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LD2985Axx LD2985Bxx
Very low drop and low noise voltage regulator low ESR capacitors compatible, with inhibit function
Features

Very low dropout voltage (280 mV at 150 mA and 7 mV at 1 mA load) Very low quiescent current (2 mA typ. at 150 mA load and 80 A at no load) Output current up to 150 mA Logic controlled electronic shutdown Output voltage of 1.8, 2.5, 2.7, 2.8, 3, 3.3, 5 V Internal current and thermal limit Available in 1.5 % tolerance (at 25 C, A version) Low output noise voltage 30 mVrms Smallest package SOT23-5L Temperature range: - 40C to 125 C 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 = 10 nF, connected between bypass pin and GND reduce the noise to 30 Vrms. Typical application are in cellular phone, palmtop laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.
SOT23-5L
Description
The LD2985A/Bxx is a 150 mA 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 1 A when INHIBIT pin is pulled low. Shutdown logic control function is available on pin 3 (TTL compatible). This Table 1. Device summary
Part numbers A version LD2985AXX18 LD2985AXX25 LD2985AXX27 LD2985AXX28 LD2985AXX30 LD2985AXX33 LD2985AXX50 January 2009 B version LD2985BXX18 LD2985BXX25 LD2985BXX27 LD2985BXX28 LD2985BXX30 LD2985BXX33 LD2985BXX50 Rev 11 Output voltages 1.8 V 2.5 V 2.7 V 2.8 V 3.0 V 3.3 V 5.0 V 1/21
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Contents
LD2985Axx, LD2985Bxx
Contents
1 2 3 4 5 6 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1 6.2 6.3 6.4 6.5 6.6 External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7 8 9
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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LD2985Axx, LD2985Bxx
Diagram
1
Figure 1.
Diagram
Schematic diagram
3/21
Pin configuration
LD2985Axx, LD2985Bxx
2
Figure 2.
Pin configuration
Pin connections (top view)
Table 2.
Pin n 1 2 3 4 5
Pin description
Symbol IN GND INHIBIT Bypass OUT 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 Bypass pin: capacitor to be connected to GND in order to improve the thermal noise performances 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 Unit C/W C/W
4/21
LD2985Axx, LD2985Bxx
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 16 16 Internally limited Internally limited -65 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.
5/21
Electrical characteristics
LD2985Axx, LD2985Bxx
4
Table 5.
Symbol VOP VO
Electrical characteristics
Electrical characteristics for LD2985A (TJ = 25 C, VI = VO + 1 V, IO = 50 mA, VSHDN = 2 V, CI = CO = 1 F, unless otherwise specified).
Parameter Operating input voltage VI = 2.5V Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 2.8V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 3.5V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 3.7V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 3.8V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 3.85V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 4.0V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 4.1V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 4.2V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 4.3V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 4.5V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 4.6V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C Test conditions Min. 2.5 1.478 1.462 1.447 1.773 1.755 1.737 1.463 2.4375 2.4125 2.660 2.6325 2.6055 2.758 2.730 2.702 2.808 2.778 2.750 2.955 2.925 2.895 3.054 3.022 2.9915 3.152 3.120 3.088 3.251 3.2175 3.1845 3.448 3.412 3.377 3.546 3.510 3.474 3.6 3.5 3.3 3.2 3.1 3.0 2.85 2.8 2.7 2.5 1.8 1.5 Typ. Max. 16 1.522 1.538 1.553 1.827 1.845 1.863 2.537 2.5625 2.5875 2.740 2.7675 2.7945 2.842 2.870 2.898 2.892 2.921 2.950 3.045 3.075 3.105 3.146 3.1775 3.2085 3.248 3.280 3.312 3.349 3.3825 3.4155 3.552 3.587 3.622 3.654 3.690 3.726 V V V V V V V V V V V V Unit V
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LD2985Axx, LD2985Bxx Table 5.
Symbol
Electrical characteristics
Electrical characteristics for LD2985A (continued) (TJ = 25 C, VI = VO + 1 V, IO = 50 mA, VSHDN = 2 V, CI = CO = 1 F, unless otherwise specified).
