LK112xx Low noise low drop voltage regulator with shutdown function Features ■ Output current up to 150 mA ■ Low dropout voltage (350 mV at IOUT = 50 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 ■ 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) SOT23-5L Description The LK112xx 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 µVrms. An internal PNP pass transistor is used to achieve a low dropout voltage. Table 1. The LK112xx 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 LK112XX14 LK112XX24 LK112XX35 LK112XX45 LK112XX15 LK112XX25 LK112XX37 LK112XX46 LK112XX18 LK112XX26 LK112XX39 LK112XX48 LK112XX19 LK112XX29 LK112XX41 LK112XX49 LK112XX20 LK112XX31 LK112XX42 LK112XX50 LK112XX22 LK112XX33 LK112XX43 LK112XX60 LK112XX23 LK112XX34 LK112XX44 LK112XX80 July 2008 Rev 15 1/17 www.st.com 17 Contents LK112xx 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 LK112xx Diagram 1 Diagram Figure 1. Schematic diagram 3/17 Pin configuration LK112xx 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 LK112xx 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 LK112xx 4 Electrical characteristics Table 5. Electrical characteristics for LK112 (TJ = 25 °C, VIN = VOUT + 1 V (1), IOUT = 0 mA, VSHDN = 1.8 V, CI = 1 µF, CO = 2.2 µF, CBYPASS = 0.1 µF unless otherwise specified) Symbol Parameter Iq 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 IO Output current limit 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 150mA 25 90 mV 0.17 0.24 V 0.29 0.35 V IO = 60 mA (2) IO = 150 mA (2) 150 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 2 V, VIN = 2.4 V 2. Only for version with output voltage more than 2.1 V 6/17 35 0.6 0.09 mV/°C LK112xx 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 LK112xx 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 LK112xx 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 output current Figure 20. Reverse current vs reverse voltage 9/17 Typical characteristics LK112xx 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 LK112xx 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 LK112xx 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 LK112xx 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 LK112xx 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 LK112xx Order codes 7 Order codes Table 6. Order codes Part number Output voltage VOUT Min VOUT Max Test voltage LK112M14TR (1) 1.4V 1.34V 1.46V 2.4V LK112M15TR 1.5V 1.44V 1.56V 2.4V LK112M18TR 1.8V 1.74V 1.86V 2.4V LK112M19TR (1) 1.9V 1.84V 1.96V 2.4V LK112M20TR (1) 2.0V 1.94V 2.06V 3.0V LK112M22TR (1) 2.2V 2.14V 2.26V 3.2V LK112M23TR (1) 2.3V 2.24V 2.36V 3.3V (1) 2.4V 2.34V 2.46V 3.4V LK112M24TR LK112M25TR 2.5V 2.44V 2.56V 3.5V (1) 2.6V 2.54V 2.66V 3.6V LK112M29TR (1) 2.9V 2.84V 2.96V 3.9V (1) 3.1V 3.04V 3.16V 4.1V LK112M26TR LK112M31TR LK112M33TR 3.3V 3.24V 3.36V 4.3V (1) 3.4V 3.335V 3.465V 4.4V LK112M35TR (1) 3.5V 3.435V 3.565V 4.5V LK112M37TR (1) 3.7V 3.630V 3.770V 4.7V LK112M39TR (1) 3.9V 3.825V 3.975V 4.9V LK112M41TR (1) 4.1V 4.020V 4.180V 5.1V LK112M42TR (1) 4.2V 4.120V 4.280V 5.2V LK112M43TR (1) 4.3V 4.215V 4.385V 5.3V LK112M44TR (1) 4.4V 4.315V 4.485V 5.4V LK112M45TR (1) 4.5V 4.410V 4.590V 5.5V LK112M46TR (1) 4.6V 4.510V 4.690V 5.6V LK112M48TR (1) 4.8V 4.705V 4.895V 5.8V LK112M49TR (1) 4.9V 4.800V 5.000V 5.9V LK112M50TR 5.0V 4.900V 5.100V 6.0V LK112M60TR 6.0V 5.880V 6.120V 7.0V LK112M80TR 8.0V 7.840V 8.160V 9.0V LK112M34TR 1. Available on request. 15/17 Revision history LK112xx 8 Revision history Table 7. Document revision history Date Revision 31-Jan-2005 8 Change maturity code. 13-Jun-2006 9 Order codes updated and new template. 17-Oct-2006 10 The TOP value on table 2 has been updated. 18-Jul-2007 11 Add Table 1 in cover page. 21-Sep-2007 12 Features updated. 11-Dec-2007 13 Modified: Table 6. 12-Feb-2008 14 Modified: Table 6 on page 15. 10-Jul-2008 15 Modified: Table 1 on page 1 and Table 6 on page 15. 16/17 Changes LK112xx 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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