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LD2981ABxx LD2981Cxx
Ultra low drop voltage regulators with inhibit low ESR output capacitors compatible
Features

Stable with low ESR ceramic capacitors Ultra low dropout voltage (0.17 V typ. at 100 mA load, 7 mV typ. at 1 mA load) Very low quiescent current (80 A typ. at no load in on mode; max 1 A in off mode) Guaranteed output current up to 100mA Logic-controlled electronic shutdown Output voltage of 2.5; 3.0; 3.3; 5.0 V Internal current and thermal limit 0.75 % tolerance output voltage available (A version) Output low noise voltage 160 VRMS Temperature range: -40 to 125 C Smallest package SOT23-5L and SOT-89 Fast dynamic response to line and load changes logic control function is available on pin n 3 (TTL compatible). This means that when thedevice is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. The LD2981AB/C 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.
SOT23-5L SOT-89
Description
The LD2981AB/C series are 100 mA fixed-output voltage regulator. The low drop-voltage and the 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 1 A when INHIBIT pin is pulled low. Shutdown Table 1. Device summary
Part numbers Output voltage AB Version LD2981ABXX25 LD2981ABXX30 LD2981ABXX33 LD2981ABXX50 C Version LD2981CXX25 LD2981CXX30 LD2981CXX33 LD2981CXX50 2.5 V 3.0 V 3.3 V 5.0 V
July 2008
Rev 14
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www.st.com 23
LD2981ABxx - LD2981Cxx
Contents
1 2 3 4 5 6 7 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1 7.2 7.3 7.4 7.5 7.6 External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8 9 10
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
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LD2981ABxx - LD2981Cxx
Diagram
1
Figure 1.
Diagram
Schematic diagram
3/23
Pin configuration
LD2981ABxx - LD2981Cxx
2
Figure 2.
Pin configuration
Pin connections (top view)
SOT23-5L
SOT-89
Table 2.
Pin n SOT23-5L 1 2 3 4 5
Pin description
Pin n SOT-89 3 2 Symbol VIN GND INHIBIT NC 1 VOUT 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 0.18 V Not connected Output port Name and function
Table 3.
Symbol RthJC RthJA
Thermal data
Parameter Thermal resistance junction-case Thermal resistance junction-ambient SOT23-5L 81 255 SOT-89 15 110 Unit C/W C/W
4/23
LD2981ABxx - LD2981Cxx
Maximum ratings
3
Table 4.
Maximum ratings
Absolute maximum ratings
Parameter DC input voltage INHIBIT input voltage Output current Power dissipation Storage temperature range Operating junction temperature range Value -0.3 to 16 -0.3 to 16 Internally limited Internally limited -55 to 150 -40 to 125 C C Unit V V
Symbol VI VINH IO PD TSTG TOP
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
5/23
Typical application
LD2981ABxx - LD2981Cxx
4
Figure 3.
Typical application
Application circuit
Note:
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 0.18 V.
6/23
LD2981ABxx - LD2981Cxx
Electrical characteristics
5
Table 5.
Symbol VOP VO
Electrical characteristics
Electrical characteristics for LD2981AB (TJ = 25 C, VI = VO(NOM) +1 V, CI = 1 F (X7R), CO = 2.2 F (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified).
Parameter Operating input voltage IO = 1 mA Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA VO Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA VO Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA VO Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA VO Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA VO Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA VO Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA VO Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA VO Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA VO Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA VO Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C VO Line regulation VO(NOM) + 1 < VIN < 16 V, IO = 1 mA 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 V Unit V
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Electrical characteristics Table 5.
Symbol
LD2981ABxx - LD2981Cxx
Electrical characteristics for LD2981AB (continued) (TJ = 25 C, VI = VO(NOM) +1 V, CI = 1 F (X7R), CO = 2.2 F (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified).