Parameter VI = 4.8V Test conditions Min. 3.743 3.705 3.667 3.94 3.9 3.86 4.63 4.582 4.5355 4.925 4.875 4.825 400 0.003 0.014 0.032 1 7 40 120 280 80 100 200 600 2000 0 2 45 0.15 dB V 7/21 3 5 10 15 60 90 150 225 350 575 100 150 150 200 300 400 900 1200 3000 4000 A mV %/VI 5 4.7 4 Typ. 3.8 Max. 3.857 3.895 3.933 4.06 4.1 4.14 4.77 4.817 4.8645 5.075 5.125 5.175 mA V V V V Unit
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 5.0V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 5.7V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 6.0V
VO ISC VO/VI
Output voltage Short circuit current Line regulation
IO = 1 to 150mA IO = 1 to 150 mA, TJ= -40 to 125C RL = 0 VI = VO + 1V to 16V, IO = 1 mA VI = VO + 1V to 16V, IO = 1 mA, TJ= -40 to 125C IO = 0 IO = 0, TJ= -40 to 125C IO = 1mA IO = 1mA, TJ= -40 to 125C IO = 10mA IO = 10mA, TJ= -40 to 125C IO = 50mA IO = 50mA, TJ= -40 to 125C IO = 150mA IO = 150mA, TJ= -40 to 125C IO = 0 IO = 0, TJ= -40 to 125C IO = 1mA IO = 1mA, TJ= -40 to 125C
VDROP
Dropout voltage
Quiescent current ON MODE IQ
IO = 10mA IO = 10mA, TJ= -40 to 125C IO = 50mA IO = 50mA, TJ= -40 to 125C IO = 150mA IO = 150mA, TJ= -40 to 125C VINH<0.18V VINH<0.18V, TJ= -40 to 125C CBYP = 0.01F, CO = 10F, f = 1kHz TJ= -40 to 125C
OFF MODE SVR VIL Supply voltage rejection Control input logic low
Electrical characteristics Table 5.
Symbol VIH IINH eN
LD2985Axx, LD2985Bxx
Electrical characteristics for LD2985A (continued) (TJ = 25 C, VI = VO + 1 V, IO = 50 mA, VSHDN = 2 V, CI = CO = 1 F, unless otherwise specified).
Parameter Control input logic high Control input current Output noise voltage Test conditions TJ= -40 to 125C VINH = 5V, TJ= -40 to 125C VINH = 0V, TJ= -40 to 125C B = 300 Hz to 50 kHz, CBYP = 0.01F, CO = 10F Min. 2 5 0 30 15 -1 Typ. Max. Unit V A V
Table 6.
Symbol VOP VO
Electrical characteristics for LD2985B (TJ = 25 C, VI = VO + 1 V, IO = 50 mA, VSHDN = 2 V, CI = CO = 1 F, unless otherwise specified).
Parameter Operating input voltage VI = 2.5V Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 2.8V Test conditions Min. 2.5 1.463 1.455 1.440 1.755 1.746 1.728 2.437 2.425 2.4 2.633 2.619 2.592 2.73 2.716 2.688 2.779 2.764 2.736 2.925 2.91 2.88 3.023 3.007 2.976 3.120 3.104 3.072 3.218 3.201 3.168 3.3 3.2 3.1 3.0 2.85 2.8 2.7 2.5 1.8 1.5 Typ. Max. 16 1.537 1.545 1.560 1.845 1.854 1.872 2.562 2.575 2.6 2.767 2.781 2.808 2.87 2.884 2.912 2.921 2.935 2.964 3.075 3.09 3.12 3.177 3.193 3.224 3.28 3.296 3.328 3.382 3.399 3.432 V V V V V V V V V V Unit V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 3.5V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 3.5V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 3.8V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 3.85V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 4.0V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 4.1V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 4.2V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 4.3V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C
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LD2985Axx, LD2985Bxx Table 6.
Symbol
Electrical characteristics
Electrical characteristics for LD2985B (continued) (TJ = 25 C, VI = VO + 1 V, IO = 50 mA, VSHDN = 2 V, CI = CO = 1 F, unless otherwise specified).
Parameter VI = 4.5V Test conditions Min. 3.413 3.395 3.360 3.51 3.492 3.456 3.705 3.686 3.648 3.900 3.88 3.84 4.583 4.559 4.512 4.875 4.85 4.8 400 0.003 0.014 0.032 1 7 40 120 280 3 5 10 15 60 90 150 225 350 575 mV %/VI 5 4.7 4 3.8 3.6 Typ. 3.5 Max. 3.587 3.605 3.640 3.69 3.708 3.744 3.895 3.914 3.952 4.100 4.12 4.16 4.817 4.841 4.888 5.125 5.15 5.2 mA V V V V V V Unit
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 4.6V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 4.8V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 5.0V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 5.7V
VO
Output voltage
IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125C VI = 6.0V
VO ISC VO/VI
Output voltage Short circuit current Line regulation
IO = 1 to 150mA IO = 1 to 150 mA, TJ= -40 to 125C RL = 0 VI = VO + 1V to 16V, IO = 1 mA VI = VO + 1V to 16V, IO = 1 mA, TJ= -40 to 125C IO = 0 IO = 0, TJ= -40 to 125C IO = 1mA IO = 1mA, TJ= -40 to 125C IO = 10mA IO = 10mA, TJ= -40 to 125C IO = 50mA IO = 50mA, TJ= -40 to 125C IO = 150mA IO = 150mA, TJ= -40 to 125C
VDROP
Dropout voltage
9/21
Electrical characteristics Table 6.
