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LD2981 SERIES
ULTRA LOW DROP VOLTAGE REGULATORS WITH INHIBIT LOW ESR OUTPUT CAPACITORS COMPATIBLE
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STABLE WITH LOW ESR CERAMIC CAPACITORS ULTRA LOW DROPOUT VOLTAGE (0.17V TYP. AT 100mA LOAD, 7mV TYP. AT 1mA LOAD) VERY LOW QUIESCENT CURRENT (80A TYP. AT NO LOAD IN ON MODE; MAX 1A IN OFF MODE) GUARANTEED OUTPUT CURRENT UP TO 100mA LOGIC-CONTROLLED ELECTRONIC SHUTDOWN OUTPUT VOLTAGE OF 1.5; 1.8; 2.5; 2.85; 3.0; 3.2; 3.3; 3.6; 3.8; 4.0; 4.7; 4.85; 5.0V INTERNAL CURRENT AND THERMAL LIMIT 0.75% TOLERANCE OUTPUT VOLTAGE AVAILABLE (A VERSION) OUTPUT LOW NOISE VOLTAGE 160VRMS TEMPERATURE RANGE: -40 TO 125C SMALLEST PACKAGE SOT23-5L AND SOT-89 FAST DYNAMIC RESPONSE TO LINE AND LOAD CHANGES
SOT23-5L
SOT-89
DESCRIPTION The LD2981 series are 100mA fixed-output voltage regulator. The low drop-voltage and the SCHEMATIC DIAGRAM
ultra low quiescent current make them suitable for low noise, low power applications and in battery powered systems. The quiescent current in sleep mode is less than 1A when INHIBIT pin is pulled low. Shutdown Logic Control function is available on pin n.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. The LD2981 is designed to work with low ESR ceramic capacitor. Typical applications are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.
September 2003
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ABSOLUTE MAXIMUM RATINGS
Symbol VI VINH IO PD TSTG TOP DC Input Voltage INHIBIT Input Voltage Output Current Power Dissipation Storage Temperature Range Operating Junction Temperature Range Parameter Value -0.3 to 16 -0.3 to 16 Internally limited Internally limited -55 to 150 -40 to 125 C C Unit V V
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-amb Parameter Thermal Resistance Junction-ambient SOT23-5L 81 255 SOT-89 15 110 Unit C/W C/W
Rthj-case Thermal Resistance Junction-case
CONNECTION DIAGRAM (top view)
SOT23-5L
SOT-89
PIN DESCRIPTION
Pin N SOT23-5L 1 2 3 Pin N SOT-89 3 2 Symbol VIN GND INHIBIT Input Port Ground Pin 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 Not Connected Output Port Name and Function
4 5
1
NC VOUT
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ORDERING CODES
AB VERSION SOT23-5L SOT-89 SOT23-5L LD2981CM15TR LD2981CM18TR LD2981CM25TR LD2981CM28TR LD2981CM30TR LD2981CM32TR LD2981CM33TR LD2981CM36TR LD2981CM38TR LD2981CM40TR LD2981CM47TR LD2981CM48TR LD2981CM50TR C VERSION SOT-89 LD2981CU15TR LD2981CU18TR LD2981CU25TR LD2981CU28TR LD2981CU30TR LD2981CU32TR LD2981CU33TR LD2981CU36TR LD2981CU38TR LD2981CU40TR LD2981CU47TR LD2981CU48TR LD2981CU50TR OUTPUT VOLTAGES 1.5 V 1.8 V 2.5 V 2.85 V 3.0 V 3.2 V 3.3 V 3.6 V 3.8 V 4.0 V 4.7 V 4.85 V 5.0 V
LD2981ABM25TR LD2981ABM28TR LD2981ABM30TR LD2981ABM32TR LD2981ABM33TR LD2981ABM36TR LD2981ABM38TR LD2981ABM40TR LD2981ABM47TR LD2981ABM48TR LD2981ABM50TR
LD2981ABU25TR LD2981ABU28TR LD2981ABU30TR LD2981ABU32TR LD2981ABU33TR LD2981ABU36TR LD2981ABU38TR LD2981ABU40TR LD2981ABU47TR LD2981ABU48TR LD2981ABU50TR
TYPICAL APPLICATION CIRCUIT
(*) Inhibit Pin is not internally pulled-up then it must not be left floating. Disable the device when connected to GND or to a positive voltage less than 0.18V.
