LD2981ABxx LD2981Cxx Ultra low drop voltage regulators with inhibit low ESR output capacitors compatible Features Stable with low ESR ceramic capacitors Ultra low dropout voltage (0.17 V typ. at 100 mA load, 7 mV typ. at 1 mA load) Very low quiescent current (80 A typ. at no load in on mode; max 1 A in off mode) Guaranteed output current up to 100mA Logic-controlled electronic shutdown Output voltage of 2.5; 3.0; 3.3; 5.0 V Internal current and thermal limit 0.75 % tolerance output voltage available (A version) Output low noise voltage 160 VRMS Temperature range: -40 to 125 C Smallest package SOT23-5L and SOT-89 Fast dynamic response to line and load changes SOT23-5L SOT-89 logic control function is available on pin n 3 (TTL compatible). This means that when thedevice is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. The LD2981AB/C is designed to work with low ESR ceramic capacitor. Typical applications are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera. Description The LD2981AB/C series are 100 mA fixed-output voltage regulator. The low drop-voltage and the ultra low quiescent current make them suitable for low noise, low power applications and in battery powered systems. The quiescent current in sleep mode is less than 1 A when INHIBIT pin is pulled low. Shutdown Table 1. Device summary Part numbers Output voltage July 2008 AB Version C Version LD2981ABXX25 LD2981CXX25 2.5 V LD2981ABXX30 LD2981CXX30 3.0 V LD2981ABXX33 LD2981CXX33 3.3 V LD2981ABXX50 LD2981CXX50 5.0 V Rev 14 1/23 www.st.com 23 LD2981ABxx - LD2981Cxx Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.1 External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.2 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.3 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.4 Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.5 Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.6 Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2/23 LD2981ABxx - LD2981Cxx 1 Diagram Figure 1. Schematic diagram Diagram 3/23 Pin configuration LD2981ABxx - LD2981Cxx 2 Pin configuration Figure 2. Pin connections (top view) SOT-89 SOT23-5L Table 2. Pin description Pin n SOT23-5L Pin n SOT-89 Symbol 1 3 VIN 2 2 GND 3 INHIBIT 4 NC 5 Table 3. Symbol 1 VOUT Name and function Input port Ground pin 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 0.18 V Not connected Output port Thermal data Parameter SOT23-5L SOT-89 Unit RthJC Thermal resistance junction-case 81 15 C/W RthJA Thermal resistance junction-ambient 255 110 C/W 4/23 LD2981ABxx - LD2981Cxx Maximum ratings 3 Maximum ratings Table 4. Absolute maximum ratings Symbol VI VINH Note: Parameter Value Unit DC input voltage -0.3 to 16 V INHIBIT input voltage -0.3 to 16 V IO Output current Internally limited PD Power dissipation Internally limited TSTG Storage temperature range -55 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. 5/23 Typical application LD2981ABxx - LD2981Cxx 4 Typical application Figure 3. Application circuit Note: Inhibit pin is not internally pulled-up then it must not be left floating. Disable the device when connected to GND or to a positive voltage less than 0.18 V. 6/23 LD2981ABxx - LD2981Cxx Electrical characteristics 5 Electrical characteristics Table 5. Electrical characteristics for LD2981AB (TJ = 25 C, VI = VO(NOM) +1 V, CI = 1 F (X7R), CO = 2.2 F (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified). Symbol VOP VO VO VO VO VO VO VO VO Parameter Test conditions Operating input voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage VO VO VO Output voltage Output voltage Output voltage Line regulation Typ. Max. Unit 16 V 2.5 2.518 2.5 IO = 1 mA 2.481 IO = 1 to 100 mA 2.475 2.525 IO = 1 to 100 mA, TJ= -40 to 125C 2.437 2.562 IO = 1 mA 2.828 IO = 1 to 100 mA 2.822 2.878 IO = 1 to 100 mA, TJ= -40 to 125C 2.779 2.921 IO = 1 mA 2.977 IO = 1 to 100 mA 2.970 3.030 IO = 1 to 100 mA, TJ= -40 to 125C 2.925 3.075 IO = 1 mA 3.176 IO = 1 to 100 mA 3.168 2.85 3 3.2 V 3.224 3.232 3.12 3.275 IO = 1 to 100 mA 3.267 3.333 IO = 1 to 100 mA, TJ= -40 to 125C 3.217 3.383 V 3.28 3.3 3.325 IO = 1 mA 3.573 IO = 1 to 100 mA 3.564 3.636 IO = 1 to 100 mA, TJ= -40 to 125C 3.510 3.690 IO = 1 mA 3.771 IO = 1 to 100 mA 3.762 3.838 IO = 1 to 100 mA, TJ= -40 to 125C 3.705 3.895 IO = 1 mA 3.97 IO = 1 to 100 mA 3.96 3.6 3.8 4 V 3.829 V 4.03 4.04 3.9 V 3.627 V 4.1 IO = 1 mA 4.664 IO = 1 to 100 mA 4.653 4.747 IO = 1 to 100 mA, TJ= -40 to 125C 4.582 4.817 4.7 4.735 IO = 1 mA 4.813 IO = 1 to 100 mA 4.801 4.899 IO = 1 to 100 mA, TJ= -40 to 125C 4.729 4.971 IO = 1 mA 4.962 IO = 1 to 100 mA 4.950 5.050 IO = 1 to 100 mA, TJ= -40 to 125C 4.875 5.125 TJ= -40 to 125C V 3.023 IO = 1 mA VO(NOM) + 1 < VIN < 16 V, IO = 1 mA V 2.872 IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 to 100 mA, TJ= -40 to 125C VO Min. 4.85 5 0.003 V 4.887 V 5.038 0.014 0.032 V %/V 7/23 Electrical characteristics Table 5. Symbol LD2981ABxx - LD2981Cxx Electrical characteristics for LD2981AB (continued) (TJ = 25 C, VI = VO(NOM) +1 V, CI = 1 F (X7R), CO = 2.2 F (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified). Parameter Test conditions Min. IO = 0 Typ. Max. 80 100 IO = 0, TJ= -40 to 125C 150 IO = 1 mA Quiescent current ON MODE IQ 100 IO = 1 mA, TJ= -40 to 125C IO = 25 mA 250 1000 IO = 100 mA, TJ= -40 to 125C A 1300 2600 VINH < 0.3 V 0.8 VINH < 0.15 V, TJ= -40 to 125C 2 IO = 0 1 IO = 0, TJ= -40 to 125C 3 5 IO = 1mA Dropout voltage (1) 400 800 IO = 100 mA VDROP 150 200 IO = 25 mA, TJ= -40 to 125C OFF MODE Unit 7 IO = 1mA, TJ= -40 to 125C 10 15 IO = 25mA 70 IO = 25mA, TJ= -40 to 125C 100 mV 150 IO = 100mA 180 IO = 100mA, TJ= -40 to 125C 250 375 Short circuit current RL = 0 150 mA SVR Supply voltage rejection CO = 10F, f = 1KHz 63 dB VINH Inhibit input logic low LOW = Output OFF, TJ= -40 to 125C VINL Inhibit input logic high HIGH = Output ON, TJ= -40 to 125C IINH Inhibit input current eN Output noise voltage ISC TSHDN Thermal shutdown 0.18 1.6 V VINH = 0V, TJ= -40 to 125C 0 -1 VINH = 5V, TJ= -40 to 125C 5 15 BW = 300 Hz to 50 KHz, CO = 10F A 160 VRMS 170 C 1. For VO < 2.5 V dropout voltage can be calculated according to the minimum input voltage in full temperature range. 8/23 V LD2981ABxx - LD2981Cxx Table 6. Symbol VOP VO VO VO VO VO VO VO VO VO VO VO VO Electrical characteristics Electrical characteristics for LD2981C (TJ = 25 C, VI = VO(NOM) +1 V, CI = 1 F (X7R), CO = 2.2 F (X7R), IO = 1 mA, VINH = 2 V, 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 Output voltage Output voltage Min. Typ. 2.5 Max. Unit 16 V IO = 1 mA 1.478 IO = 1 to 100 mA 1.470 1.530 IO = 1 to 100 mA, TJ= -40 to 125C 1.445 1.555 IO = 1 mA 1.777 IO = 1 to 100 mA 1.764 1.5 1.8 1.522 V 1.822 1.836 IO = 1 to 100 mA, TJ= -40 to 125C 1.737 IO = 1 mA 2.468 IO = 1 to 100 mA 2.45 2.55 IO = 1 to 100 mA, TJ= -40 to 125C 2.412 2.587 V 1.863 2.5 2.531 IO = 1 mA 2.814 IO = 1 to 100 mA 2.793 2.907 IO = 1 to 100 mA, TJ= -40 to 125C 2.75 2.949 IO = 1 mA 2.962 2.85 3 2.885 V 3.037 IO = 1 to 100 mA 2.94 3.06 IO = 1 to 100 mA, TJ= -40 to 125C 