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 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

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 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

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

.2µF

1

IN

6

OUT

3

EN

2

POK

5

SET

1µF

2.0V

to 5.5V

1.2V to 5.3V

4

GND

On

Off

ply Voltage

To Controller

Figure 1. AS1363 - Typical Application Circuit