LD2982 SERIES VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR WITH INHIBIT FUNCTION, LOW ESR CAP. COMPATIBLE ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ VERY LOW DROPOUT VOLTAGE (120mV AT 50mA AND 7mV AT 1mA LOAD) VERY LOW QUIESCENT CURRENT (375µA TYP. AT 50mA LOAD AND 75µA AT 1mA) OUTPUT CURRENT UP TO 50mA LOGIC CONTROLLED ELECTRONIC SHUTDOWN OUTPUT VOLTAGE OF 1.5,1.8, 2.5, 2.8, 2.85, 3, 3.1, 3.2, 3.3, 3.5, 3.6, 3.8, 4, 4.7, 5V INTERNAL CURRENT AND THERMAL LIMIT AVAILABLE IN ± 1% TOLLERANCE (AT 25°C, A VERSION) SUPPLY VOLTAGE REJECTION: 45dB (TYP) ONLY 1µF FOR STABILITY LOW OUTPUT NOISE VOLTAGE 30µVrms SMALLEST PACKAGE SOT23-5L TEMPERATURE RANGE: -40°C TO 125°C DESCRIPTION The LD2982 is a 50mA fixed output voltage regulator. The ultra low drop voltage and the low quiescent current make them particularly suitable for low noise, low power applications, and in battery powered systems. In sleep mode quiescent current is less than 1µA when INHIBIT SOT23-5L pin is pulled low. Shutdown Logic Control Function is available on pin 3 (TTL compatible). This means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. An external capacitor CBYP=10nF connected between bypass pin and GND reduce the noise to 30µVrms. Typical application are in cellular phone, palmtop/ laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera. SCHEMATIC DIAGRAM July 2003 1/13 LD2982 SERIES ABSOLUTE MAXIMUM RATINGS Symbol VI VINH Parameter Value Unit DC Input Voltage 16 V INHIBIT Input Voltage 16 V Output Current Internally limited Ptot Power Dissipation Internally limited Tstg Storage Temperature Range -65 to +150 °C Top Operating Junction Temperature Range -40 to +125 °C IO Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. THERMAL DATA Symbol Rthj-case Parameter Thermal Resistance Junction-case CONNECTION DIAGRAM (top view) SOT23-5L Unit 81 °C/W PIN DESCRIPTION Pin N° Symbol 1 2 3 4 SOT23-5L 5 Name and Function IN Input Port GND Ground Pin INHIBIT Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be left floating. Disable the device when connected to GND or to a positive voltage less than 0.18V Bypass Bypass Pin: Capacitor to be connected to GND in order to improve the thermal noise performances. OUT Output Port ORDERING CODES 2/13 A VERSION B VERSION OUTPUT VOLTAGES LD2982AM15R LD2982AM18R LD2982AM25R LD2982AM28R LD2982AM285R LD2982AM30R LD2982AM31R LD2982AM32R LD2982AM33R LD2982AM35R LD2982AM36R LD2982AM38R LD2982AM40R LD2982AM47R LD2982AM50R LD2982BM15R LD2982BM18R LD2982BM25R LD2982BM28R LD2982BM285R LD2982BM30R LD2982BM31R LD2982BM32R LD2982BM33R LD2982BM35R LD2982BM36R LD2982BM38R LD2982BM40R LD2982BM47R LD2982BM50R 1.5V 1.8V 2.5V 2.8V 2.85V 3.0V 3.1V 3.2V 3.3V 3.5V 3.6V 3.8V 4.0V 4.7V 5.0V LD2982 SERIES ELECTRICAL CHARACTERISTICS FOR LD2982A (TJ = 25°C, VI=VO+1V, IO=1mA, VSHDN=2V, CI = 1µF, CO = 1µF, unless otherwise specified) Symbol Parameter VOp Operating Input Voltage VO Output Voltage Test Conditions IO = 1 to 50mA Output Voltage 1.485 TJ= -40 to 125°C VI = 2.8V IO = 1 to 50mA Output Voltage TJ= -40 to 125°C VI = 3.5V IO = 1 to 50mA Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage V 2.462 2.537 V 2.45 2.55 V VI = 3.85V 2.821 IO = 1 to 50mA 2.807 TJ= -40 to 125°C 2.8 2.85 2.793 V V 2.907 V 3.030 V 2.970 IO = 1 to 50mA 2.955 3.045 V 2.94 3.06 V 3.131 V TJ= -40 to 125°C VI = 4.1V 3.069 TJ= -40 to 125°C 3.0 2.879 2.893 VI = 4.0V 3.1 3.053 3.146 V 3.038 3.162 V VI = 4.2V 3.168 3.232 V IO = 1 to 50mA 3.152 3.248 V 3.136 3.264 V TJ= -40 to 125°C VI = 4.3V 3.267 IO = 1 to 50mA 3.250 TJ= -40 to 125°C 3.465 IO = 1 to 50mA 3.447 TJ= -40 to 125°C VI = 4.6V TJ= -40 to 125°C 3.5 3.6 3.333 V 3.349 V 3.366 V 3.535 V 3.552 V 3.57 V 3.636 V 3.546 3.654 V 3.528 3.672 V 3.838 V 3.762 TJ= -40 to 125°C 3.3 3.43 3.564 VI = 4.8V 3.2 3.234 VI = 4.5V IO = 1 to 50mA Output Voltage 2.525 2.5 V IO = 1 to 50mA VO V V 2.856 IO = 1 to 50mA Output Voltage 1.827 1.836 2.744 TJ= -40 to 125°C IO = 1 to 50mA VO 1.773 1.764 V IO = 1 to 50mA VO V V IO = 1 to 50mA VO 1.818 1.8 2.828 IO = 1 to 50mA VO V V 2.842 IO = 1 to 50mA Output Voltage 1.523 1.530 2.772 IO = 1 to 50mA VO V 2.758 IO = 1 to 50mA VO V 1.515 VI = 3.8V IO = 1 to 50mA VO 16 1.5 IO = 1 to 50mA IO = 1 to 50mA VO TJ= -40 to 125°C Unit 1.477 2.475 IO = 1 to 50mA VO Max. 1.470 1.782 IO = 1 to 50mA VO Typ. 2.5 VI = 2.5V IO = 1 to 50mA VO Min. 3.8 3.743 3.857 V 3.724 3.876 V VI = 5.0V 3.96 4.04 V IO = 1 to 50mA 3.94 4.06 V 3.92 4.08 V IO = 1 to 50mA TJ= -40 to 125°C 4 3/13 LD2982 SERIES Symbol VO Parameter Output Voltage Test Conditions Min. Typ. Max. VI = 5.7V 4.653 4.7 4.747 V IO = 1 to 50mA 4.629 4.77 V 4.794 V 5.05 V IO = 1 to 50mA VO Output Voltage Short Circuit Current ∆VO/∆VI Line Regulation 4.606 VI = 6.0V 4.95 IO = 1 to 50mA 4.925 5.075 V 4.9 5.1 V IO = 1 to 50mA ISC TJ= -40 to 125°C TJ= -40 to 125°C RL = 0 5 150 VI = VO+1V to 16V, IO = 1mA 0.003 VI = VO+1V to 16V, IO = 1mA TJ= -40 to 125°C Vd Dropout Voltage IO = 0 IO = 0 1 TJ= -40 to 125°C IO = 1mA IO = 1mA 7 TJ= -40 to 125°C IO = 10mA IO = 10mA 40 TJ= -40 to 125°C IO = 50mA IO = 50mA Id Quiescent Current 120 TJ= -40 to 125°C IO = 0 IO = 0 80 TJ= -40 to 125°C IO = 1mA IO = 1mA 100 TJ= -40 to 125°C IO = 10mA IO = 10mA 200 TJ= -40 to 125°C IO = 50mA IO = 50mA 600 TJ= -40 to 125°C OFF MODE VINH<0.18V Supply Voltage Rejection CBYP = 0.01µF CO = 10µF mA 0.014 %/VI 0.032 %/VI 3 mV 5 mV 10 mV 15 mV 60 mV 90 mV 150 mV 225 mV 100 µA 150 µA 150 µA 200 µA 300 µA 400 µA 900 µA 1200 µA 1 µA µA 0 OFF MODE VINH<0.18V TJ= -40 to 125°C SVR Unit f = 1KHz 45 dB VIL Control Input Logic Low TJ= -40 to 125°C VIH Control Input Logic High TJ= -40 to 125°C IiNH Control Input Current TJ= -40 to 125°C VSHDN = 5V 5 15 µA TJ= -40 to 125°C VSHDN = 0V 0 -1 µA eN 4/13 Output Noise Voltage 0.15 2 B= 300Hz to 50KHz CO = 10µF CBYP = 0.01µF V V 30 µV LD2982 SERIES ELECTRICAL CHARACTERISTICS FOR LD2982B (TJ = 25°C, VI=VO+1V, IO=1mA, VSHDN=2V, CI = 1µF, CO = 1µF, unless otherwise specified) Symbol Parameter VOp Operating Input Voltage VO Output Voltage Test Conditions IO = 1 to 50mA Output Voltage 1.477 TJ= -40 to 125°C VI = 2.8V IO = 1 to 50mA Output Voltage TJ= -40 to 125°C VI = 3.5V IO = 1 to 50mA Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage 2.45 2.55 V 2.412 2.587 V VI = 3.85V 2.807 2.793 TJ= -40 to 125°C VI = 4.0V TJ= -40 to 125°C 2.85 3.0 2.893 V 2.907 V 2.950 V 3.045 V 2.94 3.06 V 2.895 3.105 V 3.146 V 3.053 TJ= -40 to 125°C 2.8 2.750 2.955 VI = 4.1V 3.1 3.038 3.162 V 2.991 3.208 V VI = 4.2V 3.152 3.248 V IO = 1 to 50mA 3.136 3.264 V 3.088 3.312 V TJ= -40 