LD2985Axx LD2985Bxx Very low drop and low noise voltage regulator low ESR capacitors compatible, with inhibit function Features ■ Very low dropout voltage (280 mV at 150 mA and 7 mV at 1 mA load) ■ Very low quiescent current (2 mA typ. at 150 mA load and 80 µA at no load) ■ Output current up to 150 mA ■ Logic controlled electronic shutdown ■ Output voltage of 1.8, 2.5, 2.7, 2.8, 3, 3.3, 5 V ■ Internal current and thermal limit ■ Available in ± 1.5 % tolerance (at 25 °C, A version) ■ Low output noise voltage 30 mVrms ■ Smallest package SOT23-5L ■ Temperature range: - 40°C to 125 °C SOT23-5L 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. An external capacitor, CBYP = 10 nF, connected between bypass pin and GND reduce the noise to 30 µVrms. Description The LD2985A/Bxx is a 150 mA fixed output voltage regulator. The ultra low drop voltage and the low quiescent current make them particularly suitable for low noise, low power applications, and in battery powered systems. In sleep mode quiescent current is less than 1 µA when INHIBIT pin is pulled low. Shutdown logic control function is available on pin 3 (TTL compatible). This Table 1. Typical application are in cellular phone, palmtop laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera. Device summary Part numbers A version B version Output voltages LD2985AXX18 LD2985BXX18 1.8 V LD2985AXX25 LD2985BXX25 2.5 V LD2985AXX27 LD2985BXX27 2.7 V LD2985AXX28 LD2985BXX28 2.8 V LD2985AXX30 LD2985BXX30 3.0 V LD2985AXX33 LD2985BXX33 3.3 V LD2985AXX50 LD2985BXX50 5.0 V January 2009 Rev 11 1/21 www.st.com 21 Contents LD2985Axx, LD2985Bxx Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.1 External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.2 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.3 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.4 Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.5 Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.6 Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2/21 LD2985Axx, LD2985Bxx 1 Diagram Figure 1. Schematic diagram Diagram 3/21 Pin configuration LD2985Axx, LD2985Bxx 2 Pin configuration Figure 2. Pin connections (top view) Table 2. Pin description Pin n° Symbol 1 IN 2 GND 3 INHIBIT Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be left floating. Disable the device when connected to GND or to a positive voltage less than 0.18V 4 Bypass Bypass pin: capacitor to be connected to GND in order to improve the thermal noise performances 5 OUT Table 3. Symbol 4/21 Name and function Input port Ground pin Output port Thermal data Parameter SOT23-5L Unit RthJC Thermal resistance junction-case 81 °C/W RthJA Thermal resistance junction-ambient 255 °C/W LD2985Axx, LD2985Bxx Maximum ratings 3 Maximum ratings Table 4. Absolute maximum ratings Symbol VI VINH Note: Parameter Value Unit DC input voltage 16 V INHIBIT input voltage 16 V IO Output current Internally limited PD Power dissipation Internally limited TSTG Storage temperature range -65 to 150 °C TOP Operating junction temperature range -40 to 125 °C Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 5/21 Electrical characteristics LD2985Axx, LD2985Bxx 4 Electrical characteristics