The TPS7A4501DCQR is a Texas Instruments 1.5 A, 20 V low-noise fast-transient-response LDO voltage regulator with adjustable output from 1.21 V to 20 V. It features 300 mV dropout, 35 \u00b5VRMS output noise, 68 dB PSRR at 1 kHz, reverse current protection, and is packaged in a 6-pin SOT-223 rated for -40\u00b0C to +125\u00b0C.<\/p>\n
| \u062a\u064a\u0627\u0631 \u0627\u0644\u0625\u062e\u0631\u0627\u062c<\/td>\n | 1.5 A<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||
| \u062c\u0647\u062f \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/td>\n | Up to 20 V<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||
| Output Range<\/td>\n | 1.21 V to 20 V (adjustable)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||
| \u062c\u0647\u062f \u0627\u0644\u062a\u0633\u0631\u0628<\/td>\n | 300 mV at 1.5 A<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||
| \u0636\u0648\u0636\u0627\u0621 \u0627\u0644\u0625\u062e\u0631\u0627\u062c<\/td>\n | 35 \u00b5VRMS (10 Hz-100 kHz)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||
| PSRRR<\/td>\n | 68 dB at 1 kHz<\/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 1.5 A, 20 V low-noise fast-transient-response LDO voltage regulator with adjustable output from 1.21 V to 20 V. It features 300 mV dropout, 35 \u00b5VRMS output noise, 68 dB PSRR at 1 kHz, reverse current protection, and is packaged in a 6-pin SOT-223 rated for -40\u00b0C to […]<\/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":[138],"class_list":["post-8731","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-ti"],"acf":{"brief_explanation":"1.5A adjustable LDO, 1.21-20V output, 300mV dropout, 35uVrms noise, SOT-223-6","date_code":"","package_case":"6-SOT-223 (6.50 x 7.06 mm)","in_stock":3500,"datasheet":"https:\/\/www.ti.com\/product\/TPS7A45","price":"$2.05 @ 1ku","product_introduction":"The Texas Instruments TPS7A4501DCQR is a 1.5A low-dropout linear regulator with an adjustable output voltage from 1.21V to 20V and input voltage range up to 20V. The 300 mV dropout voltage at 1.5A full load makes it efficient for post-regulation from 12V or 19V bus rails, while the 35 uVrms output noise (10 Hz to 100 kHz) and 68 dB PSRR at 1 kHz make it ideal for noise-sensitive RF and precision analog circuits. The quiescent current is well-controlled at 1 mA and does not increase in dropout\u2014a common failure mode of other LDOs that can cause thermal runaway. In shutdown mode, quiescent current drops below 1 uA. The device is stable with just 10 uF of ceramic output capacitance (no ESR requirements), simplifying PCB layout. Internal protection includes reverse-battery protection, reverse current protection, current limiting, and thermal shutdown. The SOT-223-6 package with exposed tab provides good thermal performance for the 1.5A output current, with a theta-JA of approximately 31C\/W on a standard 4-layer PCB. The -40C to +125C operating range supports industrial and automotive applications.","working_principle":"The TPS7A4501 uses a PMOS pass transistor controlled by an error amplifier that compares a divided version of the output voltage with the internal 1.21V reference. The adjustable output is set by two external resistors: VOUT = 1.21V x (1 + R1\/R2) + IADJ x R1, where IADJ is the ADJ pin bias current (typically 0.5 uA). The fast transient response results from wide error amplifier bandwidth and low output impedance\u2014when a load step occurs, the error amplifier quickly adjusts the PMOS gate drive to maintain regulation. The low noise is achieved through careful reference design and the use of a noise-reduction capacitor on the ADJ pin (optional). Reverse current protection monitors the voltage differential between input and output\u2014if VOUT exceeds VIN by more than approximately 300 mV, an internal switch disconnects the output from the input, preventing current flow back to the source. This feature is critical in systems where multiple supply rails may power up and down at different times. The controlled quiescent current in dropout means the device does not draw excessive current when VIN-VOUT drops below the regulation threshold, preventing the thermal issues that plague conventional LDOs.","pin_description":"
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