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| 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 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 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 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. Applications Consumer: STB, DVD, TV, VCR, car radio, LCD monitors Networking: XDSL, modems, DC-DC modules Computer: printers, audio/graphic cards, optical storage, hard disk drive Industrial: changers, car battery, DC-DC converters Figure 1. Test application circuit 3.3V VIN = 4.4V to 35V VREF VCC SYNC. C1 10F 35V CERAMIC COMP C4 22nF C3 220pF R3 4.7K 6 8 2 4 INH 1 OUT L1 15H D1 STPS340U 5 FB GND R2 3.3K VOUT=3.3V L5973D 3 7 R1 5.6K C2 330F 10V D03IN1439 January 2008 Rev 16 1/17 www.st.com 17 Contents L5973D 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 8 9 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Application ideas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 L5973D Pin settings 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 Type OUT SYNC 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 1.23 V. An external resistive divider is required for higher output voltages. 3.3 V VREF. No cap is requested for stability. Ground. Unregulated DC input voltage. Description 3/17 Electrical data L5973D 2 2.1 Electrical data Maximum ratings Table 2. Symbol V8 V1 I1 V4, V5 V3 V2 PTOT TJ TSTG Input voltage Output DC voltage Output peak voltage at t = 0.1 s Maximum output current Analog pins INH SYNC Power dissipation at TA 60 C Operating junction temperature range Storage temperature range Absolute maximum ratings Parameter Value 40 -1 to 40 -5 to 40 int. limit. 4 -0.3 V to VCC -0.3 to 4 2.25 -40 to 150 -55 to 150 V W C C V Unit V V V 2.2 Thermal data Table 3. Symbol RthJA Thermal data Parameter Maximum thermal resistance junction-ambient HSOP8 Exposed Pad 40 (1) Unit C/W 1. Package mounted on board 4/17 L5973D Electrical characteristics 3 Electrical characteristics Table 4. Symbol VCC RDS(on) Il fs Electrical characteristics ( TJ = 25 C, VCC = 12 V, unless otherwise specified) Parameter Operating input voltage range Mosfet on Resistance Maximum limiting current Switching frequency 225 Duty cycle 0 250 275 100 kHz % VCC = 4.4 V to 36 V (1) Test condition Vo = 1.235 V; Io = 2 A (1) Min 4 Typ Max 36 Unit V A kHz (1) 0.250 2.5 212 3 250 0.5 3.5 280 Dynamic characteristics (see test circuit ). V5 h Voltage feedback Efficiency 4.4 V < VCC < 36 V, 20 mA < IO < 2 A VO = 5 V, VCC = 12 V 1.220 (1) 1.235 1.235 90 1.25 1.272 V V % 1.198 DC characteristics Iqop Iq Total operating quiescent current Quiescent current Duty Cycle = 0; VFB = 1.5 V Vinh > 2.2 V VCC = 36 V; Vinh > 2.2 V (1) (1) (1) 3 5 2.5 mA mA A A 50 80 100 150 Iqst-by Total stand-by quiescent current Inhibit INH threshold voltage Error amplfier VOH VOL Io source Io sink High level output voltage Low level output voltage Source output current Sink output current VFB = 1 V VFB = 1.5 V VCOMP = 1.9 V; VFB = 1 V VCOMP = 1.9 V; VFB = 1.5 V 200 1 300 1.5 3.5 0.4 V V A mA Device ON Device OFF 2.2 0.8 V V 5/17 Electrical characteristics Table 4. Symbol Ib L5973D Electrical characteristics (continued) ( TJ = 25 C, VCC = 12 V, unless otherwise specified) Parameter Source bias current DC open loop gain RL = Icomp = -0.1 mA to 0.1 mA VCOMP = 1.9 V 50 Test condition Min Typ 2.5 57 2.3 Max 4 Unit A dB mS gm Transconductance Sync function High input voltage Low input voltage Slave sink current Master output amplitude Output pulse width Reference section Reference voltage IREF = 0 to 5 mA VCC = 4.4 V to 36 V Line regulation Load regulation Short circuit current IREF = 0 mA VCC = 4.4 V to 36 V IREF = 0 to 5 mA 10 (1) VCC = 4.4 V to 36 V VCC = 4.4 V to 36 V Vsync = 0.74 V Vsync = 2.33 V Isource = 3 mA no load, Vsync = 1.65 V (2) 2.5 VREF 0.74 V V mA mA V s 0.11 0.21 2.75 0.20 3 0.35 0.25 0.45 3.234 3.2 3.3 3.3 5 8 18 3.366 3.399 10 15 30 V V mV mV 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. 