LK112 Low noise and low drop voltage regulator with shutdown function Datasheet - production data • Internal current and thermal limit • Operative input voltage from: – V + 0.5 to 14 V (for V > 2 V) or from OUT OUT 2.5 V to 14 V (for V < 2 V) OUT Description SOT23-5L The LK112 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 Features connected to the noise bypass pin to reduce the output noise level to 30 µVrms. An internal PNP • Output current up to 150 mA pass transistor is used to achieve a low-dropout • Low-dropout voltage (350 mV at I = 150 voltage. The LK112 has a very low quiescent OUT mA) current in on mode while in off mode Iq is reduced below 100 nA max. The internal thermal • Very low quiescent current: shutdown circuitry limits the junction temperature – 0.1 µA in OFF mode and max. 250 µA in below 150 °C. Load current is internally monitored ON mode at I = 0 mA OUT and the device shuts down in the presence of a • Low output noise: short-circuit or overcurrent condition on the – typ. 30 µV at I = 60 mA and 10 Hz < f < output. OUT 80 kHz • Wide range of output voltages Table 1. Device summary Order codes Output voltages LK112M15TR 1.5V LK112M18TR 1.8V LK112M25TR 2.5V LK112M33TR 3.3V LK112M50TR 5.0V LK112M55TR 5.5V LK112M60TR 6.0V LK112M80TR 8.0V April 2014 DocID7362 Rev 17 1/18 This is information on a product in full production. www.st.com

Contents LK112 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2/18 DocID7362 Rev 17

LK112 Diagram 1 Diagram Figure 1. Schematic diagram DocID7362 Rev 17 3/18 18

Pin configuration LK112 2 Pin configuration Figure 2. Pin connection (top view) Table 2. Pin description Pin n° Symbol Note Shutdown input disables the regulator when it is connected to GND or to positive 1 SHDN voltage less than 0.6 V Ground pin internally connected to the die attach flag to decrease the total thermal 2 GND resistance and increase the package ability to dissipate power 3 Bypass Bypass pin with 0.1 µF to improve the noise performance 4 OUT Output port 5 IN Input port 4/18 DocID7362 Rev 17

LK112 Maximum ratings 3 Maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit V DC input voltage 16 V I V DC input voltage 16 V SHDN I Output current Internally limited O T Storage temperature range -55 to 150 °C STG T Operating junction temperature range -40 to 125 °C OP Table 4. Thermal data Symbol Parameter SOT23-5L Unit R Thermal resistance junction-case 81 °C/W thJC R Thermal resistance junction-ambient 255 °C/W thJA DocID7362 Rev 17 5/18 18

Electrical characteristics LK112 4 Electrical characteristics T = 25 °C, V = V + 1 V, I = 0 mA, V = 1.8 V, C = 1 µF, C = 2.2 µF, J IN OUT OUT SHDN I O C =0.1 µF unless otherwise specified. BYPASS Table 5. LK112 electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit On mode (except I ) 175 250 µA SHDN I Quiescent current q Off mode, V = 8V, V = 0V 0 0.1 µA I SHDN V Output voltage I = 30mA -2 +2 % O O V = V +1V to V +6V, V ≤ 5.6V 0.7 20 mV ΔV Line regulation I O O O O V = V +1V to V +6V, V > 5.6V 0.8 40 mV I O O O I = 1 to 60mA 15 30 mV ΔV Load regulation O O I = 1 to 150mA 25 90 mV O I = 60mA (1) 0.17 0.24 V O V Dropout voltage d I = 150mA (1) 0.29 0.35 V O I Output current limit 150 mA O V = V +1.5V, C = 0.1µF SVR Supply voltage rejection I O BYP 55 dB C = 10µF, f = 400Hz, I = 30mA O O B= 10Hz to 80kHz, C = 0.1µF eN Output noise voltage BYP 30 µVrms C = 10µF, V = V +1.5V, I = 60mA O I O O I Shutdown input current V = 1.8V, output on 12 35 µA SHDN SHDN Output on 1.8 V Shutdown input logic V SHDN Output off 0.6 Output voltage ΔV /T I = 10mA 0.09 mV/°C O J temperature coefficient O 1. For versions with output voltage more than 2.1 V only. Note: For version with output voltage less than 2 V, V = 2.4 V. IN 6/18 DocID7362 Rev 17

LK112 Typical characteristics 5 Typical characteristics Unless otherwise specified, T = 25 °C, C = 1 µF, C = 2.2 µF, C = 100 nF J I O BYP Figure 3. Output voltage vs. temperature (V = 2.5V) Figure 4. Output voltage vs. temperature O (V = 3.8V) O Figure 5. Line regulation vs. temperature Figure 6. Load regulation vs. temperature DocID7362 Rev 17 7/18 18

Typical characteristics LK112 Figure 7. Dropout voltage vs. temperature Figure 8. Short-circuit current vs. dropout voltage Figure 9. Output voltage vs. input voltage Figure 10. Shutdown voltage vs. temperature 2.5 V 2 V 30 mA Figure 11. Shutdown current vs. shutdown Figure 12. Supply voltage rejection vs. voltage temperature (V = 2.5V) O 8/18 DocID7362 Rev 17

