LD3985xx Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible Features Input voltage from 2.5 V to 6 V Stable with low ESR ceramic capacitors Ultra low dropout voltage (60 mV typ. at 150 mA load, 0.4 mV typ. at 1 mA load) Very low quiescent current (85 A typ. at no load, 170 A typ. at 150 mA load; max 1.5 A in OFF mode) Guaranteed output current up to 150 mA Wide range of output voltage: 1.22 V; 1.8 V; 2.5 V; 2.6 V; 2.7 V; 2.8 V; 2.9 V; 3 V; 3.3 V; 4.7 V Fast turn-on time: typ. 200 s [CO = 1 F, CBYP = 10 nF and IO = 1 mA] Logic-controlled electronic shutdown Internal current and thermal limit Output low noise voltage 30 VRMS over 10 Hz to 100 kHz SVR of 60 dB at 1 kHz, 50 dB at 10 kHz Temperature range: - 40 C to 125 C Flip-chip (1.57 x 1.22) SOT23-5L TSOT23-5L to roll off at 10 kHz. High power supply rejection is maintained down to low input voltage levels common to battery operated circuits. 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. The LD3985xx is designed to work with low ESR ceramic capacitors. Typical applications are in mobile phone and similar battery powered wireless systems. Description The LD3985xx provides up to 150 mA, from 2.5 V to 6 V input voltage. The ultra low drop-voltage, low quiescent current and low noise make it suitable for low power applications and in battery powered systems. Regulator ground current increases only slightly in dropout, further prolonging the battery life. Power supply rejection is better than 60 dB at low frequencies and starts Table 1. Device summary Part numbers January 2011 LD3985XX122 LD3985XX28 LD3985XX18 LD3985XX29 LD3985XX25 LD3985XX30 LD3985XX26 LD3985XX33 LD3985XX27 LD3985XX47 Doc ID 9587 Rev 14 1/23 www.st.com 23 Contents LD3985xx Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2/23 Doc ID 9587 Rev 14 LD3985xx Diagram 1 Diagram Figure 1. Schematic diagram Doc ID 9587 Rev 14 3/23 Pin configuration LD3985xx 2 Pin configuration Figure 2. Pin connections (top view for SOT and TSOT, top through view for Flip-chip) SOT23-5L/TSOT23-5L Table 2. Flip-chip Pin description Pin n for SOT23-5L/ TSOT23-5L Pin n for Flip-chip Symbol 1 4 VI 2 2 GND Common ground 3 1 VINH Inhibit input voltage: ON MODE when VINH 1.2 V, OFF MODE when VINH 0.4 V (Do not leave floating, not internally pulled down/up) 4 5 BYPASS 5 3 VO 4/23 Name and function Input voltage of the LDO Bypass pin: connect an external capacitor (usually 10 nF) to minimize noise voltage Output voltage of the LDO Doc ID 9587 Rev 14 LD3985xx Typical application 3 Typical application Figure 3. Typical application circuit Doc ID 9587 Rev 14 5/23 Maximum ratings LD3985xx 4 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 V TSTG Storage temperature range -65 to 150 C TOP Operating junction temperature range -40 to 125 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 SOT23-5L/ TSOT23 Parameter RthJC Thermal resistance junction-case 81 RthJA Thermal resistance junction-ambient 255 6/23 Doc ID 9587 Rev 14 Flip-chip Unit C/W 170 C/W LD3985xx 5 Electrical characteristics Electrical characteristics TJ = 25 C, VI = VO(NOM) +0.5 V, CI = 1 F, CBYP = 10 nF, IO = 1 mA, VINH = 1.4 V, unless otherwise specified. Table 5. Symbol Electrical characteristics for LD3985 Parameter VI Operating input voltage VO Output voltage < 2.5 V VO Output voltage 2.5 V VO Line regulation (1) VO VO VO Load regulation Load regulation Test conditions Min. Typ. Max. Unit 2.5 6 V IO = 1 mA -50 50 TJ= -40 to 125C -75 75 IO = 1 mA -2 2 TJ= -40 to 125C -3 3 VI = VO(NOM) + 