
( Top View )
5
8
A : 3.3V/2.5V version
B : 3.3V/1.8V version
YY : Year : 08, 09,10~
WW : Week : 01~52; 52
represents 52 and 53 week
X : Internal Code
L : Lead Free
G : Green
Logo
1
4
0.10/0.20
AP1121 X
YY WW X X
Part Number
0.62/0.82
Package Information
0.254
3.85/3.95
5.90/6.10
(1) Package type: SOP-8L
Gauge Plane
Seating Plane
Detail "A"
7°~9°
0.15/0.25
1.30/1.50
1.75max.
0.35max. 45°
7°~9°
Detail "A"
0°/8°
0.3/0.5
1.27typ
4.85/4.95
5.4
8x-0.60
8x-1.55
6x-1.27
Land Pattern Recommendation
(Unit: mm)
AP1121 Rev. 5
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AP1121
DUAL 1A LOW DROPOUT POSITIVE REGULATOR
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.
LIFE SUPPORT
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the
President of Diodes Incorporated.
AP1121 Rev. 5
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