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| LK112S SERIES LOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION s s s s s s s OUTPUT CURRENT UP TO 200mA LOW DROPOUT VOLTAGE (500mV MAX AT IOUT=200mA) VERY LOW QUIESCENT CURRENT: 0.1A IN OFF MODE AND MAX 250A IN ON MODE AT IOUT=0mA LOW OUTPUT NOISE: TYP 30V AT IOUT=60mA AND 10Hz DESCRIPTION The LK112S 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 30Vrms. An internal PNP pass transistor is used to achieve a low dropout voltage. The LK112S has a very low quiescent current in ON MODE while in OFF MODE the Iq is reduced down to 100nA max. The internal thermal shutdown circuitry limits the juntion temperature to below 150C. The load current is internally monitored and the device will shutdown in the presence of a short circuit or overcurrent condition at the output. SCHEMATIC DIAGRAM February 2003 1/11 LK112S SERIES ABSOLUTE MAXIMUM RATINGS Symbol VI VSHDN IO Tstg Top DC Input Voltage Shutdown Input Voltage Output Current Storage Temperature Range Operating Junction Temperature Range Parameter Value 16 16 Internally limited -55 to +150 -30 to +80 C C Unit V V CONNECTION DIAGRAM (top view) PIN DESCRIPTION Pin N Symbol 1 SHDN Name and Function 2 SOT23-5L 3 4 5 Shutdown Input: Disables the regulator when is connected to GND or to positive voltage less than 0.6V GND Ground Pin: Internally connected to the die attach flag to decrease the total thermal resistance and increase the package ability to dissipate power. Bypass Bypass Pin: Bypass with 0.1F to improve the Vref thermal noise performances. OUT Output Port IN Input Port ELECTRICAL CHARACTERISTICS FOR LK112 (Tj = 25C, VIN=VOUT+1V (see Note 1), IOUT=0mA, VSHDN=1.8V, CI = 1 F, CO = 2.2F, CBYPASS = 0.1F unless otherwise specified) Symbol Id VO VO VO Vd ISC SVR eN ISHDN VSHDN VO/Tj Parameter Quiescent Current Output Voltage Line Regulation Load Regulation Dropout Voltage Short Circuit Current Supply Voltage Rejection Output Noise Voltage Shutdown Input Current Shutdown Input Logic Output Voltage Temperature Coefficient CBYP = 0.1F VI = VO+1.5V 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 OFF IO = 10mA Output ON 1.8 0.6 0.09 Test Conditions ON MODE (except ISHDN) VSHDN = 0V OFF MODE VI = 8V IO = 30mA VI = VO+1V to VO+6V, VI = VO+1V to VO+6V, IO = 1 to 60mA IO = 1 to 200mA IO = 60 mA (see Note 2) IO = 200 mA (see Note 2) 200 55 30 12 35 VO 5.6V VO > 5.6V Min. Typ. 175 0 (see table) 0.7 0.8 15 30 0.17 0.35 20 40 30 90 0.24 0.5 mV mV mV mV V V mA dB Vrms A V V mV/C Max. 250 0.1 Unit A A Note 1: for version with output voltage less than 2V VIN=2.4V Note 2: only for version with output voltage more than 2.1V 2/11 LK112S SERIES ORDERING NUMBERS AND OUTPUT VOLTAGE Part Number LK112SM13TR LK112SM14TR (*) LK112SM15TR LK112SM16TR LK112SM17TR (*) LK112SM18TR LK112SM19TR (*) LK112SM20TR (*) LK112SM21TR LK112SM22TR (*) LK112SM23TR (*) LK112SM24TR (*) LK112SM25TR LK112SM26TR (*) LK112SM27TR (*) LK112SM28TR LK112SM29TR (*) LK112SM30TR LK112SM31TR (*) LK112SM32TR LK112SM33TR LK112SM34TR (*) LK112SM35TR (*) LK112SM36TR LK112SM37TR (*) LK112SM38TR LK112SM39TR (*) LK112SM40TR LK112SM41TR (*) LK112SM42TR (*) LK112SM43TR (*) LK112SM44TR (*) LK112SM45TR (*) LK112SM46TR (*) LK112SM47TR LK112SM48TR (*) LK112SM49TR (*) LK112SM50TR LK112SM55TR (*) LK112M60TR LK112SM80TR (*) Available on request