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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 A in OFF mode and max 250 A in ON mode at IOUT = 0 mA Low output noise: typ 30 V 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) capacitor can be used connected to the noise bypass pin to lower the output noise level to 30 Vrms. 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 Table 1. Device summary
Part numbers LK112SXX13 LK112SXX14 LK112SXX15 LK112SXX17 LK112SXX18 LK112SXX19 LK112SXX20 LK112SXX21 LK112SXX22 LK112SXX23 December 2007 LK112SXX24 LK112SXX26 LK112SXX27 LK112SXX28 LK112SXX29 LK112SXX31 LK112SXX32 LK112SXX33 LK112SXX34 LK112SXX35 Rev 9 LK112SXX36 LK112SXX37 LK112SXX38 LK112SXX39 LK112SXX40 LK112SXX41 LK112SXX42 LK112SXX43 LK112SXX44 LK112SXX45 1/18
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LK112SXX46 LK112SXX47 LK112SXX48 LK112SXX49 LK112SXX50 LK112SXX55 LK112SXX60 LK112SXX80
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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LK112Sxx
Diagram
1
Figure 1.
Diagram
Schematic diagram
3/18
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 F to improve the VREF thermal noise performances. Output port Input port
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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
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Electrical characteristics
LK112Sxx
4
Table 5.
Symbol Id VO VO VO
Electrical characteristics
Electrical characteristics for LK112S (TJ = 25 C, VIN=VOUT+1 V (1), IOUT = 0mA, VSHDN = 1.8 V, CI = 1F, CO = 2.2 F, CBYPASS = 0.1 F 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 = 0.1F CO = 10F, f = 400Hz, IO = 30mA B= 10Hz to 80kHz, CBYP = 0.1F CO = 10F, VI = VO+1.5V, IO = 60mA VSHDN = 1.8V, Output ON Output ON 1.8 V IO = 60 mA (2) IO = 200 mA
(2)
Min.
Typ. 175 0 (see table) 0.7 0.8 15 30 0.17 0.35
Max. 250 0.1
Unit A A
20 40 30 90 0.24 0.5
mV mV mV mV V V mA
Load regulation
Vd ISC SVR eN ISHDN VSHDN VO/TJ
200 55 30 12 35
dB Vrms A
1. For version with output voltage less than 2V VIN=2.4V 2. Only for version with output voltage more than 2.1V
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LK112Sxx
Typical characteristics
5
Figure 3.
Typical characteristics
(Unless otherwise specified, TJ = 25 C, CI = 1 F, CO = 2.2 F, 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
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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
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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
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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=2.5k, CI=1F, CO=4.7F, CBYP=10nF
VI=3.5V, VO=2.5V, VSHDN= 0 to 1.8V, RL=68, CI=1F, CO=4.7F, 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=100F, CBYP=10nF, ts=tf=2s
VI=3.5 to 4.5V, VO=2.5V, VSHDN= 1.8V, IO=30mA, no CI, CO=10F, CBYP=10nF, ts=tf=2s
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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=1F, CBYP=1nF, ts=tf=2s
VI=3.5V, VO=2.5V, VSHDN= 1.8V, IO=50 to 100mA, CI=1F, CO=2.2F, 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=1F, CO=10F, CBYP=100nF, ts=tf=250ns
VI=4.8V, VO=3.8V, VSHDN= 1.8V, IO=50 to 100mA, CI=1F, CO=2.2F, CBYP=10nF, ts=tf=250ns
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Package mechanical data
LK112Sxx
6
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) 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.
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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
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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.
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LK112Sxx
Order codes
7
Table 6.
Order codes
Order codes
Output voltage
(1)
Part number LK112SM13TR
VOUT Min 1.24V 1.34V 1.44V 1.64V 1.74V 1.84V 1.94V 2.04V 2.14V 2.24V 2.34V 2.54V 2.64V 2.74V 2.84V 3.04V 3.14V 3.24V 3.335V 3.435V 3.535V 3.630V 3.725V 3.825V 3.920V 4.020V 4.120V 4.215V 4.315V 4.410V 4.510V 4.605V 4.705V
VOUT Max 1.36V 1.46V 1.56V 1.76V 1.86V 1.96V 2.06V 2.16V 2.26V 2.36V 2.46V 2.66V 2.76V 2.86V 2.96V 3.16V 3.26V 3.36V 3.465V 3.565V 3.655V 3.770V 3.875V 3.975V 4.080V 4.180V 4.280V 4.385V 4.485V 4.590V 4.690V 4.795V 4.895V
Test voltage 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 3.0V 3.1V 3.2V 3.3V 3.4V 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 5.1V 5.2V 5.3V 5.4V 5.5V 5.6V 5.7V 5.8V
1.3V 1.4V 1.5V 1.7V 1.8V 1.9V 2.0V 2.1V 2.2V 2.3V 2.4V 2.6V 2.7V 2.8V 2.9V 3.1V 3.2V 3.3V 3.4V 3.5V 3.6V 3.7V 3.8V 3.9V 4.0V 4.1V 4.2V 4.3V 4.4V 4.5V 4.6V 4.7V 4.8V
LK112SM14TR (1) LK112SM15TR LK112SM17TR
(1) (1)
LK112SM18TR LK112SM19TR (1) LK112SM20TR LK112SM21TR LK112SM22TR
(1) (1) (1)
LK112SM23TR (1) LK112SM24TR LK112SM26TR LK112SM27TR
(1) (1) (1)
LK112SM28TR LK112SM29TR LK112SM31TR
(1) (1)
LK112SM32TR LK112SM33TR LK112SM34TR LK112SM35TR LK112SM36TR
(1) (1) (1)
LK112SM37TR (1) LK112SM38TR LK112SM39TR LK112SM40TR
(1) (1) (1)
LK112SM41TR (1) LK112SM42TR LK112SM43TR LK112SM44TR
(1) (1) (1)
LK112SM45TR (1) LK112SM46TR LK112SM47TR LK112SM48TR
(1) (1) (1)
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Order codes Table 6. Order codes (continued)
Output voltage
(1)
LK112Sxx
Part number LK112SM49TR
VOUT Min 4.800V 4.900V 5.390V 5.880V 7.840V
VOUT Max 5.000V 5.100V 5.610V 6.120V 8.160V
Test voltage 5.9V 6.0V 6.5V 7.0V 9.0V
4.9V 5.0V 5.5V 6.0V 8.0V
LK112SM50TR LK112SM55TR LK112SM60TR LK112SM80TR
(1) (1)
1. Available on request.
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LK112Sxx
Revision history
8
Table 7.
Date
Revision history
Document revision history
Revision 3 4 5 6 7 8 9 Mistake on Fig. 19. Change maturity code. Order codes updated and new template. The TOP value on table 2 has been updated. Add Table 1 in cover page. Features updated. Modified: Table 6. Changes
31-Aug-2004 31-Jan-2005 12-Jun-2006 17-Oct-2006 20-Jul-2007 21-Sep-2007 11-Dec-2007
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LK112Sxx
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