ST L5973D Manual
Contents
1. 0 74 V 2 0 11 0 25 mA Slave sink current Sync Vsync 2 33 V 0 21 0 45 mA Master output amandes lsource 3 MA 2 75 3 V no load Output pulse width Veyne 1 65 V 0 20 0 35 us Reference section Reference voltage 3 234 3 3 3 366 V Joer 0 to 5 mA 1 3 2 3 3 13 399 V Voc 24 4 V to 36V A E IREF 0mA Line regulation 5 10 mV 9 Voc 4 4 V to 36 V Load regulation Iper 0 to 5 mA 8 15 mV Short circuit current 10 18 30 mA 1 Specification Referred to Tj from 40 to 125 C Specification over the 40 to 125 Tj Temperature range are assured by design characterization and statistical correlation 2 Guaranteed by design Dy L5973D Typical characteristics 4 Typical characteristics Figure 3 Line regulation Figure 4 Shutdown current vs junction temperature Vo V Ishd uA 3 312 70 3 308 1 Vcc 12V _Vo 3 3V Tj 25 C 3 304 60 3 3 A Vcc 12V 3 296 3 292 NW _ Tj 125 G 3 288 3 284 40 3 28 3 276 30 0 10 20 30 40 50 0 50 100 150 Vcc V Tj C Figure 5 Output voltage vs junction Figure 6 Switching frequency vs temperature junction temperature V i Fsw KHz j 260 1 24 250 1 23 240 1 22. GI L5973D 2 5 A switch step down switching regulator Features 2 5 A internal switch Operating input voltage from 4 V to 36 V 3 3 V 2 reference voltage 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 Applications m Consumer STB DVD TV VCR car radio LCD monitors Networking XDSL modems DC DC modules m Computer printers audio graphic cards optical storage hard disk drive m industrial changers car battery DC DC converters Figure 1 Test application circuit HSOP8 exposed pad Description The L5973D is a step down monolithic power switching regulator with a minimum switch current limit of 2 5 A so it is able to deliver more than 2 A DC current to the load depending on the application conditions The output voltage can be set from 1 235 V to 35 V The high current level is also achieved thanks to an SO8 package with exposed frame that allows to reduce the Rth j amb down to approximately 40 C W The device uses an internal P channel D MOS transistor with a typical Rdson of 250 mO as switching element to minimize the size of the external components An internal oscillator fixes the switching frequency at 250 kHz
3. up disable the device 4 COMP E A output for frequency compensation Feedback input Connecting directly to this pin results in an output 5 FB voltage of 1 23 V An external resistive divider is required for higher output voltages 6 VREF 3 3 V Vrerf No cap is requested for stability 7 GND Ground 8 VCC Unregulated DC input voltage 3 17 Electrical data L5973D 2 Electrical data 2 1 Maximum ratings Table 2 Absolute maximum ratings Symbol Parameter Value Unit Vg Input voltage 40 V V Output DC voltage 1 to 40 V Output peak voltage at t 0 1 us 5 to 40 V l4 Maximum output current int limit Va V5 Analog pins 4 V Va INH 0 3 V to Voc Vo SYNC 0 3 to 4 V ProT Power dissipation at TA x 60 C 2 25 Tj Operating junction temperature range 40 to 150 C Tera Storage temperature range 55 to 150 C 2 2 Thermal data Table 3 Thermal data Symbol Parameter beige Unit mbo y Exposed Pad Dua Maximum thermal resistance junction ambient 40 U C W 1 Package mounted on board 417 ky L5973D Electrical characteristics 3 d Electrical characteristics Table 4 Electrical characteristics Ty 25 C Mee 12 V unless otherwise specified Symbol Parameter Test condition Min Typ Max Unit Ves operating input Vo 1 235Vil 2A
