The TPS7A4001DGNR is a Texas Instruments -20V negative LDO with 1A output, 40dB PSRR at 1kHz, and 16uVrms noise. Ultra-low noise negative regulator for sensitive analog loads. Packaged in MSOP-8 PowerPAD, -40C to +125C.<\/p>\n
| \u0627\u0644\u0645\u062e\u0631\u062c\u0627\u062a<\/td>\n | -0.5V to -20V adjustable<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| Current<\/td>\n | 1 A<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| PSRRR<\/td>\n | 40 dB @ 1kHz<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| Noise<\/td>\n | 16 uVrms (10Hz-100kHz)<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| Dropout<\/td>\n | 200 mV @ 1A<\/td>\n<\/tr>\n | ||||||||||||||||||||||||||||||||||||||||||
| \u0627\u0644\u062d\u0632\u0645\u0629<\/td>\n | MSOP-8 PowerPAD<\/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 TPS7A4001DGNR is a Texas Instruments -20V negative LDO with 1A output, 40dB PSRR at 1kHz, and 16uVrms noise. Ultra-low noise negative regulator for sensitive analog loads. Packaged in MSOP-8 PowerPAD, -40C to +125C. Key Specifications Output -0.5V to -20V adjustable Current 1 A PSRR 40 dB @ 1kHz Noise 16 uVrms (10Hz-100kHz) […]<\/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":[575],"chip_brand":[138],"class_list":["post-8926","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","tag-tps7a4001dgnr","chip_brand-ti"],"acf":{"brief_explanation":"Negative LDO, -20V, 1A, 16uVrms, 40dB PSRR, MSOP-8","date_code":"","package_case":"8-Pin MSOP PowerPAD (3.0 x 3.0 x 1.0 mm)","in_stock":3100,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tps7a40.pdf","price":"$3.20 @ 1ku","product_introduction":"The TPS7A4001DGNR is a Texas Instruments 1A negative-voltage low-dropout regulator in an 8-pin MSOP PowerPAD package. The device regulates negative input voltages from -0.5V to -20V, making it the negative-rail complement to the TPS7A45 positive LDO. The 16uVrms output noise over 10Hz to 100kHz and 40dB PSRR at 1kHz make it ideal for cleaning switching DC-DC negative rail noise for precision op amps, ADCs, and DACs that require a clean negative supply. The 200mV dropout at 1A provides good efficiency with moderate headroom. The NR (noise reduction) pin accepts an external 0.01uF capacitor that filters the internal reference noise, achieving the 16uVrms specification. The adjustable output voltage is set by two external resistors from VOUT to FB to GND, with a -1V reference. An EN (enable) pin allows shutdown with 1uA IQ. The MSOP-8 PowerPAD package provides low thermal resistance for 1A operation at higher input-output differentials. The device is stable with ceramic output capacitors (2.2uF minimum). Packaged in MSOP-8 PowerPAD rated for -40C to +125C.","working_principle":"The TPS7A40 uses a PMOS pass transistor for low dropout on the negative rail. The error amplifier compares the FB pin voltage (derived from the output through the external resistor divider) with the -1V internal reference, driving the PMOS gate to maintain regulation. The NMOS architecture (similar to positive TPS7A45) provides low output noise and high PSRR inherent to the source-follower output topology. An internal charge pump generates the gate drive voltage required to fully enhance the PMOS pass transistor. The NR pin capacitor creates a low-pass filter that attenuates reference noise, achieving the 16uVrms output noise specification. When the EN pin is pulled low, the pass transistor is disabled and the output floats. Current limit and thermal shutdown protect the device during fault conditions. The device uses the negative rail as the reference domain, so all pin voltages are measured relative to the negative input supply.","pin_description":"
|