LDS3985 Very low drop and low noise BiCMOS 300 mA voltage regulator Datasheet - production data - [CO = 2.2 F, CBYP = 33 nF and IO = 1 mA] * Logic-controlled electronic shutdown * Internal current and thermal limit * Low output voltage noise: 30 VRMS over 10 Hz to 100 kHz SOT23-5L * SVR of 55 dB at 1 kHz, 50 dB at 10 kHz * Temperature range: - 40 C to 125 C * Automotive grade product available in DFN6 package, temperature range: - 40 C to 85 C Features Description * Input voltage from 2.5 V to 6 V * Stable with low ESR ceramic capacitors * Very low dropout voltage (150 mV typ. at 300 mA load, 0.4 mV typ. at 1 mA load) * Very low quiescent current (85 A typ. at no load, 200 A typ. at 300 mA load; max.1.5 A in OFF mode) * Guaranteed output current up to 300 mA * Wide range of output voltages available on request: fixed from 1.25 V to 5 V with 100 mV step * Fast turn-on time: typ. 240 s The LDS3985 provides up to 300 mA, from 2.5 V to 6 V input voltage. It is stable with ceramic and high quality tantalum capacitor. The ultra low drop voltage, low quiescent current and low noise make it suitable for low power applications and battery-powered systems. Shutdown logic control function is available, this means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. Typical applications are mobile phones and similar battery-powered wireless systems, portable information appliances. Table 1. Device summary Packages DFN6 SOT23-5L DFN6 LDS3985M15R LDS3985PU15R Output voltage (automotive grade) LDS3985PU15RY 1.5 V LDS3985M18R LDS3985PU18RY 1.8 V LDS3985M25R LDS3985PU25RY 2.5 V LDS3985PU28RY 2.8 V LDS3985PU30RY 3.0 V LDS3985PU33RY 3.3 V LDS3985M28R LDS3985PU28R LDS3985M30R LDS3985M33R LDS3985PU33R LDS3985M50R February 2014 This is information on a product in full production. 5.0 V DocID11039 Rev 9 1/21 www.st.com 21 Contents LDS3985 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2/21 DocID11039 Rev 9 LDS3985 1 Diagram Diagram Figure 1. Schematic diagram DocID11039 Rev 9 3/21 Pin configuration 2 LDS3985 Pin configuration Figure 2. Pin connections (top view for SOT23-5L, and for DFN6) 627/ ')1 Table 2. Pin description Pin n for SOT23-5L Pin n for DFN6 Symbol 1 1 VI LDO input voltage. 2 5 GND Common ground. 3 6 VINH Inhibit input voltage: ON mode when VINH 1.2 V, OFF mode when VINH 0.4 V (do not leave it floating; it is not internally pulled down/up). 4 4 Bypass 5 3 VO - 2 N.C. 4/21 Name and function Bypass pin: an external capacitor to be connected (usually 10 nF) to minimize noise voltage LDO output voltage Not connected. DocID11039 Rev 9 LDS3985 3 Maximum ratings Maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit (1) VI DC input voltage VO DC output voltage -0.3 to VI + 0.3 V Inhibit input voltage -0.3 to VI + 0.3 V VINH -0.3 to 6 IO Output current Internally limited PD Power dissipation Internally limited TSTG TOP V Storage temperature range -65 to 150 C Operating junction temperature range -40 to 125 C Operating junction temperature range, automotive grade version - 40 to 85 C 1. The input pin is able to withstand non repetitive spike of 6.5 V for 200 ms. Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 4. Thermal data Symbol Parameter SOT23-5L DFN6 Unit RthJC Thermal resistance junction-case 81 10 C/W RthJA Thermal resistance junction-ambient 255 55 C/W DocID11039 Rev 9 5/21 Electrical characteristics 4 LDS3985 Electrical characteristics TJ = 25 C, VI = VO(NOM) + 0.5 V, CI = 1 F, CO = 2.2 F, CBYP = 33 nF, IO = 1 mA, VINH = 1.4 V, unless otherwise specified. Table 5. LDS3985 electrical characteristics Symbol Parameter VI Operating input voltage VO Output voltage < 2.5 V VO Output voltage 2.5 V VO Line regulation(1) Test conditions Min. Typ. Max. Unit 2.5 6 V IO = 1 mA -50 50 TJ = - 40 to 125 C -75 75 IO = 1 mA -2 2 TJ= - 40 to 125 C -3 3 VI = VO(NOM) + 0.5 to 6 V, TJ = - 40 to 125 C -0.1 0.1 VO = 4.7 to 5 V -0.19 mV % VO(NOM) %/V 0.19 VO Load regulation IO = 1 mA to 300 mA, VO 2.5 V TJ = - 40 to 125 C 0.005 0.01 %/mA VO Load regulation IO = 1 mA to 300 mA, VO 2.5 V TJ = - 40 to 125 C 0.0008 0.004 %/mA VO Output AC line regulation(2) VI = VO(NOM) + 1 V, IO = 300 mA, tR = tF = 30 s 5 IO = 0 85 IQ Quiescent current ON mode: IO = 0, TJ = - 40 to 125 C VINH = 1.4 V IO = 0 to 300 mA mVPP 150 200 A IO = 0 to 300 mA, TJ = - 40 to 125 C 300 0.003 OFF mode: VINH = 0.4 V TJ = - 40 to 125 C IO = 1 mA 1.5 0.4 IO = 1 mA, TJ = - 40 to 125 C VDROP Dropout voltage(3) IO = 150 mA 2 60 mV IO = 150 mA, TJ = - 40 to 125 C IO = 300 mA 100 150 IO = 300 mA, TJ = - 40 to 125 C ISC SVR 6/21 250 Short-circuit current RL = 0 600 55 Supply voltage rejection f = 1 kHz VI = VO(NOM)+ 0.25 V VRIPPLE = 0.1 V, IO = 50 mA For VO(NOM) < 2.5 V, f = 10 kHz VI = 2.55 V DocID11039 Rev 9 mA dB 50 LDS3985 Electrical characteristics Table 5. LDS3985 electrical characteristics (continued) Symbol IO(PK) Parameter Peak output current Test conditions VO VO(NOM) - 5% Min. Typ. 300 550 Inhibit input logic low VINH Inhibit input logic high Max. Unit mA 0.4 VI = 2.5 V to 6 V, TJ= - 40 to 125 C V 1.4 IINH Inhibit input current VINH = 0.4 V, VI = 6 V 1 nA eN Output noise voltage BW = 10 Hz to 100 kHz, CO = 2.2 F 30 VRMS tON Turn-on time (4) CBYP = 33 nF 240 s Thermal shutdown (5) 160 C TSHDN Capacitance CO 2.2 22 F 5 5000 m Output capacitor ESR 1. For VO(NOM) < 2 V, VI = 2.5 V. 2. For VO(NOM) = 1.25 V, VI = 2.5 V. 3. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This specification does not apply to input voltages below 2.5 V. 4. Turn-on time is time measured between the enable input just exceeding VINH high value and the output voltage just reaching 95% of its nominal value. 