LD2982BM18R

LD2982BXX18 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 V ■ Internal current and thermal limit ■ Available in ± 1 % tolerance (at 25 °C, A version) ■ Supply voltage rejection: 45 dB (typ) ■ Only 1 µF for stability ■ Low output noise voltage 30 µVrms ■ Smallest package SOT23-5L ■ Temperature range: -40 °C to 125 °C P e et c u d o r P SOT23-5L e t e ) s t( c u d o r Typical application are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera. l o s ) s t( c u d ro Description ) s t( b O - l o bs P e et O ) s ( t c u d The LD2982 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 µA 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. l o s Ob o r eP t e ol s b O An external capacitor CBYP = 10 nF connected between bypass pin and GND reduce the noise to 30 µVrms. Table 1. July 2009 Device summary Order code Output voltage LD2982BM18R 1.8 V Doc ID 8188 Rev 7 1/17 www.st.com 17 Contents LD2982BXX18 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 ) s t( c u d e t e o r P ) s t( 6.1 External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.2 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.3 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.4 Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.5 Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 l o s ) s t( b O - P e et c u d o r l o c data . . . . . . .b. .s. . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7 Package mechanical u d O o 8 Revision rhistory . . . . . . ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 P s t( e t c u le d o o s r b P O e t e l o s b O 6.6 2/17 Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Doc ID 8188 Rev 7 LD2982BXX18 Diagram 1 Diagram Figure 1. Schematic diagram ) s t( c u d e t e l o s ) s t( c u d ro P e et l o s Ob b O - l o bs o r P ) s t( c u d o r P e et O ) s ( t c u d o r eP t e ol s b O Doc ID 8188 Rev 7 3/17 Pin configuration LD2982BXX18 2 Pin configuration Figure 2. Pin connections (top view) ) s t( Table 2. c u d Pin description ) s t( Pin n° Symbol 1 IN 2 GND 3 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 4 Bypass Bypass Pin: Capacitor to be connected to GND in order to improve the thermal noise performances 5 OUT Table 3. Symbol Name and function o r P l o s Ground pin Output port eP ) s t( c u d ro Thermal data t e l o e t e Input port b O - l o bs O ) s ( t c u d Parameter P e et SOT23-5L Unit RthJC Thermal resistance junction-case 81 °C/W RthJA Thermal resistance junction-ambient 255 °C/W o s r b P O e t e l o s b O 4/17 c u d o r Doc ID 8188 Rev 7 LD2982BXX18 Maximum ratings 3 Maximum ratings Table 4. Absolute maximum ratings Symbol VI Parameter VINH Value Unit DC input voltage 16 V INHIBIT input voltage 16 V IO Output current Internally limited PD Power dissipation Internally limited TSTG Storage temperature range -65 to 150 TOP Operating junction temperature range -40 to 125 Note: ) s t( °C c u d °C o r P Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. e t e l o s ) s t( c u d ro P e et l o s Ob b O - l o bs ) s t( c u d o r P e et O ) s ( t c u d o r eP t e ol s b O Doc ID 8188 Rev 7 5/17 Electrical characteristics 4 LD2982BXX18 Electrical characteristics TJ = 25 °C, VI = VO + 1 V, IO = 1 mA, VSHDN = 2 V, CI = CO = 1 µF, unless otherwise specified. Table 5. Electrical characteristics for LD2982BXX18 Symbol VOP Parameter Test conditions Min. Operating input voltage 2.5 VI = 2.5V VO VO VO Output voltage Output voltage Output voltage 1.477 IO = 1 to 50mA 1.470 IO = 1 to 50mA, TJ= -40 to 125°C 1.447 VI = 2.8V 1.773 IO = 1 to 50mA 1.764 1.737 2.462 e t e IO = 1 to 50mA ol VI = 3.8V Output voltage IO = 1 to 50mA bs -O IO = 1 to 50mA, TJ= -40 to 125°C ) s ( VI = 3.85V VO Output voltage IO = 1 to 50mA t c u d o r VO Output voltage VO eP t e l o VO VO VO 6/17 Output voltage Output voltage Output voltage Output voltage O ) IO = 1 to 50mA t(s ) s ( 2.5 1.836 ) s t( 2.537 2.55 c u d o r 2.8 2.842 2.856 2.85 3.0 2.94 2.895 2.893 V 3.045 3.06 V 3.105 3.1 3.146 IO = 1 to 50mA 3.038 3.162 IO = 1 to 50mA, TJ= -40 to 125°C 2.991 3.208 VI = 4.2V 3.152 IO = 1 to 50mA 3.136 3.264 IO = 1 to 50mA, TJ= -40 to 125°C 3.088 3.312 VI = 4.3V 3.250 3.2 3.3 V 3.349 IO = 1 to 50mA 3.234 3.366 3.184 3.415 VI = 4.5V 3.447 IO = 1 to 50mA 3.430 3.5 V 3.248 IO = 1 to 50mA, TJ= -40 to 125°C V 3.552 3.370 IO = 1 to 50mA, TJ= -40 to 125°C 3.377 VI = 4.6V 3.546 IO = 1 to 50mA 3.528 3.672 IO = 1 to 50mA, TJ= -40 to 125°C 3.474 3.726 Doc ID 8188 Rev 7 V 2.898 2.907 3.053 V 2.587 2.950 IO = 1 to 50mA, TJ= -40 to 125°C V 1.863 2.793 2.955 V 1.827 2.750 VI = 4.1V c u d Output voltage o s r b P O e t e l o s b O VO VI = 4.0V V t c u od 2.758 2.807 16 1.523 1.8 eP let Unit 1.530 2.412 2.744 Max. 1.553 2.45 2.702 o s b IO = 1 to 50mA, TJ= -40 to 125°C 1.5 Pr IO = 1 to 50mA, TJ= -40 to 125°C VI = 3.5V IO = 1 to 50mA, TJ= -40 to 125°C VO Typ. V 3.662 3.6 3.654 V LD2982BXX18 Table 5. Electrical characteristics Electrical characteristics for LD2982BXX18 (continued) Symbol VO Parameter Test conditions Output voltage VO Output voltage VO Output voltage VO Output voltage Min. Typ. Max. VI = 4.8V 3.743 3.8 3.857 IO = 1 to 50mA 3.724 IO = 1 to 50mA, TJ= -40 to 125°C 3.667 VI = 5.0V 3.94 IO = 1 to 50mA 3.92 4.08 IO = 1 to 50mA, TJ= -40 to 125°C 3.86 4.14 VI = 5.7V 4.629 IO = 1 to 50mA 4.606 4.794 IO = 1 to 50mA, TJ= -40 to 125°C 4.535 4.864 VI = 6.0V 4.925 IO = 1 to 50mA Short circuit current ΔVO/ΔVI Line regulation 4.825 VI = VO + 1V to 16V, IO = 1 mA, TJ= -40 to 125°C bs IO = 0 -O IO = 1mA VDROP Dropout voltage uc Ob r P e let IQ t e ol s b O OFF MODE IO = 50mA 0.003 0.014 ) s t( 7 120 80 200 IO = 10mA, TJ= -40 to 125°C 600 IO = 50mA, TJ= -40 to 125°C Output noise voltage 150 300 900 1 45 dB 0.15 2 V V VINH = 0V, TJ= -40 to 125°C 5 15 VINH = 5V, TJ= -40 to 125°C 0 -1 B = 300 Hz to 50 kHz, CBYP = 0.01µF, CO = 10µF 30 Doc ID 8188 Rev 7 µA 0 VINH