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LD2985AXX_09

LD2985AXX_09

  • 厂商:

    STMICROELECTRONICS(意法半导体)

  • 封装:

  • 描述:

    LD2985AXX_09 - Very low drop and low noise voltage regulator low ESR capacitors compatible, with inh...

  • 数据手册
  • 价格&库存
LD2985AXX_09 数据手册
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 µA 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: - 40°C 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 µVrms. 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 µA 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 www.st.com 21 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 2/21 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 µF, unless otherwise specified). Parameter Operating input voltage VI = 2.5V Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C VI = 2.8V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C VI = 3.5V VO Output voltage IO = 1 to 50mA IO = 1 to 50mA, TJ= -40 to 125°C VI = 3.7V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C VI = 3.8V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C VI = 3.85V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C VI = 4.0V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C VI = 4.1V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C VI = 4.2V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C VI = 4.3V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C VI = 4.5V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C VI = 4.6V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C 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 6/21 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 µF, 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 µA 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 125°C VI = 5.0V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C VI = 5.7V VO Output voltage IO = 1 to 150mA IO = 1 to 150mA, TJ= -40 to 125°C VI = 6.0V VO ISC ΔVO/ΔVI Output voltage Short circuit current Line regulation IO = 1 to 150mA IO = 1 to 150 mA, TJ= -40 to 125°C RL = 0 VI = VO + 1V to 16V, IO = 1 mA VI = VO + 1V to 16V, IO = 1 mA, TJ= -40 to 125°C IO = 0 IO = 0, TJ= -40 to 125°C IO = 1mA IO = 1mA, TJ= -40 to 125°C IO = 10mA IO = 10mA, TJ= -40 to 125°C IO = 50mA IO = 50mA, TJ= -40 to 125°C IO = 150mA IO = 150mA, TJ= -40 to 125°C IO = 0 IO = 0, TJ= -40 to 125°C IO = 1mA IO = 1mA, TJ= -40 to 125°C VDROP Dropout voltage Quiescent current ON MODE IQ IO = 10mA IO = 10mA, TJ= -40 to 125°C IO = 50mA IO = 50mA, TJ= -40 to 125°C IO = 150mA IO = 150mA, TJ= -40 to 125°C VINH
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