LD2982Axx LD2982Bxx Very low drop and low noise voltage regulator with inhibit function, low ESR capacitors compatible Features ■ Very low dropout voltage (120 mV at 50 mA and 7 mV at 1 mA load) ■ Very low quiescent current (375 mA typ. at 50 mA load and 75 mA at 1 mA) ■ Output current up to 50 mA ■ Logic controlled electronic shutdown ■ Output voltage of 1.8, 2.7, 3.2, 3.3 V ■ Internal current and thermal limit ■ Available in ± 1 % tolerance (at 25 °C, A version) ■ Supply voltage rejection: 45 dB (typ) ■ Only 1 µF for stability ■ Low output noise voltage 30 µVrms ■ Smallest package SOT23-5L ■ Temperature range: -40 °C to 125 °C SOT23-5L An external capacitor CBYP = 10 nF connected between bypass pin and GND reduce the noise to 30 µVrms. Typical application are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera. Description The LD2982A/Bxx is a 50 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 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. Table 1. Device summary Part numbers July 2008 A Version B Version Output voltage LD2982AXX18 LD2982BXX18 1.8 V LD2982AXX27 LD2982BXX27 2.7 V LD2982AXX32 LD2982BXX32 3.2 V Rev 6 1/20 www.st.com 20 LD2982Axx - LD2982Bxx Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.1 External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.2 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.3 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.4 Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.5 Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.6 Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/20 LD2982Axx - LD2982Bxx 1 Diagram Figure 1. Schematic diagram Diagram 3/20 Pin configuration LD2982Axx - LD2982Bxx 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 4/20 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 LD2982Axx - LD2982Bxx 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. 5/20 Electrical characteristics LD2982Axx - LD2982Bxx 4 Electrical characteristics Table 5. Electrical characteristics for LD2982A (TJ = 25 °C, VI = VO + 1 V, IO =1 mA, VSHDN = 2V, CI = CO = 1 µF, unless otherwise specified). Symbol VOP VO VO VO VO VO VO VO VO VO VO VO VO 6/20 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 1.515 2.5 VI = 2.5V 1.485 IO = 1 to 50mA 1.477 1.523 IO = 1 to 50mA, TJ= -40 to 125°C 1.470 1.530 VI = 2.8V 1.782 IO = 1 to 50mA 1.773 1.827 IO = 1 to 50mA, TJ= -40 to 125°C 1.764 1.836 VI = 3.5V 2.475 1.8 2.5 1.818 V 2.525 IO = 1 to 50mA 2.462 2.537 IO = 1 to 50mA, TJ= -40 to 125°C 2.45 2.55 VI = 3.8V 2.772 IO = 1 to 50mA 2.758 2.8 V V 2.828 2.842 IO = 1 to 50mA, TJ= -40 to 125°C 2.744 VI = 3.85V 2.821 IO = 1 to 50mA 2.807 2.893 IO = 1 to 50mA, TJ= -40 to 125°C 2.793 2.907 VI = 4.0V 2.970 IO = 1 to 50mA 2.955 3.045 IO = 1 to 50mA, TJ= -40 to 125°C 2.94 3.06 VI = 4.1V 3.069 V 2.856 2.85 3.0 3.1 2.879 3.030 V 3.131 IO = 1 to 50mA 3.053 3.146 IO = 1 to 50mA, TJ= -40 to 125°C 3.038 3.162 VI = 4.2V 3.168 IO = 1 to 50mA 3.152 3.2 V V 3.232 3.248 IO = 1 to 50mA, TJ= -40 to 125°C 3.136 VI = 4.3V 3.267 IO = 1 to 50mA 3.250 3.349 IO = 1 to 50mA, TJ= -40 to 125°C 3.234 3.366 VI = 4.5V 3.465 IO = 1 to 50mA 3.447 3.552 IO = 1 to 50mA, TJ= -40 to 125°C 3.43 3.57 VI = 4.6V 3.564 V 