Symbol
LD2985Axx, LD2985Bxx
Electrical characteristics for LD2985B (continued) (TJ = 25 C, VI = VO + 1 V, IO = 50 mA, VSHDN = 2 V, CI = CO = 1 F, unless otherwise specified).
Parameter IO = 0 IO = 0, TJ= -40 to 125C IO = 1mA IO = 1mA, TJ= -40 to 125C Quiescent current ON MODE IO = 10mA IO = 10mA, TJ= -40 to 125C IO = 50mA IO = 50mA, TJ= -40 to 125C IO = 150mA IO = 150mA, TJ= -40 to 125C OFF MODE VINH<0.18V VINH<0.18V, TJ= -40 to 125C CBYP = 0.01F, CO = 10F, f = 1kHz TJ= -40 to 125C TJ= -40 to 125C VINH = 0V, TJ= -40 to 125C VINH = 5V, TJ= -40 to 125C B = 300 Hz to 50 kHz, CBYP = 0.01F, CO = 10F 2 5 0 30 15 -1 45 0.15 0 2 dB V V A V 2000 600 200 100 Test conditions Min. Typ. 80 Max. 100 150 150 200 300 400 900 1200 3000 4000 A Unit
IQ
SVR VIL VIH IINH eN
Supply voltage rejection Inhibit input logic low Inhibit input logic high Inhibit input current Output noise voltage
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LD2985Axx, LD2985Bxx
Typical characteristics
5
Typical 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 4. Dropout voltage vs temperature
Figure 3.
Figure 5.
Dropout voltage vs output current
Figure 6.
Quiescent current vs load current
Figure 7.
Quiescent current vs temperature
Figure 8.
Supply voltage rejection vs temp.
11/21
Typical characteristics
LD2985Axx, LD2985Bxx
Figure 9.
Supply voltage rejection vs output current
Figure 10. Supply voltage rejection vs output current
Figure 11. Supply voltage rejection vs frequency
Figure 12. Supply voltage rejection vs frequency
Figure 13. Line transient
Figure 14. Line transient
VO = 2.5V, IO = 50mA, no CI, CO = 4.7F, tr=tf=2ns
VO = 2.5V, IO = 50mA, no CI, CO = 4.7F, tr=tf=1s
12/21
LD2985Axx, LD2985Bxx
Typical characteristics
Figure 15. Load transient
Figure 16. Load transient
VO = 2.5V, IO = 0 to 50mA, no CI, CO = 10F, tr=tf=2ns
VO = 2.5V, IO = 0 to 50mA, no CI, CO = 4.7F, tr=tf=2ns
13/21
Application notes
LD2985Axx, LD2985Bxx
6
6.1
Application notes
External capacitors
Like any low-dropout regulator, the LD2985 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.
6.2
Input capacitor
An input capacitor whose value is 1 F is required with the LD2985 (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.
6.3
Output capacitor
The LD2985 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. 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 VO going from 1.8 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.
6.4
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.
6.5
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.
14/21
LD2985Axx, LD2985Bxx
Application notes
6.6
Reverse current
The power transistor used in the LD2985 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 160 A. R1 and R2 resistors are implanted type; typical values are, respectively, 42.6 k and 51.150 k.
Figure 17. Reverse current test circuit
15/21
Package mechanical data
LD2985Axx, LD2985Bxx
7
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark.
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LD2985Axx, LD2985Bxx
Package mechanical data
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
17/21
Package mechanical data
LD2985Axx, LD2985Bxx
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.
18/21
LD2985Axx, LD2985Bxx
Order codes
8
Table 7.
Order codes
Order codes
A version LD2985AM18R LD2985AM25R B version LD2985BM18R LD2985BM25R LD2985BM27R LD2985AM28R LD2985AM30R LD2985AM33R LD2985AM50R LD2985BM28R LD2985BM30R LD2985BM33R LD2985BM50R Output voltages 1.8 V 2.5 V 2.7 V 2.8 V 3.0 V 3.3 V 5.0 V
19/21
Revision history
LD2985Axx, LD2985Bxx
9
Table 8.
Date
Revision history
Document revision history
Revision 4 5 6 7 8 9 10 11 Changes Add new value VO ==> 2.7 V on tables 5 and 6. Mistake VO min. ==> 2.7 V on table 5. Order codes updated. Added: Table 1 on page 1. Modified: Table 5 on page 6 and Table 6 on page 8. Modified: Table 1 on page 1 and Table 7 on page 19. Modified: Features on page 1. Modified: Features on page 1.
22-Aug-2005 02-Sep-2005 25-Jul-2006 13-Feb-2008 04-Mar-2008 10-Jul-2008 27-Aug-2008 27-Jan-2009
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LD2985Axx, LD2985Bxx
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