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. 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. SOT23-5L 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. Device summary Part numbers LK112SXX13 LK112SXX24 LK112SXX36 LK112SXX45 LK112SXX14 LK112SXX26 LK112SXX37 LK112SXX46 LK112SXX18 LK112SXX28 LK112SXX38 LK112SXX47 LK112SXX19 LK112SXX29 LK112SXX39 LK112SXX48 LK112SXX20 LK112SXX31 LK112SXX41 LK112SXX49 LK112SXX21 LK112SXX33 LK112SXX42 LK112SXX50 LK112SXX22 LK112SXX34 LK112SXX43 LK112SXX23 LK112SXX35 LK112SXX44 July 2008 Rev 11 1/17 www.st.com 17 Contents LK112Sxx 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 Order codes 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 LK112Sxx Diagram 1 Diagram Figure 1. Schematic diagram 3/17 Pin configuration LK112Sxx 2 Pin configuration Figure 2. Pin connection (top view) Table 2. Pin description 4/17 Pin n° Symbol 1 SHDN 2 GND 3 Bypass 4 OUT 5 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 LK112Sxx Maximum ratings 3 Maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit VI DC input voltage 16 V VSHDN DC input voltage 16 V IO Output current Internally limited TSTG Storage temperature range -55 to 150 °C TOP Operating junction temperature range -40 to 125 °C Table 4. Symbol Thermal data Parameter SOT23-5L Unit RthJC Thermal resistance junction-case 81 °C/W RthJA Thermal resistance junction-ambient 255 °C/W 5/17 Electrical characteristics LK112Sxx 4 Electrical characteristics Table 5. 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) Symbol Parameter Id Quiescent current VO Output voltage ΔVO Line regulation ΔVO Load regulation Test conditions Min. ON MODE (except ISHDN) OFF MODE, VI = 8V, VSHDN = 0V Vd Dropout voltage ISC Short circuit current IO = 30mA Typ. Max. Unit 175 250 µA 0 0.1 µA (see table) VI = VO+1V to VO+6V, VO ≤ 5.6V 0.7 20 mV VI = VO+1V to VO+6V, VO > 5.6V 0.8 40 mV IO = 1 to 60mA 15 30 mV IO = 1 to 200mA 30 90 mV 0.17 0.24 V 0.35 0.5 V IO = 60 mA (2) IO = 200 mA (2) 200 mA Supply voltage rejection VI = VO+1.5V, CBYP = 0.1µF CO = 10µF, f = 400Hz, IO = 30mA 55 dB Output noise voltage B= 10Hz to 80kHz, CBYP = 0.1µF CO = 10µF, VI = VO+1.5V, IO = 60mA 30 µVrms ISHDN Shutdown input current VSHDN = 1.8V, Output ON 12 VSHDN Shutdown input logic ΔVO/TJ Output voltage temperature coefficient SVR eN Output ON µA 1.8 V Output OFF IO = 10mA 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 35 0.6 0.09 mV/°C LK112Sxx Typical characteristics 5 Typical characteristics Figure 3. (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 Figure 9. Output voltage vs input voltage LK112Sxx 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 Figure 15. Supply voltage rejection vs temperature Typical characteristics 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 Typical characteristics Figure 27. Line transient 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 6 LK112Sxx 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. 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 13/17 Package mechanical data LK112Sxx Tape & reel SOT23-xL mechanical data mm. inch. Dim. Min. Typ. A Min. Typ. 180 13.0 13.2 Max. 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 14/17 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 LK112Sxx Order codes 7 Order codes Table 6. Order codes Part number Output voltage VOUT Min. VOUT Max. Test voltage LK112SM13TR (1) 1.3V 1.24V 1.36V 2.4V (1) 1.4V 1.34V 1.46V 2.4V LK112SM14TR LK112SM18TR 1.8V 1.74V 1.86V 2.4V LK112SM19TR (1) 1.9V 1.84V 1.96V 2.4V LK112SM20TR (1) 2.0V 1.94V 2.06V 3.0V LK112SM21TR (1) 2.1V 2.04V 2.16V 3.1V LK112SM22TR (1) 2.2V 2.14V 2.26V 3.2V LK112SM23TR (1) 2.3V 2.24V 2.36V 3.3V LK112SM24TR (1) 2.4V 2.34V 2.46V 3.4V LK112SM26TR (1) 2.6V 2.54V 2.66V 3.6V LK112SM28TR 2.8V 2.74V 2.86V 3.8V LK112SM29TR (1) 2.9V 2.84V 2.96V 3.9V LK112SM31TR (1) 3.1V 3.04V 3.16V 4.1V LK112SM33TR 3.3V 3.24V 3.36V 4.3V LK112SM34TR (1) 3.4V 3.335V 3.465V 4.4V LK112SM35TR (1) 3.5V 3.435V 3.565V 4.5V LK112SM36TR (1) 3.6V 3.535V 3.655V 4.6V LK112SM37TR (1) 3.7V 3.630V 3.770V 4.7V LK112SM38TR (1) 3.8V 3.725V 3.875V 4.8V LK112SM39TR (1) 3.9V 3.825V 3.975V 4.9V LK112SM41TR (1) 4.1V 4.020V 4.180V 5.1V LK112SM42TR (1) 4.2V 4.120V 4.280V 5.2V LK112SM43TR (1) 4.3V 4.215V 4.385V 5.3V LK112SM44TR (1) 4.4V 4.315V 4.485V 5.4V LK112SM45TR (1) 4.5V 4.410V 4.590V 5.5V LK112SM46TR (1) 4.6V 4.510V 4.690V 5.6V LK112SM47TR (1) 4.7V 4.605V 4.795V 5.7V LK112SM48TR (1) 4.8V 4.705V 4.895V 5.8V LK112SM49TR (1) 4.9V 4.800V 5.000V 5.9V 5.0V 4.900V 5.100V 6.0V LK112SM50TR 1. Available on request. 15/17 Revision history LK112Sxx 8 Revision history Table 7. Document revision history Date Revision 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 TOP value on table 2 updated. 20-Jul-2007 7 Add Table 1 in cover page. 21-Sep-2007 8 Features updated. 11-Dec-2007 9 Modified: Table 6. 12-Feb-2008 10 Modified: Table 6 on page 15. 10-Jul-2008 11 Modified: Table 1 on page 1 and Table 6 on page 15. 16/17 Changes 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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