Output Voltage 1.3V 1.4V 1.5V 1.6V 1.7V 1.8V 1.9V 2.0V 2.1V 2.2V 2.3V 2.4V 2.5V 2.6V 2.7V 2.8V 2.9V 3.0V 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 4.9V 5.0V 5.5V 6.0V 8.0V VOUT Min 1.24V 1.34V 1.44V 1.54V 1.64V 1.74V 1.84V 1.94V 2.04V 2.14V 2.24V 2.34V 2.44V 2.54V 2.64V 2.74V 2.84V 2.94V 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 4.800V 4.900V 5.390V 5.880V 7.840V VOUT Max 1.36V 1.46V 1.56V 1.66V 1.76V 1.86V 1.96V 2.06V 2.16V 2.26V 2.36V 2.46V 2.56V 2.66V 2.76V 2.86V 2.96V 3.06V 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 5.000V 5.100V 5.610V 6.120V 8.160V Test Voltage 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 2.4V 3.0V 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 4.9V 5.0V 5.1V 5.2V 5.3V 5.4V 5.5V 5.6V 5.7V 5.8V 5.9V 6.0V 6.5V 7.0V 9.0V 3/11 LK112S SERIES TYPICAL CHARACTERISTICS (unless otherwise specified Tj = 25C, CI=1F, CO=2.2F, CBYP=100nF) Figure 1 : Output Voltage vs Temperature Figure 4 : Load Regulation vs Temperature Figure 2 : Output Voltage vs Temperature Figure 5 : Dropout Voltage vs Temperature Figure 3 : Line Regulation vs Temperature Figure 6 : Short Circuit Currennt vs Dropout Voltage 4/11 LK112S SERIES Figure 7 : Output Voltage vs Input Voltage Figure 10 : Supply Voltage Rejection vs Temperature Figure 8 : Shutdown Voltage vs Temperature Figure 11 : Supply Voltage Rejection vs Output Current Figure 9 : Shutdown Current vs Shutdown Voltage Figure 12 : Supply Voltage Rejection vs Frequency 5/11 LK112S SERIES Figure 13 : Supply Voltage Rejection vs Temperature Figure 16 : Quiescent Current vs Shutdown Voltage Figure 14 : Quiescent Current vs Temperature Figure 17 : Quiescent Current vs Output Current Figure 15 : Quiescent Current vs Input Voltage Figure 18 : Reverse Current vs Reverse Voltage 6/11 LK112S SERIES Figure 19 : Stability Figure 22 : Start-up Transient VI=3.5V, V O=2.5V, VSHDN = 0 to 1.8V, RL=68, CI=1F, CO=4.7F, CBY=100nF Figure 20 : Spectrum Noise Figure 23 : Line Transient VI=3.5 to 4.5V, V O=2.5V, V SHDN=1.8V, I O=30mA, No CI, CO=10F, CBY=100nF, ts=tf=2s Figure 21 : Start-up Transient Figure 24 : Line Transient VI=3.5V, V O=2.5V, V SHDN= 0 to 1.8V, RL=2.5K, CI=1F, CO=4.7F, CBY=10nF VI=3.5 to 4.5V, V O=2.5V, V SHDN=1.8V, I O=30mA, No CI, CO=10F, CBY=10nF, t s=tf=2s 7/11 LK112S SERIES Figure 25 : Line Transient Figure 27 : Load Transient VI=3.5 to 4.5V, V O=2.5V, VSHDN =1.8V, IO=30mA, No CI, CO=1F, CBY=1nF, t s=tf=2s VI=3.5V, V O=2.5V, V SHDN=1.8V, IO=50 to 100mA, CI1F, CO=10F, CBY =100nF, ts=tf=250ns Figure 26 : Load Transient Figure 28 : Load Transient VI=3.5 V, V O=2.5V, VSHDN=1.8V, IO=50 to 100mA, C I=1F, CO=2.2F, CBY=10nF, t s=tf=250ns VI=4.8 V, V O=3.8V, VSHDN=1.8V, IO=50 to 100mA, C I=1F, CO=2.2F, CBY=10nF, t s=tf=250ns 8/11 LK112S SERIES SOT23-5L MECHANICAL DATA mm. DIM. MIN. A A1 A2 b C D E E1 e e1 L 0.35 0.90 0.00 0.90 0.35 0.09 2.80 2.60 1.50 0 .95 1.9 0.55 13.7 TYP MAX. 1.45 0.15 1.30 0.50 0.20 3.00 3.00 1.75 MIN. 35.4 0.0 35.4 13.7 3.5 110.2 102.3 59.0 37.4 74.8 21.6 TYP. MAX. 57.1 5.9 51.2 19.7 7.8 118.1 118.1 68.8 mils 9/11 LK112S SERIES 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 10/11 LK112S SERIES Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2003 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. (c) http://www.st.com 11/11 |
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