LD2980ABxx LD2980Cxx Ultra low drop voltage regulators compatible with low ESR inhibit output capacitors Features ■ Stable with low ESR ceramic capacitors ■ Ultra low dropout voltage (0.12 V typ. at 50 mA load, 7 mV typ. at 1 mA load) ■ Very low quiescent current (80 µA typ. at no load in on mode; max 1 µA in off mode) ■ Guaranteed output current up to 50 mA ■ Logic-controlled electronic shutdown ■ Output voltage of 1.8; 3.0; 3.3; 3.6; 5.0 V ■ Internal current and thermal limit ■ ± 0.5% Tolerance output voltage available (A version) ■ Output low noise voltage 160 µVRMS ■ 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 available on pin n° 3 (TTL compatible). 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 LD2980 is designed to work with low ESR ceramic capacitors. Typical applications are cellular phone, laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera. Description The low drop-voltage and the ultra low quiescent current make them suitable for low noise, low power applications and in battery poweredsystems. The quiescent current in sleep mode is less than 1 µA when the INHIBIT pin is pulled low. A shutdown logic control function is Table 1. Device summary Part numbers AB Version C Version Output voltage LD2980CXX18 1.8 V LD2980ABXX30 July 2008 3.0 V LD2980ABXX33 LD2980CXX33 3.3 V LD2980ABXX36 LD2980CXX36 3.6 V LD2980ABXX50 LD2980CXX50 5.0 V Rev 17 1/23 www.st.com 23 LD2980ABxx - LD2980Cxx 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 LD2980ABxx - LD2980Cxx 1 Diagram Figure 1. Schematic diagram Diagram 3/23 Pin configuration LD2980ABxx - LD2980Cxx 2 Pin configuration Figure 2. Pin connections (top view) TO-92 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 LD2980ABxx - LD2980Cxx 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 LD2980ABxx - LD2980Cxx 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 LD2980ABxx - LD2980Cxx Electrical characteristics 5 Electrical characteristics Table 5. Electrical characteristics for LD2980AB (TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1 µF(X7R), CO = 2.2 µF (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 ΔVO Output voltage Output voltage Output voltage Line regulation Typ. Max. Unit 16 V 2.5 2.513 2.5 IO = 1 mA 2.487 IO = 1 to 50 mA 2.481 2.519 IO = 1 to 50 mA, TJ= -40 to 125°C 2.437 2.562 IO = 1 mA 2.835 IO = 1 to 50 mA 2.828 2.871 IO = 1 to 50 mA, TJ= -40 to 125°C 2.779 2.921 IO = 1 mA 2.985 2.85 3 2.978 3.023 2.925 3.075 IO = 1 mA 3.184 IO = 1 to 50 mA 3.176 3.224 3.12 IO = 1 mA 3.284 IO = 1 to 50 mA 3.275 3.325 IO = 1 to 50 mA, TJ= -40 to 125°C 3.217 3.383 V 3.28 3.3 3.317 IO = 1 mA 3.582 IO = 1 to 50 mA 3.573 3.627 IO = 1 to 50 mA, TJ= -40 to 125°C 3.51 3.690 IO = 1 mA 3.781 3.6 3.8 3.772 3.829 3.705 3.895 IO = 1 mA 3.98 IO = 1 to 50 mA 3.97 V 4.02 4.03 3.9 V 3.819 IO = 1 to 50 mA, TJ= -40 to 125°C 4 V 3.618 IO = 1 to 50 mA V 4.1 IO = 1 mA 4.677 IO = 1 to 50 mA 4.665 4.735 IO = 1 to 50 mA, TJ= -40 to 125°C 4.582 4.818 4.7 4.724 IO = 1 mA 4.826 IO = 1 to 50 mA 4.814 4.886 IO = 1 to 50 mA, TJ= -40 to 125°C 4.729 4.971 IO = 1 mA 4.975 4.85 5 V 5.025 4.963 5.038 IO = 1 to 50 mA, TJ= -40 to 125°C 4.875 5.125 0.003 V 4.874 IO = 1 to 50 mA TJ= -40 to 125°C V 3.216 IO = 1 to 50 mA, TJ= -40 to 125°C VO(NOM) + 1 < VIN < 16 V, IO = 1 mA V 3.015 IO = 1 to 50 mA, TJ= -40 to 125°C 3.2 V 2.864 IO = 1 to 50 mA IO = 1 to 50 mA, TJ= -40 to 125°C VO Min. 0.014 0.032 V %/V 7/23 Electrical characteristics Table 5. Symbol LD2980ABxx - LD2980Cxx Electrical characteristics for LD2980AB (continued) (TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1 µF(X7R), CO = 2.2 µF (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 125°C 150 IO = 1 mA Quiescent current ON MODE IQ 100 IO = 1 mA, TJ= -40 to 125°C IO = 10 mA 175 500 IO = 50 mA, TJ= -40 to 125°C µA 700 1200 VINH < 0.18 V 0 VINH < 0.18 V, TJ= -40 to 125°C 1 IO = 0 1 IO = 0, TJ= -40 to 125°C 3 5 IO = 1mA Dropout voltage(1) 250 450 IO = 50 mA VDROP 150 200 IO = 10 mA, TJ= -40 to 125°C OFF MODE Unit 7 IO = 1mA, TJ= -40 to 125°C 10 15 IO = 10mA 40 IO = 10mA, TJ= -40 to 125°C 60 mV 90 IO = 50mA 120 IO = 50mA, TJ= -40 to 125°C 150 225 Short circuit current RL = 0 150 mA SVR Supply voltage rejection CO = 10µF, f = 1kHz 63 dB VINH Inhibit input logic low LOW = Output OFF, TJ= -40 to 125°C 0.8 VINL Inhibit input logic high HIGH = Output ON, TJ= -40 to 125°C IINH Inhibit input current eN Output noise voltage ISC TSHDN Thermal shutdown 1.6 0.18 1.3 V VINH = 0V, TJ= -40 to 125°C 0 -1 VINH = 5V, TJ= -40 to 125°C 5 15 BW = 300 Hz to 50 kHz, CO = 10µF µA 160 µVRMS 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 LD2980ABxx - LD2980Cxx Table 6. Symbol VOP Electrical characteristics Electrical characteristics for LD2980C (TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1 µF (X7R), CO = 2.2 µF (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified) Parameter Test conditions Operating input voltage VO VO VO VO VO VO VO VO VO VO VO Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Output voltage Typ. 2.5 IO = 1 mA VO Min. 1.478 1.5 Max. Unit 16 V 1.522 IO = 1 to 50 mA 1.470 1.530 IO = 1 to 50 mA, TJ= -40 to 125°C 1.445 1.555 IO = 1 mA 1.782 IO = 1 to 50 mA 1.773 IO = 1 to 50 mA, TJ= -40 to 125°C 1.737 IO = 1 mA 2.475 IO = 1 to 50 mA 2.463 2.538 IO = 1 to 50 mA, TJ= -40 to 125°C 2.412 2.587 1.8 V 1.818 1.827 V 1.863 2.5 2.525 IO = 1 mA 2.822 IO = 1 to 50 mA 2.807 2.893 IO = 1 to 50 mA, TJ= -40 to 125°C 2.75 2.949 IO = 1 mA 2.97 2.85 3 2.879 V 3.03 IO = 1 to 50 mA 2.955 3.045 IO = 1 to 50 mA, TJ= -40 to 125°C 2.895 3.105 IO = 1 mA 3.168 IO = 1 to 50 mA 3.152 IO = 1 to 50 mA, TJ= -40 to 125°C 3.088 IO = 1 mA 3.267 IO = 1 to 50 mA 3.251 3.35 IO = 1 to 50 mA, TJ= -40 to 125°C 3.184 3.415 3.2 V V 3.232 3.248 V 3.312 3.3 3.333 IO = 1 mA 3.564 IO = 1 to 50 mA 3.546 3.654 IO = 1 to 50 mA, TJ= -40 to 125°C 3.474 3.726 IO = 1 mA 3.76 3.6 3.8 3.636 V 3.838 IO = 1 to 50 mA 3.743 3.857 IO = 1 to 50 mA, TJ= -40 to 125°C 3.667 3.933 IO = 1 mA 3.96 IO = 1 to 50 mA 3.94 4 V V 4.04 4.06 IO = 1 to 50 mA, TJ= -40 to 125°C 3.86 IO = 1 mA 4.653 IO = 1 to 50 mA 4.630 4.771 IO = 1 to 50 mA, TJ= -40 to 125°C 4.535 4.864 V 4.14 4.7 4.747 IO = 1 mA 4.802 IO = 1 to 50 mA 4.777 4.923 IO = 1 to 50 mA, TJ= -40 to 125°C 4.68 5.02 4.85 V 4.899 V 9/23 Electrical characteristics Table 6. Symbol VO ΔVO LD2980ABxx - LD2980Cxx Electrical characteristics for LD2980C (continued) (TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1 µF (X7R), CO = 2.2 µF (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified) Parameter Output voltage Line regulation Test conditions Min. Typ. Max. IO = 1 mA 4.95 5 5.05 IO = 1 to 50 mA 4.925 IO = 1 to 50 mA, TJ= -40 to 125°C 4.825 VO(NOM) + 1 < VIN < 16 V, IO = 1 mA 5.075 TJ= -40 to 125°C 80 100 IO = 1 mA, TJ= -40 to 125°C IO = 10 mA 175 500 IO = 50 mA, TJ= -40 to 125°C 250 µA 700 1200 VINH < 0.18 V 0 VINH < 0.18 V, TJ= -40 to 125°C 1 IO = 0 1 IO = 0, TJ= -40 to 125°C 3 5 IO = 1mA Dropout voltage (1) 150 450 IO = 50 mA VDROP 100 200 IO = 10 mA, TJ= -40 to 125°C OFF MODE %/V 150 IO = 1 mA IQ 0.014 0.032 IO = 