{"id":8360,"date":"2026-06-28T12:42:58","date_gmt":"2026-06-28T12:42:58","guid":{"rendered":"https:\/\/materialparts.com\/lt1764aeq-1-8trpbf\/"},"modified":"2026-06-28T12:42:58","modified_gmt":"2026-06-28T12:42:58","slug":"lt1764aeq-1-8trpbf","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/lt1764aeq-1-8trpbf\/","title":{"rendered":"LT1764AEQ-1.8#TRPBF"},"content":{"rendered":"

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

The LT1764AEQ-1.8#TRPBF from Analog Devices is a 3 A, low-noise LDO regulator with a fixed 1.8 V output in a 5-lead DD-Pak (TO-263) package. It features 40 \u00b5Vrms output noise (10 Hz to 100 kHz), 1.8 V dropout at 3 A, and wide 2.7 V to 20 V input range, making it ideal for noise-sensitive RF and precision analog circuits.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Output Voltage<\/td>\n1.8 V (fixed)<\/td>\n<\/tr>\n
\u8f93\u51fa\u7535\u6d41<\/td>\n3 A<\/td>\n<\/tr>\n
Dropout Voltage<\/td>\n1.8 V max @ 3 A<\/td>\n<\/tr>\n
Output Noise<\/td>\n40 \u00b5Vrms (10 Hz to 100 kHz)<\/td>\n<\/tr>\n
\u8f93\u5165\u7535\u538b\u8303\u56f4<\/td>\n2.7 V to 20 V<\/td>\n<\/tr>\n
PSRR<\/td>\n>60 dB at 1 kHz<\/td>\n<\/tr>\n
Line Regulation<\/td>\n0.04%\/V<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nDD-Pak (TO-263-5)<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Ultra-low 40 \u00b5Vrms output noise for RF and precision analog<\/li>\n
  • 1.8 V maximum dropout at full 3 A load<\/li>\n
  • Fixed 1.8 V output with 1% initial accuracy<\/li>\n
  • External bypass capacitor reduces noise to below 10 \u00b5Vrms<\/li>\n
  • No protection diodes required for output voltages to 20 V<\/li>\n
  • Shutdown pin with 0.5 \u00b5A standby current<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • RF and wireless power supplies<\/li>\n
    • PLL and VCO clean supply rails<\/li>\n
    • High-speed ADC\/DAC reference supplies<\/li>\n
    • Low-noise instrumentation amplifiers<\/li>\n
    • Post-regulation for switching converters<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The LT1764AEQ-1.8#TRPBF from Analog Devices is a 3 A, low-noise LDO regulator with a fixed 1.8 V output in a 5-lead DD-Pak (TO-263) package. It features 40 \u00b5Vrms output noise (10 Hz to 100 kHz), 1.8 V dropout at 3 A, and wide 2.7 V to 20 V input range, making it ideal […]<\/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":[13,32],"tags":[],"chip_brand":[165],"class_list":["post-8360","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-adi"],"acf":{"brief_explanation":"3A LDO, 1.8V fixed, 40uVrms noise, 1.8V dropout, DD-Pak, low-noise RF supply","date_code":"","package_case":"DD-Pak \/ TO-263-5 (10.30 x 9.10 x 4.50 mm)","in_stock":11369,"datasheet":"https:\/\/www.analog.com\/media\/en\/technical-documentation\/data-sheets\/1764sff.pdf","price":"$4.80 @ 1ku","product_introduction":"The LT1764AEQ-1.8#TRPBF from Analog Devices is a 3 A low-dropout (LDO) linear regulator with a fixed 1.8 V output, specifically designed for ultra-low-noise applications. The device delivers only 40 \u00b5Vrms output noise over the 10 Hz to 100 kHz bandwidth, making it ideal for powering RF power amplifiers, PLLs, VCOs, high-speed data converters, and other noise-sensitive circuits. The LDO architecture achieves a maximum dropout voltage of 1.8 V at the full 3 A load, allowing operation from supplies as low as 3.6 V. An optional external bypass capacitor on the NR\/ADJ pin can reduce output noise to below 10 \u00b5Vrms. The input range extends to 20 V, and no protection diodes are required even with output voltages up to 20 V. The shutdown pin reduces supply current to 0.5 \u00b5A, and the DD-Pak (TO-263-5) package provides excellent thermal dissipation for surface-mount assembly.","working_principle":"The LT1764AEQ-1.8 operates as a series-pass linear regulator using a PNP pass transistor in a low-dropout configuration. Unlike NPN-pass LDOs that require the input voltage to exceed the output by at least one VBE plus VCESAT (typically 1.5-2 V), the PNP pass transistor allows dropout as low as the VCESAT of the transistor (1.8 V at 3 A). The error amplifier compares a divided version of the output voltage against a precision internal bandgap reference and drives the PNP pass transistor to maintain regulation. The ultra-low noise is achieved through a carefully designed bandgap reference with a dedicated NR (noise reduction) pin. Connecting an external capacitor from NR to GND creates a low-pass filter that attenuates reference noise, reducing total output noise from 40 \u00b5Vrms to below 10 \u00b5Vrms. The high PSRR (>60 dB at 1 kHz) rejects input supply ripple, making the device effective as a post-regulator after switching converters.","pin_description":"
      Pin<\/th>Name<\/th>Function<\/th><\/tr>
      1<\/td>OUT<\/td>Regulated 1.8 V output<\/td><\/tr>
      2<\/td>GND<\/td>Ground connection and thermal pad<\/td><\/tr>
      3<\/td>EN\/SHDN<\/td>Enable \/ shutdown control (high = enabled, low = shutdown)<\/td><\/tr>
      4<\/td>NR<\/td>Noise reduction bypass capacitor connection (optional)<\/td><\/tr>
      5<\/td>IN<\/td>Input supply (2.7 V to 20 V)<\/td><\/tr><\/table>","application_scenarios":"
      • RF Power Amplifier Supply<\/strong>: Clean 1.8 V rail for cellular and Wi-Fi RF PA modules requiring ultra-low noise<\/li>
      • PLL\/VCO Power<\/strong>: Low-noise supply for phase-locked loops and voltage-controlled oscillators in frequency synthesizers<\/li>
      • High-Speed ADC Reference<\/strong>: Precision 1.8 V reference supply for 14-16 bit data converters<\/li>
      • Post-Regulation<\/strong>: Clean-up LDO after switching converter in mixed-signal systems<\/li>
      • Instrumentation<\/strong>: Low-noise supply for precision op-amps and instrumentation amplifiers<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>VOUT<\/th>IOUT<\/th>Noise<\/th>Package<\/th>Notes<\/th><\/tr>
        LT1764AEQ-2.5#TRPBF<\/td>Analog Devices<\/td>2.5 V<\/td>3 A<\/td>40 \u00b5Vrms<\/td>DD-Pak<\/td>2.5 V fixed variant<\/td><\/tr>
        LT1764AEQ-3.3#TRPBF<\/td>Analog Devices<\/td>3.3 V<\/td>3 A<\/td>40 \u00b5Vrms<\/td>DD-Pak<\/td>3.3 V fixed variant<\/td><\/tr>
        TPS7A7001DDCR<\/td>Texas Instruments<\/td>Adj<\/td>3 A<\/td>17 \u00b5Vrms<\/td>SON-8<\/td>Lower noise, adjustable<\/td><\/tr>
        LT3045EDD#PBF<\/td>Analog Devices<\/td>Adj<\/td>0.5 A<\/td>0.8 \u00b5Vrms<\/td>DFN-10<\/td>Ultra-low noise, lower Iout<\/td><\/tr>
        ADP1761ACPZ<\/td>Analog Devices<\/td>Adj<\/td>1 A<\/td>1.3 \u00b5Vrms<\/td>LFCSP-8<\/td>Ultra-low noise, LFCSP<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/8360","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=8360"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/8360\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=8360"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=8360"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=8360"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=8360"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}