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TPS79425DGNR Fiches technique(PDF) 1 Page - Texas Instruments |
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TPS79425DGNR Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 23 page www.ti.com FEATURES DESCRIPTION APPLICATIONS EN OUT NC − No internal connection 1 2 3 4 5 DCQ PACKAGE NR/FB OUT GND IN EN 2 1 3 4 7 8 6 5 NC FB NR IN NC GND SOT223-6 (TOP VIEW) DGN PACKAGE MSOP-8 PowerPADt (TOP VIEW) IOUT = 10 mA IOUT = 250 mA VIN = 4.3 V, VOUT = 3.3 V, CIN = 1 µF, COUT = 10 µF, CNR = 0.01 µF 40 20 10 10 100 1 k 10 k 60 70 Frequency (Hz) TPS79433 RIPPLE REJECTION vs FREQUENCY 90 100 k 1 M 10 M 0 30 50 80 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 IOUT = 250 mA IOUT = 1 mA COUT = 2.2 µF, CNR = 0.1 µF, VIN = 3.8 V TPS79428 OUTPUT SPECTRAL NOISE DENSITY vs FREQUENCY Frequency (Hz) 100 1000 10000 100000 6 GND TPS794xx SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005 ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 250-mA LOW-DROPOUT LINEAR REGULATORS • 250-mA Low-Dropout Regulator With Enable The TPS794xx family of low-dropout (LDO) linear voltage regulators features high power-supply • Available in Fixed and Adjustable (1.2 V to rejection ratio (PSRR), ultralow-noise, fast start-up, 5.5 V) Versions and excellent line and load transient responses in • High PSRR (60 dB at 10 kHz) small outline, MSOP-8 PowerPAD™ and SOT223-6 • Ultralow Noise (32 µVrms, TPS79428) packages. Each device in the family is stable with a small 2.2- µF ceramic capacitor on the output. The • Fast Start-Up Time (50 µs) family uses an advanced, proprietary BiCMOS • Stable With a 2.2-µF Ceramic Capacitor fabrication process to yield extremely low dropout • Excellent Load/Line Transient Response voltages (for example, 155 mV at 250 mA). Each device achieves fast start-up times (approximately • Very Low Dropout Voltage (155 mV at Full 50 µs with a 0.001-µF bypass capacitor) while Load) consuming low quiescent current (170 µA typical). • Available in MSOP-8 and SOT223-6 Packages Moreover, when the device is placed in standby mode, the supply current is reduced to less than 1 µA. The TPS79428 exhibits approximately • RF: VCOs, Receivers, ADCs 32 µV RMS of output voltage noise at 2.8 V output with a 0.1- µF bypass capacitor. Applications with analog • Audio components that are noise-sensitive, such as • Bluetooth™, Wireless LAN portable RF electronics, benefit from the high PSRR • Cellular and Cordless Telephones and low noise features as well as the fast response • Handheld Organizers, PDAs time. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PowerPAD is a trademark of Texas Instruments. Bluetooth is a trademark of Bluetooth SIG, Inc. All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2001–2005, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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