LK112S Low noise and low drop voltage regulator with shutdown function Datasheet - production data Description The LK112S is a low-dropout linear regulator with shutdown function. The internal switch can be controlled by TTL or CMOS logic levels. The device is ON when the control pin is pulled to a high logic level. An external capacitor can be SOT23-5L connected to the noise bypass pin to reduce the output noise level to 30 µVrms. An internal PNP pass transistor is used to achieve a low-dropout voltage. Features The LK112S has a very low quiescent current in ON mode while in OFF mode the I is reduced to q • Output current up to 200 mA 100 nA max. The internal thermal shutdown • Low-dropout voltage (500 mV max. at I = circuitry limits the junction temperature below OUT 150 °C. The load current is internally monitored 200 mA) and in the presence of a short-circuit or • Very low quiescent current: 0.1 µA in OFF overcurrent conditions at the output, the device mode and max. 250 µA in ON mode at I = 0 OUT shuts down. mA • Low output noise: typ. 30 µV at I = 60 mA OUT and 10 Hz < f < 80 kHz • Wide range of output voltages • Internal current and thermal limit • V tolerance ± 2% (at 25 °C) OUT • Operative input voltage from: V + 0.5 to 14 OUT V (for V > 2 V) or from 2.5 V to 14 V (for OUT V < 2 V) OUT Table 1. Device summary Part number Output voltage LK112SM18TR 1.8 V LK112SM33TR 3.3 V LK112SM50TR 5.0 V February 2014 DocID8059 Rev 12 1/17 This is information on a product in full production. www.st.com

Contents LK112S Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 DocID8059 Rev 12

LK112S Diagram 1 Diagram Figure 1. Schematic diagram DocID8059 Rev 12 3/17 17

Pin configuration LK112S 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 a positive 1 SHDN voltage lower 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: 0.1 µF bypass to improve thethermal noise performance 4 OUT Output port 5 IN Input port 4/17 DocID8059 Rev 12

LK112S 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 DocID8059 Rev 12 5/17 17

Electrical characteristics LK112S 4 Electrical characteristics T = 25 °C, V = V +1 V, I = 0 mA, V = 1.8 V, C = 1 µF, C = 2.2 µF, C = J IN OUT OUT SHDN I O BYPASS 0.1 µF unless otherwise specified. Table 5. LK112S electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit ON mode (except I ) 175 250 µA SHDN I Quiescent current d OFF mode, V = 8 V, V = 0 V 0 0.1 µA I SHDN V Output voltage I = 30 mA -2 +2 % O O V = V +1 V to V +6 V, V ≤ 5.6 V 0.7 20 mV ΔV Line regulation I O O O O V = V +1 V to V +6 V, V > 5.6 V 0.8 40 mV I O O O I = 1 to 60 mA 15 30 mV ΔV Load regulation O O I = 1 to 200 mA 30 90 mV O I = 60 mA 0.17 0.24 V O V Dropout voltage d I = 200 mA(1) 0.35 0.5 V O I Short-circuit current 200 mA SC V = V +1.5 V, C = 0.1 µF SVR Supply voltage rejection I O BYP 55 dB C = 10 µF, f = 400 Hz, I = 30 mA O O B= 10 Hz to 80 kHz, C = 0.1 µF eN Output noise voltage BYP 30 µVrms C = 10 µF, V = V +1.5 V, I = 60 mA O I O O I Shutdown input current V = 1.8 V, 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 = 10 mA 0.09 mV/°C O J temperature coefficient O 1. For versions with an output voltage higher than 2.1 V only. Note: For versions with an output voltage lower than 2 V VIN = 2.4 V 6/17 DocID8059 Rev 12

LK112S 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 Figure 4. Output voltage vs temperature V =2.5 V V =3.8 V out out Figure 5. Line regulation vs temperature Figure 6. Load regulation vs temperature DocID8059 Rev 12 7/17 17

Typical characteristics LK112S 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 8/17 DocID8059 Rev 12

LK112S 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. Shutdown current vs temperature temperature Figure 17. Quiescent current vs input voltage Figure 18. Quiescent current vs shutdown voltage DocID8059 Rev 12 9/17 17

Typical characteristics LK112S Figure 19. Quiescent current vs temperature 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 10/17 DocID8059 Rev 12

LK112S Typical characteristics Figure 25. Line transient Co=100 µF Figure 26. Line transient Co=10 µF 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 Co=1 µF Figure 28. Load transient Vo=2.5 V, Co=2.2 µF 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 Figure 29. Load transient Vo=2.5 V, Co=10 µF Figure 30. Load transient Vo=3.8 V,Co=2.2 µF 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 DocID8059 Rev 12 11/17 17

Package mechanical data LK112S 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:19)(cid:23)(cid:28)(cid:25)(cid:26)(cid:25)(cid:66)(cid:78) 12/17 DocID8059 Rev 12

LK112S Package mechanical data 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) DocID8059 Rev 12 13/17 17

Packaging mechanical data LK112S 7 Packaging mechanical data Figure 33.SOT23-5L tape and reel drawings 14/17 DocID8059 Rev 12

LK112S Packaging mechanical data Figure 34.SOT23-5L tape and reel 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 DocID8059 Rev 12 15/17 17

Revision history LK112S 8 Revision history Table 7. Document revision history Date Revision Changes 31-Aug-2004 3 Mistake on fig. 19. 31-Jan-2005 4 Change maturity code. 12-Jun-2006 5 Order codes updated. 17-Oct-2006 6 The T value on table 2 updated. OP 20-Jul-2007 7 Add Table1 in cover page. 21-Sep-2007 8 Features updated. 11-Dec-2007 9 Modified: Table6. 12-Feb-2008 10 Modified: Table6. 10-Jul-2008 11 Modified: Table1 and Table6. Part number LK112Sxx changed to LK112S. Updated the title and the Description in cover page, Table2: Pin description, 11-Feb-2014 12 Section5: Typical characteristics and Section6: Package mechanical data. Added Section7: Packaging mechanical data. Minor text changes. 16/17 DocID8059 Rev 12

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