Parameter IO = 0 IO = 0, TJ= -40 to 125C IO = 1 mA Quiescent current ON MODE IO = 1 mA, TJ= -40 to 125C IO = 25 mA IO = 25 mA, TJ= -40 to 125C IO = 100 mA IO = 100 mA, TJ= -40 to 125C OFF MODE VINH < 0.3 V VINH < 0.15 V, TJ= -40 to 125C IO = 0 IO = 0, TJ= -40 to 125C IO = 1mA 7 70 180 150 63 0.18 1.6 0 5 160 170 -1 15 IO = 1mA, TJ= -40 to 125C IO = 25mA IO = 25mA, TJ= -40 to 125C IO = 100mA IO = 100mA, TJ= -40 to 125C 1 1000 250 100 Test conditions Min. Typ. 80 Max. 100 150 150 200 400 800 1300 2600 0.8 2 3 5 10 15 100 150 250 375 mA dB V V A VRMS C mV A Unit
IQ
VDROP
Dropout voltage (1)
ISC SVR VINH VINL IINH eN TSHDN
Short circuit current Supply voltage rejection Inhibit input logic low Inhibit input logic high Inhibit input current Output noise voltage Thermal shutdown
RL = 0 CO = 10F, f = 1KHz LOW = Output OFF, TJ= -40 to 125C HIGH = Output ON, TJ= -40 to 125C VINH = 0V, TJ= -40 to 125C VINH = 5V, TJ= -40 to 125C BW = 300 Hz to 50 KHz, CO = 10F
1. For VO < 2.5 V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
8/23
LD2981ABxx - LD2981Cxx Table 6.
Symbol VOP VO
Electrical characteristics
Electrical characteristics for LD2981C (TJ = 25 C, VI = VO(NOM) +1 V, CI = 1 F (X7R), CO = 2.2 F (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified)
Parameter Operating input voltage IO = 1 mA Output voltage IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA 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 4.85 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 V V V V V V V V V V V V Unit V
VO
Output voltage
IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA
VO
Output voltage
IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA
VO
Output voltage
IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA
VO
Output voltage
IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA
VO
Output voltage
IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA
VO
Output voltage
IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA
VO
Output voltage
IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA
VO
Output voltage
IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA
VO
Output voltage
IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA
VO
Output voltage
IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C IO = 1 mA
VO
Output voltage
IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C
9/23
Electrical characteristics Table 6.
Symbol
LD2981ABxx - LD2981Cxx
Electrical characteristics for LD2981C (continued) (TJ = 25 C, VI = VO(NOM) +1 V, CI = 1 F (X7R), CO = 2.2 F (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified)
Parameter IO = 1 mA Test conditions Min. 4.937 4.9 4.825 0.003 80 100 250 1000 Typ. 5 Max. 5.062 5.1 5.175 0.014 0.032 100 150 150 200 400 800 1300 2600 0.8 2 1 7 70 180 150 63 0.18 1.6 0 5 160 170 -1 15 3 5 10 15 100 150 250 375 mA dB V V F VRMS C mV A %/V V Unit
VO
Output voltage
IO = 1 to 100 mA IO = 1 to 100 mA, TJ= -40 to 125C VO(NOM) + 1 < VIN < 16 V, IO = 1 mA TJ= -40 to 125C IO = 0 IO = 0, TJ= -40 to 125C IO = 1 mA
VO
Line regulation
Quiescent current ON MODE IQ
IO = 1 mA, TJ= -40 to 125C IO = 25 mA IO = 25 mA, TJ= -40 to 125C IO = 100 mA IO = 100 mA, TJ= -40 to 125C VINH < 0.3 V VINH < 0.15 V, TJ= -40 to 125C IO = 0 IO = 0, TJ= -40 to 125C IO = 1 mA IO = 1 mA, TJ= -40 to 125C IO = 25 mA IO = 25 mA, TJ= -40 to 125C IO = 100 mA IO = 100 mA, TJ= -40 to 125C
OFF MODE
VDROP
Dropout voltage (1)
ISC SVR VINH VINL IINH eN TSHDN
Short circuit current Supply voltage rejection Inhibit input logic low Inhibit input logic high Inhibit input current Output noise voltage Thermal shutdown
RL = 0 CO = 10F, f = 1KHz LOW = Output OFF, TJ= -40 to 125C HIGH = Output ON, TJ= -40 to 125C VINH = 0V, TJ= -40 to 125C VINH = 5V, TJ= -40 to 125C BW = 300 Hz to 50 KHz, CO = 10F
1. For VO < 2.5 V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
10/23
LD2981ABxx - LD2981Cxx
Typical performance characteristics
6
Typical performance characteristics
(TJ = 25 C, VI = VO(NOM) +1 V, CI = 1 F (X7R), CO = 2.2 F (X7R), VINH = 2 V, unless otherwise specified). Output voltage vs temperature Figure 5. Dropout voltage vs temperature
Figure 4.
