LK112 SERIES LOW NOISE LOW DROP VOLTAGE REGULATOR WITH SHUTDOWN FUNCTION ■ ■ ■ ■ ■ ■ OUTPUT CURRENT UP TO 150mA LOW DROPOUT VOLTAGE (350mV AT IOUT=150mA) VERY LOW QUIESCENT CURRENT: 0.1µA IN OFF MODE AND MAX 250µA IN ON MODE AT IOUT=0mA LOW OUTPUT NOISE: TYP 30µV AT IOUT=60mA AND 10Hz<f<80KHz WIDE RANGE OF OUTPUT VOLTGAES INTERNAL CURRENT AND THERMAL LIMIT DESCRIPTION The LK112 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 30µVrms. An internal PNP pass transistor is used to achieve a low dropout voltage. SOT23-5L The LK112 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 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. SCHEMATIC DIAGRAM June 2003 1/12 LK112 SERIES ABSOLUTE MAXIMUM RATINGS Symbol VI VSHDN IO Parameter² Value Unit DC Input Voltage 16 V Shutdown Input Voltage 16 V Output Current Internally limited Tstg Storage Temperature Range -55 to +150 °C Top Operating Junction Temperature Range -30 to +125 °C THERMAL DATA Symbol Parameter SOT23-5L Rthj-case Thermal Resistance Junction-case Rthj-amb Thermal Resistance Junction-ambient CONNECTION DIAGRAM (top view) 1 2 3 4 5 2/12 81 °C/W 255 °C/W PIN DESCRIPTION Pin N° Symbol SOT23-5L Unit SHDN Name and Function 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 0.1µF to improve the Vref thermal noise performances. OUT Output Port IN Input Port LK112 SERIES ELECTRICAL CHARACTERISTICS FOR LK112 (Tj = 25°C, VIN=VOUT+1V (see Note 1), IOUT=0mA, VSHDN=1.8V, CI = 1 µF, CO = 2.2µF, CBYPASS = 0.1µF unless otherwise specified) Symbol Id Parameter Test Conditions Quiescent Current ON MODE (except ISHDN) VSHDN = 0V Min. Typ. Max. Unit 175 250 µA 0 0.1 µA VO Output Voltage OFF MODE VI = 8V IO = 30mA ∆VO Line Regulation VI = VO+1V to VO+6V, VO ≤ 5.6V 0.7 20 mV VI = VO+1V to VO+6V, VO > 5.6V ∆VO Load Regulation Vd IO SVR Dropout Voltage (see table) 0.8 40 mV IO = 1 to 60mA 15 30 mV IO = 1 to 150mA 25 90 mV IO = 60 mA (see Note 2) 0.17 0.24 V IO = 150 mA (see Note 2) 0.29 0.35 V Output Current Limit 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 VSHDN Shutdown Input Logic Output ON Output OFF IO = 10mA eN ∆VO/Tj Output Voltage Temperature Coefficient Output ON 12 35 µA 0.6 V V mV/°C 1.8 0.09 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 3/12 LK112 SERIES ORDERING NUMBERS AND OUTPUT VOLTAGE Part Number LK112M13TR LK112M14TR (*) LK112M15TR LK112M16TR LK112M17TR LK112M18TR LK112M19TR (*) LK112M20TR (*) LK112M21TR LK112M22TR (*) LK112M23TR (*) LK112M24TR (*) LK112M25TR LK112M26TR (*) LK112M27TR (*) LK112M28TR LK112M29TR (*) LK112M30TR LK112M31TR (*) LK112M32TR LK112M33TR LK112M34TR (*) LK112M35TR (*) LK112M36TR LK112M37TR (*) LK112M38TR LK112M39TR (*) LK112M40TR LK112M41TR (*) LK112M42TR (*) LK112M43TR (*) LK112M44TR (*) LK112M45TR (*) LK112M46TR (*) LK112M47TR LK112M48TR (*) LK112M49TR (*) LK112M50TR LK112M55TR (*) LK112M60TR LK112M80TR (*) Available on request 4/12 Output Voltage VOUT Min VOUT Max Test 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 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 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 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 LK112 SERIES TYPICAL CHARACTERISTICS (unless otherwise specified Tj = 25°C, CI=1µF, CO=2.2µF, 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 5/12 LK112 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 6/12 LK112 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 7/12 LK112 SERIES Figure 19 : Stability Figure 22 : Start-up Transient VI=3.5V, V O=2.5V, VSHDN = 0 to 1.8V, RL=68Ω, CI=1µF, CO=4.7µF, 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=10µF, CBY=100nF, ts=tf=2µs Figure 21 : Start-up Transient Figure 24 : Line Transient VI=3.5V, V O=2.5V, V SHDN= 0 to 1.8V, RL=2.5KΩ, CI=1µF, CO=4.7µF, CBY=10nF VI=3.5 to 4.5V, V O=2.5V, V SHDN=1.8V, I O=30mA, No CI, CO=10µF, CBY=10nF, t s=tf=2µs 8/12 LK112 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=1µF, CBY=1nF, t s=tf=2µs VI=3.5V, V O=2.5V, V SHDN=1.8V, IO=50 to 100mA, CI1µF, CO=10µF, 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=1µF, CO=2.2µF, CBY=10nF, t s=tf=250ns VI=4.8 V, V O=3.8V, VSHDN=1.8V, IO=50 to 100mA, C I=1µF, CO=2.2µF, CBY=10nF, t s=tf=250ns 9/12 LK112 SERIES 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 . 7049676C 10/12 LK112 SERIES Tape & Reel SOT23-xL MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. 180 13.0 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 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 11/12 LK112 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. © The ST logo is a registered trademark of STMicroelectronics © 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. © http://www.st.com 12/12