LD2979xx Very low drop voltage regulators with inhibit Features ■ Very low dropout voltage (0.2 V typ. at 50 mA load) ■ Very low quiescent current (typ. 500 µA at 50 mA load) ■ Output current up to 50 mA ■ Logic-controlled electronic shutdown ■ Output voltages of 3.0; 3.3; 3.8; 5.0 V ■ Internal current and thermal limit ■ Supply voltage rejection: 63 dB (typ) ■ Only 1 µF for stability ■ Selection at 25 °C ■ Temperature range: -25 °C to 125 °C ■ Package available: SOT23-5L SOT23-5L Description The LD2979 series are very low drop regulators available in SOT23-5L. The very low drop-voltage and the very low quiescent current make them particularly suitable for low noise, low power applications and in battery powered systems. Shutdown logic control function is available on five pin version (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. April 2008 Device summary Part numbers Order codes Output voltages LD2979XX30 LD2979M30TR 3.0 V LD2979XX33 LD2979M33TR 3.3 V LD2979XX38 LD2979M38TR 3.8 V LD2979XX50 LD2979M50TR 5.0 V Rev 14 1/15 www.st.com 15 Contents LD2979xx Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2/15 LD2979xx Diagram 1 Diagram Figure 1. Schematic diagram 3/15 Pin configuration LD2979xx 2 Pin configuration Figure 2. Pin connections (top view) SOT23-5L Table 2. Pin description Symbol VI Name and function Pin number Input voltage 1 Ground 2 Control switch ON/OFF (1) 3 NC Not to be connected 4 VO Output voltage 5 GND INHIBIT 1. Inhibit pin is not internally pulled-up then it must not be left floating. Connect to a positive voltage higher than 2 V to able the device. 4/15 LD2979xx Maximum ratings 3 Maximum ratings Table 3. Absolute maximum ratings Symbol VI VINH Note: Parameter Value Unit DC input voltage 16 V DC inhibit input voltage VIN V IO Output current Internally limited PD Power dissipation Internally limited TSTG Storage temperature range -40 to 150 °C TOP Operating junction temperature range -25 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. 5/15 Electrical characteristics LD2979xx 4 Electrical characteristics Table 4. Electrical characteristics for LD2979xx (refer to the test circuits, Ta = 25 °C, VIN = VO(NOM) + 1 V, IO = 1 mA, VINH = 2 V, CO = 1 µF, unless otherwise specified). Symbol Parameter VO Output voltage VO Output voltage VO Output voltage VO Output voltage VO Output voltage IO Output current limit ΔVO Line regulation Test conditions Min. Typ. Max. VIN = 3.85 V 2.793 2.85 2.907 IO = 1 to 50mA, Ta= -25 to 125°C 2.736 VIN = 4 V 2.940 IO = 1 to 50mA, Ta= -25 to 125°C 2.880 VIN = 4.3 V 3.234 IO = 1 to 50mA, Ta= -25 to 125°C 3.168 VIN = 4.8 V 3.724 IO = 1 to 50mA, Ta= -25 to 125°C 3.648 V Id 3 Supply voltage rejection 3.3 V 3.8 VIN = 6 V 4.9 IO = 1 to 50mA, Ta= -25 to 125°C 4.8 3.952 5 5.1 V 5.2 100 mA VIN = VO(NOM)+1V to 16V, IO = 1mA 0.028 Ta= -25 to 125°C 0.064 80 IO = 0, Ta= -25 to 125°C 110 µA IO = 50mA 500 700 1300 VINH < 0.18 V 0 µA VINH < 0.18 V, Ta= -25 to 125°C 1 IO = 50mA, COUT = 10μF, f = 120Hz 63 IO = 0 6 dB 12 18 30 IO = 1mA, Ta= -25 to 125°C 60 90 mV IO = 10mA 100 200 300 IO = 50mA 200 400 IO = 50mA, Ta= -25 to 125°C 600 0.18 VIL Inhibit input logic low Device Off, Ta= -25 to 125°C VIH Inhibit input logic high Device On, Ta= -25 to 125°C %/VIN 170 IO = 10mA, Ta= -25 to 125°C 6/15 3.876 V IO = 1mA Dropout voltage 3.366 3.432 IO = 0, Ta= -25 to 125°C Vd 3.060 3.120 IO = 50mA, Ta= -25 to 125°C Quiescent current (Off Mode) SVR 2.964 V IO = 0 Quiescent current (On Mode) Unit 2 V V LD2979xx Table 4. Symbol II eN Electrical characteristics Electrical characteristics for LD2979xx (continued) (refer to the test circuits, Ta = 25 °C, VIN = VO(NOM) + 1 V, IO = 1 mA, VINH = 2 V, CO = 1 µF, unless otherwise specified). Parameter Inhibit input current Output noise voltage (RMS) Test conditions Typ. Max. VINH = 0 V 0 -1 VINH = 5V, Ta= -25 to 125°C 5 15 BW= 300Hz to 50kHz, CO = 10µF Min. Unit µA 160 µV 7/15 Typical characteristics LD2979xx 5 Typical characteristics Figure 3. (unless otherwise specified TA = 25 °C) Output voltage vs temperature Figure 4. Output voltage vs input voltage Figure 5. Output voltage vs input voltage Figure 6. Dropout voltage vs output current Figure 7. Dropout voltage vs temperature Figure 8. Quiescent current vs temperature 8/15 LD2979xx Figure 9. Typical characteristics Short circuit current vs dropout voltage Figure 11. Supply voltage rejection vs frequency Figure 10. Inhibit voltage vs temperature Figure 12. Load transient response CO = 10µF (ESR = 1 at 1kHz) Figure 13. Inhibit current vs temperature Figure 14. Load transient response CO = 10µF (ESR = 1 at 1kHz) 9/15 Typical characteristics Figure 15. Line transient response CO = 10µF (ESR = 1 at 1kHz) 10/15 LD2979xx LD2979xx 6 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. 11/15 Package mechanical data LD2979xx 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 12/15 LD2979xx 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 13/15 Revision history LD2979xx 7 Revision history Table 5. Document revision history Date Revision 15-Mar-2005 10 Add tape & reel for TO-92. 03-Jul-2006 11 Order codes updated. 16-May-2007 12 Order codes updated. 08-Jun-2007 13 Order codes updated. 09-Apr-2008 14 Modified: Table 1 on page 1. 14/15 Changes LD2979xx 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. 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