AS1363
1 A L o w D r o p o u t L i n e a r Vo l t a g e R e g u l a t o r
1 General Description
The AS1363 is a low-dropout linear regulator that operates from a
+2.0V to +5.5V supply and delivers a guaranteed 500mA load
current with low 150mV dropout.
The device is available in two versions
(see Table 1).
One version
has a high-accuracy output with a preset voltage (1.2V, 1.5V, 1.8V,
3.0V, 3.3V, or 4.5V). This voltage is internally trimmed and also offers
a Bypass pin. With a capacitor connected to this Bypass pin, the
PSRR and the Noise performance is improved.
At the other version the output voltage is user-adjustable (1.2V to
5.3V) and offers an SET pin for setting the output voltage.
Table 1. Standard Products
Model
AS1363-AD
AS1363-_ _
Output Type
Adjustable
Fixed
BYP
No
Yes
SET
Yes
No
2 Key Features
Guaranteed Output Current: 500mA
Low Dropout: 150mV @ 500mA
2.0V to 5.5V Input Voltage
Fixed Output Voltage: 1.2V to 5.0V
User-Adjustable Output Voltage: 1.2V to 5.3V
Power OK Output
Low Quiescent Current: 40µA
Low Shutdown Current: 30nA
Thermal Overload Protection
Output Current Limit
Output discharge path during shutdown
6-pin SOT23 Package
A low supply current (65µA typ.) at maximum load is making the
device ideal for portable battery-operated equipment.
Other features are included such as an active-low open-drain reset
output that indicates when the output is out of regulation, a low-
current (30nA typ.) shutdown mode, an integrated short-circuit and a
thermal shutdown protection.
When in shutdown, a 5k (typ) discharge path is connected
between the output pin and ground. The AS1363 is available in a 6-
pin SOT23 package.
Figure 1. AS1363 - Typical Application Circuit
3 Applications
The device is ideal for laptops, PDAs, portable audio devices, mobile
phones, cordless phones, and any other battery-operated portable
device.
V
IN
2.0V
to 5.5V
C
IN
1µF
1
IN
6
OUT
C
OUT
2
.2µF
R
1
V
OUT
1.2V to 5.3V
On
Off
3
EN
2
POK
AS1363-AD
5
SET
R
2
4
GND
To Controller
R
POK
100k
V
OUT
Logic Sup-
ply Voltage
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AS1363
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
IN 1
6 OUT
POK 2
AS1363
5 SET/BYP
EN 3
4 GND
4.1 Pin Descriptions
Table 2. Pin Descriptions
Pin Number
1
2
3
4
Pin Name
IN
POK
EN
GND
SET
5
BYP
6
OUT
Description
+2.0V to +5.5V Supply Voltage.
Bypass this pin with a 1µF capacitor to GND
(see Package
Drawings and Markings on page 16).
Open-Drain POK Output.
POK remains low while V
OUT
is below the POK threshold. Connect
a 100k pull-up resistor from this pin to OUT to obtain an output voltage
(see Figure on page
1).
Active-High Enable Input.
A logic low reduces supply current below 30nA. In shutdown mode,
the POK output is low, and OUT is high impedance. Connect this pin to IN for normal operation.
Ground
Voltage-Setting Input.
Connect to GND for preset output or Connect to a resistive voltage-
divider between OUT and GND to set the output voltage between 1.2V and 5.3V
(see Figure on
page 1).
Bypass Pin.
Connect a 10nF capacitor from this pin to V
OUT
to improve PSRR and noise
performance
(see Figure 16 on page 9).
Output.
Sources up to 500mA. Bypass this pin with a 2.2µF low-ESR capacitor to GND
(see
Figure on page 1).
Note:
For output voltages below 2V a 4.7µF capacitor should be used.
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AS1363
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in
Table 3
may cause permanent damage to the device. These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those indicated in
Electrical Characteristics on page 4
is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 3. Absolute Maximum Ratings
Parameter
IN, POK, EN, SET/BYP to GND
OUT to GND
Output Short-Circuit Duration
Continuous Power Dissipation
Operating Temperature Range
Storage Temperature Range
Junction Temperature
-40
-65
Min
-0.3
-0.3
Max
+6
V
IN
+0.3
1
800
+85
+150
+125
Units
V
V
min
mW
ºC
ºC
ºC
The reflow peak soldering temperature (body temperature)
specified is in accordance with
IPC/JEDEC J-STD-020
“Moisture/Reflow Sensitivity Classification for Non-
Hermetic Solid State Surface Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin
(100% Sn).
