TPS79501-Q1

TPS79501-Q1 www.ti.com ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 500-mA LOW-DROPOUT LINEAR REGULATORS Check for Samples: TPS79501-Q1 SLVSAJ9 – SEPTEMBER 2010 FEATURES 1 2 Qualified for Automotive Applications 500-mA Low-Dropout Regulator With Enable High PSRR (50 dB at 10 kHz) Ultralow Noise (33 mVRMS, TPS79501-Q1) Fast Start-Up Time (50 ms) Stable With a 1-mF Ceramic Capacitor Excellent Load/Line Transient Response Low Dropout Voltage (110 mV at Full Load, TPS79501-Q1) APPLICATIONS RF: VCOs, Receivers, ADCs Audio Bluetooth®, Wireless LAN DESCRIPTION The TPS79501-Q1 low-dropout (LDO), low-power linear voltage regulator features high power-supply rejection ratio (PSRR), ultralow noise, fast start-up, and excellent line and load transient responses in a small outline SON package. The device is stable with a small 1-mF ceramic capacitor on the output. The TPS79501-Q1 uses an advanced, proprietary BiCMOS fabrication process to yield extremely low dropout voltages (for example, 110 mV at 500 mA). The device achieves fast start-up times (approximately 50 ms with a 0.001-mF bypass capacitor) while consuming very low quiescent current (265 mA, typical). Moreover, when the device is placed in standby mode, the supply current is reduced to less than 1 mA. The TPS79501-Q1 exhibits approximately 33 mVRMS of output voltage noise at 3-V output with a 0.1-mF bypass capacitor. Applications with analog components that are noise-sensitive, such as portable RF electronics, ...