Table 5. Electrical characteristics for LD2985A (TJ = 25 °C, VI = VO + 1 V, IO = 50 mA, VSHDN = 2 V, CI = CO = 1 µF, unless otherwise specified). Symbol VOP VO VO VO VO VO VO VO VO VO VO VO VO 6/21 Parameter Test conditions Operating input voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Min. Typ. Max. Unit 16 V 1.5 1.522 2.5 VI = 2.5V 1.478 IO = 1 to 150mA 1.462 1.538 IO = 1 to 150mA, TJ= -40 to 125°C 1.447 1.553 VI = 2.8V 1.773 IO = 1 to 150mA 1.755 1.845 IO = 1 to 150mA, TJ= -40 to 125°C 1.737 1.863 VI = 3.5V 1.463 1.8 2.5 1.827 V 2.537 IO = 1 to 50mA 2.4375 2.5625 IO = 1 to 50mA, TJ= -40 to 125°C 2.4125 2.5875 VI = 3.7V 2.660 IO = 1 to 150mA 2.6325 2.7 V V 2.740 2.7675 IO = 1 to 150mA, TJ= -40 to 125°C 2.6055 VI = 3.8V 2.758 IO = 1 to 150mA 2.730 2.870 IO = 1 to 150mA, TJ= -40 to 125°C 2.702 2.898 VI = 3.85V 2.808 IO = 1 to 150mA 2.778 2.921 IO = 1 to 150mA, TJ= -40 to 125°C 2.750 2.950 VI = 4.0V 2.955 V 2.7945 2.8 2.85 3.0 2.842 2.892 V 3.045 IO = 1 to 150mA 2.925 3.075 IO = 1 to 150mA, TJ= -40 to 125°C 2.895 3.105 VI = 4.1V 3.054 IO = 1 to 150mA 3.022 3.1 V V 3.146 3.1775 IO = 1 to 150mA, TJ= -40 to 125°C 2.9915 VI = 4.2V 3.152 IO = 1 to 150mA 3.120 3.280 IO = 1 to 150mA, TJ= -40 to 125°C 3.088 3.312 V 3.2085 3.2 3.248 VI = 4.3V 3.251 IO = 1 to 150mA 3.2175 3.3825 IO = 1 to 150mA, TJ= -40 to 125°C 3.1845 3.4155 VI = 4.5V 3.448 3.3 3.5 3.349 V 3.552 IO = 1 to 150mA 3.412 3.587 IO = 1 to 150mA, TJ= -40 to 125°C 3.377 3.622 VI = 4.6V 3.546 IO = 1 to 150mA 3.510 3.690 IO = 1 to 150mA, TJ= -40 to 125°C 3.474 3.726 3.6 V V 3.654 V LD2985Axx, LD2985Bxx Table 5. Symbol VO VO VO VO ISC Electrical characteristics Electrical characteristics for LD2985A (continued) (TJ = 25 °C, VI = VO + 1 V, IO = 50 mA, VSHDN = 2 V, CI = CO = 1 µF, unless otherwise specified). Parameter Output voltage Output voltage Output voltage Output voltage Short circuit current Test conditions Min. Typ. Max. VI = 4.8V 3.743 3.8 3.857 IO = 1 to 150mA 3.705 IO = 1 to 150mA, TJ= -40 to 125°C 3.667 VI = 5.0V 3.94 IO = 1 to 150mA 3.9 4.1 IO = 1 to 150mA, TJ= -40 to 125°C 3.86 4.14 Line regulation 4.63 4.582 4.817 IO = 1 to 150mA, TJ= -40 to 125°C 4.5355 4.8645 VI = 6.0V 4.925 IO = 1 to 150mA 4.875 5.125 IO = 1 to 150 mA, TJ= -40 to 125°C 4.825 5.175 4.7 5 0.003 IO = 0, TJ= -40 to 125°C IO = 1mA IO = 10mA 7 40 120 280 80 IQ IO = 10mA 100 200 600 SVR VIL VINH<0.18V 2000 Supply voltage rejection CBYP = 0.01µF, CO = 10µF, f = 1kHz TJ= -40 to 125°C 100 150 300 900 µA 3000 4000 0 VINH<0.18V, TJ= -40 to 125°C Control input logic low 350 1200 IO = 150mA, TJ= -40 to 125°C OFF MODE mV 150 400 IO = 50mA, TJ= -40 to 125°C IO = 150mA 60 200 IO = 10mA, TJ= -40 to 125°C IO = 50mA 10 150 IO = 1mA, TJ= -40 to 125°C Quiescent current ON MODE 3 575 IO = 0, TJ= -40 to 125°C IO = 1mA %/VI 225 IO = 150mA, TJ= -40 to 125°C IO = 0 0.014 90 IO = 50mA, TJ= -40 to 125°C IO = 150mA mA 15 IO = 10mA, TJ= -40 to 125°C IO = 50mA V 5 IO = 1mA, TJ= -40 to 125°C Dropout voltage V 5.075 0.032 1 V 4.77 400 VI = VO + 1V to 16V, IO = 1 mA, TJ= -40 to 125°C IO = 0 VDROP 4.06 IO = 1 to 150mA RL = 0 V 3.933 4 VI = 5.7V VI = VO + 1V to 16V, IO = 1 mA ΔVO/ΔVI 3.895 Unit 2 45 dB 0.15 V 7/21 Electrical characteristics Table 