{"id":3678,"date":"2026-06-08T02:01:51","date_gmt":"2026-06-08T02:01:51","guid":{"rendered":"https:\/\/materialparts.com\/lp2985-33dbvr\/"},"modified":"2026-06-08T02:01:51","modified_gmt":"2026-06-08T02:01:51","slug":"lp2985-33dbvr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/lp2985-33dbvr\/","title":{"rendered":"LP2985-33DBVR"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The LP2985-33DBVR is a 150mA low-noise, low-dropout voltage regulator from Texas Instruments, featuring a fixed 3.3V output in a compact SOT-23-5 package. With an input voltage range of 2.5V to 16V and ultra-low quiescent current, it is ideal for battery-powered and portable applications.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n
Output Voltage<\/td>\n3.3V Fixed<\/td>\n<\/tr>\n
\u8f93\u51fa\u7535\u6d41<\/td>\n150mA<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n2.5V to 16V<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n280mV (typ)<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n71uA (typ)<\/td>\n<\/tr>\n
PSRR<\/td>\n70dB @ 1kHz<\/td>\n<\/tr>\n
Output Noise<\/td>\n30uVRMS with 10nF bypass<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40 to 125 C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Ultra-low dropout voltage<\/li>\n
  • Low quiescent current of 71uA<\/li>\n
  • High PSRR: 70dB at 1kHz<\/li>\n
  • Internal soft-start mechanism<\/li>\n
  • Overcurrent and overtemperature protection<\/li>\n
  • Stable with 2.2uF ceramic capacitors<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Battery-powered portable devices<\/li>\n
    • Low-voltage microcontroller power<\/li>\n
    • Post-regulation for DC\/DC converters<\/li>\n
    • Consumer electronics<\/li>\n
    • Industrial control systems<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LP2985-33DBVR is a 150mA low-noise, low-dropout voltage regulator from Texas Instruments, featuring a fixed 3.3V output in a compact SOT-23-5 package. With an input voltage range of 2.5V to 16V and ultra-low quiescent current, it is ideal for battery-powered and portable applications. Key Specifications Output Voltage 3.3V Fixed Output Current 150mA Input […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,32],"tags":[],"chip_brand":[138],"class_list":["post-3678","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-ti"],"acf":{"brief_explanation":"150mA LDO, 3.3V fixed output, 280mV dropout, low noise, SOT-23-5","date_code":"","package_case":"SOT-23-5 (2.9 x 1.6 x 1.1 mm)","in_stock":2867,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lp2985.pdf","price":"$0.398 @ 1ku","product_introduction":"The LP2985-33DBVR from Texas Instruments is a fixed-output, wide-input, low-noise, low-dropout voltage regulator designed for portable and battery-powered applications. It supports an input voltage range from 2.5V to 16V and delivers up to 150mA of load current with a fixed 3.3V output. The device features ultra-low quiescent current of 71uA, making it suitable for always-on battery systems. With a high PSRR of 70dB at 1kHz and low output noise of 30uVRMS, it effectively attenuates switching ripple from upstream DC\/DC converters. The internal soft-start mechanism reduces inrush current during startup. Standard protection features include overcurrent and overtemperature shutdown. The LP2985-33DBVR is available in a 5-pin SOT-23 package and is stable with 2.2uF ceramic output capacitors.","working_principle":"The LP2985-33DBVR operates as a linear voltage regulator using a pass transistor controlled by an error amplifier. The error amplifier compares a fraction of the output voltage with an internal precision reference and adjusts the pass transistor gate to maintain a constant 3.3V output. Key subsystems include: (1) Voltage Reference - an internal bandgap reference provides the stable reference voltage; (2) Error Amplifier - amplifies the difference between the feedback voltage and the reference to drive the pass element; (3) Pass Transistor - a P-channel MOSFET that regulates the output by controlling current flow from input to output; (4) Protection Circuitry - includes current limiting and thermal shutdown to protect the device under fault conditions. The low dropout is achieved by using a P-channel MOSFET pass element, which requires minimal headroom between input and output.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>VIN<\/td>Input<\/td>Input voltage supply<\/td><\/tr>
      2<\/td>GND<\/td>Ground<\/td>Ground connection<\/td><\/tr>
      3<\/td>EN<\/td>Input<\/td>Enable input (active high)<\/td><\/tr>
      4<\/td>BYPASS<\/td>Input<\/td>External bypass capacitor for noise reduction<\/td><\/tr>
      5<\/td>VOUT<\/td>Output<\/td>Regulated 3.3V output<\/td><\/tr><\/table>","application_scenarios":"
      • Portable and battery-powered electronics requiring stable 3.3V rail<\/li>
      • Post-regulation after DC\/DC converters for noise-sensitive loads<\/li>
      • MCU and processor power supply in IoT devices<\/li>
      • Automotive infotainment and navigation systems<\/li>
      • Industrial sensor and control modules<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        Texas Instruments<\/td>TLV1117-33<\/td>SOT-223<\/td>800mA, higher current LDO<\/td><\/tr>
        Microchip<\/td>MIC5205-3.3<\/td>SOT-23-5<\/td>150mA, pin-compatible<\/td><\/tr>
        Diodes Inc<\/td>AP2112K-3.3<\/td>SOT-23-5<\/td>600mA, low dropout<\/td><\/tr>
        ON Semiconductor<\/td>NCP551SN33<\/td>SOT-23-5<\/td>150mA, low Iq<\/td><\/tr>
        Richtek<\/td>RT9013-33GB<\/td>SOT-23-5<\/td>300mA, low noise<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/3678","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=3678"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/3678\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=3678"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=3678"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=3678"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=3678"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}