0, TJ= -40 to 125°C Quiescent current ON MODE V 5.175 0.003 IO = 0 Unit 7 IO = 1mA, TJ= -40 to 125°C 10 15 IO = 10mA 40 IO = 10mA, TJ= -40 to 125°C 60 mV 90 IO = 50mA 120 IO = 50mA, TJ= -40 to 125°C 150 225 Short circuit current RL = 0 150 mA SVR Supply voltage rejection CO = 10µF, f = 1kHz 63 dB VINH Inhibit input logic low LOW = Output OFF, TJ= -40 to 125°C 0.8 VINL Inhibit input logic high HIGH = Output ON, TJ= -40 to 125°C ISC IINH Inhibit input current eN Output noise voltage TSHDN Thermal shutdown 1.6 0.18 1.3 V VINH = 0V, TJ= -40 to 125°C 0 -1 VINH = 5V, TJ= -40 to 125°C 5 15 BW = 300 Hz to 50 kHz, CO = 10µF µF 160 µVRMS 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 LD2980ABxx - LD2980Cxx Typical performance characteristics 6 Typical performance characteristics Figure 4. (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 5. Output 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 LD2980ABxx - LD2980Cxx 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 LD2980ABxx - LD2980Cxx 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 = 4.7µF (X7R) VI = [VO(NOM) +1V], VO = 4.7V, IO = 100mA, CO = 4.7µF (X7R) 13/23 Application notes 7 Application notes 7.1 External capacitors LD2980ABxx - LD2980Cxx Like any low-dropout regulator, the LD2980 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 µF is required with the LD2980 (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 LD2980 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 4 and Figure 5 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 µF for output voltages equal or major than 3.8 V, 2.2 µF for output voltages from 2.85 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 (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 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. 14/23 LD2980ABxx - LD2980Cxx 7.6 Application notes Reverse current The power transistor used in the LD2980 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 µA. R1 and R2 resistors are implanted type; typical values are, respectively, 42.6 kΩ and 51.150 kΩ. Figure 22. Reverse current test circuit 15/23 Package mechanical data 8 LD2980ABxx - LD2980Cxx Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® 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 LD2980ABxx - LD2980Cxx 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 LD2980ABxx - LD2980Cxx 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 LD2980ABxx - LD2980Cxx 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 LD2980ABxx - LD2980Cxx Tape & reel SOT89 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 LD2980ABxx - LD2980Cxx 9 Order codes Table 7. Order codes Order codes AB Version C Version Output voltage SOT23-5L SOT-89 SOT23-5L SOT-89 LD2980CM18TR LD2980CU18TR 1.8 V LD2980CU30TR (1) 3.0 V LD2980ABM30TR LD2980ABU30TR (1) LD2980CM30TR (1) LD2980ABM33TR LD2980ABU33TR LD2980CM33TR LD2980ABM36TR LD2980ABM50TR LD2980ABU36TR (1) LD2980CM36TR LD2980CM50TR 3.3 V LD2980CU36TR (1) 3.6 V 5.0 V 1. Available on request. 21/23 Revision history LD2980ABxx - LD2980Cxx 10 Revision history Table 8. Document revision history Date Revision 03-Jul-2006 13 Order codes updated and new template. 13-Nov-2006 14 Add part number LD2980ABU18TR. 06-Sep-2007 15 Add Table 1 on page 1. 14-Feb-2008 16 Modified: Table 1 on page 1. 11-Jul-2008 17 Modified: Table 1 on page 1. 22/23 Changes LD2980ABxx - LD2980Cxx Please Read Carefully: Information in this document is provided solely in connection with ST products. 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