5. Symbol Electrical characteristics for LD2985A (continued) (TJ = 25 °C, VI = VO + 1 V, IO = 50 mA, VSHDN = 2 V, CI = CO = 1 µF, unless otherwise specified). Parameter VIH Control input logic high IINH Control input current eN Output noise voltage Table 6. Symbol VOP VO VO VO LD2985Axx, LD2985Bxx Test conditions TJ= -40 to 125°C VO VO VO VO VO 8/21 Max. 2 Unit V 5 15 VINH = 0V, TJ= -40 to 125°C 0 -1 B = 300 Hz to 50 kHz, CBYP = 0.01µF, CO = 10µF 30 µA µV Electrical characteristics for LD2985B (TJ = 25 °C, VI = VO + 1 V, IO = 50 mA, VSHDN = 2 V, CI = CO = 1 µF, unless otherwise specified). Parameter Test conditions Operating input voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Min. Typ. 2.5 VI = 2.5V 1.463 IO = 1 to 150mA 1.455 1.5 Max. Unit 16 V 1.537 1.545 IO = 1 to 150mA, TJ= -40 to 125°C 1.440 VI = 2.8V 1.755 IO = 1 to 150mA 1.746 1.854 IO = 1 to 150mA, TJ= -40 to 125°C 1.728 1.872 VI = 3.5V 2.437 IO = 1 to 150mA 2.425 2.575 2.4 2.6 VI = 3.5V VO Typ. VINH = 5V, TJ= -40 to 125°C IO = 1 to 150mA, TJ= -40 to 125°C VO Min. 2.633 V 1.560 1.8 2.5 2.7 1.845 2.562 V 2.767 IO = 1 to 150mA 2.619 2.781 IO = 1 to 150mA, TJ= -40 to 125°C 2.592 2.808 VI = 3.8V 2.73 IO = 1 to 150mA 2.716 2.8 V V 2.87 2.884 IO = 1 to 150mA, TJ= -40 to 125°C 2.688 VI = 3.85V 2.779 IO = 1 to 150mA 2.764 2.935 IO = 1 to 150mA, TJ= -40 to 125°C 2.736 2.964 VI = 4.0V 2.925 IO = 1 to 150mA 2.91 3.09 IO = 1 to 150mA, TJ= -40 to 125°C 2.88 3.12 VI = 4.1V 3.023 V 2.912 2.85 3.0 3.1 2.921 3.075 V 3.177 IO = 1 to 150mA 3.007 3.193 IO = 1 to 150mA, TJ= -40 to 125°C 2.976 3.224 VI = 4.2V 3.120 IO = 1 to 150mA 3.104 3.2 V V 3.28 3.296 IO = 1 to 150mA, TJ= -40 to 125°C 3.072 VI = 4.3V 3.218 IO = 1 to 150mA 3.201 3.399 IO = 1 to 150mA, TJ= -40 to 125°C 3.168 3.432 V 3.328 3.3 3.382 V LD2985Axx, LD2985Bxx Table 6. Symbol VO VO VO VO VO VO ISC Electrical characteristics Electrical characteristics for LD2985B (continued) (TJ = 25 °C, VI = VO + 1 V, IO = 50 mA, VSHDN = 2 V, CI = CO = 1 µF, unless otherwise specified). Parameter Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Short circuit current Test conditions Min. Typ. Max. VI = 4.5V 3.413 3.5 3.587 IO = 1 to 150mA 3.395 IO = 1 to 150mA, TJ= -40 to 125°C 3.360 VI = 4.6V 3.51 IO = 1 to 150mA 3.492 3.708 IO = 1 to 150mA, TJ= -40 to 125°C 3.456 3.744 VI = 4.8V 3.705 IO = 1 to 150mA 3.686 3.914 IO = 1 to 150mA, TJ= -40 to 125°C 3.648 3.952 VI = 5.0V 3.900 Line regulation 3.8 4 4.12 4.16 VI = 5.7V 4.583 IO = 1 to 150mA 4.559 4.841 IO = 1 to 150mA, TJ= -40 to 125°C 4.512 4.875 IO = 1 to 150mA 4.85 5.15 IO = 1 to 150 mA, TJ= -40 to 125°C 4.8 5.2 1 7 %/VI 3 10 15 40 60 90 120 IO = 50mA, TJ= -40 to 125°C IO = 150mA, TJ= -40 to 125°C mA 5 IO = 10mA, TJ= -40 to 125°C IO = 150mA V 0.014 0.032 IO = 1mA, TJ= -40 to 125°C IO = 50mA 5.125 400 0.003 VI = VO + 1V to 16V, IO = 1 mA, TJ= -40 to 125°C IO = 10mA V 4.888 5 IO = 0, TJ= -40 to 125°C Dropout voltage V 4.817 VI = 6.0V IO = 1mA V 4.100 3.88 4.7 V 3.895 3.84 IO = 0 VDROP 3.69 IO = 1 to 150mA RL = 0 V 3.640 3.6 IO = 1 to 150mA, TJ= -40 to 125°C VI = VO + 1V to 16V, IO = 1 mA ΔVO/ΔVI 3.605 Unit mV 150 225 280 350 575 9/21 Electrical characteristics Table 6. Symbol LD2985Axx, LD2985Bxx