2.895 3.105 IO = 1 mA 3.16 IO = 1 to 100 mA 3.136 3.2 V V 3.24 3.264 IO = 1 to 100 mA, TJ= -40 to 125C 3.088 IO = 1 mA 3.258 IO = 1 to 100 mA 3.234 3.366 IO = 1 to 100 mA, TJ= -40 to 125C 3.184 3.415 V 3.312 3.3 3.341 IO = 1 mA 3.555 IO = 1 to 100 mA 3.528 3.672 IO = 1 to 100 mA, TJ= -40 to 125C 3.474 3.726 IO = 1 mA 3.752 IO = 1 to 100 mA 3.724 3.876 IO = 1 to 100 mA, TJ= -40 to 125C 3.667 3.933 IO = 1 mA 3.95 IO = 1 to 100 mA 3.92 3.6 3.8 4 V 3.645 V 3.847 V 4.05 4.08 IO = 1 to 100 mA, TJ= -40 to 125C 3.86 IO = 1 mA 4.641 IO = 1 to 100 mA 4.606 4.794 IO = 1 to 100 mA, TJ= -40 to 125C 4.535 4.864 V 4.14 4.7 4.758 IO = 1 mA 4.789 IO = 1 to 100 mA 4.753 4.947 IO = 1 to 100 mA, TJ= -40 to 125C 4.68 5.019 4.85 V 4.91 V 9/23 Electrical characteristics Table 6. Symbol LD2981ABxx - LD2981Cxx Electrical characteristics for LD2981C (continued) (TJ = 25 C, VI = VO(NOM) +1 V, CI = 1 F (X7R), CO = 2.2 F (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified) Parameter Test conditions IO = 1 mA VO Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C VO Line regulation Min. Typ. Max. 4.937 5 5.062 4.9 5.1 4.825 VO(NOM) + 1 < VIN < 16 V, IO = 1 mA TJ= -40 to 125C 80 100 IO = 1 mA, TJ= -40 to 125C IO = 25 mA 250 1000 IO = 100 mA, TJ= -40 to 125C 400 A 1300 2600 VINH < 0.3 V 0.8 VINH < 0.15 V, TJ= -40 to 125C 2 IO = 0 1 IO = 0, TJ= -40 to 125C 3 5 IO = 1 mA Dropout voltage (1) 150 800 IO = 100 mA VDROP 100 200 IO = 25 mA, TJ= -40 to 125C OFF MODE %/V 150 IO = 1 mA IQ 0.014 0.032 IO = 0, TJ= -40 to 125C Quiescent current ON MODE V 5.175 0.003 IO = 0 Unit 7 10 70 100 IO = 1 mA, TJ= -40 to 125C 15 IO = 25 mA IO = 25 mA, TJ= -40 to 125C mV 150 IO = 100 mA 180 IO = 100 mA, TJ= -40 to 125C 250 375 Short circuit current RL = 0 150 mA SVR Supply voltage rejection CO = 10F, f = 1KHz 63 dB VINH Inhibit input logic low LOW = Output OFF, TJ= -40 to 125C VINL Inhibit input logic high HIGH = Output ON, TJ= -40 to 125C ISC IINH Inhibit input current eN Output noise voltage TSHDN Thermal shutdown 0.18 1.6 V VINH = 0V, TJ= -40 to 125C 0 -1 VINH = 5V, TJ= -40 to 125C 5 15 BW = 300 Hz to 50 KHz, CO = 10F F 160 VRMS 170 C 1. For VO < 2.5 V dropout voltage can be calculated according to the minimum input voltage in full temperature range. 10/23 V LD2981ABxx - LD2981Cxx Typical performance characteristics 6 Typical performance characteristics Figure 4. (TJ = 25 C, VI = VO(NOM) +1 V, CI = 1 F (X7R), CO = 2.2 F (X7R), VINH = 2 V, unless otherwise specified). Output voltage vs temperature Figure 5. Dropout voltage vs temperature Figure 6. Line regulation vs temperature Figure 7. Load regulation vs temperature Figure 8. Dropout voltage vs temperature Figure 9. Quiescent current vs temperature 11/23 Typical performance characteristics Figure 10. Quiescent current vs output current LD2981ABxx - LD2981Cxx Figure 11. Off mode quiescent current vs temperature Figure 12. Quiescent current vs input voltage Figure 13. Dropout voltage vs output current Figure 14. Inhibit input current vs temperature Figure 15. Inhibit voltage vs temperature 12/23 LD2981ABxx - LD2981Cxx Typical performance characteristics Figure 16. Supply voltage rejection vs frequency Figure 17. Noise voltage vs frequency Figure 18. Best case: highest output version Figure 19. Worst case: lowest output version Figure 20. Load transient response Figure 21. Line transient response VO = 4.7V, IO = 1 to 100mA, CO = 4.7F (X7R) VI = [VO(NOM) +1V], VO = 4.7V, IO = 100mA, CO = 4.7F (X7R) 13/23 Application notes 7 Application notes 7.1 External capacitors LD2981ABxx - LD2981Cxx Like any low-dropout regulator, the LD2981 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. 