3.264 3.3 3.5 3.6 3.333 3.535 V 3.636 IO = 1 to 50mA 3.546 3.654 IO = 1 to 50mA, TJ= -40 to 125°C 3.528 3.672 VI = 4.8V 3.762 IO = 1 to 50mA 3.743 3.857 IO = 1 to 50mA, TJ= -40 to 125°C 3.724 3.876 3.8 V V 3.838 V LD2982Axx - LD2982Bxx Table 5. Symbol VO VO VO Electrical characteristics Electrical characteristics for LD2982A (continued) (TJ = 25 °C, VI = VO + 1 V, IO =1 mA, VSHDN = 2V, CI = CO = 1 µF, unless otherwise specified). Parameter Output voltage Output voltage Output voltage Test conditions Min. Typ. Max. VI = 5.0V 3.96 4 4.04 IO = 1 to 50mA 3.94 IO = 1 to 50mA, TJ= -40 to 125°C 3.92 VI = 5.7V 4.653 IO = 1 to 50mA 4.629 4.77 IO = 1 to 50mA, TJ= -40 to 125°C 4.606 4.794 Short circuit current 4.95 4.925 5.075 4.9 5.1 Line regulation 5 0.003 VI = VO + 1V to 16V, IO = 1 mA, TJ= -40 to 125°C 3 7 10 Dropout voltage IO = 1mA, TJ= -40 to 125°C 15 IO = 10mA 40 60 120 150 IO = 10mA, TJ= -40 to 125°C IO = 50mA, TJ= -40 to 125°C 225 IO = 0 80 IO = 0, TJ= -40 to 125°C 100 IO = 1mA, TJ= -40 to 125°C IO = 10mA 200 600 IO = 50mA, TJ= -40 to 125°C VIL 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 900 0 VINH<0.18V, TJ= -40 to 125°C CBYP = 0.01µF, CO = 10µF, f = 1kHz µA 1200 VINH<0.18V Supply voltage rejection 300 400 IO = 50mA SVR 150 200 IO = 10mA, TJ= -40 to 125°C OFF MODE 100 150 IO = 1mA IQ mV 90 IO = 50mA Quiescent current ON MODE %/VI 5 IO = 1mA VDROP 0.014 1 IO = 0, TJ= -40 to 125°C V mA 0.032 IO = 0 V 5.05 150 VI = VO + 1V to 16V, IO = 1 mA ΔVO/ΔVI 4.747 IO = 1 to 50mA RL = 0 V 4.08 4.7 VI = 6.0V IO = 1 to 100 mA, TJ= -40 to 125°C ISC 4.06 Unit 1 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 7/20 Electrical characteristics Table 6. Symbol VOP LD2982Axx - LD2982Bxx Electrical characteristics for LD2982B (TJ = 25 °C, VI = VO + 1 V, IO = 1 mA, VSHDN = 2 V, CI = CO = 1 µF, unless otherwise specified). Parameter Test conditions Operating input voltage VO VO VO VO VO VO VO VO VO VO VO 8/20 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 VI = 2.5V VO Min. 1.477 1.5 Max. Unit 16 V 1.523 IO = 1 to 50mA 1.470 1.530 IO = 1 to 50mA, TJ= -40 to 125°C 1.447 1.553 VI = 2.8V 1.773 IO = 1 to 50mA 1.764 1.8 V 1.827 1.836 IO = 1 to 50mA, TJ= -40 to 125°C 1.737 VI = 3.5V 2.462 IO = 1 to 50mA 2.45 2.55 IO = 1 to 50mA, TJ= -40 to 125°C 2.412 2.587 VI = 3.8V 2.758 IO = 1 to 50mA 2.744 2.856 IO = 1 to 50mA, TJ= -40 to 125°C 2.702 2.898 VI = 3.85V 2.807 V 1.863 2.5 2.8 2.85 2.537 2.842 V 2.893 IO = 1 to 50mA 2.793 2.907 IO = 1 to 50mA, TJ= -40 to 125°C 2.750 2.950 VI = 4.0V 2.955 IO = 1 to 50mA 2.94 3.0 V V 3.045 3.06 IO = 1 to 50mA, TJ= -40 to 125°C 2.895 VI = 4.1V 3.053 IO = 1 to 50mA 3.038 3.162 IO = 1 to 50mA, TJ= -40 to 125°C 2.991 3.208 VI = 4.2V 3.152 IO = 1 to 50mA 3.136 3.264 IO = 1 to 50mA, TJ= -40 to 125°C 3.088 3.312 VI = 4.3V 3.250 V 3.105 3.1 3.2 3.3 3.146 3.248 V 3.349 IO = 1 to 50mA 3.234 3.366 IO = 1 to 50mA, TJ= -40 to 125°C 3.184 3.415 VI = 4.5V 3.447 IO = 1 to 50mA 3.430 3.5 V V 3.552 3.370 IO = 1 to 50mA, TJ= -40 to 125°C 3.377 VI = 4.6V 3.546 IO = 1 to 50mA 3.528 3.672 IO = 1 to 50mA, TJ= -40 to 125°C 3.474 3.726 VI = 4.8V 3.743 IO = 1 to 50mA 3.724 3.876 IO = 1 to 50mA, TJ= -40 to 125°C 3.667 3.933 V 3.662 3.6 3.8 3.654 V 3.857 V