Electrical characteristics for LD2985B (continued) (TJ = 25 °C, VI = VO + 1 V, IO = 50 mA, VSHDN = 2 V, CI = CO = 1 µF, unless otherwise specified). Parameter Test conditions Min. IO = 0 Typ. Max. 80 100 IO = 0, TJ= -40 to 125°C 150 IO = 1mA 100 IO = 1mA, TJ= -40 to 125°C Quiescent current ON MODE IQ IO = 10mA 200 IO = 10mA, TJ= -40 to 125°C 600 2000 IO = 150mA, TJ= -40 to 125°C Inhibit input logic low TJ= -40 to 125°C VIH Inhibit input logic high TJ= -40 to 125°C IINH Inhibit input current eN Output noise voltage 10/21 3000 0 VINH<0.18V, TJ= -40 to 125°C VIL µA 4000 VINH<0.18V CBYP = 0.01µF, CO = 10µF, f = 1kHz 900 1200 IO = 150mA Supply voltage rejection 300 400 IO = 50mA, TJ= -40 to 125°C SVR 150 200 IO = 50mA OFF MODE Unit 2 45 dB 0.15 2 V V VINH = 0V, TJ= -40 to 125°C 5 15 VINH = 5V, TJ= -40 to 125°C 0 -1 B = 300 Hz to 50 kHz, CBYP = 0.01µF, CO = 10µF 30 µA µV LD2985Axx, LD2985Bxx Typical characteristics 5 Typical characteristics Figure 3. (TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1 µF(X7R), CO = 2.2 µF(X7R), VINH = 2 V, unless otherwise specified). Output voltage vs temperature Figure 4. Dropout voltage vs temperature Figure 5. Dropout voltage vs output current Figure 6. Quiescent current vs load current Figure 7. Quiescent current vs temperature Figure 8. Supply voltage rejection vs temp. 11/21 Typical characteristics Figure 9. Supply voltage rejection vs output current LD2985Axx, LD2985Bxx Figure 10. Supply voltage rejection vs output current Figure 11. Supply voltage rejection vs frequency Figure 12. Supply voltage rejection vs frequency Figure 13. Line transient Figure 14. Line transient VO = 2.5V, IO = 50mA, no CI, CO = 4.7µF, tr=tf=2ns VO = 2.5V, IO = 50mA, no CI, CO = 4.7µF, tr=tf=1µs 12/21 LD2985Axx, LD2985Bxx Typical characteristics Figure 15. Load transient Figure 16. Load transient VO = 2.5V, IO = 0 to 50mA, no CI, CO = 10µF, tr=tf=2ns VO = 2.5V, IO = 0 to 50mA, no CI, CO = 4.7µF, tr=tf=2ns 13/21 Application notes 6 Application notes 6.1 External capacitors LD2985Axx, LD2985Bxx Like any low-dropout regulator, the LD2985 requires external capacitors for regulator stability. This capacitor must be selected to meet the requirements of minimum capacitance and equivalent series resistance. We suggest to solder input and output capacitors as close as possible to the relative pins. 6.2 Input capacitor An input capacitor whose value is 1 µF is required with the LD2985 (amount of capacitance can be increased without limit). This capacitor must be located a distance of not more than 0.5" from the input pin of the device and returned to a clean analog ground. Any good quality ceramic, tantalum or film capacitors can be used for this capacitor. 6.3 Output capacitor The LD2985 is designed specifically to work with ceramic output capacitors. It may also be possible to use Tantalum capacitors, but these are not as attractive for reasons of size and cost. By the way, the output capacitor must meet both the requirement for minimum amount of capacitance and ESR (equivalent series resistance) value. Due to the different loop gain, the stability improves for higher output versions and so the suggested minimum output capacitor value, if low ESR ceramic type is used, is 1 µF for output voltages equal or major than 3.8 V, 2.2 µF for VO going from 1.8 to 3.3 V, and 3.3 µF for the other versions. However, if an output capacitor lower than the suggested one is used, it's possible to make stable the regulator adding a resistor in series to the capacitor. 