5. Typical thermal protection hysteresis is 20 C. Table 6. LDS3985 (automotive grade) electrical characteristics Symbol Parameter VI Operating input voltage VO Output voltage < 2.5 V VO Output voltage 2.5 V VO Line regulation(1) Test conditions Min. Typ. Max. Unit 2.5 6 V IO = 1 mA -50 50 TJ = - 40 to 85 C -75 75 IO = 1 mA -2 2 TJ= - 40 to 85 C -3 3 VI = VO(NOM) + 0.5 to 6 V, TJ = - 40 to 85 C -0.1 0.1 VO = 4.7 to 5 V -0.19 mV % VO(NO M) %/V 0.19 VO Load regulation IO = 1 mA to 300 mA, VO 2.5 V TJ = - 40 to 85 C 0.005 0.01 %/mA VO Load regulation IO = 1 mA to 300 mA, VO 2.5 V TJ = - 40 to 85 C 0.0008 0.004 %/mA VO Output AC line regulation(2) VI = VO(NOM) + 1 V, IO = 300 mA, tR = tF = 30 s 5 DocID11039 Rev 9 mVPP 7/21 Electrical characteristics LDS3985 Table 6. LDS3985 (automotive grade) electrical characteristics (continued) Symbol Parameter Test conditions Min. IO = 0 Quiescent current ON mode: VINH = 1.4 V IQ Typ. Max. Unit 85 IO = 0, TJ = - 40 to 85 C 150 IO = 0 to 300 mA 200 A IO = 0 to 300 mA, TJ = - 40 to 85 C 300 0.003 OFF mode: VINH = 0.4 V TJ = - 40 to 85 C 1.5 IO = 1 mA 0.4 IO = 1 mA, TJ = -40 to 85 C VDROP Dropout voltage(3) 2 IO = 150 mA 60 mV IO = 150 mA, TJ = - 40 to 85 C 100 IO = 300 mA 150 IO = 300 mA, TJ = - 40 to 85 C ISC SVR IO(PK) 250 Short-circuit current RL = 0 600 55 Supply voltage rejection VI = VO(NOM) + 0.25 V f = 1 kHz VRIPPLE = 0.1 V, IO = 50 mA For VO(NOM) < 2.5 V, f = 10 kHz VI = 2.55 V Peak output current VO VO(NOM) - 5% dB 50 300 550 Inhibit input logic high mA 0.4 Inhibit input logic low VINH mA VI = 2.5 V to 6 V, TJ = - 40 to 85 C V 1.4 IINH Inhibit input current VINH = 0.4 V, VI = 6 V 1 nA eN Output noise voltage BW = 10 Hz to 100 kHz, CO = 2.2 F 30 VRMS CBYP = 33 nF 240 s (5) 160 C tON TSHDN Turn-on time (4) Thermal shutdown Capacitance CO 2.2 22 F 5 5000 m Output capacitor ESR 1. For VO(NOM) < 2 V, VI = 2.5 V. 2. For VO(NOM) = 1.25 V, VI = 2.5 V. 3. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This specification does not apply to input voltages below 2.5 V. 4. Turn-on time is time measured between the enable input just exceeding VINH high value and the output voltage just reaching 95% of its nominal value. 5. Typical thermal protection hysteresis is 20 C. 8/21 DocID11039 Rev 9 LDS3985 5 Typical performance characteristics Typical performance characteristics TJ = 25 C, VI = VO(NOM) + 0.5 V, CI = 1 F, CO = 2.2 F, CBYP = 33 nF, IO = 1 mA, VINH = 1.4 V, unless otherwise specified. Figure 4. Output voltage vs. temperature Figure 3. Output voltage vs. temperature V0 = 2.8 V V0 = 1.35 V Figure 5. Output voltage vs. temperature V0 = 3.3 V Figure 6. Inhibit voltage vs. temperature V0 = 1.35 V */) DocID11039 Rev 9 9/21 Typical performance characteristics LDS3985 Figure 7. Inhibit voltage vs. temperature (VO = 3.3 V) Figure 8. Line regulation vs. temperature (VI = 2.5 V to 6 V) */) Figure 9. Line regulation vs. temperature (VI = 3.2 V to 6 V) Figure 10. Line regulation vs. temperature (VI = 3.8 V to 6 V) Figure 11. Quiescent current vs. temperature (VI = 2.5 V) Figure 12. Quiescent current vs. temperature (VI = 6 V) 10/21 DocID11039 Rev 9 LDS3985 Typical