7.2 Input capacitor An input capacitor whose value is 1 F is required with the LD2981 (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. 7.3 Output capacitor The LD2981 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. The Figure 3 and Figure 4 show the allowable ESR range as a function of the output capacitance. These curves represent the stability region over the full temperature and IO range. 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 F for output voltages equal or major than 3.8 V, 2.2 F for output voltages from 2.85 to 3.3 V, and 3.3 F 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 (see Figure 1 and Figure 2 to choose the right value according to the used version and keeping in account that the ESR of ceramic capacitors has been measured @ 100 kHz). 7.4 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. 7.5 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 A. 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. 14/23 LD2981ABxx - LD2981Cxx 7.6 Application notes Reverse current The power transistor used in the LD2981 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, according to the test circuit in Figure 22, flows to the GND across the two feedback resistors. This current typical value is 160 A. R1 and R2 resistors are implanted type; typical values are, respectively, 42.6 k and 51.150 k. Figure 22. Reverse current test circuit 15/23 Package mechanical data 8 LD2981ABxx - LD2981Cxx 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. 16/23 LD2981ABxx - LD2981Cxx Package mechanical data SOT-89 mechanical data mm. mils. Dim. Min. Typ. Max. Min. Typ. Max. A 1.4 1.6 55.1 63.0 B 0.44 0.56 17.3 22.0 B1 0.36 0.48 14.2 18.9 C 0.35 0.44 13.8 17.3 C1 0.35 0.44 13.8 17.3 D 4.4 4.6 173.2 181.1 D1 1.62 1.83 63.8 72.0 E 2.29 2.6 90.2 102.4 e 1.42 1.57 55.9 61.8 e1 2.92 3.07 115.0 120.9 H 3.94 4.25 155.1 167.3 L 0.89 1.2 35.0 47.2 P025H 17/23 Package mechanical data LD2981ABxx - LD2981Cxx 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 18/23 LD2981ABxx - LD2981Cxx Package mechanical data Tape & reel SOT23-xL mechanical data mm. inch. Dim. Min. Typ. A Max. Min. Typ. 180 13.0 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 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 19/23 Package mechanical data LD2981ABxx - LD2981Cxx Tape & reel SOT-89 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 4.70 4.80 4.90 0.185 0.189 0.193 Bo 4.30 4.40 4.50 0.169 0.173 0.177 Ko 1.70 1.80 1.90 0.067 0.071 0.075 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 7.9 8.0 8.1 0.311 0.315 0.319 LD2981ABxx - LD2981Cxx 9 Order codes Table 7. Order codes Order codes AB Version C Version Output voltage SOT23-5L SOT-89 LD2981ABM25TR LD2981ABU25TR (1) LD2981ABM30TR LD2981ABU30TR (1) LD2981ABM33TR LD2981ABM50TR SOT23-5L SOT-89 LD2981CU25TR (1) 2.5 V LD2981CM30TR LD2981CU30TR (1) 3.0 V LD2981ABU33TR LD2981CM33TR LD2981CU33TR 3.3 V LD2981ABU50TR LD2981CM50TR LD2981CU50TR 5.0 V 1. Available on request. 21/23 Revision history LD2981ABxx - LD2981Cxx 10 Revision history Table 8. Document revision history Date Revision 25-Jul-2006 12 Order codes updated. 14-Feb-2008 13 Added: Table 1 on page 1. 14-Jul-2008 14 Modified: Table 1 on page 1 and Table 7 on page 21. 22/23 Changes LD2981ABxx - LD2981Cxx 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. 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