0.5 to 6 V TJ= -40 to 125C -0.1 0.1 VO = 4.7 to 5V -0.19 mV %/V 0.19 IO = 1 mA to 150mA, VO < 2.5V TJ= -40 to 125C 0.002 0.008 IO = 1 mA to 150mA, VO 2.5V TJ= -40 to 125C (for flip-chip) 0.0004 0.002 IO = 1 mA to 150mA, TJ= -40 to 125C (for SOT23-5L/TSOT23-5L), VO 2.5V 0.0025 0.005 1.5 IO = 0 85 IQ IO = 0, TJ= -40 to 125C IO = 0 to 150mA %/mA %/mA Output AC Line regulation VI = VO(NOM) + 1 V, IO = 150mA, (2) tR= tF = 30s Quiescent current ON MODE: VINH = 1.2 V % of VO(NOM) mVPP 150 170 A IO = 0 to 150mA, TJ= -40 to 125C 250 0.003 OFF MODE: VINH = 0.4 V TJ= -40 to 125C IO = 1mA 1.5 0.4 IO = 1mA, TJ= -40 to 125C IO = 50mA VDROP Dropout voltage (3) 2 20 IO = 50mA, TJ= -40 to 125C IO = 100mA 35 mV 45 IO = 100mA, TJ= -40 to 125C IO = 150mA 70 60 IO = 150mA, TJ= -40 to 125C ISC Short circuit current RL = 0 100 600 Doc ID 9587 Rev 14 mA 7/23 Electrical characteristics Table 5. Symbol SVR IO(PK) LD3985xx Electrical characteristics for LD3985 (continued) Parameter Supply voltage rejection Peak output current Test conditions VI = VO(NOM)+0.25V VRIPPLE = 0.1V, IO= 50mA VO(NOM) < 2.5V, VI = 2.55V Min. Typ. f = 1kHz 60 f = 10kHz 50 Inhibit input logic high Unit dB VO VO(NOM) - 5% 300 550 mA 0.4 Inhibit input logic low VINH Max. VI = 2.5V to 6V, TJ= -40 to 125C V 1.2 IINH Inhibit input current VINH = 0.4V, VI = 6V 1 nA eN Output noise voltage BW = 10 Hz to 100 kHz, CO = 1F 30 VRMS CBYP = 10 nF 100 (5) 160 tON TSHDN Turn On time (4) Thermal shutdown Capacitance CO (6) 250 s C 1 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 for 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 6. The minimum capacitor value is 1 F, anyway the LD3985 is still stable if the compensation capacitor has a 30 % tolerance in all temperature range 8/23 Doc ID 9587 Rev 14 LD3985xx Typical performance characteristics 6 Typical performance characteristics Figure 4. TJ = 25 C, VI = VO(NOM) +0.5 V, CI = CO = 1 F, CBYP = 10 nF, IO = 1 mA, VINH = 1.4 V, unless otherwise specified. Output voltage vs. temperature Figure 5. Output voltage vs. temperature Figure 6. Output voltage vs. temperature Figure 7. Shutdown voltage vs. temperature Figure 8. Shutdown voltage vs. temperature Figure 9. Line regulation vs. temperature Doc ID 9587 Rev 14 9/23 Typical performance characteristics LD3985xx Figure 10. Line regulation vs. temperature Figure 11. Line regulation vs. temperature Figure 12. Load regulation vs. temperature Figure 13. Load regulation vs. temperature Figure 14. Load regulation vs. temperature Figure 15. Quiescent current vs. temperature 10/23 Doc ID 9587 Rev 14 LD3985xx Typical performance characteristics Figure 16. Quiescent current vs. temperature Figure 17. Quiescent current vs. temperature Figure 18. Supply voltage rejection vs. frequency Figure 19. Load transient response VI = 3.2V, IO = 1 to 150mA, Rise-Fall time = 1sec Figure 20. Line transient response Figure 21. Start-Up VI = 3.8V to 4.4V, TJ = 25C, IO = 150mA, CI = CO = 1F (X7R), CBYP = 10nF, Rise-Fall time = 1sec, VO = 2.7V VI = 3.3V, IO = 1mA, CI = CO = 1F (cer), CBYP = 10nF, Tr = 20ns, VO = 2.8V Doc ID 9587 Rev 14 11/23 Typical performance characteristics LD3985xx Figure 22. Turn-Off VI = 3.3V, IO = 1mA, CI = CO = 1mF (cer), CBYP = 10nF, Tf = 20ns, VO = 2.8V 12/23 Doc ID 9587 Rev 14 LD3985xx 7 Package mechanical data 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. Doc ID 9587 Rev 14 13/23 Package mechanical data LD3985xx SOT23-5L mechanical data mm. mils. Dim. Min. Typ. Max. Min. Typ. Max. A 0.90 1.45 