LK112SXX

LK112Sxx Low noise low drop voltage regulator with shutdown function Features ■ ■ ■ Output current up to 200 mA Low dropout voltage (500 mV max at IOUT = 200 mA) Very low quiescent current: 0.1 µA in OFF mode and max 250 µA in ON mode at IOUT = 0 mA Low output noise: typ. 30 µV at IOUT = 60 mA and 10 Hz < f < 80 kHz Wide range of output voltages Internal current and thermal limit VOUT tolerance ± 2% (at 25 °C) Operative input voltage from: VOUT + 0.5 to 14 V (for VOUT > 2 V) or from 2.5 V to 14 V (for VOUT < 2 V) µVrms. An internal PNP pass transistor is used to achieve a low dropout voltage. The LK112Sxx has a very low quiescent current in ON MODE while in OFF MODE the Iq is reduced down to 100 nA max. The internal thermal shutdown circuitry limits the junction temperature to below 150 °C. The load current is internally monitored and the device will shutdown in the presence of a short circuit or overcurrent condition at the output. SOT23-5L ■ ■ ■ ■ ■ Description The LK112Sxx is a low dropout linear regulator with a built in electronic switch. The internal switch can be controlled by TTL or CMOS logic levels. The device is ON state when the control pin is pulled to a logic high level. An external capacitor can be used connected to the noise bypass pin to lower the output noise level to 30 Table 1. Device summary Part numbers LK112SXX13 LK112SXX14 LK112SXX18 LK112SXX19 LK112SXX20 LK112SXX21 LK112SXX22 LK112SXX23 July 2008 LK112SXX24 LK112SXX26 LK112SXX28 LK112SXX29 LK112SXX31 LK112SXX33 LK112SXX34 LK112SXX35 Rev 11 LK112SXX36 LK112SXX37 LK112SXX38 LK112SXX39 LK112SXX41 LK112SXX42 LK112SXX43 LK112SXX44 LK112SXX45 LK112SXX46 LK112SXX47 LK112SXX48 LK112SXX49 LK112SXX50 1/17 www.st.com 17 Contents LK112Sxx Contents 1 2 3 4 5 6 7 8 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 LK112Sxx Diagram 1 Figure 1. Diagram Schematic diagram 3/17 Pin configuration LK112Sxx 2 Figure 2. Pin configuration Pin connection (top view) Table 2. Pin n° 1 2 3 4 5 Pin description Symbol SHDN GND Bypass OUT IN Note Shutdown Input: Disables the regulator when is connected to GND or to positive voltage less than 0.6 V Ground Pin: Internally connected to the die attach flag to decrease the total thermal resistance and increase the package ability to dissipate power. Bypass Pin: Bypass with 0.1 µF to improve the VREF thermal noise performances. Output port Input port 4/17 LK112Sxx Maximum ratings 3 Table 3. Maximum ratings Absolute maximum ratings Parameter DC input voltage DC input voltage Output current Storage temperature range Operating junction temperature range Value 16 16 Internally limited -55 to 150 -40 to 125 °C °C Unit V V Symbol VI VSHDN IO TSTG TOP Table 4. Symbol RthJC RthJA Thermal data Parameter Thermal resistance junction-case Thermal resistance junction-ambient SOT23-5L 81 255 Unit °C/W °C/W 5/17 Electrical characteristics LK112Sxx 4 Table 5. Symbol Id VO ΔVO ΔVO Electrical characteristics Electrical characteristics for LK112S (TJ = 25 °C, VIN=VOUT+1 V (1), IOUT = 0mA, VSHDN = 1.8 V, CI = 1 µF, CO = 2.2 µF, CBYPASS = 0.1 µF unless otherwise specified) Parameter Quiescent current Output voltage Line regulation Test conditions ON MODE (except ISHDN) OFF MODE, VI = 8V, VSHDN = 0V IO = 30mA VI = VO+1V to VO+6V, VO ≤ 5.6V VI = VO+1V to VO+6V, VO > 5.6V IO = 1 to 60mA IO = 1 to 200mA Dropout voltage Short circuit current Supply voltage rejection Output noise voltage Shutdown input current Shutdown input logic Output OFF Output voltage temperature coefficient IO = 10mA 0.09 0.6 mV/°C VI = VO+1.5V, CBYP = 0.1µF CO = 10µF, f = 400Hz, IO = 30mA B= 10Hz to 80kHz, CBYP = 0.1µF CO = 10µF, VI = VO+1.5V, IO = 60mA VSHDN = 1.8V, Output ON Output ON 1.8 V IO = 60 mA (2) Min. Typ. 175 0 (see table) 0.7 0.8 15 30 0.17 0.35 Max. 250 0.1 Unit µA µA 20 40 30 90 0.24 0.5 mV mV mV mV V V mA Load regulation Vd ISC SVR eN ISHDN VSHDN ΔVO/TJ IO = 200 mA (2) 200 55 30 12 35 dB µVrms µA 1. For version with output voltage less than 2V VIN=2.4V 2. Only for version with output voltage more than 2.1V 6/17 LK112Sxx Typical characteristics 5 Figure 3. Typical characteristics (Unless otherwise