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ST763A series 3.3V Step down current mode PWM DC-DC converters Features Output voltage 3.3V Supply voltage range from 3.3V to 11V Guaranteed output current: 500mA Typical operation frequency: 200KHz Very low quiescent current: 0.6mA on mode 0.2A OFF MODE Switch ON/OFF control Typical efficiency: 90% Operating temperature range: -40C to 85C Available in SO-8 package variations. A minimum number of external components is used and the fixed frequency switching allows easy filtering of output ripple and noise. Other features of this device are cycle-by-cycle current limiting, overcurrent limiting, under voltage lockout and programmable soft-start protection. A 22H inductor works in most applications, so no sophisticated design is necessary. Package available is SO-8. Typical application are in 5V to 3.3V converters, cellular phones, portable instruments, hand-held computers, and peripherals. SO-8 Description The ST763A is a step-down switching regulator. It operates from 3.3V to 11V giving a fixed 3.3V output voltage, delivering up to 500mA. The mainly features are typical efficiency of 90%, quiescent current of 0.6mA, and only 0.2A in shut-down. The PWM current mode control provides precise output regulation and very good transient response. Output voltage accuracy is guaranteed to be 5% over line, load and temperature Order code Part number ST763AC May 2007 Rev. 3 Packaging ST763ACDTR 1/14 www.st.com 14 ST763A series Contents 1 2 3 4 5 6 7 8 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2/14 ST763A series Diagram 1 Figure 1. Diagram Schematic diagram 3/14 Pin configuration ST763A series 2 Figure 2. Pin configuration Pin connections (top view) Table 1. Pin N 1 2 3 4 5 6 7 8 Pin description Symbol SHDN REF SS CC OUT GND LX VCC Name and function Shutdown control (active low): If connected to GND the IC is in shutdown. Connect to VCC for normal operation (ON MODE). Reference output voltage: (1.25V): Bypass to GND with 47nF capacitor. Soft start: a capacitor between SS and GND provides soft-start and short-circuit protections. Compensation capacitor input: externally compensates the outer (voltage) feedback loop. Connect to OUT with 330pF capacitor Output voltage sense input: provides regulation of feedback sensing. Connect to 3.3V output. Ground Switch output. Drain of internal P-channel power MOSFET Supply voltage input. Bypass to GND with 1F ceramic capacitance and large value electrolytic capacitor in parallel. The 1F capacitor must be as close as possible to the GND and VCC pins. 4/14 ST763A series Maximum ratings 3 Table 2. Symbol VCC VLX VSHDN VS,VC ILX IREF PTOT Tstg Top Maximum ratings Absolute maximum ratings Parameter DC input voltage Switch pin voltage Shutdown voltage (SHDN) Soft start (SS) and compensation capacitor (CC) pins voltage Switching peak current Reference current Continuous power dissipation at TA = 70C Storage temperature range Operating junction temperature range AC series SO-8 Value -0.3 to 12 -0.3 to (VCC + 0.3) -0.3 to (VCC + 0.3) -0.3 to (VCC + 0.3) 2 2.5 344 -40 to +150 0 to +70 Unit V V V V A mA mW C C Note: Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied Thermal data Parameter Thermal resistance junction-ambient (1) SO-8 160 Unit C/W Table 3. Symbol RthJA 1. This value depends from thermal design of PCB on which the device is mounted. 5/14 Typical application ST763A series 4 Figure 3. Typical application Application circuit 6/14 ST763A series Electrical characteristics 5 Table 4. Symbol VCC VO VO VO Electrical characteristics Electrical characteristics (VCC = 5V, IO = 0mA, TA = TMIN to TMAX, unless otherwise specified). Parameter Input voltage Output voltage Line regulation Load regulation Power efficiency IO = 0 to 500mA IO = 300mA IO = 100mA ON Mode (Including switch current) VCC = 4 to 11V, IO = 0 to 300mA VCC = 4.75 to 11V, IO = 0 to 500mA Test conditions Min. 3.3 3.135 3.135 3.3 3.3 0.13 0.005 88 % 90 0.6 0.2 2 0.25 1 VCC Falling ILX = 500mA VCC = 12V, VLX = 0V TA = 25C TA = TMIN to TMAX TA = 25C 159 1.18 2.7 1 10 1.25 50 200 7500 212.5 1.32 3 2.5 100 mA A V V A V Typ. Max. 11 3.465 3.465 Unit V V V %/V %/mA ISUPPLY Supply current VIH VIL ISHDN VLOCK SHDN Input high threshold SHDN Input low threshold Shutdown input leakage current Under voltage lockout OFF Mode RDS(on) LX On resistance ILEAK VREF VREF fOSC RC LX Leakage current Reference voltage Temperature reference drift Switching frequency Compensation pin impedance nA V ppm/C KHz 7/14 Typical performance characteristics ST763A series 6 Figure 4. Typical performance characteristics (Unless otherwise specified TJ = 25C) Output voltage vs temperature Figure 5. Output voltage vs input voltage Figure 6. Reference voltage vs temperature Figure 7. Efficiency vs temperature Figure 8. Efficiency vs output current Figure 9. LX leakage current vs temperature 8/14 ST763A series Typical performance characteristics Figure 10. LX ON Resistance vs temperature Figure 11. Shutdown input threshold vs temperature Figure 12. Shutdown input leakage current vs Figure 13. Oscillator frequency vs temperature temperature Figure 14. Oscillator frequency vs input voltage Figure 15. Switching waveform, continuous conduction VI = 6V, IO = 250mA 9/14 Package mechanical data ST763A series 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 10/14 ST763A series Package mechanical data SO-8 MECHANICAL DATA DIM. A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 mm. MIN. 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 0.228 0.010 0.016 TYP MAX. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 MIN. 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.244 0.020 0.050 inch TYP. MAX. 0.069 0.010 0.065 0.020 0.010 0.197 0.157 8 (max.) 0.04 0016023/C 11/14 Package mechanical data ST763A series Tape & Reel SO-8 MECHANICAL DATA mm. DIM. MIN. A C D N T Ao Bo Ko Po P 8.1 5.5 2.1 3.9 7.9 12.8 20.2 60 22.4 8.5 5.9 2.3 4.1 8.1 0.319 0.216 0.082 0.153 0.311 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.335 0.232 0.090 0.161 0.319 MIN. TYP. MAX. 12.992 0.519 inch 12/14 ST763A series Revision history 8 Table 5. Date Revision history Revision history Revision 2 3 Changes Add TA row fOSC on table 4 and new template. Order code has been updated. 26-May-2006 29-May-2007 13/14 ST763A series Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZE REPRESENTATIVE OF ST, ST PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS, WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2007 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 14/14 |
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