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ELECTRICAL CHARACTERISTICS FOR LD2981AB (Tj = 25C, VI = VO(NOM) +1V, C I = 1F(X7R), CO = 2.2F(X7R), IO = 1mA, VINH = 2V, unless otherwise specified)
Symbol VOP VO Parameter Operating Input Voltage Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Line Regulation TJ= -40 to 125C VO(NOM) + 1 < VIN < 16 V IO = 1 mA TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C Test Conditions Min. 2.5 2.481 2.475 2.437 2.828 2.822 2.779 2.977 2.970 2.925 3.176 3.168 3.12 3.275 3.267 3.217 3.573 3.564 3.510 3.771 3.762 3.705 3.97 3.96 3.9 4.664 4.653 4.582 4.813 4.801 4.729 4.962 4.950 4.875 0.003 5 4.85 4.7 4 3.8 3.6 3.3 3.2 3 2.85 2.5 Typ. Max. 16 2.518 2.525 2.562 2.872 2.878 2.921 3.023 3.030 3.075 3.224 3.232 3.28 3.325 3.333 3.383 3.627 3.636 3.690 3.829 3.838 3.895 4.03 4.04 4.1 4.735 4.747 4.817 4.887 4.899 4.971 5.038 5.050 5.125 0.014 0.032 %/V V V V V V V V V V V Unit V V
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LD2981 SERIES
Symbol IQ
Parameter Quiescent Current ON MODE IO = 0 IO = 0 IO = 1 mA IO = 1 mA IO = 25 mA IO = 25 mA IO = 100 mA IO = 100 mA OFF MODE
Test Conditions
Min.
Typ. 80
Max. 100 150 150 200 400 800 1300 2600 0.8 2
Unit A
TJ= -40 to 125C 100 TJ= -40 to 125C 250 TJ= -40 to 125C 1000 TJ= -40 to 125C TJ= -40 to 125C 1 TJ= -40 to 125C 7 TJ= -40 to 125C 70 TJ= -40 to 125C 180 TJ= -40 to 125C 150 f = 1KHz TJ= -40 to 125C TJ= -40 to 125C 1.6 0 5 160 170 63
VINH < 0.3 V VINH < 0.15 V IO = 0 IO = 0 IO = 1mA IO = 1mA IO = 25mA IO = 25mA IO = 100mA IO = 100mA
VDROP
Dropout Voltage (NOTE 1)
3 5 10 15 100 150 250 375
mV
ISC SVR VINH VINL IINH eN TSHDN
Short Circuit Current Supply Voltage Rejection Inhibit Input Logic Low Inhibit Input Logic High Inhibit Input Current
RL = 0 CO = 10F LOW = Output OFF HIGH = Output ON VINH = 0V VINH = 5V
mA dB 0.18 V V -1 15 VRMS C A
TJ= -40 to 125C TJ= -40 to 125C CO = 10 F
Output Noise Voltage Thermal Shutdown
BW = 300 Hz to 50 KHz
(NOTE 1): For Vo < 2.5V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
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LD2981 SERIES
ELECTRICAL CHARACTERISTICS FOR LD2981C (Tj = 25C, VI = VO(NOM) +1V, C I = 1F(X7R), CO = 2.2F(X7R), IO = 1mA, VINH = 2V, unless otherwise specified)
Symbol VOP VO Parameter Operating Input Voltage Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA VO Output Voltage IO = 1 mA IO = 1 to 100 mA IO = 1 to 100 mA TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C Test Conditions Min. 2.5 1.478 1.470 1.445 1.777 1.764 1.737 2.468 2.45 2.412 2.814 2.793 2.75 2.962 2.94 2.895 3.16 3.136 3.088 3.258 3.234 3.184 3.555 3.528 3.474 3.752 3.724 3.667 3.95 3.92 3.86 4.641 4.606 4.535 4.789 4.753 4.68 4.937 4.9 4.825 5 4.85 4.7 4 3.8 3.6 3.3 3.2 3 2.85 2.5 1.8 1.5 Typ. Max. 16 1.522 1.530 1.555 1.822 1.836 1.863 2.531 2.55 2.587 2.885 2.907 2.949 3.037 3.06 3.105 3.24 3.264 3.312 3.341 3.366 3.415 3.645 3.672 3.726 3.847 3.876 3.933 4.05 4.08 4.14 4.758 4.794 4.864 4.91 4.947 5.019 5.062 5.1 5.175 V V V V V V V V V V V V Unit V V
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LD2981 SERIES
Symbol VO IQ
Parameter Line Regulation Quiescent Current ON MODE
Test Conditions VO(NOM) + 1 < VIN < 16 V IO = 1 mA TJ= -40 to 125C IO = 0 IO = 0 IO = 1 mA IO = 1 mA IO = 25 mA IO = 25 mA IO = 100 mA IO = 100 mA TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C TJ= -40 to 125C
Min.
