LD2979XX50

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. Device summary Part numbers LD2979XX30 LD2979XX33 LD2979XX38 LD2979XX50 Order codes LD2979M30TR LD2979M33TR LD2979M38TR LD2979M50TR Rev 14 Output voltages 3.0 V 3.3 V 3.8 V 5.0 V 1/15 www.st.com 15 April 2008 Contents LD2979xx Contents 1 2 3 4 5 6 7 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2/15 LD2979xx Diagram 1 Figure 1. Diagram Schematic diagram 3/15 Pin configuration LD2979xx 2 Figure 2. Pin configuration Pin connections (top view) SOT23-5L Table 2. Pin description Name and function Input voltage Ground Control switch ON/OFF (1) Not to be connected Output voltage Pin number 1 2 3 4 5 Symbol VI GND INHIBIT NC VO 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 Table 3. Maximum ratings Absolute maximum ratings Parameter DC input voltage DC inhibit input voltage Output current Power dissipation Storage temperature range Operating junction temperature range Value 16 VIN Internally limited Internally limited -40 to 150 -25 to 125 °C °C Unit V V Symbol VI VINH IO PD TSTG TOP Note: 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 Table 4. Symbol VO Electrical characteristics 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). Parameter Output voltage Test conditions VIN = 3.85 V IO = 1 to 50mA, Ta= -25 to 125°C Output voltage VIN = 4 V IO = 1 to 50mA, Ta= -25 to 125°C Output voltage VIN = 4.3 V IO = 1 to 50mA, Ta= -25 to 125°C Output voltage VIN = 4.8 V IO = 1 to 50mA, Ta= -25 to 125°C Output voltage Output current limit Line regulation VIN = VO(NOM)+1V to 16V, IO = 1mA Ta= -25 to 125°C IO = 0 Quiescent current (On Mode) Id Quiescent current (Off Mode) SVR Supply voltage rejection IO = 0, Ta= -25 to 125°C IO = 50mA IO = 50mA, Ta= -25 to 125°C VINH < 0.18 V VINH < 0.18 V, Ta= -25 to 125°C IO = 50mA, COUT = 10μF, f = 120Hz IO = 0 IO = 0, Ta= -25 to 125°C IO = 1mA Vd Dropout voltage IO = 1mA, Ta= -25 to 125°C IO = 10mA IO = 10mA, Ta= -25 to 125°C IO = 50mA IO = 50mA, Ta= -25 to 125°C VIL VIH Inhibit input logic low Inhibit input logic high Device Off, Ta= -25 to 125°C Device On, Ta= -25 to 125°C 2 200 100 30 63 6 12 18 60 90 mV 200 300 400 600 0.18 V V 0 µA 1 dB 500 80 VIN = 6 V IO = 1 to 50mA, Ta= -25 to 125°C Min. 2.793 2.736 2.940 2.880 3.234 3.168 3.724 3.648 4.9 4.8 100 0.028 0.064 110 170 µA 700 1300 %/VIN 5 3.8 3.3 3 Typ. 2.85 Max. 2.907 V 2.964 3.060 V 3.120 3.366 V 3.432 3.876 V 3.952 5.1 V 5.2 mA Unit VO VO VO VO IO ΔVO 6/15 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 Test conditions VINH = 0 V VINH = 5V, Ta= -25 to 125°C Min. Typ. 0 5 160 Max. -1 µA 15 µV Unit Inhibit input current Output noise voltage (RMS) BW= 300Hz to 50kHz, CO = 10µF 7/15 Typical characteristics LD2979xx 5 Figure 3. Typical characteristics (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 Typical characteristics Figure 9. Short circuit current vs dropout voltage Figure 10. Inhibit voltage vs temperature Figure 11. Supply voltage rejection vs frequency 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 LD2979xx Figure 15. Line transient response CO = 10µF (ESR = 1 at 1kHz) 10/15 LD2979xx Package mechanical data 6 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. Dim. Min. A A1 A2 b C D E e H L 2.60 0.10 0.90 0.00 0.90 0.35 0.09 2.80 1.50 0.95 3.00 0.60 102.3 3.9 Typ. Max. 1.45 0.10 1.30 0.50 0.20 3.00 1.75 Min. 35.4 0.0 35.4 13.7 3.5 110.2 59.0 37.4 118.1 23.6 Typ. Max. 57.1 3.9 51.2 19.7 7.8 118.1 68.8 mils. 7049676D 12/15 LD2979xx Package mechanical data Tape & reel SOT23-xL mechanical data mm. Dim. Min. A C D N T Ao Bo Ko Po P 3.13 3.07 1.27 3.9 3.9 3.23 3.17 1.37 4.0 4.0 12.8 20.2 60 14.4 3.33 3.27 1.47 4.1 4.1 0.123 0.120 0.050 0.153 0.153 0.127 0.124 0.054 0.157 0.157 13.0 Typ. Max. 180 13.2 0.504 0.795 2.362 0.567 0.131 0.128 0.0.58 0.161 0.161 0.512 Min. Typ. Max. 7.086 0.519 inch. 13/15 Revision history LD2979xx 7 Table 5. Date Revision history Document revision history Revision 10 11 12 13 14 Add tape & reel for TO-92. Order codes updated. Order codes updated. Order codes updated. Modified: Table 1 on page 1. Changes 15-Mar-2005 03-Jul-2006 16-May-2007 08-Jun-2007 09-Apr-2008 14/15 LD2979xx Please Read Carefully: Information in this document is provided solely in connection with ST products. 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