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 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.
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)
Pb-Free
Packages: SOP-8L
Applications
•
•
PC peripheral
Communication
Connection Diagram
(Top View)
V
OUT1
1
V
IN
2
V
IN
3
V
OUT2
4
AP1121
8
7
6
5
GND
GND
GND
GND
Pin Descriptions
NAME
GND
3.3V(V
OUT1
)
2.5V/1.8V
(V
OUT2
)
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.
FUNCTION
V
IN
Ordering Information
AP 1121 X
Vout
A : CH1=3.3V
CH2=2.5V
B : CH1=3.3V
CH2=1.8V
X
X
Packing
Blank : Tube
A : Taping
Package
S : SOP-8L
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 Aug.17, 2004
1/5
AP1121
Dual 1A Low Dropout Positive Regulator
Typical Circuit
3.3V/1A
C1
100uF
5V
C2
100uF 2.5V/1A
C3
100uF
V
OUT1
GND
V
IN
V
IN
GND
GND
V
OUT2
GND
(3.3V/2.5V Dual output )
Absolute Maximum Ratings
Symbol
V
IN
P
D
T
ST
T
OP
DC Supply Voltage
Power Dissipation
Storage Temperature
Operating Junction Temperature Range
Parameter
Rating
-0.3 to 18 V
Internally Limited
-65 to +150
0 to +150
o
o
Unit
V
C
C
Block Diagram
2
V
IN
+
+
－
1.25V
CURRENT
LIMIT
+
Thermal
Shutdown
3
V
IN
+
+
－
1.25V
CURRENT
LIMIT
+
Thermal
Shutdown
－
7/8
GND
1
V
OUT1
+
5/6
GND
－
4
V
OUT2
+
Anachip Corp.
www.anachip.com.tw
2/5
Rev.1.0 Aug.17, 2004
AP1121
Dual 1A Low Dropout Positive Regulator
Electrical Characteristics
(Under Operating Conditions)
PARAMETER
CONDITIONS
I
OUT
= 10mA, T
J
= 25
o
C,
AP1121_ - V
OUT1
4.8V≦V
IN
≦12V
I
OUT
= 10mA, T
J
= 25
o
C,
AP1121A - V
OUT2
4V≦V
IN
≦12V
I
OUT
= 10mA, T
J
= 25
o
C,
AP1121B - V
OUT2
4V≦V
IN
≦12V
I
O
=10mA,V
OUT
+1.5V<V
IN
<12V, T
J
=25
o
C
V
IN
= 5V, 0≦I
OUT
≦1A,
AP1121 series
o
V
OUT1
T
J
=25 C (Note 1,2)
AP1121 series
V
IN
=4V, 0mA<Io<1A,
V
OUT2
T
J
=25
o
C (Note 1,2)
I
OUT
= 1A,∆V
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
θ
JA
Thermal Resistance
Junction-to-Ambient
(No heat sink; No air
flow)
(V
IN
-V
OUT
) = 5V
0
o
C≦Tj≦125
o
C (Note 3)
T
A
=25
o
C, 30ms pulse
F=120Hz,C
OUT
=25uF Tantalum, I
OUT
=1A
I
O
=10mA
SOP8: Control Circuitry/Power Transistor
(Note4)
CH1 or CH2 only
CH1 & CH2 and PD1=PD2
SOP8: Control Circuitry/Power Transistor
θ
JC
Thermal Resistance (Note 4)
CH1 or CH2 only
Junction-to-Case
CH1 & CH2 and PD1=PD2
C/W
20
12
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
input/output differentially 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 that requires maintaining regulation. At 12V input/output differential
the device is guaranteed to regulate if the output current is greater than 10mA.
Note4:
Vout1 and Vout2 are connected to the PCB cupper area 5.5mm*5.5mm separately. If you need large PD or lower Tc & Tj,
please connect to the large cupper area >> 5.5mm*5.5mm (like 10mm*10mm).
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