AS13985

Micropower 150mA Low-Noise LDO

www.austriamicrosystems.com

Revision 1.03

1 - 2

Produ ct Brief

1 General Description

The AS13985 is a high-performance low-dropout 150mA

voltage regulator designed for use with very-low ESR out-

put capacitors. The device can deliver superior perfor-

mance in all specifications critical to battery-powered

designs, and is perfectly suited for mobile phones, PDAs,

MP3 players, and other battery powered devices.

Stability is guaranteed with a ceramic output capacitor of

from 1 to 22µF. The low equivalent series resistance (5

Ω) of

these capacitors ensures low output impedance at high fre-

quencies.

Automatic sleep mode requires less than 1µA quiescent

current when pin EN is pulled low.

Regulation performance is excellent even under low drop-

out conditions, when the power transistor has to operate in

linear mode.

A 10nF bypass capacitor can be added to reduce output

noise to 30µV. The low-noise performance allows direct

connection of noise sensitive circuits without additional fil-

tering networks.

Multiple output voltage options are available as standard

products. Contact austriamicrosystems, AG for details.

The AS13985 is available in a 5-bump WLP package and a

5-pin SOT23 package.

Figure 1. Block Diagram

2 Key Features

!

Ultra-Low Dropout Voltage: (typically

45mV @ 150mA, 0.3mV @ 1mA)

!

Supply Range: 2.5 to 5.5V

!

Output Voltage Range: 1.2 to 5.0V (in 25mV Steps)

!

Output Current: 150mA (Guaranteed)

!

Stable with Low-ESR Output Capacitor

!

Integrated Over-Temperature/Over-Current Protection

!

Low GND Pin Current (only 95µA)

!

Output Voltage Accuracy: 1%

!

Minimal External Components Required

!

High Peak-Current Capability

!

Low Shutdown Current:

≤1µA

!

Operating Temperature Junction Range: -40 to +125°C

!

Smallest Available Packages:

- 5-bump WLP

-5-pin SOT23

3 Applications

The AS13985 is ideal for powering cordless and mobile

phones, MP3 players, CD and DVD players, PDAs, hand-

held computers, digital cameras, and any other hand-held

battery-powered device.

AS13985

Over-Current/

Over-Temperature

Protection

+

–

3

EN

1

5

4

BYPASS

2

GND