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| A5970D 1.5A 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 -40 C to 85 C Up to 1 A DC output current Operating input voltage from 4.4 V to 36 V Output voltage adjustable from 1.235 V to 35 V Low dropout operation: 100 % duty cycle 250 kHz Internally fixed frequency Voltage feedforward Zero load current operation Internal current limiting Inhibit for zero current consumption Synchronization Protection against feedback disconnection Thermal shutdown SO-8 Description The A5970D is a step down monolithic power switching regulator capable to deliver up to 1 A at output voltages from 1.2 V to 35 V. The device uses an internal P-channel D-MOS transistor (with a typical Rdson of 250 m) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250 kHz. Having a minimum input voltage of 4.4 V only, it is particularly suitable for 5 V bus. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection. Applications Dedicated to automotive applications Typical application Figure 1. L1 33uH VIN=4.4V to 35V VCC COMP C4 C1 10uF 35V CERAMIC C3 220pF R3 4k7 22nF 8 4 1 2 OUT SYNCH Vout=3.3V A5970D FB 6 5 7 GND INH 3 D1 STPS340U R1 5k6 C2 100uF 10V R2 3k3 VREF 3.3V October 2007 Rev 2 1/13 www.st.com 1 Contents A5970D Contents 1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 1.2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 2.2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 4 5 6 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2/13 A5970D 1 1.1 Pin settings Pin connection Figure 2. Pin connection (top view) OUT SYNC INH COMP 1 2 3 4 D98IN955 8 7 6 5 VCC GND VREF FB 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 3/13 Electrical data A5970D 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 0.75 -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 120 (1) Unit C/W 1. Package mounted on board 4/13 A5970D 3 Electrical characteristics Table 4. Symbol VCC RDS(on) IL fSW Electrical characteristics (TJ=-40 to 85C, VCC = 12V, unless otherwise specified) Parameter Operating input voltage range Mosfet on resistance Maximum limiting current Switching frequency Duty cycle VCC=5V; 1.5 212 0 Test condition V0=1.235V; I0=1A Min 4.4 0.250 1.87 250 Typ Max 36 0.5 2.25 280 100 Unit V A kHz % Dynamic characteristics (see test circuit). V5 Voltage feedback Efficiency 4.4V Vinh > 2.2V Total stand-by quiescent VCC=36V; current Vinh > 2.2V 5/13 Electrical characteristics Table 4. 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 Vsynch= 2.33V (1) A5970D Electrical characteristics (TJ=-40 to 85C, VCC = 12V, unless otherwise specified) 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 Master output amplitude Isource= 3mA Output pulse width Reference section Reference voltage Line regulation Load regulation Short circuit current 1. Guaranteed by design no load, Vsynch= 1.65V IREF = 0 to 5mA VCC = 4.4V to 36V IREF = 0mA VCC = 4.4V to 36V IREF = 0mA 3.2 3.3 5 8 3.399 10 15 30 V mV mV mA 10 18 6/13 A5970D 4 Typical characteristics Figure 3. Tj(C) Junction temperature vs. output current Figure 4. Vo (V) 3.312 Load regulator 130 120 110 100 90 80 70 60 50 40 30 20 0.2 Vo=3.3V Vo=2.5V 3.308 3.304 3.3 3.296 3.292 3.288 3.284 3.28 3.276 Vcc = 12V Vo = 3.3V Tj = 25C Vcc=5V Tamb=25C Vo=1.8V Tj = 125C 0.4 0.6 0.8 Io(A) 1 1.2 1.4 1.6 0 0.5 Io (A) 1 1.5 Figure 5. Tj(C) Junction temperature vs. output current Figure 6. Vo (V) 3.312 Line regulator 130 120 110 100 90 80 70 60 50 40 30 20 0.2 Vo=5V Vcc=12V Tamb=25C Vo=3.3V 3.308 3.304 3.3 3.296 3.292 3.288 3.284 3.28 3.276 Vcc = 12V Vo = 3.3V Tj = 25C Vo=2.5V Tj = 125C 0.4 0.6 0.8 Io(A) 1 1.2 1.4 1.6 0 10 20 Vcc (V) 30 40 Figure 7. Junction temperature vs. output current Figure 8. Vo (V) 1.25 Output voltage vs. junction temperature Tj(C) 140 120 100 80 60 40 20 0 0.2 Vcc=24V Tamb=25C Vo=18V Vo=12V 1.24 Vo=5V 1.23 1.22 Vcc = 12V 1.21 1.2 Vcc=12V 0.4 0.6 0.8 Io(A) 1 1.2 1.4 -50 0 50 Tj (C) 100 150 7/13 Typical characteristics A5970D Figure 9. Iq (mA) Quiescent current vs. junction temperature Figure 10. Switching frequency vs. junction temperature Fsw (KHz) 260 2 1.8 250 1.6 Vcc = 12V DC = 0% 240 1.4 230 Vcc = 12V Vo = 3.3V 1.2 -50 0 50 Tj (C) 100 150 220 -50 0 50 Tj (C) 100 150 Figure 11. Shutdown current vs.junction Figure 12. Efficiency vs. output current temperature Ishd (A) 70 Vcc = 12V Efficiency (%) 60 50 40 30 -50 0 50 Tj (C) 100 150 94 92 90 88 86 84 82 80 78 76 74 72 70 0.1 Vo=3.3V Vo=2.5V Vo=1.8V Vcc=5V 0.2 0.3 0.4 0.5 0.6 Io (A) 0.7 0.8 0.9 1 Figure 13. Efficiency vs. output current 92 90 88 86 84 82 80 78 76 74 72 70 Vo=5V Vo=3.3V Efficiency (%) Vo=2.5V Vcc=12V 0.1 0.2 0.3 0.4 0.5 0.6 Io (A) 0.7 0.8 0.9 1 8/13 A5970D 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 9/13 Package mechanical data A5970D Table 5. Dim. SO-8 mechanical data mm. Min Typ Max 1.75 Min 0.053 inch Typ Max 0.069 A 1.35 A1 A2 B C D 0.10 1.10 0.33 0.19 4.80 3.80 1.27 5.80 0.25 0.40 0.25 1.65 0.51 0.25 5.00 4.00 0.004 0.043 0.013 0.007 0.189 0.15 0.050 0.010 0.065 0.020 0.010 0.197 0.157 (1) E e H h L k ddd 6.20 0.50 1.27 0.228 0.010 0.016 0.244 0.020 0.050 0 (min.), 8 (max.) 0.10 0.004 1. Dimensions D does not include mold flash, protru-sions or gate burrs. Mold flash, potrusions or gate burrs shall not exceed 0.15mm (.006inch) in total (both side). Figure 14. Package dimensions 10/13 A5970D 6 Order codes Table 6. Order code Order code A5970D SO-8 A5970D13TR Tape and reel Package Packing Tube 11/13 Revision history A5970D 7 Revision history Table 7. Date 06-Aug-2007 24-Oct-2007 Document revision history Revision 1 2 Initial release. Updated: Table 4 on page 5 Changes 12/13 A5970D 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 13/13 |
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