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AS1358/AS1359
150mA/300mA, Ultra-Low-Noise, High-PSRR Low Dropout Regulators
Product Brief
1 General Description
The AS1358/AS1359 are ultra-low-noise, low-dropout linear regulators specifically designed to deliver up to 150/300mA continuous output current, and can achieve a low 140mV dropout for 300mA load current. The LDOs are designed and optimized to work with low-cost, smallcapacitance ceramic capacitors. The devices are available as the standard products listed in Table 1. Table 1. Standard Products Model AS1358 AS1359 Load Current 150mA 300mA Output Voltage Preset - 1.5 to 4.5V Preset - 1.5 to 4.5V
2 Key Features
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Preset Output Voltages: 1.5 to 4.5V (in 50mV steps) Output Noise: 9VRMS @ 100Hz to 100kHz Power-Supply Rejection Ratio: 92dB @ 1kHz Low Dropout: 140mV @ 300mA Load Stable with 1F Ceramic Capacitor for any Load Guaranteed 150/300mA Output 1.25V Internal Reference Extremely-Low Quiescent Current: 40A Excellent Load/Line Transient Overcurrent and Thermal Protection TSOT23 5-pin Package
An integrated P-channel MOSFET pass transistor allows the devices to maintain extremely low quiescent current (40A). The AS1358/AS1359 uses an advanced architecture to achieve ultra-low output voltage noise of 9VRMS and a power-supply rejection-ratio of better than 80dB (up to 10kHz). The AS1358/AS1359 requires only 1F output capacitor for stability at any load. When the LDO is disabled, current consumption drops below 500nA. The devices are available in a TSOT23 5-pin package.
3 Applications
The devices are ideal for mobile phones, wireless phones, PDAs, handheld computers, mobile phone base stations, Bluetooth portable radios and accessories, wireless LANs, digital cameras, personal audio devices, and any other portable, battery-powered application.
Figure 1. Typical Application Circuit
Input 2 to 5.5V CIN 1F
1 IN
5 OUT
Output 1.5 to 4.5V IN 1 5 OUT
2 GND
AS1358/ AS1359
GND 2
AS1358/ AS1359
On Off
3 SHDNN
4
CBYPASS 10nF COUT 1F
SHDNN 3
4 BYPASS
BYPASS
www.austriamicrosystems.com
Revision 1.00
1-2
AS1358/AS1359
Product Brief
Copyrights
Copyright (c) 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, 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. austriamicrosystems 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 technical 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
For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact
www.austriamicrosystems.com
Revision 1.00
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