4. 2 Voc 12V 230 Vcc 12V 121 Vo 3 3V 220 12 LLL LL _ __ 50 0 50 100 150 50 0 50 100 150 Ti Co Tj CC Figure 7 Quiescent current vs junction temperature Iq mA 2 1 8 1 6 TI ToL Vcc 12V 14 GC 1 2 50 0 50 100 150 Tj CC ky 7 17 Typical characteristics L5973D 8 17 Figure 8 Junction temperature vs Figure 9 Junction temperature vs output current output current Tj C Tj C 120 120 MOT Vin sv Vo 83V A No 2 5 TW noa VV A uaaa 100 Tamb 25 C 100 1 Tamb 25 C 90 90 80 80 Vo 2 5V 70 70 60 60 50 50 40 40 30 30 20 20 0 2 0 4 0 6 0 8 1 1 2 1 4 1 6 1 8 2 2 2 2 4 2 6 02 04 06 08 1 12 14 16 18 2 22 24 26 lo A Figure 10 Efficiency vs output current Figure 11 Efficiency vs output current pa 91 93 e E Vo 3 3V 87 m Bes Vo 2 5V pei Vo 3 3V 3 79 1 8V i 7T Vo 2 5V 77 e E 75 73 7 Vin 12V 73 S ine 71 HH inss a n 69 67 67 65 0 1 0 3 0 5 07 0 9 1 1 13 15 17 19 21 23 lo A 0 1 0 3 0 5 0 7 0 9 1 1 1 3 15 1 7 1 9 2 1 23 d L5973D Application circuit 5 d Application circuit In figure 6 is shown the demonstration board application circuit where the input suppl
5. 2005 10 Updated package information 22 May 2006 11 ui updated new application idea 13 Nov 2006 12 Typo in order codes 26 Jan 2007 13 Updated Table 4 on page 5 17 Oct 2007 14 Updated Section 5 Application circuit on page 9 24 Oct 2007 15 Updated Table 6 on page 14 07 Jan 2008 16 Updated Table 6 on page 14 16 17 ky L5973D 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 int
6. 4 36 V voltage range Mosfet on 1 Ros on Resistance Beat e S l Magnum milita yia eY 25 3 35 A current 0 212 250 280 kHz fs Switching frequency 225 250 275 kHz Duty cycle 0 100 Dynamic characteristics see test circuit 4 4 V lt Voc lt 36 V 1 220 1 235 125 V V5 Voltage feedback 20mA lo 2A 0 1 198 1 235 1272 V h Efficiency Vo 25V Voc 12V 90 DC characteristics Total operating 1 oe quiescent current B 5 mA c Duty Cycle 0 la Quiescent current Ves s 15 V 2 5 mA Vinh gt 2 2 V 1 50 100 pA Total stand by V s qst by E quiescent current CC 1 Vi 2 2 V 80 150 uA Inhibit INH threshold Device ON 0 8 V voltage Device OFF 2 2 V Error amplfier Vs High level output VFB 1V 3 5 V voltage VoL Low level output VFB 15V 0 4 V voltage Source output Vcomp 1 9 V lo source current est 200 300 uA d Vcomp 1 9 V lo sink Sink output current Ve ss 1 5 V 1 1 5 mA 5 7 Electrical characteristics L5973D 6 17 Table 4 Electrical characteristics continued Ty 25 C Voc 12 V unless otherwise specified Symbol Parameter Test condition Min Typ Max Unit lp Source bias current 2 5 4 uA DC open loop gain R 50 57 dB lcomp 0 1 MA to gm Transconductance 0 1 mA 2 3 mS Sync function High input voltage Voc 4 4 V to 36 V 2 5 VREF V Low input voltage Voc 4 4 V to 36 V 0 74 V Vayne
7. Having a minimum input voltage of 4 V only it is particularly suitable for 5 V bus available in all computer related applications Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection VREF 3 3V o O VIN lt AN to 35V VCC O C1 10uF 35V CERAMIC DOSIN1439 January 2008 Rev 16 1 17 www st com Contents L5973D Contents 1 Pin setings i i i cy Re i a RTE T 3 1 1 Pin connection 3 1 2 Pin description sdk hu se E eg Sew keen ee Sear eae ke Seen se hee ee ENAS 3 2 Electrical Gale WEE 4 2 1 Maximum dl e CEET A 2 2 Thermal data i ai a A A A A 4 3 Electrical characteristics 5 4 Typical characteristics ccesi erica 7 5 Application circuit est x wax RARE RR 9 6 Application ideas aridi einen ee acme ae 11 7 Package mechanical data 0 13 8 Order GOEN RARE RR RR RR RE RS nanak 15 9 REVISION history e ss i ei ll RRE ENN EN 16 2 17 IST L5973D Pin settings 1 1 1 2 Pin settings Pin connection Figure 2 Pin connection top view OUT VCC SYNC GND INH VREF COMP FB D98IN955 Pin description Table 1 Pin description N Type Description 1 OUT Regulator output 2 SYNC Master slave synchronization A logical signal active high disables the device If INH not used the pin 3 INH must be grounded When it is open an internal pull