LD2982Axx - LD2982Bxx Table 6. Symbol VO VO VO Electrical characteristics Electrical characteristics for LD2982B (continued) (TJ = 25 °C, VI = VO + 1 V, IO = 1 mA, VSHDN = 2 V, CI = CO = 1 µF, unless otherwise specified). Parameter Output voltage Output voltage Output voltage Test conditions Min. Typ. Max. VI = 5.0V 3.94 4 4.06 IO = 1 to 50mA 3.92 IO = 1 to 50mA, TJ= -40 to 125°C 3.86 VI = 5.7V 4.629 IO = 1 to 50mA 4.606 4.794 IO = 1 to 50mA, TJ= -40 to 125°C 4.535 4.864 VI = 6.0V 4.925 IO = 1 to 50mA IO = 1 to 100 mA, TJ= -40 to 125°C ISC Short circuit current Line regulation 5 5.175 400 0.003 VI = VO + 1V to 16V, IO = 1 mA, TJ= -40 to 125°C 1 3 7 10 IO = 1mA, TJ= -40 to 125°C 15 IO = 10mA 40 60 120 150 IO = 10mA, TJ= -40 to 125°C IO = 50mA, TJ= -40 to 125°C 80 IO = 0, TJ= -40 to 125°C 100 IO = 1mA, TJ= -40 to 125°C IO = 10mA 200 IO = 10mA, TJ= -40 to 125°C 600 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 900 0 VINH<0.18V, TJ= -40 to 125°C VIL µA 1200 VINH<0.18V CBYP = 0.01µF, CO = 10µF, f = 1kHz 300 400 IO = 50mA, TJ= -40 to 125°C Supply voltage rejection 150 200 IO = 50mA SVR 100 150 IO = 1mA OFF MODE mV 225 IO = 0 IQ %/VI 90 IO = 50mA Quiescent current ON MODE 0.014 5 IO = 1mA Dropout voltage V mA 0.032 IO = 0, TJ= -40 to 125°C V 5.075 4.825 IO = 0 VDROP 4.77 5.1 RL = 0 V 4.14 4.7 4.9 VI = VO + 1V to 16V, IO = 1 mA ΔVO/ΔVI 4.08 Unit 1 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 9/20 Typical characteristics LD2982Axx - LD2982Bxx 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. 10/20 LD2982Axx - LD2982Bxx Figure 9. Supply voltage rejection vs output current Typical characteristics 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 11/20 Typical characteristics LD2982Axx - LD2982Bxx 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 12/20 LD2982Axx - LD2982Bxx 6 Application notes 6.1 External capacitors Application notes Like any low-dropout regulator, the LD2982 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 LD2982 (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 LD2982 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. 13/20 Application notes 6.6 LD2982Axx - LD2982Bxx Reverse current The power transistor used in the LD2982 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 14/20 LD2982Axx - LD2982Bxx 7 Package mechanical data 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. 15/20 Package mechanical data LD2982Axx - LD2982Bxx 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 16/20 LD2982Axx - LD2982Bxx 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 17/20 Order codes 8 Order codes Table 7. Order codes 18/20 LD2982Axx - LD2982Bxx A Version B Version Output voltage LD2982AM18R LD2982BM18R 1.8 V LD2982AM27R LD2982BM27R 2.7 V LD2982AM32R LD2982BM32R 3.2 V LD2982Axx - LD2982Bxx Revision history 9 Revision history Table 8. Document revision history Date Revision Changes 25-Jul-2006 4 Order codes updated. 14-Feb-2008 5 Added: Table 1 on page 1. 10-Jul-2008 6 Modified: Table 1 on page 1 and Table 7 on page 18. 19/20 LD2982Axx - LD2982Bxx 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. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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