Dual-Channel, 3.3V/500mA and 1.8V/300mA Linear Regulator
Copyright
ANPEC Electronics Corp.
Rev. A.1 - July., 2004
APL5523
www.anpec.com.tw
1
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Features
General Description
The APL5523 is a dual low dropout regulator with
output1 with 3.3V/0.5A and output2 with 1.8V/0.3A
output capability. In order to obtain lower dropout
voltage and faster transient response, which is criti-
cal for low voltage applications, the APL5223 has
been optimized. The dropout voltages are guaran-
teed at 0.6V at 0.5A for output1 and 0.9V at 0.3A for
output 2. Current limit is trimmed to ensure speci-
fied output current and controlled short-circuit current.
On-chip thermal limiting provides protection against
any combination of overload that would create ex-
cessive junction temperatures. The APL5523 regu-
lator comes in a SOP-8 and SOP-8-P package.
Applications
Desktop Computer
Networking Systems
Optical Data Storage Systems
Fixed Output Voltage :
V
OUT1
=3.3V/500mA
V
OUT2
=1.8V/300mA
Low Dropout Voltage (defined as the minimum
input/output voltage difference):
Output 1 Dropout Voltage : 0.6V (at 500mA)
Output 2 Dropout Voltage : 0.9V (at 300mA)
Stable with 4.7uF Output Capacitor(at V
OUT1
)
Stable with 2.2uF Output Capacitor(at V
OUT2
)
Built in Thermal Protection
Built in Current Limit Protection
Fast transient Response
Short Setting Time
SOP-8 and SOP-8-P Package Available
Pin Configuration
SOP
-
8 (Top View)
Ordering and Marking Information
A P L 5523
H a n d lin g C o d e
T e m p. R an g e
P a c ka g e C o d e
P a c ka g e C o d e
K : S O P -8 K A : S O P -8-P
O pe ra ting J u nc tio n T e m p . R a ng e
C : 0 to 1 5 0C
H a n d lin g C o d e
T U : T u be T R : T a p e & R e e l
L e ad F re e C o d e
L : L e a d F re e D e vic e B la n k : O rigin a l D evice
A P L 5 5 2 3 K /K A :
A P L 5 5 2 3
XXXXX
XXXXX - D a te C od e
L e ad F re e C o d e
SOP-8-P (Top View)
(connected to GND plane for better heat
dissipation)
= Thermal Pad
G N D
1
2
3
8
6
4
7
5
V
I N
N C
N C
N C
V
I N
V
O U T 2
V
O U T 1
G N D
1
2
3
8
6
4
7
5
V
I N
G N D
G N D
G N D
V
I N
V
O U T 2
V
O U T 1
Copyright
ANPEC Electronics Corp.
Rev. A.1 - July., 2004
APL5523
www.anpec.com.tw
2
Pin Description
PIN
No. Name
I/O Description
1 V
OUT1
O
V
OUT1
output Voltage 3.3V. sources up to 500 mA.
2 V
IN
I
Supply
Voltage.
3 V
IN
I
Supply
Voltage.
4 V
OUT2
O
V
OUT2
output Voltage 1.8V. sources up to 300 mA.
5 GND
6 GND
7 GND
8 GND
Ground also functions as a heatsink. Solder to the ground plane to
maximize thermal dissipation
Absolute Maximum Ratings
Electrical Characteristics
Unless otherwise noted these specifications apply over full temperature, C
IN
=1
F, C
OUT1
=4.7
F,
C
OUT2
=2.2
F, T
J
=0 to 125
C. Typical values refer to T
J
=25
C.
APL5523
Symbol Parameter
Test
Conditions
Min. Typ. Max.
Unit
V
IN
Input
Voltage
2.7
6
V
I
SHORT
Short
Current
V
OUT
=0V
50 mA
OTS Over Temperature
Shutdown
150
C
Over Temperature
Shutdown Hysteresis
Hysteresis
20
C
TC
Output Voltage
Temperature
Coefficient
100
ppm/
C
I
OUT1
=500mA, I
OUT2
=300mA
900
1000
I
Q
Quiescent
Current
I
OUT1
=0mA, I
OUT2
=0mA
100
200
A
Symbol Parameter Rating
Unit
V
IN
, V
OUT
Input Voltage or Out Voltage
6
V
R
TH,JA
Thermal Resistance Junction to Ambient
SOP-8
150
C/W
SOP-8-P
75
R
TH,JC
Thermal Resistance Junction to Case
SOP-8
30
C/W
SOP-8-P
5
PD
Power Dissipation
Internally Limited
W
TJ
Operating Junction Temperature
C
Control Section
0 to 125
Power Transistor
0 to 150
TSTG
Storage Temperature Range
-65 to +150
C
TL
Lead Temperature (Soldering, 10 second)
260
C
Copyright
ANPEC Electronics Corp.