to 125°C VI = 4.3V 3.250 IO = 1 to 50mA 3.234 TJ= -40 to 125°C 3.447 IO = 1 to 50mA 3.430 TJ= -40 to 125°C VI = 4.6V TJ= -40 to 125°C 3.5 3.6 3.349 V 3.366 V 3.415 V 3.552 V 3.370 V 3.662 V 3.654 V 3.528 3.672 V 3.474 3.726 V 3.857 V 3.743 TJ= -40 to 125°C 3.3 3.377 3.546 VI = 4.8V 3.2 3.184 VI = 4.5V IO = 1 to 50mA Output Voltage V IO = 1 to 50mA IO = 1 to 50mA VO 2.537 2.5 V IO = 1 to 50mA Output Voltage V V 2.898 TJ= -40 to 125°C IO = 1 to 50mA VO 1.836 1.863 2.702 IO = 1 to 50mA VO 1.764 1.737 V IO = 1 to 50mA VO V V IO = 1 to 50mA VO 1.827 1.8 2.842 IO = 1 to 50mA Output Voltage V V 2.856 IO = 1 to 50mA VO 1.530 1.553 2.758 IO = 1 to 50mA Output Voltage V 2.744 IO = 1 to 50mA VO V 1.523 VI = 3.8V IO = 1 to 50mA VO 16 1.5 IO = 1 to 50mA IO = 1 to 50mA VO TJ= -40 to 125°C Unit 1.470 2.462 IO = 1 to 50mA VO Max. 1.447 1.773 IO = 1 to 50mA VO Typ. 2.5 VI = 2.5V IO = 1 to 50mA VO Min. 3.8 3.724 3.876 V 3.667 3.933 V VI = 5.0V 3.94 4.06 V IO = 1 to 50mA 3.92 4.08 V 3.86 4.14 V IO = 1 to 50mA TJ= -40 to 125°C 4 5/13 LD2982 SERIES Symbol VO Parameter Output Voltage Test Conditions Min. Typ. VI = 5.7V 4.629 4.7 IO = 1 to 50mA 4.606 IO = 1 to 50mA VO Output Voltage TJ= -40 to 125°C VI = 6.0V 4.925 IO = 1 to 50mA IO = 1 to 50mA ISC Short Circuit Current ∆VO/∆VI Line Regulation 4.535 TJ= -40 to 125°C 5 Dropout Voltage 400 0.003 1 TJ= -40 to 125°C 7 TJ= -40 to 125°C 40 TJ= -40 to 125°C IO = 50mA Quiescent Current 120 TJ= -40 to 125°C IO = 0 IO = 0 80 TJ= -40 to 125°C IO = 1mA IO = 1mA 100 TJ= -40 to 125°C IO = 10mA IO = 10mA 200 TJ= -40 to 125°C IO = 50mA IO = 50mA 600 TJ= -40 to 125°C OFF MODE VINH<0.18V Supply Voltage Rejection CBYP = 0.01µF CO = 10µF mA 0.014 %/VI 0.032 %/VI 3 mV 5 mV 10 mV 15 mV 60 mV 90 mV 150 mV 225 mV 100 µA 150 µA 150 µA 200 µA 300 µA 400 µA 900 µA 1200 µA 1 µA µA 0 OFF MODE VINH<0.18V TJ= -40 to 125°C SVR V V IO = 10mA Id V 5.075 V IO = 1mA IO = 50mA 4.864 5.1 IO = 0 IO = 10mA V V 5.175 VI = VO+1V to 16V, IO = 1mA IO = 1mA 4.77 4.794 4.9 RL = 0 IO = 0 Unit 4.825 VI = VO+1V to 16V, IO = 1mA TJ= -40 to 125°C Vd Max. f = 1KHz 45 dB VIL Control Input Logic Low TJ= -40 to 125°C VIH Control Input Logic High TJ= -40 to 125°C IiNH Control Input Current TJ= -40 to 125°C VSHDN = 5V 5 15 µA TJ= -40 to 125°C VSHDN = 0V 0 -1 µA eN 6/13 Output Noise Voltage 0.15 2 B= 300Hz to 50KHz CO = 10µF CBYP = 0.01µF V V 30 µV LD2982 SERIES TYPICAL CHARACTERISTICS (unless otherwise specified TJ = 25°C, CI=1µF, CO=2.2µF, CBYP=100nF) Figure 1 : Output Voltage vs Temperature Figure 4 : Quiescent Current vs Load Current Figure 2 : Dropout Voltage vs Temperature Figure 5 : Quiescent Current vs Temperature Figure 3 : Dropout Voltage vs Output Current Figure 6 : Supply Voltage Rejection vs Temperature 7/13 LD2982 SERIES Figure 7 : Supply Voltage Rejection vs Output Current Figure 10 : Supply Voltage Rejection vs Frequency Figure 8 : Supply Voltage Rejection vs Output Current Figure 11 : Line Transient VO=2.5V, IO= 50mA, no CI, CO=4.7µF, tr=tf=2ns Figure 9 : Supply Voltage Rejection vs Frequency Figure 12 : Line Transient VO=2.5V, IO= 50mA, no CI, CO=4.7µF, tr=tf=1µs 8/13 LD2982 SERIES Figure 13 : Load Transient Figure 14 : Load Transient VO=2.5V, IO=0 to 50mA, no CI, CO=10µF, ts=tf=2ns VO=2.5V, IO=0 to 50mA, no CI, CO=4.7µF, ts=tf=2ns