{"id":10630,"date":"2026-07-20T07:56:28","date_gmt":"2026-07-20T07:56:28","guid":{"rendered":"https:\/\/ic-vendor.com\/lp2981aim5-3-3-nopb\/"},"modified":"2026-07-20T07:56:28","modified_gmt":"2026-07-20T07:56:28","slug":"lp2981aim5-3-3-nopb","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/es\/lp2981aim5-3-3-nopb\/","title":{"rendered":"LP2981AIM5-3.3\/NOPB"},"content":{"rendered":"

Productos<\/h2>\n

The LP2981AIM5-3.3\/NOPB is a 3.3V fixed-output low-dropout (LDO) linear regulator from Texas Instruments. Featuring an ultra-low dropout voltage of 200 mV at 100 mA, low quiescent current of 65 uA, and SOT-23-5 package, this regulator is designed for battery-powered and noise-sensitive applications requiring a clean, stable 3.3V supply rail.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Series<\/td>\nLP2981<\/td>\n<\/tr>\n
Output Voltage<\/td>\n3.3V (fixed)<\/td>\n<\/tr>\n
Maximum Output Current<\/td>\n100 mA<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n200 mV at 100 mA (typical)<\/td>\n<\/tr>\n
Input Voltage Range<\/td>\n2.5V to 16V<\/td>\n<\/tr>\n
Corriente de reposo<\/td>\n65 uA (typical, no load)<\/td>\n<\/tr>\n
Shutdown Current<\/td>\n0.01 uA (typical)<\/td>\n<\/tr>\n
Output Noise<\/td>\n160 uVrms (300 Hz to 50 kHz)<\/td>\n<\/tr>\n
PSRR at 1 kHz<\/td>\n63 dB<\/td>\n<\/tr>\n
Output Accuracy<\/td>\n+\/-0.75% (A grade)<\/td>\n<\/tr>\n
Paquete<\/td>\nSOT-23-5 (DBV)<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40C to +125C (A grade)<\/td>\n<\/tr>\n
Enable Pin<\/td>\nYes (active high)<\/td>\n<\/tr>\n
Bypass Pin<\/td>\nYes (for noise reduction)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Ultra-low 200 mV dropout at 100 mA output<\/li>\n
  • Very low quiescent current of 65 uA extends battery life<\/li>\n
  • Near-zero shutdown current (0.01 uA) for power gating<\/li>\n
  • Integrated enable pin for ON\/OFF control<\/li>\n
  • Bypass pin for external noise reduction capacitor<\/li>\n
  • Low output noise ideal for RF and analog circuits<\/li>\n
  • Over-temperature and over-current protection<\/li>\n
  • SOT-23-5 footprint for compact designs<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Battery-powered portable instruments<\/li>\n
    • RF module power supply<\/li>\n
    • Microcontroller 3.3V rail regulation<\/li>\n
    • Sensor analog supply with low noise requirements<\/li>\n
    • USB peripheral power management<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LP2981AIM5-3.3\/NOPB is a 3.3V fixed-output low-dropout (LDO) linear regulator from Texas Instruments. Featuring an ultra-low dropout voltage of 200 mV at 100 mA, low quiescent current of 65 uA, and SOT-23-5 package, this regulator is designed for battery-powered and noise-sensitive applications requiring a clean, stable 3.3V supply rail. Key Specifications Series LP2981 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13],"tags":[1971],"chip_brand":[138],"class_list":["post-10630","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","tag-lp2981aim5-3-3-nopb","chip_brand-ti"],"acf":{"brief_explanation":"TI LDO regulator, 3.3V fixed, 100mA, 200mV dropout, SOT-23-5, -40 to 125C","date_code":"","package_case":"SOT-23-5 (DBV)","in_stock":14732,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lp2981.pdf","price":"$0.65 @ 1ku","product_introduction":"The Texas Instruments LP2981AIM5-3.3\/NOPB is a 3.3V fixed-output ultra-low-dropout (LDO) linear regulator optimized for battery-powered and noise-sensitive applications. With only 200 mV dropout at 100 mA output and 65 uA quiescent current, this regulator maximizes battery utilization while providing a clean 3.3V supply rail. The A-grade version supports the full -40C to +125C temperature range with +\/-0.75% output accuracy. The enable pin enables power gating, while the bypass pin allows an external noise-reduction capacitor for ultra-low output noise performance.","working_principle":"The LP2981AIM5-3.3\/NOPB uses a PNP pass transistor in a low-dropout configuration. Unlike NPN-based regulators that require the input voltage to exceed the output by at least 1.5-2V, the PNP pass element allows operation with only 200 mV of headroom. A bandgap reference provides a stable voltage reference, while an error amplifier compares a fraction of the output voltage (via internal resistor divider for fixed versions) with the reference and adjusts the pass transistor drive to maintain regulation. The bypass pin allows connecting an external capacitor to the reference node, forming a low-pass filter that reduces reference noise. The enable pin controls a bias circuit that can shut down the device to 0.01 uA, and over-current\/over-temperature protection ensures safe operation under fault conditions.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>OUT<\/td>Output<\/td>Regulated 3.3V output<\/td><\/tr>
      2<\/td>GND<\/td>Ground<\/td>Ground reference<\/td><\/tr>
      3<\/td>EN<\/td>Input<\/td>Enable (active high) - pull high to enable<\/td><\/tr>
      4<\/td>BYP<\/td>Input<\/td>Bypass - connect 0.01uF cap to GND for noise reduction<\/td><\/tr>
      5<\/td>IN<\/td>Input<\/td>Unregulated input supply (up to 16V)<\/td><\/tr><\/table>","application_scenarios":"
      • 3.3V MCU power rail from Li-ion battery (3.7-4.2V)<\/li>
      • RF module clean 3.3V supply from noisy 5V rail<\/li>
      • Sensor analog 3.3V reference supply<\/li>
      • USB peripheral LDO with enable power gating<\/li>
      • Portable medical device 3.3V regulation<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>TLV1117LV33DCYR<\/td>SOT-223<\/td>Higher current (800mA) LDO<\/td><\/tr>
        Microchip<\/td>MIC5219-3.3YM5<\/td>SOT-23-5<\/td>Comparable LDO, 150mA<\/td><\/tr>
        ADI\/Maxim<\/td>MAX8867EUK33+T<\/td>SOT-23-5<\/td>3.3V LDO, 150mA<\/td><\/tr>
        Richtek<\/td>RT9013-33GB<\/td>SOT-23-5<\/td>3.3V LDO, 300mA<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/posts\/10630","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/comments?post=10630"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/posts\/10630\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/media?parent=10630"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/categories?post=10630"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/tags?post=10630"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/es\/wp-json\/wp\/v2\/chip_brand?post=10630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}