1A Low Dropout Positive Regulator
AP1122
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.1 Feb 15, 2005
1/10
Features
- 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
- Pb-Free Packages: SOT223, TO263, TO252,
TO220, SOT89
Applications
- PC peripheral
- Communication
General Description
AP1122 is a low dropout positive 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 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.
Ordering Information
A
P1122
X
X
Low Dropout Regulator
Package
E : SOT223-3L
K : TO263-3L
D : TO252-3L
T : TO220-3L
Y : SOT89-3L
Packing
Blank : Tube
A : Taping
Typical Circuit
C2
100uF
2.5V
1.2V/1A
Tab is Vout
Vin
Vout
GND
C1
100uF
1A Low Dropout Positive Regulator
AP1122
Anachip Corp.
www.anachip.com.tw Rev.1.1 Feb 15, 2005
2/10
Connection Diagram
3 PIN SOT223 3 PIN TO252 / TO263
3 PIN TO220
Vin
Vout
GND
Tab is Vout
( Top View )
3
2
1
Vin
Vout
GND
Tab is Vout
Tab is Vout
Vin
Vout
GND
( Top View )
3 PIN SOT89
GND
Vout
Vin
3
2
1
1
3
2
Tab is Vout
3
2
1
Block Diagram
3
Thermal
Shutdown 1
2Vout
GND
1.2V
+
+
CURRENT
LIMIT
Vin
-
+-
+
1A Low Dropout Positive Regulator
AP1122
Anachip Corp.
www.anachip.com.tw Rev.1.1 Feb 15, 2005
3/10
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
PD Power Dissipation Internally Limited
TST Storage Temperature -65 to +150 oC
TOP Operating Junction Temperature Range 0 to +150 oC
Electrical Characteristics (Under Operating Conditions)
PARAMETER CONDITIONS MIN TYP MAX UNIT
Output Voltage 2.5V≦VIN≦12V, TJ=25oC 1.176 1.2 1.224 V
Line Regulation IO=10mA, 2.5V<VIN<12V, TJ=25oC 0.2 %
Load Regulation VIN=2.5V~12V,Vadj=0,0mA<Io<1A, TJ=25oC
(Note 1,2) 1 %
Dropout Voltage
(VIN-VOUT) IOUT = 1A ,∆VOUT=0.1%VOUT 1.3 1.4 V
Current Limit (VIN-VOUT) = 5V 1. 1 A
Minimum Load
Current 0oC≦Tj≦125oC 5 10 mA
Thermal Regulation TA=25oC, 30ms pulse 0.008 0.04 %/W
Ripple Rejection F=120Hz,COUT=25uF Tantalum, IOUT=1A,
VIN=VOUT+3V 60 70 dB
Temperature Stability IO=10mA 0.5 %
JA
θ
Thermal
Resistance Junction-
to-Ambient (No heat
sink ;No air flow)
SOT89
SOT-223
TO-252
TO-220/263
300
117
92
85
oC/W
JC
θ
Thermal
Resistance
Junction-to-Case
SOT89 : Control Circuitry/Power Transistor
SOT-223 : Control Circuitry/Power Transistor
TO-263 : Control Circuitry/Power Transistor
TO-252 : Control Circuitry/Power Transistor
TO-220 : Control Circuitry/Power Transistor
100
15
0.65/2.7
10
0.65/2.7
oC/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.
1A Low Dropout Positive Regulator
AP1122
Anachip Corp.