LK112 Typical characteristics Figure 13. Supply voltage rejection vs. output Figure 14. Supply voltage rejection vs. current frequency Figure 15. Supply voltage rejection vs. Figure 16. Quiescent current vs. temperature temperature (V = 3.8V) O Figure 17. Quiescent current vs. input voltage Figure 18. Quiescent current vs. shutdown voltage DocID7362 Rev 17 9/18 18

Typical characteristics LK112 Figure 19. Quiescent current vs. output current Figure 20. Reverse current vs. reverse voltage Figure 21. Stability Figure 22. Noise spectrum Figure 23. Start-up transient (C = 10 nF) Figure 24. Start-up transient (C = 100 nF) BYP BYP V=3.5V, V =2.5V, V = 0 to 1.8V, R =2.5kΩ, C=1µF, V=3.5V, V =2.5V, V = 0 to 1.8V, R =68Ω, C=1µF, I O SHDN L I I O SHDN L I C =4.7µF, C =10nF C =4.7µF, C =100nF O BYP O BYP 10/18 DocID7362 Rev 17

LK112 Typical characteristics Figure 25. Line transient (C = 100 µF) Figure 26. Line transient (C = 10 µF) o o V=3.5 to 4.5V, V =2.5V, V = 1.8V, I =30mA, no C, V=3.5 to 4.5V, V =2.5V, V = 1.8V, I =30mA, no C, I O SHDN O I I O SHDN O I C =100µF, C =10nF, t =t=2µs C =10µF, C =10nF, t =t=2µs O BYP s f O BYP s f Figure 27. Line transient (C = 1 µF) Figure 28. Load transient (C = 2.2 µF, o o C =10nF) BYP V=3.5 to 4.5V, V =2.5V, V = 1.8V, I =30mA, no C, V=3.5V, V =2.5V, V = 1.8V, I =50 to 100mA, C=1µF, I O SHDN O I I O SHDN O I C =1µF, C =1nF, t =t=2µs C =2.2µF, C =10nF, t =t=250ns O BYP s f O BYP s f DocID7362 Rev 17 11/18 18

Typical characteristics LK112 Figure 29. Load transient (C = 10 µF, Figure 30. Load transient (V = 3.8 V) o o C =100 nF) BYP V=3.5V, V =2.5V, V = 1.8V, I =50 to 100mA, C=1µF, V=4.8V, V =3.8V, V = 1.8V, I =50 to 100mA, C=1µF, I O SHDN O I I O SHDN O I C =10µF, C =100nF, t =t=250ns C =2.2µF, C =10nF, t =t=250ns O BYP s f O BYP s f 12/18 DocID7362 Rev 17

LK112 Package mechanical data 6 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 31.SOT23-5L mechanical drawings (cid:26)(cid:26)(cid:19)(cid:19)(cid:23)(cid:23)(cid:28)(cid:28)(cid:25)(cid:25)(cid:26)(cid:26)(cid:25)(cid:25)(cid:66)(cid:66)(cid:78)(cid:78) DocID7362 Rev 17 13/18 18

Package mechanical data LK112 Table 6. SOT23-5L mechanical data mm Dim. Min. Typ. Max. A 0.90 1.45 A1 0 0.15 A2 0.90 1.30 b 0.30 0.50 c 2.09 0.20 D 2.95 E 1.60 e 0.95 H 2.80 L 0.30 0.60 θ 0 8 Figure 32. SOT23-5L recommended footprint (dimensions in mm) (cid:26)(cid:19)(cid:23)(cid:28)(cid:25)(cid:26)(cid:25)(cid:66)(cid:78) 14/18 DocID7362 Rev 17

LK112 Packaging mechanical data 7 Packaging mechanical data Figure 33.Tape and reel SOT23-5L mechanical drawings DocID7362 Rev 17 15/18 18

Packaging mechanical data LK112 Figure 34. Tape and reel SOT23-5L mechanical data mm Dim. Min. Typ. Max. A 180 C 12.8 13.0 13.2 D 20.2 N 60 T 14.4 Ao 3.13 3.23 3.33 Bo 3.07 3.17 3.27 Ko 1.27 1.37 1.47 Po 3.9 4.0 4.1 P 3.9 4.0 4.1 16/18 DocID7362 Rev 17

LK112 Revision history 8 Revision history Table 7. Document revision history Date Revision Changes 31-Jan-2005 8 Change maturity code. 13-Jun-2006 9 Order codes updated and new template. 17-Oct-2006 10 The T value on table 2 has been updated. OP 18-Jul-2007 11 Add Table1 in cover page. 21-Sep-2007 12 Features updated. 11-Dec-2007 13 Modified: Table1. 12-Feb-2008 14 Modified: Table1. 10-Jul-2008 15 Modified: Table1 and Table1 on page1. 28-Feb-2011 16 Modified: Table1. Changed the part number LK112xx to LK112. Updated the Title in cover page and Table1: Device summary. Updated the features and description in cover page, Table2: Pin description, Figure3: Output voltage vs. temperature (VO= 2.5V), 24-Apr-2014 17 Figure4: Output voltage vs. temperature (VO= 3.8V), Section5: Typical characteristics, Section6: Package mechanical data. Added Section7: Packaging mechanical data. Minor text changes. DocID7362 Rev 17 17/18 18

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