performance characteristics Figure 13. Quiescent current vs. temperature (VI = 3.4 V) Figure 14. Supply voltage rejection vs. frequency Figure 15. Dropout voltage vs. temperature Figure 16. Dropout voltage vs. output current Figure 17. Inhibit transient VI = 5 V, IO = 1 mA, VINH = 0 to 1.2 V, CI = CO = 1 F (cer), CBYP = 10 nF, TR = TF = 1 s DocID11039 Rev 9 11/21 Package mechanical data 6 LDS3985 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. Figure 18. SOT23-5L mechanical drawings BN 12/21 DocID11039 Rev 9 LDS3985 Package mechanical data Table 7. SOT23-5L mechanical data mm Dim. Min. Typ. Max. A 0.90 1.45 A1 0 0.15 A2 0.90 1.30 b 0.30 0.50 c 2.09 0.20 D 2.95 E 1.60 e 0.95 H 2.80 L 0.30 0.60 0 8 Figure 19. SOT23-5L recommended footprint (dimensions in mm). BN DocID11039 Rev 9 13/21 Package mechanical data LDS3985 Figure 20. DFN6 (3 x 3 mm) drawings B& 14/21 DocID11039 Rev 9 LDS3985 Package mechanical data Table 8. DFN6 (3 x 3 mm) mechanical data mm Dim. Min. A 0.80 A1 0 Typ. Max. 1 0.02 A3 0.05 0.20 b 0.23 D 2.90 D2 2.23 E 2.90 E2 1.50 0.45 3 3.10 2.50 3 3.10 1.75 0.95 L 0.30 0.40 DocID11039 Rev 9 0.50 15/21 Package mechanical data LDS3985 Figure 21. DFN6 footprint (dimensions in mm) B& 16/21 DocID11039 Rev 9 LDS3985 7 Packaging mechanical data Packaging mechanical data Figure 22. Tape and reel SOT23-5L mechanical drawings Table 9. Tape and reel SOT23-5L mechanical data mm Dim. Min. Typ. A Max. 180 C 12.8 D 20.2 N 60 13.0 T 13.2 14.4 Ao 3.13 3.23 3.33 Bo 3.07 3.17 3.27 Ko 1.27 1.37 1.47 Po 3.9 4.0 4.1 P 3.9 4.0 4.1 DocID11039 Rev 9 17/21 Packaging mechanical data LDS3985 Figure 23. Tape for DFN6 B1 18/21 DocID11039 Rev 9 LDS3985 Packaging mechanical data Figure 24. Reel for DFN6 B1 Table 10. DFN6 tape and reel mechanical data mm Dim. Min. Typ. Max. A0 3.20 3.30 3.40 B0 3.20 3.30 3.40 K0 1 1.10 1.20 DocID11039 Rev 9 19/21 Revision history 8 LDS3985 Revision history Table 11. Document revision history Date Revision 02-Dec-2004 1 First release. 10-Apr-2007 2 Added: new package TSOT23-5L. 16-May-2007 3 Added: new mechanical data DFN6D and order codes updated. 06-Sep-2007 4 Added: Table 1 in cover page. 11-Jun-2008 5 Modified: Table 10 on page 20. 11-Jul-2009 6 Modified: Table 10 on page 20. 29-Jul-2010 7 Modified: Table 1 on page 1 and Table 10 on page 20. 8 Modified the Title and the Features in cover page. Deleted Table1: Device summary. Updated Table 10: Order codes and Section 6: Package mechanical data. Added Table 6: LDS3985 (automotive grade) electrical characteristics and Section 7: Packaging mechanical data. Minor text changes. 9 Part number LDS3985xx changed to LDS3985. Updated the features, the description and Table 1: Device summary in cover page. Updated Table 5: LDS3985 electrical characteristics, Table 6: LDS3985 (automotive grade) electrical characteristics, Section 5: Typical performance characteristics. 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