www.anachip.com.tw Rev.1.1 Feb 15, 2005
4/10
Typical Performance Characteristics
Temperature (
o
C)
Percent Change in Output Voltage vs Temperature
Output Voltage Change (%)
-50 -25 0 25 50 75 100 125 150
- 2
-1.5
- 1
-0.5
0
0. 5
1
1.5
2
Input Voltage (V)
Line Regulation
Output Voltage Deviation (%)
0
0.2
0.4
0.6
0.8
1
24
6 8 10 12
TIME (us)
Line Transient Response
Output Voltage Deviation (mV) Input Voltage (V)
-40
-20
0
20
40
5.5
6.5
7.5 Cin=1uF
Cout=10uF Tantalum
0 20 40 60 80 100 120 140 160 180 200
TIME (us)
Load Transient Response
Load Current (A) Output Voltage Deviation (mV)
010
20 30 40 50 60 70 80 90 100
-1
0
1
2
-20
-10
0
10
20
30 C in = 1uF
C out = 10 uF Tantalum
Preload = 100mA
Temperature (
o
C)
Load Regulation vs Temperature
Output Voltage Deviation (%)
-25 0 25 50 75 100 125
- 1
-0.80
-0.40
-0.20
0
0.20
I load=800mA
Dropout Voltage vs Output Current
Output Current (mA)
Dropout Voltage (V)
0
0. 2
0. 4
0. 6
0. 8
1. 0
1. 2
1. 4
1. 6
1. 8
2. 0
0250 500 750 1000
Tj = 125
o
C
Tj = 25
o
C
1A Low Dropout Positive Regulator
AP1122
Anachip Corp.
www.anachip.com.tw Rev.1.1 Feb 15, 2005
5/10
Marking Information
(1) SOT223-3L
X X X
1 1 2 2
Logo ID Code
Month: A~L = 01~12
Year:
(Top view)
"2" = 2002
"1" = 2001
~
(2) TO252-3L
1 1 2 2
ID Code
Xth Week: 01~52
Year:
(Top view)
"02" = 2002
"01" = 2001
X X X X X
~
Logo
(3) TO220-3L
1122
ID code
Year:
( Top view )
"02" = 2002
"01" = 2001
XX XX X
Xth week: 01~52
~
Logo
(5) TO263-3L
1122
ID code
Year:
( Top view )
"02" = 2002
"01" = 2001
XX XX X
Xth week: 01~52
~
Logo
(4) SOT89-3L
13
2
Date Code
Month: A~L
Year: 0~9
Identification Code
( See the table )
XX
XX
Identification code Output version
JB AP1122
1A Low Dropout Positive Regulator
AP1122
Anachip Corp.
www.anachip.com.tw Rev.1.1 Feb 15, 2005
6/10
Package Dimension
(1) SOT223
H E
K
D
B1
e
e1
ß
B
c
L
A1
Seating Plane
A
3.7
1.6
6.4
2.3
1.2
1.6
Land Pattern Recommendation (Unit: mm)
ß
α
Dimensions In Millimeters Dimensions In Inches
Symbol Min. Nom. Max. Min. Nom. Max.
A 1.50 1.65 1.80 0.059 0.065 0.071
A1 0.02 0.05 0.08 0.001 0.002 0.003
B 0.60 0.70 0.80 0.024 0.028 0.031
B1 2.80 - 3.40 0.110 - 0.134
c 0.28 0.30 0.32 0.011 0.012 0.013
D 6.30 6.50 6.70 0.248 0.256 0.264
E 3.30 3.50 3.70 0.130 0.138 0.146
e 2.3 Basic 0.091 Basic
e1 4.6 Basic 0.181 Basic
H 6.70 7.00 7.30 0.264 0.276 0.287
L 0.91 1.00 1.10 0.036 0.039 0.043
K 1.50 1.75 2.00 0.059 0.069 0.079
α 0° 5o 10° 0° 5o 10°
β - 13o - - 13o -
1A Low Dropout Positive Regulator
AP1122
Anachip Corp.
www.anachip.com.tw Rev.1.1 Feb 15, 2005
7/10
(2) TO263
E
e
L2
b
b2
D
L3
L
A
C2
C
L1
1.3
3
15.7
10.9
9.1
Land Pattern Recommendation (Unit: mm)
2.54
Dimensions In Millimeters Dimensions In Inches
Symbol Min. Nom. Max. Min. Nom. Max.
A 4.06 4.45 4.83 0.160 0.175 0.190
b 0.51 0.75 0.99 0.020 0.030 0.039
b2 1.14 1.27 1.40 0.045 0.050 0.055
C 0.38 TYP. 0.015 TYP.
C2 1.14 1.27 1.40 0.045 0.050 0.055
D 8.65 9.15 9.65
0.341 0.360 0.380
E 9.65 9.97 10.29 0.380 0.393 0.405
e 2.54 BSC. 0.100 BSC.
