{"id":10587,"date":"2026-07-20T06:38:18","date_gmt":"2026-07-20T06:38:18","guid":{"rendered":"https:\/\/ic-vendor.com\/ld2980cm18tr\/"},"modified":"2026-07-20T06:38:18","modified_gmt":"2026-07-20T06:38:18","slug":"ld2980cm18tr","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/zh\/ld2980cm18tr\/","title":{"rendered":"LD2980CM18TR"},"content":{"rendered":"

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

The LD2980CM18TR from STMicroelectronics is a very low drop voltage regulator with a fixed 1.8V output, capable of supplying up to 100 mA output current. The device features an ultra-low dropout of 150 mV (typical at full load) and a quiescent current of just 1.2 mA. It is housed in a compact SOT23-5L package and includes short-circuit and thermal protection.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n
Output Voltage<\/td>\n1.8V (fixed)<\/td>\n<\/tr>\n
Maximum Output Current<\/td>\n100 mA<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n150 mV (typical at 100 mA)<\/td>\n<\/tr>\n
\u9759\u6001\u7535\u6d41<\/td>\n1.2 mA (typical)<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n2.0V to 16V<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOT23-5L<\/td>\n<\/tr>\n
Packing<\/td>\nTape & Reel<\/td>\n<\/tr>\n
Line Regulation<\/td>\n0.01%\/V (typical)<\/td>\n<\/tr>\n
Load Regulation<\/td>\n0.002%\/mA (typical)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Ultra-low dropout voltage: 150 mV at 100 mA<\/li>\n
  • Fixed 1.8V output with \u00b12% accuracy<\/li>\n
  • Very low quiescent current: 1.2 mA<\/li>\n
  • Internal short-circuit current limiting<\/li>\n
  • Thermal shutdown protection<\/li>\n
  • Compatible with low ESR ceramic output capacitors<\/li>\n
  • Available in SOT23-5L miniature package<\/li>\n
  • No bypass capacitor required<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Battery-powered portable devices<\/li>\n
    • Post-regulation in switching power supplies<\/li>\n
    • Mobile phone and PDA power management<\/li>\n
    • Wireless communication modules<\/li>\n
    • Low-noise analog circuit supply<\/li>\n
    • IoT sensor node power<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LD2980CM18TR from STMicroelectronics is a very low drop voltage regulator with a fixed 1.8V output, capable of supplying up to 100 mA output current. The device features an ultra-low dropout of 150 mV (typical at full load) and a quiescent current of just 1.2 mA. It is housed in a compact SOT23-5L […]<\/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":[31,13],"tags":[1925],"chip_brand":[142],"class_list":["post-10587","post","type-post","status-publish","format-standard","hentry","category-dc-dc-converters","category-integrated-circuits-ics","tag-ld2980cm18tr","chip_brand-st"],"acf":{"brief_explanation":"Low-dropout regulator, fixed 1.8V, 100mA, 150mV dropout, SOT23-5L","date_code":"","package_case":"SOT23-5L (2.9 x 2.8 x 1.3 mm)","in_stock":8743,"datasheet":"https:\/\/www.st.com\/resource\/en\/datasheet\/ld2980.pdf","price":"$0.34 @ 1ku","product_introduction":"The LD2980CM18TR is a very low dropout voltage regulator from STMicroelectronics, providing a fixed 1.8V output at up to 100 mA. With a typical dropout voltage of only 150 mV at full load, the device is ideal for battery-powered applications where maximizing battery life is critical. The regulator accepts input voltages from 2.0V to 16V and features a low quiescent current of 1.2 mA. The LD2980 family is available in multiple fixed output voltage options and uses a standard SOT23-5L package. The CM18TR suffix indicates the 1.8V output version in tape and reel packaging. The device includes built-in short-circuit current limiting and thermal shutdown protection for reliable operation under fault conditions. It is compatible with low ESR ceramic output capacitors, simplifying PCB design and reducing component count.","working_principle":"The LD2980 operates through three key subsystems:\n\n1. Voltage Reference and Error Amplifier: An internal bandgap voltage reference generates a stable 1.23V reference. A transconductance error amplifier compares the divided output voltage (via internal resistor divider for fixed versions) with the reference and adjusts the pass transistor drive to maintain regulation.\n\n2. Pass Element: A PNP bipolar pass transistor provides the low dropout characteristic. Unlike NPN-based LDOs, the PNP configuration allows the input-to-output voltage differential to be as low as the saturation voltage of the transistor (150 mV typical), enabling operation from input voltages very close to the output.\n\n3. Protection Circuits: An internal current limit circuit protects against output short circuits by limiting the pass transistor drive current. A thermal shutdown circuit disables the regulator when the junction temperature exceeds approximately 150\u00b0C, re-enabling it once the temperature drops below the hysteresis threshold. The device is stable with ceramic output capacitors of 2.2 \u00b5F or greater.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>IN<\/td>Power<\/td>Input voltage (2.0\u201316V)<\/td><\/tr>
      2<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      3<\/td>EN<\/td>Input<\/td>Enable (active high; tie to IN if unused)<\/td><\/tr>
      4<\/td>BYP<\/td>I\/O<\/td>Bypass capacitor for noise reduction (optional; leave open if unused)<\/td><\/tr>
      5<\/td>OUT<\/td>Power<\/td>Regulated 1.8V output<\/td><\/tr><\/table>","application_scenarios":"
      • Battery-powered devices: 150 mV dropout enables operation from a single Li-ion cell (3.0V end-of-life) down to 1.8V output with 100 mA load capability<\/li>
      • Post-regulation in switchers: Low quiescent current (1.2 mA) and low noise make it ideal as a secondary regulator after a switching converter for noise-sensitive analog circuits<\/li>
      • Portable electronics: SOT23-5L package minimizes PCB footprint in mobile phones, PDAs, and wearable devices requiring 1.8V logic supply<\/li>
      • IoT sensor nodes: Enable pin allows microcontroller-controlled power gating for battery conservation in duty-cycled wireless sensor applications<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        STMicroelectronics<\/td>LD2980CM33TR<\/td>SOT23-5L<\/td>3.3V output version<\/td><\/tr>
        STMicroelectronics<\/td>LD2980CM25TR<\/td>SOT23-5L<\/td>2.5V output version<\/td><\/tr>
        Texas Instruments<\/td>TLV70018DQNT<\/td>X2SON-4<\/td>1.8V, 200mA, smaller package<\/td><\/tr>
        onsemi<\/td>NCP511SN18T1G<\/td>TSOP-5<\/td>1.8V, 80mA, low noise<\/td><\/tr>
        Microchip<\/td>MCP1824S-1802E\/DB<\/td>SOT223-3<\/td>1.8V, 300mA, higher current<\/td><\/tr>
        Richtek<\/td>RT9193-18GB<\/td>SOT23-5<\/td>1.8V, 300mA, low noise<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/comments?post=10587"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10587\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/media?parent=10587"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/categories?post=10587"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/tags?post=10587"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=10587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}