EXTERNAL CAPACITORS Like any low-dropout regulator, the LD2982 requires external capacitors for regulator stability. This capacitor must be selected to meet the requirements of minimum capacitance and equivalent series resistance. We suggest to solder input and output capacitors as close as possible to the relative pins. INPUT CAPACITOR An input capacitor whose value is 1µF is required with the LD2982 (amount of capacitance can be increased without limit). This capacitor must be located a distance of not more than 0.5" from the input pin of the device and returned to a clean analog ground. Any good quality ceramic, tantalum or film capacitors can be used for this capacitor. OUTPUT CAPACITOR The LD2982 is designed specifically to work with ceramic output capacitors. It may also be possible to use Tantalum capacitors, but these are not as attractive for reasons of size and cost. By the way, the output capacitor must meet both the requirement for minimum amount of capacitance and E.S.R. (equivalent series resistance) value. Due to the different loop gain, the stability improves for higher output versions and so the suggested minimum output capacitor value, if low E.S.R. ceramic type is used, is 1µF for output voltages equal or major than 3.8V, 2.2µF for VO going from 1.8 to 3.3V, and 3.3µF for the other versions. However, if an output capacitor lower than the suggested one is used, it's possible to make stable the regulator adding a resistor in series to the capacitor. IMPORTANT: The output capacitor must maintain its ESR in the stable region over the full operating temperature to assure stability. Also, capacitor tolerance and variation with temperature must be considered to assure the minimum amount of capacitance is provided at all times. This capacitor should be located not more than 0.5" from the output pin of the device and returned to a clean analog ground. INHIBIT INPUT OPERATION The inhibit pin can be used to turn OFF the regulator when pulled low, so drastically reducing the current consumption down to less than 1µA. When the inhibit feature is not used, this pin must be tied to VI to keep the regulator output ON at all times. To assure proper operation, the signal source used to drive the inhibit pin must be able to swing above and below the specified thresholds listed in the electrical characteristics section under VIH VIL. Any slew rate can be used to drive the inhibit. 9/13 LD2982 SERIES REVERSE CURRENT The power transistor used in the LD2982 has not an inherent diode connected between the regulator input and output. If the output is forced above the input, no current will flow from the output to the input across the series pass transistor. When a VREV voltage is applied on the output, the reverse current measured flows to the GND across the two feedback resistors. This current typical value is 160µA. R1 and R2 resistors are implanted type; typical values are, respectively, 42.6 KΩ and 51.150 KΩ. Figure 15 : Reverse Current Test Circuit 10/13 LD2982 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 11/13 LD2982 SERIES 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 12/13 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 LD2982 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 13/13