AS13985
Micropower 150mA Low-Noise LDO
www.austriamicrosystems.com
Revision 1.03
1 - 2
austria
micro
systems
P r o d u c t B r i e f
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 22F. The low equivalent series resistance (5
) of
these capacitors ensures low output impedance at high fre-
quencies.
Automatic sleep mode requires less than 1A 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 30V. 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 95A)
!
Output Voltage Accuracy: 1%
!
Minimal External Components Required
!
High Peak-Current Capability
!
Low Shutdown Current:
1A
!
Operating Temperature Junction Range: -40 to +125C
!
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.
V
REF
AS13985
Over-Current/
Over-Temperature
Protection
+
3
EN
1
V
IN
5
V
OUT
4
BYPASS
2
GND
www.austriamicrosystems.com
Revision 1.03
2 - 2
AS13985
austria
micro
systems
Product Brief
Copyrights
Copyright 1997-2006, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered . All rights reserved. The material herein may not be reproduced, adapted, merged, trans-
lated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
the information set forth herein or regarding the freedom of the described devices from patent infringement. austriami-
crosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior
to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information.
This product is intended for use in normal commercial applications. Applications requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-
sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for
each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard
production flow, such as test flow or test location.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to
personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the tech-
nical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters
austriamicrosystems AG
A-8141 Schloss Premstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
e-mail:
info@austriamicrosystems.com
For Sales Offices, Distributors and Representatives, please visit:
http://www.austriamicrosystems.com
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