Rev. A.1 - July., 2004
APL5523
www.anpec.com.tw
3
1
APL5523
Symbol Parameter
Test
Conditions
Min. Typ. Max.
Unit
Output1 (500mA)
V
OUT
Output Voltage
V
IN
=5V
V
OUT
-2
%
3.3
V
OUT
+2
%
V
I
LIMIT
Circuit Current Limit
V
IN
=V
OUT
+1V
900 mA
I
OUT
Load Current
V
IN
=V
OUT
+1V
500
mA
REG
LINE
Line Regulation
V
OUT
+1V< V
CC
<6.0V, I
OUT
=1mA
5 10 mV
REG
LOAD
Load Regulation
V
IN
=V
OUT
+1V, 0mA< I
OUT
< I
MAX
40
60 mV
PSRR Ripple Rejection
F
1kHz, 1Vpp at I
OUT
=50mA 40
48
dB
V
DROP
Dropout
Voltage
(Note1)
I
OUT
=500mA
0.6
0.7
V
C
OUT
Output Capacitor
4.7
F
ESR
0.01
0.1
1
Ohm
Output2(300mA)
V
OUT
Output Voltage
V
IN
=5V
V
OUT
-2
%
1.8
V
OUT
+2
%
V
I
LIMIT
Circuit Current Limit
V
IN
=V
OUT
+1V
900 mA
I
OUT
Load Current
V
IN
=V
OUT
+1V
300
mA
REG
LINE
Line Regulation
V
OUT
+1V< V
CC
<6.0V, I
OUT
=1mA
4 10 mV
REG
LOAD
Load Regulation
V
IN
=V
OUT
+1V, 0mA< I
OUT
< I
MAX
20
40
mV
PSRR Ripple Rejection
F
1kHz, 1Vpp at I
OUT
=50mA 45
55
dB
V
DROP
Dropout
Voltage
(Note1)
I
OUT
=300mA
0.9
1
V
C
OUT
Output Capacitor
2.2
F
ESR
0.01
0.1
1
Ohm
Electrical Characteristics (Cont.)
Note1 : Dropout voltage definition : V
IN
-V
OUT
when V
OUT
is 2% below the value of V
OUT
for V
IN
= V
OUT
+1V
Application Circuit
V
OUT1
5
6
7
8
1
2
3
4
V
OUT2
V
IN
4.7
F
1
F
2.2
F
APL5523
Unless otherwise noted these specifications apply over full temperature, C
IN
=1
F, C
OUT1
=4.7
F,
C
OUT2
=2.2
F, T
J
=0 to 125
C. Typical values refer to T
J
=25
C.
Copyright
ANPEC Electronics Corp.
Rev. A.1 - July., 2004
APL5523
www.anpec.com.tw
4
3.280
3.285
3.290
3.295
3.300
3.305
3.310
-40
-20
0
20
40
60
80
100
120
140
I
OUT1
=0mA
0
100
200
300
400
500
600
0
100
200
300
400
500
V
IN
=5V
V
OUT1
V
OUT2
0
20
40
60
80
100
120
140
160
0
1
2
3
4
5
6
I
OUT1
=I
OUT2
=0mA
Quiescent Current vs. Input Voltage
Quiescent Current (
A)
Input Voltage (V)
Typical Characteristics
0
0.5
1
1.5
2
2.5
3
3.5
0
1
2
3
4
5
V
OUT1
V
OUT2
I
OUT1
=I
OUT2
=0mA
Output Voltage vs. Input Voltage
Output V
oltage (V)
Input Voltage (V)
Quiescent Current vs. Output Current
Quiescent Current (
A)
Output Current (mA)
Temperature (
C)
Output1 V
oltage (V)
Output1 Voltage vs. Temperature
Copyright
ANPEC Electronics Corp.
Rev. A.1 - July., 2004
APL5523
www.anpec.com.tw
5
1.792
1.794
1.796
1.798
1.800
1.802
1.804
-40 -20
0
20
40
60
80
100 120 140
I
OUT2
=0mA
0
100
200
300
400
500
600
700
800
900
1000
0
100
200
300
400
500
V
OUT1
V
OUT2
Typical Characteristics
-80
0
-70
-60
-50
-40
-30
-20
-10
10
100k
100
1k
10k
PSRR (dB)
PSRR vs. Frequency
Frequency (Hz)
V
IN
= 5V
I
OUT1
=
I
OUT2
= 50mA
V
OUT1
V
OUT2
Load-Transient Response
Time (0.1ms/div)
V
OUT1
(100mv/div)
I
OUT1
=1mA~500mA
C
OUT1
=4.7uF(Aluminum)
Tr=1us
Dropout Voltage vs. Output Current
Output Current (mA)
Dropout V
oltage (mV)
Temperature (
C)
Output2 V
oltage (V)
Output2 Voltage vs. Temperature
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