Typ. 0.003 80 100 250 1000
Max. 0.014 0.032 100 150 150 200 400 800 1300 2600 0.8 2
Unit %/V A
OFF MODE VDROP Dropout Voltage (NOTE 1)
VINH < 0.3 V VINH < 0.15 V IO = 0 IO = 0 IO = 1mA IO = 1mA IO = 25mA IO = 25mA IO = 100mA IO = 100mA TJ= -40 to 125C 150 f = 1KHz TJ= -40 to 125C TJ= -40 to 125C 1.6 0 5 160 170 63 TJ= -40 to 125C 180 TJ= -40 to 125C 70 TJ= -40 to 125C 7 1
3 5 10 15 100 150 250 375
mV
ISC SVR VINH VINL IINH eN TSHDN
Short Circuit Current Supply Voltage Rejection Inhibit Input Logic Low Inhibit Input Logic High Inhibit Input Current
RL = 0 CO = 10F LOW = Output OFF HIGH = Output ON VINH = 0V VINH = 5V
mA dB 0.18 V V -1 15 VRMS C A
TJ= -40 to 125C TJ= -40 to 125C CO = 10 F
Output Noise Voltage Thermal Shutdown
BW = 300 Hz to 50 KHz
(NOTE 1): For Vo < 2.5V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
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LD2981 SERIES
TYPICAL PERFORMANCE CHARACTERISTICS (Tj = 25C, VI = VO(NOM) +1V, CI = 1F(X7R), CO = 2.2F(X7R), VINH = 2V, unless otherwise specified) 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 : Quiescent Current vs Temperature
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Figure 7 : Quiescent Current vs Output Current Figure 10 : Dropout Voltage vs Output Current
Figure 8 : OFF MODE Quiescent Current vs Temperature
Figure 11 : Inhibit Input Current vs Temperature
Figure 9 : Quiescent Current vs Input Voltage
Figure 12 : Inhibit Voltage vs Temperature
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LD2981 SERIES
Figure 13 : Supply Voltage Rejection vs Frequency Figure 16 : Worst Case: Lowest Output Version
Figure 14 : Noise Voltage vs Frequency
Figure 17 : Load Transient Response
VO = 4.7V, IO = 1 to 100mA, CO = 4.7F X7R
Figure 15 : Best Case: Highest Output Version
Figure 18 : Line Transient Response
VI = (VO(NOM) + 1V), VO = 4.7V, IO = 100mA, CO = 4.7F X7R
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LD2981 SERIES
APPLICATION NOTES EXTERNAL CAPACITORS Like any low-dropout regulator, the LD2981 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 1F is required with the LD2981 (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 LD2981 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 ESR (equivalent series resistance) value. The figures 1 and 2 show the allowable ESR range as a function of the output capacitance. These curves represent the stability region over the full temperature and IO range. Due to the different loop gain, the stability improves for higher output versions and so the suggested minimum output capacitor value, if low ESR ceramic type is used, is 1F for output voltages equal or major than 3.8V, 2.2F for output voltages from 2.85 to 3.3V, and 3.3F 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 (see Figure1 & Figure2 to choose the right value according to the used version and keeping in account that the ESR of ceramic capacitors has been measured @ 100KHz). 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 1A. 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. REVERSE CURRENT The power transistor used in the LD2981 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, according to the test circuit in figure 19, flows to the GND across the two feedback resistors. This current typical value is 160A. R1 and R 2 resistors are implanted type; typical values are, respectively, 42.6 K and 51.150 K.
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LD2981 SERIES
Figure 19 : Reverse Current Test Circuit
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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
.
7049676C
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LD2981 SERIES
SOT-89 MECHANICAL DATA
mm. DIM. MIN. A B B1 C C1 D D1 E e e1 H L 1.4 0.44 0.36 0.35 0.35 4.4 1.62 2.29 1.42 2.92 3.94 0.89 TYP MAX. 1.6 0.56 0.48 0.44 0.44 4.6 1.83 2.6 1.57 3.07 4.25 1.2 MIN. 55.1 17.3 14.2 13.8 13.8 173.2 63.8 90.2 55.9 115.0 155.1 35.0 TYP. MAX. 63.0 22.0 18.9 17.3 17.3 181.1 72.0 102.4 61.8 120.9 167.3 47.2 mils
P025H
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LD2981 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
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LD2981 SERIES
Tape & Reel SOT89 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 4.70 4.30 1.70 3.9 7.9 4.80 4.40 1.80 4.0 8.0 12.8 20.2 60 14.4 4.90 4.50 1.90 4.1 8.1 0.185 0.169 0.067 0.153 0.311 0.189 0.173 0.071 0.157 0.315 13.0 TYP MAX. 180 13.2 0.504 0.795 2.362 0.567 0.193 0.177 0.075 0.161 0.319 0.512 MIN. TYP. MAX. 7.086 0.519 inch
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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 All other names are the property of their respective owners (c) 2003 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com
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