Figure 6.
Line regulation vs temperature
Figure 7.
Load regulation vs temperature
Figure 8.
Dropout voltage vs temperature
Figure 9.
Quiescent current vs temperature
11/23
Typical performance characteristics
LD2981ABxx - LD2981Cxx
Figure 10. Quiescent current vs output current
Figure 11. Off mode quiescent current vs temperature
Figure 12. Quiescent current vs input voltage Figure 13. Dropout voltage vs output current
Figure 14. Inhibit input current vs temperature Figure 15. Inhibit voltage vs temperature
12/23
LD2981ABxx - LD2981Cxx
Typical performance characteristics
Figure 16. Supply voltage rejection vs frequency
Figure 17. Noise voltage vs frequency
Figure 18. Best case: highest output version
Figure 19. Worst case: lowest output version
Figure 20. Load transient response
Figure 21. Line transient response
VO = 4.7V, IO = 1 to 100mA, CO = 4.7F (X7R)
VI = [VO(NOM) +1V], VO = 4.7V, IO = 100mA, CO = 4.7F (X7R)
13/23
Application notes
LD2981ABxx - LD2981Cxx
7
7.1
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.
7.2
Input capacitor
An input capacitor whose value is 1 F 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.
7.3
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 Figure 3 and Figure 4 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 1 F for output voltages equal or major than 3.8 V, 2.2 F for output voltages from 2.85 to 3.3 V, and 3.3 F 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 Figure 1 and Figure 2 to choose the right value according to the used version and keeping in account that the ESR of ceramic capacitors has been measured @ 100 kHz).
7.4
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.
7.5
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 1 A. 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.
14/23
LD2981ABxx - LD2981Cxx
Application notes
7.6
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 22, flows to the GND across the two feedback resistors. This current typical value is 160 A. R1 and R2 resistors are implanted type; typical values are, respectively, 42.6 k and 51.150 k.
Figure 22. Reverse current test circuit
15/23
Package mechanical data
LD2981ABxx - LD2981Cxx
8
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.
16/23
LD2981ABxx - LD2981Cxx
Package mechanical data
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
17/23
Package mechanical data
LD2981ABxx - LD2981Cxx
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
18/23
LD2981ABxx - LD2981Cxx
Package mechanical data
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.
19/23
Package mechanical data
LD2981ABxx - LD2981Cxx
Tape & reel SOT-89 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.
20/23
LD2981ABxx - LD2981Cxx
Order codes
9
Table 7.
Order codes
Order codes
AB Version SOT23-5L LD2981ABM25TR LD2981ABM30TR LD2981ABM33TR LD2981ABM50TR SOT-89 LD2981ABU25TR (1) LD2981ABU30TR
(1)
C Version Output voltage SOT23-5L SOT-89 LD2981CU25TR (1) LD2981CM30TR LD2981CM33TR LD2981CM50TR LD2981CU30TR
(1)
2.5 V 3.0 V 3.3 V 5.0 V
LD2981ABU33TR LD2981ABU50TR
LD2981CU33TR LD2981CU50TR
1. Available on request.
21/23
Revision history
LD2981ABxx - LD2981Cxx
10
Table 8.
Date
Revision history
Document revision history
Revision 12 13 14 Order codes updated. Added: Table 1 on page 1. Modified: Table 1 on page 1 and Table 7 on page 21. Changes
25-Jul-2006 14-Feb-2008 14-Jul-2008
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LD2981ABxx - LD2981Cxx
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