Represents an unlimited floor life time
T
AMB
= +70ºC; derate 10mW/ºC above +70ºC
Comments
Package Body Temperature
+260
ºC
Moisture Sensitive Level
1
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AS1363
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control)
methods.
V
IN
= V
OUT(NOM)
+ 500mV or V
IN
= +2.0V (whichever is greater), C
IN
= 1µF, C
OUT
= 2.2µF, EN = IN, T
AMB
= -40 to +85ºC (unless otherwise
specified). Typical values are at T
AMB
= +25ºC.
Table 4. Electrical Characteristics
Symbol
V
IN
V
POR
Parameter
Input Voltage
Power On reset
Output Voltage Accuracy
(Preset Mode)
V
OUT
V
SET/BYP
I
OUT
I
LIMIT
Adjustable Output Voltage Range
SET/BYP Voltage Threshold
(Adjustable Mode)
Guaranteed Output Current (RMS)
Short-Circuit Current Limit
In-Regulation Current Limit
SET/BYP Threshold
I
SET
I
Q
V
IN
- V
OUT
V
LNR
V
LDR
PSRR
SET/BYP Input Bias Current
Quiescent Current
Dropout Voltage
Line Regulation
Load Regulation
Ripple Rejection
2
Condition
Falling, 100mV hysteresis
I
OUT
= 100µA, T
AMB
= +25ºC,
I
OUT
= 100mA
I
OUT
= 1 to 500mA, V
IN
> (V
OUT
+ 0.5V)
1
Min
2.0
1.78
-0.75
-1.5
-2
1.2
Typ
1.87
Max
5.5
1.96
+0.75
+1.5
+2
5.3
Unit
V
V
%
V
V
mA
V
IN
= 2.5V, I
OUT
= 1mA, V
OUT
set to 2.0V
1.17
500
1.20
1.23
V
OUT
= 0V
V
OUT
> 96% of nominal value
0.55
50
0.8
0.8
100
40
65
150
1.2
150
+100
150
200
320
+0.125
+0.001
A
A
mV
nA
µA
mV
%/V
%/mA
dB
V
SET/BYP
= 1.2V
I
OUT
= 100µA
I
OUT
= 500mA
I
OUT
= 500mA
V
OUT
= 2.5V
-100
V
IN
from (V
OUT
+ 100mV) to 5.5V,
I
LOAD
= 5mA
I
OUT
= 1 to 500mA
f = 1kHz, I
OUT
= 10mA, adjustable Output
f = 10kHz, I
OUT
= 10mA, adjustable Output
f = 100kHz, I
OUT
= 10mA, adjustable Output
10Hz to 100kHz, I
OUT
= 10mA, adjustable Output
100Hz to 100kHz, I
OUT
= 10mA, adjustable Output
EN = GND, V
IN
= 5.5V, T
AMB
= 25°C
EN = GND, V
IN
= 5.5V
2.0V < V
IN
< 5.5V
2.0V < V
IN
< 5.5V
EN = IN or GND, T
AMB
= +25ºC
T
AMB
= +85ºC
-0.125
-0.001
65
70
60
80
65
0.03
1.6
Output Voltage Noise
Shutdown
I
OFF
V
IH
V
IL
I
EN
Shutdown Supply Current
EN Input Threshold
EN Input Bias Current
µV
RMS
0.5
15
0.6
µA
V
V
nA
1
5
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AS1363
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 4. Electrical Characteristics (Continued)
Symbol
POK Output
V
OL
POK Output Low Voltage
Operating Voltage Range for Valid
POK Signal
POK Output High leakage Current
POK Threshold
Thermal Protection
T
SHDNN
T
SHDNN
C
OUT
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Output Capacitor
Load Capacitor Range
Load Capacitor ESR
1
170
20
2.2
500
ºC
ºC
µF
m
POK sinking 1mA
POK sinking 100µA
POK = 5.5V, T
AMB
= +25ºC
T
AMB
= +85ºC
Rising edge (referenced to V
OUT(NOM)
)
90
1.1
1
5
94
98
0.05
0.25
5.5
V
V
nA
%
Parameter
Condition
Min
Typ
Max
Unit
1. Guaranteed by production test of load regulation and line regulation.
2. Dropout voltage is defined as V
IN
- V
OUT
, when V
OUT
is 100mV below the value of V
OUT
measured for V
IN
= (V
OUT(NOM)
+ 500mV).
Since the minimum input voltage is 2.0V, this specification is only valid when V
OUT(NOM)
> 2.0V.
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