View LD2982AM27R_4218491.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LD2982Axx LD2982Bxx
Very low drop and low noise voltage regulator with inhibit function, low ESR capacitors compatible
Features

Very low dropout voltage (120 mV at 50 mA and 7 mV at 1 mA load) Very low quiescent current (375 mA typ. at 50 mA load and 75 mA at 1 mA) Output current up to 50 mA Logic controlled electronic shutdown Output voltage of 1.8, 2.7, 3.2, 3.3 V Internal current and thermal limit Available in 1 % tolerance (at 25 C, A version) Supply voltage rejection: 45 dB (typ) Only 1 F for stability Low output noise voltage 30 Vrms Smallest package SOT23-5L Temperature range: -40 C to 125 C 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 LD2982A/Bxx is a 50 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 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. Table 1. Device summary
Part numbers A Version LD2982AXX18 LD2982AXX27 LD2982AXX32 B Version LD2982BXX18 LD2982BXX27 LD2982BXX32 Output voltage 1.8 V 2.7 V 3.2 V
July 2008
Rev 6
1/20
www.st.com 20
LD2982Axx - LD2982Bxx
Contents
1 2 3 4 5 6 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.1 6.2 6.3 6.4 6.5 6.6 External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7 8 9
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/20
LD2982Axx - LD2982Bxx
Diagram
1
Figure 1.
Diagram
Schematic diagram
3/20
Pin configuration
LD2982Axx - LD2982Bxx
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
4/20
LD2982Axx - LD2982Bxx
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.
5/20
Electrical characteristics
LD2982Axx - LD2982Bxx
4
Table 5.
Symbol VOP VO
Electrical characteristics
Electrical characteristics for LD2982A (TJ = 25 C, VI = VO + 1 V, IO =1 mA, VSHDN = 2V, CI = CO = 1 F, unless otherwise specified).
Parameter Operating input voltage VI = 2.5V Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 2.8V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 3.5V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 3.8V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 3.85V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.0V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.1V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.2V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.3V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.5V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.6V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.8V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C Test conditions Min. 2.5 1.485 1.477 1.470 1.782 1.773 1.764 2.475 2.462 2.45 2.772 2.758 2.744 2.821 2.807 2.793 2.970 2.955 2.94 3.069 3.053 3.038 3.168 3.152 3.136 3.267 3.250 3.234 3.465 3.447 3.43 3.564 3.546 3.528 3.762 3.743 3.724 3.8 3.6 3.5 3.3 3.2 3.1 3.0 2.85 2.8 2.5 1.8 1.5 Typ. Max. 16 1.515 1.523 1.530 1.818 1.827 1.836 2.525 2.537 2.55 2.828 2.842 2.856 2.879 2.893 2.907 3.030 3.045 3.06 3.131 3.146 3.162 3.232 3.248 3.264 3.333 3.349 3.366 3.535 3.552 3.57 3.636 3.654 3.672 3.838 3.857 3.876 V V V V V V V V V V V V Unit V
6/20
LD2982Axx - LD2982Bxx Table 5.
Symbol
Electrical characteristics
Electrical characteristics for LD2982A (continued) (TJ = 25 C, VI = VO + 1 V, IO =1 mA, VSHDN = 2V, CI = CO = 1 F, unless otherwise specified).
Parameter VI = 5.0V Test conditions Min. 3.96 3.94 3.92 4.653 4.629 4.606 4.95 4.925 4.9 150 0.003 0.014 0.032 1 7 40 120 80 100 200 600 0 1 45 0.15 2 5 0 30 15 -1 dB V V A V 3 5 10 15 60 90 150 225 100 150 150 200 300 400 900 1200 A mV %/VI 5 4.7 Typ. 4 Max. 4.04 4.06 4.08 4.747 4.77 4.794 5.05 5.075 5.1 mA V V V Unit
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 5.7V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 6.0V
VO ISC VO/VI
Output voltage Short circuit current Line regulation
IO = 1 to 50mA IO = 1 to 100 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 = 0 IO = 0, TJ= -40 to 125C IO = 1mA
VDROP
Dropout voltage
Quiescent current ON MODE IQ
IO = 1mA, TJ= -40 to 125C IO = 10mA IO = 10mA, TJ= -40 to 125C IO = 50mA IO = 50mA, 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 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
OFF MODE SVR VIL VIH IINH eN Supply voltage rejection Inhibit input logic low Inhibit input logic high Inhibit input current Output noise voltage
7/20
Electrical characteristics Table 6.
Symbol VOP VO
LD2982Axx - LD2982Bxx
Electrical characteristics for LD2982B (TJ = 25 C, VI = VO + 1 V, IO = 1 mA, VSHDN = 2 V, CI = CO = 1 F, unless otherwise specified).
