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
AP 1122 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
2.5V
C1
100uF
Vin
Vout
GND
Tab is Vout
C2
100uF
1.2V/1A
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.1.0 Oct 21, 2004
1/10
AP1122
1A Low Dropout Positive Regulator
Connection Diagram
3 PIN SOT223
( Top View )
3
2
1
Tab is Vout
Vin
Vout
GND
1
Tab is Vout
3 PIN SOT89
3 PIN TO220
GND
3 PIN TO252 / TO263
( Top View )
3
2
Vin
Vout
3
2
1
Tab is Vout
Vin
Vout
GND
3
2
1
Tab is Vout
Vin
Vout
GND
Block Diagram
Vin
3
2
Vout
+
+
-
CURRENT
LIMIT
1.2V
+
+
-
Thermal
Shutdown
1
GND
Anachip Corp.
www.anachip.com.tw
2/10
Rev.1.0 Oct 21, 2004
AP1122
1A Low Dropout Positive Regulator
Pin Descriptions
NAME
GND
Vout
I/O
I
O
PIN #
1
2
FUNCTION
Ground Pin
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 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.
Vin
I
3
Absolute Maximum Ratings
Symbol
Vin
P
D
T
ST
T
OP
Parameter
DC Supply Voltage
Power Dissipation
Storage Temperature
Operating Junction Temperature Range
Rating
Unit
-0.3 to 12
V
Internally Limited
o
-65 to +150
C
o
0 to +150
C
Electrical Characteristics
(Under Operating Conditions)
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Dropout Voltage
(V
IN
-V
OUT
)
Current Limit
Minimum Load
Current
Thermal Regulation
CONDITIONS
2.5V≦VIN≦12V, T
J
=25
o
C
o
I
O
=10mA, 2.5V<V
IN
<12V, T
J
=25 C
V
IN
=2.5V~12V,Vadj=0,0mA<Io<1A, T
J
=25
o
C
(Note 1,2)
I
OUT
= 1A ,∆V
OUT
=0.1%V
OUT
(V
IN
-V
OUT
) = 5V
0
o
C≦Tj≦125
o
C
1. 1
5
0.008
60
0.5
300
117
92
85
100
15
0.65/2.7
10
0.65/2.7
10
0.04
70
MIN
1.176
TYP
1.2
MAX
1.224
0.2
1
1.3
1.4
UNIT
V
%
%
V
A
mA
%/W
dB
%
o
T
A
=25
o
C, 30ms pulse
F=120Hz,C
OUT
=25uF Tantalum, I
OUT
=1A,
Ripple Rejection
V
IN
=V
OUT
+3V
Temperature Stability I
O
=10mA
θ
JA
Thermal
SOT89
Resistance Junction- SOT-223
TO-252
to-Ambient (No heat
TO-220/263
sink ;No air flow)
SOT89 : Control Circuitry/Power Transistor
θ
JC
Thermal
SOT-223 : Control Circuitry/Power Transistor
TO-263 : Control Circuitry/Power Transistor
Resistance
TO-252 : Control Circuitry/Power Transistor
Junction-to-Case
TO-220 : Control Circuitry/Power Transistor
C/W
o
C/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.
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