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| A5973D 2.5A switch step down switching regulator for automotive applications Features Qualified following the AEC-Q100 requirements (temperature Grade 3), see PPAP for more details. Temperature range -40C to 85C 2A DC output current Operating input voltage from 4V to 36V 3.3V / (2%) reference voltage Output voltage adjustable from 1.235V to 35V Low dropout operation: 100% duty cycle 250kHz Internally fixed frequency Voltage feedforward Zero load current operation Internal current limiting Inhibit for zero current consumption Synchronization Protection against feedback disconnection Thermal shutdown HSOP8 exposed pad Description The A5973D is a step down monolithic power switching regulator with a minimum switch current limit of 2.5A so it is able to deliver more than 2A DC current to the load depending on the application conditions. The output voltage can be set from 1.235V to 35V. The high current level is also achieved thanks to an SO8 package with exposed frame, that allows to reduce the Rth(JA) down to approximately 40C/W. The device uses an internal P-channel D-MOS transistor (with a typical Rdson of 250m) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250kHz. Having a minimum input voltage of 4V only, it is particularly suitable for 5V bus. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection. L1 15uH Applications Dedicated to automotive applications Figure 1. Typical application VCC COMP C4 VIN=4V to 35V 8 4 1 2 OUT SYNCH Vout=3.3V A5973D FB 6 5 7 GND INH 3 D1 STPS340U R1 5k6 C2 330uF 6.3V R2 3k3 C1 10uF 35V CERAMIC C3 220pF 22nF R3 4k7 VREF 3.3V October 2007 Rev 2 1/14 www.st.com 1 A5973D Contents Contents 1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1 1.2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1 2.2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 4 5 6 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1/14 A5973D Pin settings 1 1.1 Pin settings Pin connection Figure 1. Pin connection (top view) 1.2 Pin description Table 1. N 1 2 3 4 5 6 7 8 Pin description Pin OUT SYNCH INH COMP FB VREF GND VCC Regulator output. Master/slave synchronization. A logical signal (active high) disables the device. If INH not used the pin must be grounded. When it is open an internal pull-up disable the device. E/A output for frequency compensation. Feedback input. Connecting directly to this pin results in an output voltage of 1.23V. An extenal resistive divider is required for higher output voltages. 3.3V VREF. No cap is requested for stability. Ground. Unregulated DC input voltage. Description 3/14 A5973D Electrical data 2 2.1 Electrical data Maximum ratings Table 2. Symbol V8 V1 I1 V4 , V5 V3 V2 PTOT TJ TSTG Input voltage OUT pin DC voltage OUT pin peak voltage at t=0.1s Maximum output current Analog pins INH SYNCH Power dissipation at TA 70C Operating junction temperature range Storage temperature range Absolute maximum ratings Parameter Value 40 -1 to 40 -5 to 40 int. limit. 4 -0.3 to VCC -0.3 to 4 2.25 -40 to 150 -55 to 150 V V V W C C Unit V V V 2.2 Thermal data Table 3. Symbol RthJA Thermal data Parameter Maximum thermal resistance junction-ambient SO8 40 (1) Unit C/W 1. Package mounted on board 4/14 A5973D Electrical characteristics 3 Electrical characteristics Table 4. Electrical characteristics (TJ=-40C to 85C, VCC = 12V, unless otherwise specified) Symbol VCC RDS(on) IL fSW Parameter Operating input voltage range MOSFET on resistance Maximum limiting current Switching frequency Duty cycle Dynamic characteristics (see test circuit) V5 Voltage feedback Efficiency 4.4V Vinh > 2.2V Total stand-by quiescent VCC=36V; current Vinh > 2.2V Io sink Sink output current mA 5/14 A5973D Electrical characteristics Table 4. Electrical characteristics (TJ=-40C to 85C, VCC = 12V, unless otherwise specified) Symbol Synch function High input voltage Low input voltage Slave synch current VCC= 4.4 to 36V; VCC= 4.4 to 36V; Vsynch= 0.74V(1) Vsynch= 2.33V Master output amplitude Isource= 3mA Output pulse width Reference section Reference voltage IREF = 0 to 5mA VCC = 4.4V to 36V Line regulation Load regulation Short circuit current 1. Guarantee by design Parameter Test condition Min Typ Max Unit 2.5 VREF 0.74 V V mA V s 0.11 0.21 2.75 0.20 3 0.35 0.25 0.45 no load, Vsynch= 1.65V 3.2 3.3 3.399 V IREF = 0mA VCC = 4.4V to 36V IREF = 0mA 10 5 8 18 10 15 35 mV mV mA 6/14 A5973D Typical characteristics 4 Typical characteristics Figure 2. Line regulatior Figure 3. Output voltage vs. junction temperature Figure 4. Quiescent current vs. junction temperature Figure 5. Shutdown current vs. junction temperature 7/14 A5973D Figure 6. Switching frequency vs junction temperature Figure 7. Typical characteristics Junction temperature vs. output current Figure 8. Junction temperature vs. output current Figure 9. Efficiency vs. output current Figure 10. Efficiency vs. output current 8/14 A5973D Package mechanical data 5 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 9/14 A5973D Package mechanical data Table 5. Dim HSOP8 mechanical data mm Min Typ Max 1.70 0.00 1.25 0.31 0.17 4.80 5.80 3.80 4.90 6.00 3.90 1.27 0.25 0.40 0.50 1.27 0.0098 0.0157 0.0197 0.0500 0.51 0.25 5.00 6.20 4.00 0.10 0.0492 0.0122 0.0067 0.1890 0.2283 0.1496 0.1929 0.0201 0.0098 0.1969 0.2441 0.1575 0.00 Min inch Typ Max 0.0669 0.0039 A A1 A2 b c D E E1 e h L k ccc 0 (min), 8 (max) 0.10 0.0039 Figure 11. Package dimensions 10/14 A5973D Order codes 6 Order codes Table 6. Order code Order code A5973D HSOP8 A5973D013TR Tape and reel Package Packing Tube 11/14 A5973D Revision history 7 Revision history Table 7. Date 06-Aug-2007 23-Oct-2007 Document revision history Revision 1 2 Initial release Updated: Table 4 on page 5, Table 5 on page 10 Changes 12/14 A5973D 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 AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, 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. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. 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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