AS1375 AMSCO
Document overview
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- PDF pages: 11
Technical content
The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0 e-Mail: ams_sales@ams.com Please visit our website at www.ams.com
1 General Description
ackage and is qualified for -40°C to +85°C operation.
2 Key Features
3 Applications
Figure 1. AS1375 - Typical Application Diagram
4 Pin Assignments
Figure 2. Pin Assignments (Top View) Table 1. Pin Descriptions circuit-board ground plane to maximize power dissipation.
5 Absolute Maximum Ratings
Table 2. Absolute Maximum Ratings State Surface Mount Devices”. packages is matte tin (100% Sn).
6 Electrical Characteristics
otherwise specified). Typical values are at TAMB = +25ºC. Table 3. Electrical Characteristics
- Guaranteed by production test of load regulation.
- Dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT measured for VIN =
SQC (Statistical Quality Control) methods.
7 Typical Operating Characteristics
VIN = 3.5V, VOUT = 3.0V, TAMB = +25°C (unless otherwise specified). Figure 3. Line Regulation Figure 4. Load Regulation Figure 5. Ground Pin Current vs. Output Current Figure 6. Ground Pin Current vs. Input Voltage Figure 7. Output Voltage vs. Input Voltage - Dropout
8 Detailed Description
reference, error amplifier , P-channel MOSFET pass transistor. Additional blocks include a current limiter , thermal sensor, and enable logic. the feedback voltage is too high, the pass transistor gate is pulled high, allowing less current to pass to the output. Figure 8. AS1375 - Block Diagram voltage, thus limiting the device output current to 300mA. without causing damage to the device. temperature drops by 20ºC, resulting in a pulsed output during continuous thermal-overload conditions. do not exceed the absolute maximum junction temperature rating of +150ºC.
www.austriamicrosystems.com/LDOs/AS1375 Revision 1.02 7 - 10 AS1375 Datasheet - Application Information
9 Application Information
Capacitor Selection and Regulator Stability For normal operation, use a 1µF capacitor at pin IN and a 1µF capacitor at pin OUT. Larger input capacitor values and lower ESR provide better noise rejection and line-transient response. Reduce output noise and improve load-transient response, stability, and power-supply rejection by using large output capacitors. Note: Some ceramic die lectrics exhibit large capacitance and ESR variation with temperature. With dielectrics such as Z5U and Y5V, it may be necessary to use a 2.2µF or larger output capacitor to ensure stability at tempera- tures below -10°C. With X7R or X5R dielectrics, 1µF is sufficient at all operating temperatures. Noise, PSRR, and Transient Response The AS1375 is designed to deliver low dropout and low quiescent currents in battery-powered systems. The power- supply rejection is 85dB at 1kHz and 50dB at 100kHz. When operating from sources other than batteries, improved supp ly-noise rejection and transient response can be achieved by increasing the values of the input and output capacitors, and through passive filtering techniques. Dropout Voltage The AS1375 minimum dropout voltage determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Since the AS1375 use a P-channel MOSFET pass transistor, the dropout voltage is a function of drain-to-source on- resistance (RDS(ON)) multiplied by ILOAD. ams AG Technical content still valid
The device is available in a 6-pin TDFN 2x2mm package. Figure 9. 6-pin TDFN 2x2mm Package Diagram
- All dimensions are in millimeters, angle is in degrees (°).
- N is the total number of terminals.
- The location of the terminal #1 identifier and termina l numbering convention conforms to JEDEC publication 95
- ND and NE refer to the number of termin als on each D and E side respectively.
- NJR refer to non jedec registered.
- Dimension b applies to metallized terminal and is me asured between 0.15mm and 0.30mm from the terminal
- Coplanarity applies to the terminals a nd all other bottom surface metallization.
Table 4. 4-bumps WL-CSP package Dimensions
The devices are available as the standard products shown in Table 5. Note: All prod ucts are RoHS compliant. Table 5. Ordering Information
www.austriamicrosystems.com/LDOs/AS1375 Revision 1.02 10 - 10 AS1375 Datasheet Copyrights Copyright © 1997-2010, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. 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 reg istered 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 bel ieved 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 pe rsonal 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 Tobelbaderstrasse 30 A-8141 Unterpremstaetten, 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 ams AG Technical content still valid