8. age with auxiliary winding D2 VOUTI 5V Ni N2 2 1N4148 50mA tO Di VIN 12V Le Lp 22uH o le e VOUT 3 3V Di A 0 54 STPS25L25U C4 c5 SUE m 100uF ATuF 25V 10V uum T UV Ceramic L d 11 17 Application ideas L5973D 12 17 When an output voltage below the internal reference 1 235 V is required the circuit reported in the figure 18 can been used In this case the minimum voltage reachable is 0 6 V and can be easily calculated with the following formula Vout Vre Vrer Vep x R2 R4 If the load is not present a resistor connected between Voyr and GND is required in order to avoid that the voltage across Cour increases The value of this resistor has to be calculated taking into account that the current flowing through this resistance has to be higher than the current flowing through Ro Figure 19 Output voltage below the 1 235 V internal voltage reference V Sync L1 15uH Vour SC L EC our MNNO aa cr dici AE ft 330ur Se iv CERAMIC i aT a STPS2L25U Z ois 220pF L5973D Package mechanical data 7 Package mechanical data In order to meet environmental requirements ST offers these devices in ECOPACK 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 bo
9. ellectual 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 pro
10. perty of their respective owners 2008 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 17 17 d
11. x 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 ky 13 17 Package mechanical data L5973D Table 6 HSOP8 mechanical data mm inch Dim Min Typ Max Min Typ Max A 1 70 0 0669 A1 0 00 0 10 0 00 0 0039 A2 1 25 0 0492 b 0 31 0 51 0 0122 0 0201 C 0 17 0 25 0 0067 0 0098 D 4 80 4 90 5 00 0 1890 0 1929 0 1969 DI 3 3 1 3 2 0 118 0 122 0 126 E 5 80 6 00 6 20 0 2283 0 2441 E1 3 80 3 90 4 00 0 1496 0 1575 E2 2 31 2 41 2 51 0 091 0 095 0 099 e 1 27 h 0 25 0 50 0 0098 0 0197 L 0 40 1 27 0 0157 0 0500 k 0 min 8 max ccc 0 10 0 0039 Figure 20 Package dimensions Exposed Pad E D1 3 1mm A2 E2 2 41mm E2 oE E E 35 i 3 e oo Y uM I n ET CG lt LH SEATING PLANE c ccc Ji 7195016 C 14 17 ky L5973D Order code 8 Order code Table 7 Order code Part number Package Packaging L5973D HSOP8 Exposed pad Tube L5973D013TR HSOP8 Exposed pad Tape and reel 15 17 Revision history L5973D 9 Revision history Table 8 Revision history Date Revision Changes 01 Nov
12. y voltage Vcc can range from 4 V to 25 V due to the rated voltage of the input capacitor and the output voltage is adjustable from 1 235 V to Vcc Figure 12 Demonstration board application circuit VIN lt 4V to 25V O C2 330uF C1 6 3V 10uF 25V CERAMIC D03IN1440 Table 5 Component list Reference Part number Description Manufacturer CI GRM32DR61E106KA12L 10 uF 25 V Murata C2 POSCAP 6TPB330M 330 uF 6 3 V Sanyo C3 C1206C221J5GAC 220 pF 596 50 V KEMET C4 C1206C223K5RAC 22 nF 1096 50 V KEMET R1 5 6 K 1 0 1 W 0603 Neohm R2 3 3 K 1 0 1 W 0603 Neohm R3 4 7 K 1 0 1 W 0603 Neohm D1 STPS2L25U 2A 25V ST L1 DO3316P 153 15 uH 3A COILCRAFT 9 17 Application circuit L5973D L5973D Application ideas 6 Application ideas Figure 16 Positive buck boost regulator L1 D2 VIN 5V Ve OUT 15uH STPS2L26U VOUT 12V 0 8A o LIA 24k C1 i CH 10uF ER 100uF 10v c2 Toa T STNANED3L mum 16 Ceramic 220pF 22nF 2 7k R3 4 7k 4 T Figure 17 Buck boost regulator L1 15uH VIN 5V OUT o e eg AE A DI STPS2L25U FB 27k VOUT 12V 0 6A C1 C2 wem T C He OuF m O mam 10V 25V C3 mem Ge p Ceramic Ceramic 220pF 24k gt 100u R3 16V 47k d e L Figure 18 Dual output volt
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ST L5973D Manual