AS1363
1A Low Dropout Linear Voltage Regulator
www.ams.com/LDO Revision 1.9 1 - 19
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 ve rsion
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
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.
2 Key Features
Guaranteed Output Current: 500mA
Low Dropout: 150mV @ 500mA
2.0V to 5.5V Input Voltage
Fixed Output V oltage: 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
3 Applications
The device is ideal for laptops, PDAs, portable audio devices, mobile
phones, cordless phones, and any other battery-operated portable
device.
Model Output Type BYP SET
AS1363-AD Adjustable No Yes
AS1363-_ _ Fixed Yes No
AS1363-AD
COUT2
.2µF
1
IN
6
OUT
3
EN
2
POK
5
SET
CIN
1µF
VIN 2.0V
to 5.5V
V
OUT
1.2V to 5.3V
4
GND
On
Off
R1
R2
RPOK
100k
VOUT Logic Sup-
ply Voltage
To Controller
Figure 1. AS1363 - Typical Application Circuit