35.4 57.1 A1 0.00 0.10 0.0 3.9 A2 0.90 1.30 35.4 51.2 b 0.35 0.50 13.7 19.7 C 0.09 0.20 3.5 7.8 D 2.80 3.00 110.2 118.1 E 1.50 1.75 59.0 68.8 e 0.95 37.4 H 2.60 3.00 102.3 118.1 L 0.10 0.60 3.9 23.6 7049676D 14/23 Doc ID 9587 Rev 14 LD3985xx Package mechanical data TSOT23-5L mechanical data mm. mils. Dim. Min. Typ. A Max. Min. Typ. Max. 1.1 43.3 3.9 A1 0 0.1 A2 0.7 1.0 27.6 39.4 b 0.3 0.5 11.8 19.7 C 0.08 0.2 3.1 7.9 D 2.9 114.2 E 2.8 110.2 E1 1.6 63.0 e 0.95 37.4 e1 1.9 74.8 L 0.3 0.6 11.8 23.6 7282780B Doc ID 9587 Rev 14 15/23 Package mechanical data Table 6. LD3985xx Flip-chip 5 mechanical data mm. 16/23 Dim. Min. Typ. Max. A 0.54 0.65 0.66 A1 0.21 0.25 0.29 A2 0.33 0.35 0.37 b 0.265 0.315 0.365 D 1.54 1.59 1.64 D1 0.83 0.87 0.91 E 1.19 1.24 1.29 E1 0.46 0.5 0.54 eD 0.395 0.435 0.475 eE 0.21 0.25 0.29 fD 0.360 fE 0.370 ccc 0.080 $ 0.05 Doc ID 9587 Rev 14 LD3985xx Package mechanical data Figure 23. Drawing dimension Flip-chip 5 7224716/N Doc ID 9587 Rev 14 17/23 Package mechanical data LD3985xx Tape & reel SOT23-xL mechanical data mm. inch. Dim. Min. Typ. A Min. Typ. 180 13.0 13.2 Max. 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 18/23 Max. 0.504 0.512 14.4 0.519 0.567 Ao 3.13 3.23 3.33 0.123 0.127 0.131 Bo 3.07 3.17 3.27 0.120 0.124 0.128 Ko 1.27 1.37 1.47 0.050 0.054 0.0.58 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 3.9 4.0 4.1 0.153 0.157 0.161 Doc ID 9587 Rev 14 LD3985xx Package mechanical data Tape & reel Flip-chip 5 mechanical data mm. inch. Dim. Min. Typ. A Max. Min. Typ. 178 C 12.8 D 20.2 N 49 13.2 Max. 6.926 0.504 0.519 0.795 50 T 51 1.929 1.969 12.4 2.008 0.488 Ao 1.60 1.65 1.70 0.063 0.065 0.067 Bo 1.27 1.32 1.37 0.050 0.052 0.054 Ko 0.76 0.81 0.86 0.030 0.032 0.034 Po 3.9 4 4.1 0.153 0.157 0.161 P 3.9 4 4.1 0.153 0.157 0.161 Doc ID 9587 Rev 14 19/23 Package mechanical data LD3985xx Tape & reel TSOT23-5L mechanical data mm. inch. Dim. Min. Typ. A Min. Typ. 180 13.0 13.2 Max. 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 20/23 Max. 0.504 0.512 14.4 0.519 0.567 Ao 3.13 3.23 3.33 0.123 0.127 0.131 Bo 3.07 3.17 3.27 0.120 0.124 0.128 Ko 1.27 1.37 1.47 0.050 0.054 0.0.58 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 3.9 4.0 4.1 0.153 0.157 0.161 Doc ID 9587 Rev 14 LD3985xx Order codes 8 Order codes Table 7. Order codes Packages SOT23-5L TSOT23-5L LD3985M122R LD3985G122R (1) LD3985M18R LD3985G18R LD3985J18R 1.8 V LD3985M25R LD3985G25R LD3985J25R 2.5 V LD3985J26R 2.6 V LD3985M26R (1) LD3985G26R Flip-chip (1) LD3985M27R LD3985G27R LD3985M28R LD3985G28R LD3985M29R Output voltage 1.22 V 2.7 V LD3985J28R 2.8 V LD3985J29R 2.9 V LD3985M30R LD3985G30R LD3985J30R 3.0 V LD3985M33R LD3985G33R LD3985J33R 3.3 V LD3985M47R LD3985G47R 4.7 V 1. Available on request. Doc ID 9587 Rev 14 21/23 Revision history LD3985xx 9 Revision history Table 8. Document revision history Date Revision 07-May-2004 6 Part number status changed on table 3. 05-Oct-2004 7 tON values are changed on table 5. 27-Oct-2004 8 Order codes changed - table 3. 17-Mar-2005 9 Improved drawing quality for figures 19 - 20 - 21 - 22. 10-Apr-2007 10 Order codes updated. 08-Jun-2007 11 Order code change. 20-Dec-2007 12 Modified: Table 1, Table 7, mechanical data for Flip-chip. 02-Dec-2008 13 Modified: Table 6 on page 16 and Figure 23 on page 17. 03-Jan-2011 14 Modified: Features on page 1 and Table 7 on page 21. 22/23 Changes Doc ID 9587 Rev 14 LD3985xx 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. 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