L 14.61 15.24 15.88 0.575 0.600 0.625
L1 2.28 2.54 2.80
0.090 0.100 0.110
L2 - 1.30 2.92 - 0.051 0.115
L3 1.27 1.52 1.78 0.050 0.060 0.070
1A Low Dropout Positive Regulator
AP1122
Anachip Corp.
www.anachip.com.tw Rev.1.1 Feb 15, 2005
8/10
(3) TO252
b2
E
e
b
L2
e1
DL1
H
A
C1
C
A1
SEATING PLANE
SEE NOTE2
L
5.6
11.0
5.6
2.0
2.25
Land Pattern Recommendation (Unit: mm)
7.2
1.2
Notes:
1. JEDEC Outline: TO-252 AB
2. Mils suggested for positive contact at mounting.
Dimensions In Millimeters Dimensions In Inches
Symbol Min. Nom. Max. Min. Nom. Max.
A 2.18 2.29 2.40 0.086 0.090 0.094
A1 0.89 - 1.14 0.035 - 0.045
b 0.61 TYP. 0.024 TYP.
b2 5.20 5.35 5.50 0.205 0.211 0.217
C 0.45 0.52 0.58 0.018 0.020 0.023
C1 0.45 0.52 0.58 0.018 0.020 0.023
D 5.40 5.57 6.20 0.213 0.219 0.244
E 6.35 6.58 6.80 0.250 0.259 0.268
e 2.28 BSC. 0.090 BSC.
e1 4.57 BSC. 0.180 BSC.
H 9.00 9.70 10.40 0.354 0.382 0.409
L 0.51 - - 0.020 - -
L1 0.64 0.83 1.02 0.025 0.033 0.040
L2 0.88 - 1.27 0.035 - 0.050
1A Low Dropout Positive Regulator
AP1122
Anachip Corp.
www.anachip.com.tw Rev.1.1 Feb 15, 2005
9/10
(4) TO220
A
J1
F
C
SEATING PLANE
D
Q
E
L1
L
b
e
e1
b1
ΦP
H1
Dimensions In Millimeters Dimensions In Inches
Symbol Min. Nom. Max. Min. Nom. Max.
A 3.55 4.20 4.85 0.140 0.165 0.191
b1 1.14 1.46 1.78 0.045 0.057 0.070
b 0.51 0.83 1.14 0.020 0.033 0.045
C 0.31 0.72 1.14 0.012 0.028 0.045
D 14.20 15.35 16.50 0.559 0.604 0.650
E 9.70 10.20 10.70 0.382 0.402 0.421
e 2.29 2.54 2.79 0.090 0.100 0.110
e1 4.83 5.08 5.33 0.190 0.200 0.210
F 0.51 0.95 1.40 0.020 0.037 0.055
H1 5.84 6.35 6.86 0.230 0.250 0.270
J1 2.03 2.48 2.92 0.080 0.098 0.115
L 12.72 13.72 14.72 0.501 0.540 0.580
L1 3.66 5.00 6.35 0.144 0.197 0.250
øP 3.53 3.81 4.09 0.139 0.150 0.161
Q 2.54 2.98 3.43 0.100 0.117 0.135
1A Low Dropout Positive Regulator
AP1122
Anachip Corp.
www.anachip.com.tw Rev.1.1 Feb 15, 2005
10/10
(5) SOT89
L
HE
E
D1
e1
e
A
D
b1
bb
8
0
(2x)
1.7
c
0.4
0.9
2.7
1.3
1.9
5
0
(2x)
Land Pattern Recommendation (Unit: mm)
1.5
Dimensions In Millimeters Dimensions In Inches
Symbol Min. Nom. Max. Min. Nom. Max.
A 1.40 1.50 1.60 0.055 0.059 0.063
b 0.36 0.42 0.48 0.014 0.016 0.018
b1 0.41 0.47 0.53 0.016 0.043 0.051
C 0.35 0.39 0.43 0.014 0.015 0.017
D 4.40 4.50 4.60 0.173 0.177 0.181
D1 1.40 1.60 1.75 0.055 0.062 0.069
e 2.90 3.00 3.10 0.114 0.118 0.122
e1 1.45 1.50 1.55 0.057 0.059 0.061
E 2.35 2.48 2.60 0.093 0.098 0.102
HE 3.94 - 4.25 0.155 - 0.167
L 0.80 - 1.20 0.031 - 0.047