specified, TJ = 25 °C, CI = 1 µF, CO = 2.2 µF, CBYP = 100 nF) Output voltage vs temperature Figure 4. Output voltage vs temperature Figure 5. Line regulation vs temperature Figure 6. Load regulation vs temperature Figure 7. Dropout voltage vs temperature Figure 8. Short circuit current vs dropout voltage 7/17 Typical characteristics LK112Sxx Figure 9. Output voltage vs input voltage Figure 10. Shutdown voltage vs temperature Figure 11. Shutdown current vs shutdown voltage Figure 12. Supply voltage rejection vs temperature Figure 13. Supply voltage rejection vs output current Figure 14. Supply voltage rejection vs frequency 8/17 LK112Sxx Typical characteristics Figure 15. Supply voltage rejection vs temperature Figure 16. Quiescent current vs temperature Figure 17. Quiescent current vs input voltage Figure 18. Quiescent current vs shutdown voltage Figure 19. Quiescent current vs temperature Figure 20. Reverse current vs reverse voltage 9/17 Typical characteristics LK112Sxx Figure 21. Stability Figure 22. Spectrum noise Figure 23. Start-up transient Figure 24. Start-up transient VI=3.5V, VO=2.5V, VSHDN= 0 to 1.8V, RL=2.5kΩ, CI=1µF, CO=4.7µF, CBYP=10nF VI=3.5V, VO=2.5V, VSHDN= 0 to 1.8V, RL=68Ω, CI=1µF, CO=4.7µF, CBYP=100nF Figure 25. Line transient Figure 26. Line transient VI=3.5 to 4.5V, VO=2.5V, VSHDN= 1.8V, IO=30mA, no CI, CO=100µF, CBYP=10nF, ts=tf=2µs VI=3.5 to 4.5V, VO=2.5V, VSHDN= 1.8V, IO=30mA, no CI, CO=10µF, CBYP=10nF, ts=tf=2µs 10/17 LK112Sxx Figure 27. Line transient Typical characteristics Figure 28. Load transient VI=3.5 to 4.5V, VO=2.5V, VSHDN= 1.8V, IO=30mA, no CI, CO=1µF, CBYP=1nF, ts=tf=2µs VI=3.5V, VO=2.5V, VSHDN= 1.8V, IO=50 to 100mA, CI=1µF, CO=2.2µF, CBYP=10nF, ts=tf=250ns Figure 29. Load transient Figure 30. Load transient VI=3.5V, VO=2.5V, VSHDN= 1.8V, IO=50 to 100mA, CI=1µF, CO=10µF, CBYP=100nF, ts=tf=250ns VI=4.8V, VO=3.8V, VSHDN= 1.8V, IO=50 to 100mA, CI=1µF, CO=2.2µF, CBYP=10nF, ts=tf=250ns 11/17 Package mechanical data LK112Sxx 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. 12/17 LK112Sxx Package mechanical data 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 13/17 Package mechanical data LK112Sxx 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. 14/17 LK112Sxx Order codes 7 Table 6. Order codes Order codes Output voltage 1.3V 1.4V 1.8V 1.9V 2.0V 2.1V 2.2V 2.3V 2.4V 2.6V 2.8V 2.9V 3.1V 3.3V 3.4V 3.5V 3.6V 3.7V 3.8V 3.9V 4.1V 4.2V 4.3V 4.4V 4.5V 4.6V 4.7V 4.8V 4.9V 5.0V VOUT Min. 1.24V 1.34V 1.74V 1.84V 1.94V 2.04V 2.14V 2.24V 2.34V 2.54V 2.74V 2.84V 3.04V 3.24V 3.335V 3.435V 3.535V 3.630V 3.725V 3.825V 4.020V 4.120V 4.215V 4.315V 4.410V 4.510V 4.605V 4.705V 4.800V 4.900V VOUT Max. 1.36V 1.46V 1.86V 1.96V 2.06V 2.16V 2.26V 2.36V 2.46V 2.66V 2.86V 2.96V 3.16V 3.36V 3.465V 3.565V 3.655V 3.770V 3.875V 3.975V 4.180V 4.280V 4.385V 4.485V 4.590V 4.690V 4.795V 4.895V 5.000V 5.100V Test voltage 2.4V 2.4V 2.4V 2.4V 3.0V 3.1V 3.2V 3.3V 3.4V 3.6V 3.8V 3.9V 4.1V 4.3V 4.4V 4.5V 4.6V 4.7V 4.8V 4.9V 5.1V 5.2V 5.3V 5.4V 5.5V 5.6V 5.7V 5.8V 5.9V 6.0V Part number LK112SM13TR (1) LK112SM14TR (1) LK112SM18TR LK112SM19TR LK112SM20TR LK112SM21TR (1) (1) (1) LK112SM22TR (1) LK112SM23TR LK112SM24TR LK112SM26TR (1) (1) (1) LK112SM28TR LK112SM29TR LK112SM31TR (1) (1) LK112SM33TR LK112SM34TR (1) LK112SM35TR LK112SM36TR LK112SM37TR (1) (1) (1) LK112SM38TR (1) LK112SM39TR LK112SM41TR LK112SM42TR (1) (1) (1) LK112SM43TR (1) LK112SM44TR LK112SM45TR LK112SM46TR (1) (1) (1) LK112SM47TR (1) LK112SM48TR LK112SM49TR (1) (1) LK112SM50TR 1. Available on request. 15/17 Revision history LK112Sxx 8 Table 7. Date Revision history Document revision history Revision 3 4 5 6 7 8 9 10 11 Mistake on fig. 19. Change maturity code. Order codes updated. The TOP value on table 2 updated. Add Table 1 in cover page. Features updated. Modified: Table 6. Modified: Table 6 on page 15. Modified: Table 1 on page 1 and Table 6 on page 15. Changes 31-Aug-2004 31-Jan-2005 12-Jun-2006 17-Oct-2006 20-Jul-2007 21-Sep-2007 11-Dec-2007 12-Feb-2008 10-Jul-2008 16/17 LK112Sxx 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. 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