6.4 Important The output capacitor must maintain its ESR in the stable region over the full operating temperature to assure stability. Also, capacitor tolerance and variation with temperature must be considered to assure the minimum amount of capacitance is provided at all times. This capacitor should be located not more than 0.5" from the output pin of the device and returned to a clean analog ground. 6.5 Inhibit input operation The inhibit pin can be used to turn OFF the regulator when pulled low, so drastically reducing the current consumption down to less than 1 µA. When the inhibit feature is not used, this pin must be tied to VI to keep the regulator output ON at all times. To assure proper operation, the signal source used to drive the inhibit pin must be able to swing above and below the specified thresholds listed in the electrical characteristics section under VIH VIL. Any slew rate can be used to drive the inhibit. 14/21 LD2985Axx, LD2985Bxx 6.6 Application notes Reverse current The power transistor used in the LD2985 has not an inherent diode connected between the regulator input and output. If the output is forced above the input, no current will flow from the output to the input across the series pass transistor. When a VREV voltage is applied on the output, the reverse current measured flows to the GND across the two feedback resistors. This current typical value is 160 µA. R1 and R2 resistors are implanted type; typical values are, respectively, 42.6 kΩ and 51.150 kΩ. Figure 17. Reverse current test circuit 15/21 Package mechanical data 7 LD2985Axx, LD2985Bxx Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. 16/21 LD2985Axx, LD2985Bxx Package mechanical data 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 17/21 Package mechanical data LD2985Axx, LD2985Bxx 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 18/21 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 LD2985Axx, LD2985Bxx 8 Order codes Table 7. Order codes Order codes A version B version Output voltages LD2985AM18R LD2985BM18R 1.8 V LD2985AM25R LD2985BM25R 2.5 V LD2985BM27R 2.7 V LD2985AM28R LD2985BM28R 2.8 V LD2985AM30R LD2985BM30R 3.0 V LD2985AM33R LD2985BM33R 3.3 V LD2985AM50R LD2985BM50R 5.0 V 19/21 Revision history LD2985Axx, LD2985Bxx 9 Revision history Table 8. Document revision history Date Revision 22-Aug-2005 4 Add new value VO ==> 2.7 V on tables 5 and 6. 02-Sep-2005 5 Mistake VO min. ==> 2.7 V on table 5. 25-Jul-2006 6 Order codes updated. 13-Feb-2008 7 Added: Table 1 on page 1. 04-Mar-2008 8 Modified: Table 5 on page 6 and Table 6 on page 8. 10-Jul-2008 9 Modified: Table 1 on page 1 and Table 7 on page 19. 27-Aug-2008 10 Modified: Features on page 1. 27-Jan-2009 11 Modified: Features on page 1. 20/21 Changes LD2985Axx, LD2985Bxx 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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