The TPS7A4501DCQR is a Texas Instruments 1A 20V LDO with 35uVrms output noise, 63dB PSRR at 1kHz, and 200mV dropout. Designed for noise-sensitive RF and analog loads. Packaged in 6-pin SOT-89, -40C to +125C.<\/p>\n
| \u062a\u064a\u0627\u0631 \u0627\u0644\u0625\u062e\u0631\u0627\u062c<\/td>\n | 1 A<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||
| Input Range<\/td>\n | 3.0 V to 20 V<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||
| Noise<\/td>\n | 35 uVrms (10Hz-100kHz)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||
| PSRRR<\/td>\n | 63 dB @ 1kHz<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||
| Dropout<\/td>\n | 200 mV @ 1A<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||
| \u0627\u0644\u062d\u0632\u0645\u0629<\/td>\n | SOT-89-6<\/td>\n<\/tr>\n<\/table>\n\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n\u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\nProduct Overview The TPS7A4501DCQR is a Texas Instruments 1A 20V LDO with 35uVrms output noise, 63dB PSRR at 1kHz, and 200mV dropout. Designed for noise-sensitive RF and analog loads. Packaged in 6-pin SOT-89, -40C to +125C. Key Specifications Output Current 1 A Input Range 3.0 V to 20 V Noise 35 uVrms (10Hz-100kHz) PSRR 63 […]<\/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":[556],"chip_brand":[138],"class_list":["post-8907","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","tag-tps7a4501dcqr","chip_brand-ti"],"acf":{"brief_explanation":"1A LDO, 20V, 35uVrms noise, 63dB PSRR, SOT-89-6","date_code":"","package_case":"6-Pin SOT-89 (4.5 x 2.5 x 1.5 mm)","in_stock":4200,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tps7a45.pdf","price":"$2.50 @ 1ku","product_introduction":"The TPS7A4501DCQR is a Texas Instruments 1A low-noise LDO regulator in a 6-pin SOT-89 power package, designed for noise-sensitive RF, analog, and precision applications. The 35uVrms output noise over 10Hz to 100kHz and 63dB PSRR at 1kHz make it one of the best LDOs for cleaning switching DC-DC converter output noise for RF VCOs, PLLs, and high-resolution data converters. The 3.0V to 20V input range supports post-regulation from common 5V, 12V, and 15V DC-DC outputs. The 200mV dropout at 1A provides good efficiency with moderate headroom. The NR (noise reduction) pin accepts an external capacitor (typically 0.01uF) that filters the internal reference noise, achieving the 35uVrms specification. An EN (enable) pin allows shutdown to reduce supply current. The SOT-89-6 package with exposed thermal pad provides low thermal resistance (34C\/W typical) for 1A output at higher input-output differentials. The device is stable with ceramic output capacitors (2.2uF minimum). Packaged in SOT-89-6 rated for -40C to +125C.","working_principle":"The TPS7A45 uses an NMOS pass transistor architecture with an internal charge pump to generate the gate voltage above the output. The NMOS architecture provides several advantages: very low output noise (since the noise is not multiplied by the pass element gain), high PSRR (the NMOS source-follower topology inherently rejects input noise), and fast transient response (the low output impedance of the source follower). The internal bandgap reference provides the target voltage, with the NR pin capacitor creating a low-pass filter that attenuates reference noise below the error amplifier bandwidth. The error amplifier drives the NMOS gate to maintain regulation. The charge pump generates the gate voltage from the input supply, requiring VIN at least 1.4V above VOUT for proper charge pump operation. During dropout (VIN-VOUT less than 200mV at 1A), the charge pump cannot fully enhance the NMOS, and the output voltage drops below the target. Current limit and thermal shutdown protect the device during fault conditions.","pin_description":"
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