Parameter Operating input voltage VI = 2.5V Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 2.8V Test conditions Min. 2.5 1.477 1.470 1.447 1.773 1.764 1.737 2.462 2.45 2.412 2.758 2.744 2.702 2.807 2.793 2.750 2.955 2.94 2.895 3.053 3.038 2.991 3.152 3.136 3.088 3.250 3.234 3.184 3.447 3.430 3.377 3.546 3.528 3.474 3.743 3.724 3.667 3.8 3.6 3.5 3.3 3.2 3.1 3.0 2.85 2.8 2.5 1.8 1.5 Typ. Max. 16 1.523 1.530 1.553 1.827 1.836 1.863 2.537 2.55 2.587 2.842 2.856 2.898 2.893 2.907 2.950 3.045 3.06 3.105 3.146 3.162 3.208 3.248 3.264 3.312 3.349 3.366 3.415 3.552 3.370 3.662 3.654 3.672 3.726 3.857 3.876 3.933 V V V V V V V V V V V V Unit V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 3.5V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 3.8V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 3.85V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.0V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.1V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.2V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.3V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.5V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.6V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 4.8V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C
8/20
LD2982Axx - LD2982Bxx Table 6.
Symbol
Electrical characteristics
Electrical characteristics for LD2982B (continued) (TJ = 25 C, VI = VO + 1 V, IO = 1 mA, VSHDN = 2 V, CI = CO = 1 F, unless otherwise specified).
Parameter VI = 5.0V Test conditions Min. 3.94 3.92 3.86 4.629 4.606 4.535 4.925 4.9 4.825 400 0.003 0.014 0.032 1 7 40 120 80 100 200 600 0 1 45 0.15 2 5 0 30 15 -1 dB V V A V 3 5 10 15 60 90 150 225 100 150 150 200 300 400 900 1200 A mV %/VI 5 4.7 Typ. 4 Max. 4.06 4.08 4.14 4.77 4.794 4.864 5.075 5.1 5.175 mA V V V Unit
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 5.7V
VO
Output voltage
IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125C VI = 6.0V
VO ISC VO/VI
Output voltage Short circuit current Line regulation
IO = 1 to 50mA IO = 1 to 100 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 = 0 IO = 0, TJ= -40 to 125C IO = 1mA
VDROP
Dropout voltage
Quiescent current ON MODE IQ
IO = 1mA, TJ= -40 to 125C IO = 10mA IO = 10mA, TJ= -40 to 125C IO = 50mA IO = 50mA, 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 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
OFF MODE SVR VIL VIH IINH eN Supply voltage rejection Inhibit input logic low Inhibit input logic high Inhibit input current Output noise voltage
9/20
Typical characteristics
LD2982Axx - LD2982Bxx
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.
10/20
LD2982Axx - LD2982Bxx
Typical characteristics
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
11/20
Typical characteristics
LD2982Axx - LD2982Bxx
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
12/20
LD2982Axx - LD2982Bxx
Application notes
6
6.1
Application notes
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.
6.2
Input capacitor
An input capacitor whose value is 1 F 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.
6.3
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 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.
13/20
Application notes
LD2982Axx - LD2982Bxx
6.6
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 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
14/20
LD2982Axx - LD2982Bxx
Package mechanical data
7
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.
15/20
Package mechanical data
LD2982Axx - LD2982Bxx
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
16/20
LD2982Axx - LD2982Bxx
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.
17/20
Order codes
LD2982Axx - LD2982Bxx
8
Table 7.
Order codes
Order codes
A Version LD2982AM18R LD2982AM27R LD2982AM32R B Version LD2982BM18R LD2982BM27R LD2982BM32R Output voltage 1.8 V 2.7 V 3.2 V
18/20
LD2982Axx - LD2982Bxx
Revision history
9
Table 8.
Date
Revision history
Document revision history
Revision 4 5 6 Order codes updated. Added: Table 1 on page 1. Modified: Table 1 on page 1 and Table 7 on page 18. Changes
25-Jul-2006 14-Feb-2008 10-Jul-2008
19/20
LD2982Axx - LD2982Bxx
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
(c) 2008 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 of America www.st.com
20/20

▲Up To Search▲

Price & Availability of LD2982AM27R

	To Download LD2982AM27R Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .