{"id":8057,"date":"2026-06-28T08:48:26","date_gmt":"2026-06-28T08:48:26","guid":{"rendered":"https:\/\/materialparts.com\/adm7170acpz-3-3-r7\/"},"modified":"2026-06-28T11:35:08","modified_gmt":"2026-06-28T11:35:08","slug":"adm7170acpz-3-3-r7","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/adm7170acpz-3-3-r7\/","title":{"rendered":"ADM7170ACPZ-3.3-R7"},"content":{"rendered":"<h2>ADM7170ACPZ-3.3-R7 Overview<\/h2>\n<p>The ADM7170ACPZ-3.3-R7 is a 500mA ultralow noise, high PSRR LDO regulator from Analog Devices with fixed 3.3V output, 94dB PSRR at 1kHz, only 3.8uV RMS output noise, in an LFCSP-8 package, suitable for FPGA and RF front-end power supply.<\/p>\n<h3>Key Features<\/h3>\n<ul>\n<li>Fixed output voltage: 3.3V<\/li>\n<li>Output current: 500mA<\/li>\n<li>Dropout: 200mV at 500mA<\/li>\n<li>PSRR: 94dB at 1kHz<\/li>\n<li>Output noise: 3.8uV RMS<\/li>\n<li>Supply voltage: 2.3V-6.5V<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>ADM7170ACPZ-3.3-R7 Overview The ADM7170ACPZ-3.3-R7 is a 500mA ultralow noise, high PSRR LDO regulator from Analog Devices with fixed 3.3V output, 94dB PSRR at 1kHz, only 3.8uV RMS output noise, in an LFCSP-8 package, suitable for FPGA and RF front-end power supply. Key Features Fixed output voltage: 3.3V Output current: 500mA Dropout: 200mV at 500mA PSRR: [&hellip;]<\/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-8057","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-adi"],"acf":{"brief_explanation":"500mA CMOS LDO, 3.3V fixed, 5uVrms noise, 42mV dropout","date_code":"","package_case":"LFCSP-8 (3.0 x 3.0 x 0.73 mm, w\/ EP)","in_stock":10300,"datasheet":"https:\/\/www.analog.com\/media\/en\/technical-documentation\/data-sheets\/ADM7170.pdf","price":"$1.87 @ 1ku","product_introduction":"The ADM7170ACPZ-3.3-R7 is a 500 mA, ultralow noise CMOS LDO from Analog Devices with a fixed 3.3 V output and an input range of 2.3 V to 6.5 V. It delivers 5 uVrms output noise (100 Hz to 100 kHz), 60 dB PSRR at 100 kHz, and an ultra-fast 1.5 us transient response. The 42 mV dropout voltage at full load enables efficient regulation from a 3.6 V Li-ion cell or 5 V rail. Housed in a 3 mm x 3 mm LFCSP-8, it requires only a 4.7 uF ceramic output capacitor for stable operation.","working_principle":"The ADM7170ACPZ-3.3-R7 utilizes a PMOS pass transistor with a high-gain, wide-bandwidth error amplifier to maintain output regulation. The amplifier compares the sensed output voltage (through the SENSE pin) with an internal bandgap reference trimmed to 3.3 V. Any deviation drives the PMOS gate to correct the output within 1.5 us for large load steps. The CMOS process ensures ground current remains at 0.7 mA (no-load) independent of output current. An internal soft-start circuit limits inrush current during power-up. The precision enable circuit features a 1.2 V threshold with 40 mV hysteresis, enabling deterministic power sequencing in multi-rail systems. Overcurrent protection folds back the output current, and thermal shutdown activates at approximately 150 degrees C junction temperature.","pin_description":"<table><tr><th>Pin<\/th><th>Name<\/th><th>Description<\/th><\/tr><tr><td>1<\/td><td>VOUT<\/td><td>Regulated 3.3 V output; connect 4.7 uF ceramic capacitor to GND<\/td><\/tr><tr><td>2<\/td><td>VOUT<\/td><td>Regulated output (duplicate for current capacity)<\/td><\/tr><tr><td>3<\/td><td>SENSE<\/td><td>Output voltage sense feedback; connect to load point<\/td><\/tr><tr><td>4<\/td><td>SS<\/td><td>Soft-start control; connect capacitor to GND for programmable ramp time<\/td><\/tr><tr><td>5<\/td><td>EN<\/td><td>Enable input; precision 1.2 V threshold for supply sequencing<\/td><\/tr><tr><td>6<\/td><td>GND<\/td><td>Ground reference<\/td><\/tr><tr><td>7<\/td><td>VIN<\/td><td>Input supply (2.3 V to 6.5 V)<\/td><\/tr><tr><td>8<\/td><td>VIN<\/td><td>Input supply (duplicate)<\/td><\/tr><tr><td>EP<\/td><td>GND<\/td><td>Exposed thermal pad; solder to PCB ground plane<\/td><\/tr><\/table>","application_scenarios":"<ul><li><strong>3.3 V Analog Rail<\/strong>: Clean supply for op-amps, comparators, and precision analog signal chains<\/li><li><strong>RF Front-End Supply<\/strong>: Low-noise power for LNA and mixer stages in wireless receivers<\/li><li><strong>PLL\/VCO Power<\/strong>: Ultra-low-noise rail for frequency synthesizers to minimize phase noise<\/li><li><strong>Portable Instrumentation<\/strong>: Battery-powered test equipment with demanding noise floor requirements<\/li><li><strong>Sensor Signal Conditioning<\/strong>: Low-noise bridge sensor excitation and ADC reference supply<\/li><\/ul>","alternative_models":"<table><tr><th>Model<\/th><th>Manufacturer<\/th><th>Vout<\/th><th>Iout<\/th><th>Noise<\/th><th>Package<\/th><\/tr><tr><td>ADM7170ACPZ-1.8-R7<\/td><td>Analog Devices<\/td><td>1.8 V<\/td><td>500 mA<\/td><td>5 uVrms<\/td><td>LFCSP-8<\/td><\/tr><tr><td>TPS7A4701<\/td><td>Texas Instruments<\/td><td>Adj<\/td><td>1 A<\/td><td>4 uVrms<\/td><td>VSON-10<\/td><\/tr><tr><td>LT3045<\/td><td>Analog Devices<\/td><td>Adj<\/td><td>500 mA<\/td><td>0.8 uVrms<\/td><td>DFN-12<\/td><\/tr><tr><td>NCP511<\/td><td>onsemi<\/td><td>3.3 V<\/td><td>300 mA<\/td><td>8 uVrms<\/td><td>DFN-6<\/td><\/tr><tr><td>MAX38912<\/td><td>Maxim<\/td><td>3.3 V<\/td><td>500 mA<\/td><td>7 uVrms<\/td><td>WLP-6<\/td><\/tr><\/table>\n<p>ADM7170ACPZ-3.3V-R7 is a 500mA ultralow noise CMOS LDO from Analog Devices with 5\u00b5Vrms noise, 60dB PSRR at 100kHz, and 1.5\u00b5s fast transient response in 3x3mm LFCSP-8. The family includes 1.8V, 3.3V, and 5.0V fixed-output variants with identical performance. For higher current, ADM7150 provides 800mA with 1.0\u00b5Vrms noise. For adjustable output, ADM7170ACPZ offers programmable voltage. The TPS7A7001 from TI is a competitive 1A low-noise LDO alternative.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/8057","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=8057"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/8057\/revisions"}],"predecessor-version":[{"id":8074,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/8057\/revisions\/8074"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=8057"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=8057"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=8057"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=8057"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}