AS1301_1 AMSCO
Document overview
- Manufacturer or author: Provided By digicamel.com
- PDF pages: 16
Technical content
1 General Description
5.25V input to regulated 5V output with 5% accuracy. being drawn from the battery during start-up. and WL-CSP 8-bumps packages.
2 Key Features
3 Applications
and remote data-acquisition systems. Figure 1. Typical Application Diagram
4 Pin Assignments
Figure 2. Pin Assignments (Through View) Table 1. Pin Descriptions C2+ 1 D1 Connector 2+. Positive terminal of flying cap 2. ≥2.2µF low ESR ceramic capacitor. NC 3 - Connected to GND or left floating. NC 4 - Connected to GND or left floating. NC 5 - Connected to GND or left floating. high for normal operation. For shutdown, set to logic low. C1+ 7 C1 Connector 1+. Positive terminal of flying cap 1. C2- 8 C2 Connector 2-. Negative terminal of flying cap 2. a ≥2.2µF low ESR ceramic capacitor. C1- 10 D2 Connector 1-. Negative terminal of flying cap 1.
10 C1-
9 VBATT
8 C2-
7 C1+
5 Absolute Maximum Ratings
Table 2. Absolute Maximum Ratings State Surface Mount Devices”. packages is matte tin (100% Sn).
6 Electrical Characteristics
TAMB = +25ºC, unless otherwise specified. Table 3. Electrical Characteristics
- The device is tested in a proprietary test mode.
- The inrush current is limited by the internal soft-start circuitry.
7 Typical Operating Characteristics
VIN = 2.7 to 5.25V, VOUT = 5V, COUT = CBAT = 2.2µF , CFLY1 = CFLY2 =220nF, TAMB = +25ºC, unless otherwise specified. Figure 3. Efficiency vs. Input Voltage; ILOAD=10mA Figure 4. Efficiency vs. Input Voltage; ILOAD=20mA Figure 5. Efficiency vs. Input Voltage; ILOAD=30mA Figure 6. Efficiency vs.Input Voltage; ILOAD=40mA Figure 7. Efficiency vs. Input Voltage; ILOAD=50mA Figure 8. Quiescent Current vs. Input Voltage
8 Detailed Description
The AS1301 is a high efficiency and low noise switched capacitor DC-DC converter that is capable of boost operation. the smallest voltage ripple possible. Figure 26. Functional Block Diagram
www.austriamicrosystems.com Revision 1.03 11 - 16 AS1301 Data Sheet - Detailed Description Overload Protection When the output voltage drops significantly below battery voltage due to a very high load the AS1301 enters into an overload protection condition. In this condition the output is connected to the input via a current limiting connection. Once the overload is removed, the device enters soft-start period and ramps up to the nominal output voltage. Undervoltage Lockout, UVLO The AS1301 is equipped with undervoltage lockout functionality. If the battery voltage drops below 2.7V (typ) the device enters the undervoltage lockout condition. The device remains in this condition until the battery voltage is high enough to enter the soft-start period. An internal hysteresis of 100mV will prevent ringing during startup. If the input voltage climbs back to 2.8V (typ) after such a condition, the device turns-on automatically. Shutdown Mode The AS1301 enters low-power shutdown mode when EN is set to logic low. In shutdown the charge-pump action is halted, the output is completely disconnected from the input and VOUT will drop to 0V. During shutdown the output is set to a high-Z condition. So it can be forced higher voltage then the input, because the permanent monitoring of the input- and output voltage will prevent an erroneous current form the output back to the input during shutdown. Thermal Shutdown The AS1301 offers thermal shutdown, which prevents eventual damage due to an over-temperature condition. Thermal shutdown will be initiated if the junction temperature exceeds 145°C. If the temperature drops below this value, the thermal shutdown will be released automatically and the device will resume operation.
9 Application Information
the output voltage performance. frequency. Another factor affecting capacitor ESR is temperature. capacitors are recommended since they have extremely low ESR and are available in small footprints. transients. During startup and mode change it supplies part of the peak input current drawn by the device. of the flying capacitors directly adds to the output source resistance of the charge pump. Therefore low ESR capacitors, e.g. tantalum or ceramic, are recommended for the flying capacitors as well. Table 4. Recommended Input and Output Capacitor Table 5. Recommended Flying Capacitor
The device is available in a TDFN (3x3x0.8mm) 10-pin and WL-CSP 8-bumps package. Figure 29. TDFN (3x3x0.8mm) 10-pin package Diagram
- Dimensioning and tolerancing conform to ASME Y14.5M-1994.
- All dimensions are in millimeters, angle is in degrees.
- N is the total number of terminals.
Table 6. TDFN (3x3x0.8mm) 10-pin package Dimensions
Figure 30. WL-CSP 8-bumps Package Diagram
Table 7. Ordering Information
www.austriamicrosystems.com Revision 1.03 16 - 16 AS1301 Data Sheet - Ordering Information Copyrights Copyright © 1997-2008, austriamicrosystems AG, Schloss Premstaetten, 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 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-us