6/17 L5973D Typical characteristics 4 Typical characteristics Figure 3. Vo (V) 3.312 3.308 3.304 3.3 3.296 3.292 3.288 3.284 3.28 3.276 0 10 20 Vcc (V) 30 40 Vcc = 12V Vo = 3.3V Tj = 25C Line regulation Figure 4. Ishd (A) 70 Shutdown current vs junction temperature 60 Vcc = 12V 50 Tj = 125C 40 30 -50 0 50 Tj (C) 100 150 Figure 5. Vo (V) 1.25 1.24 Output voltage vs junction temperature Figure 6. Switching frequency vs junction temperature Fsw (KHz) 260 250 1.23 240 1.22 Vcc = 12V 1.21 1.2 -50 0 50 Tj (C) 100 150 Vcc=12V 220 -50 0 50 Tj (C) 100 150 230 Vcc = 12V Vo = 3.3V Figure 7. Iq (mA) Quiescent current vs junction temperature 2 1.8 1.6 Vcc = 12V DC = 0% 1.4 1.2 -50 0 50 Tj (C) 100 150 7/17 Typical characteristics L5973D Figure 8. Junction temperature vs output current Figure 9. Junction temperature vs output current Tj(C) 120 110 Vin=5V 100 Tamb=25C 90 80 70 60 50 40 30 20 0.2 0.4 0.6 0.8 1 Tj (C) 120 Vo=3.3V Vo=2.5V 110 100 90 80 70 60 50 40 30 20 Vin=12V Tamb=25C Vo=5V Vo=3.3V Vo=1.8V Vo=2.5V 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 Io(A) 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 Io (A) 2 2.2 2.4 2.6 Figure 10. Efficiency vs output current Figure 11. Efficiency vs output current 95 93 91 89 87 85 83 81 79 77 75 73 71 69 67 Vo=3.3V Vo=2.5V Vo=1.8V Vin=5V 91 89 87 85 83 81 79 77 75 73 71 69 67 65 Vo=5V Vo=3.3V Vo=2.5V Efficiency (%) Efficiency (%) Vin=12V 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 Io (A) 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 Io (A) 8/17 L5973D Application circuit 5 Application circuit In figure 6 is shown the demonstration board application circuit, where the input supply 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 3.3V VIN = 4.4V to 25V VREF VCC SYNC. 6 8 2 4 INH 1 OUT L1 15H D1 STPS2L25U VOUT=3.3V L5973D 3 7 5 FB GND R1 5.6K C1 10F 25V CERAMIC COMP C4 22nF C3 220pF R3 4.7K C2 330F 6.3V R2 3.3K D03IN1440 Table 5. Component list Part number GRM32DR61E106KA12L POSCAP 6TPB330M C1206C221J5GAC C1206C223K5RAC Description 10 F, 25 V 330 F, 6.3 V 220 pF, 5%, 50 V 22 nF, 10%, 50 V 5.6 K, 1%, 0.1 W 0603 3.3 K, 1%, 0.1 W 0603 4.7 K, 1%, 0.1 W 0603 STPS2L25U DO3316P-153 2 A, 25 V 15 H, 3 A Manufacturer Murata Sanyo KEMET KEMET Neohm Neohm Neohm ST COILCRAFT Reference C1 C2 C3 C4 R1 R2 R3 D1 L1 9/17 Application circuit Figure 13. PCB layout (component side) L5973D Figure 14. PCB layout (bottom side) Figure 15. PCB layout (front side) Below some graphs show the TJ versus output current in different conditions of the input and output voltage and some efficiency measurements. 10/17 L5973D Application ideas 6 Application ideas Figure 16. Positive buck-boost regulator Figure 17. Buck-boost regulator Figure 18. Dual output voltage with auxiliary winding 11/17 Application ideas L5973D 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 = VFB - [(VREF - VFB)x(R2 / R1)] If the load is not present, a resistor connected between VOUT and GND is required in order to avoid that the voltage across COUT 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 R2. Figure 19. Output voltage below the 1.235 V internal voltage reference 12/17 L5973D Package mechanical data 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 13/17 Package mechanical data Table 6. Dim Min A A1 A2 b c D D1 E E1 E2 e h L k ccc 0.25 0.40 0.00 1.25 0.31 0.17 4.80 3 5.80 3.80 2.31 4.90 3.1 6.00 3.90 2.41 1.27 0.50 1.27 0.0098 0.0157 0.51 0.25 5.00 3.2 6.20 4.00 2.51 Typ Max 1.70 0.10 0.0492 0.0122 0.0067 0.1890 0.118 0.2283 0.1496 0.091 0.095 0.1929 0.122 0.00 Min Typ L5973D HSOP8 mechanical data mm inch Max 0.0669 0.0039 0.0201 0.0098 0.1969 0.126 0.2441 0.1575 0.099 0.0197 0.0500 0 (min), 8 (max) 0.10 0.0039 Figure 20. Package dimensions 14/17 L5973D Order code 8 Order code Table 7. Order code Part number L5973D L5973D013TR Package HSOP8 (Exposed pad) HSOP8 (Exposed pad) Packaging Tube Tape and reel 15/17 Revision history L5973D 9 Revision history Table 8. Date 01-Nov-2005 22-May-2006 13-Nov-2006 26-Jan-2007 17-Oct-2007 24-Oct-2007 07-Jan-2008 pp Revision history Revision 10 11 12 13 14 15 16 Changes Updated package information Electrical characteristic Table 4 updated, new application idea Figure 19 added, new template Typo in order codes Updated Table 4 on page 5 Updated Section 5: Application circuit on page 9 Updated Table 6 on page 14 Updated Table 6 on page 14 16/17 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 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. 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