1 Features

• 1-A Low-Dropout Regulator With Enable
• Available in Fixed and Adjustable (1.2 V to 5.5 V) Versions
• High PSRR (53 dB at 10 kHz)
• Ultralow-Noise (40 μV_RMS, TPS79630)
• Fast Start-Up Time (50 μs)
• Stable With a 1-μF Ceramic Capacitor
• Excellent Load and Line Transient Response
• Very Low Dropout Voltage (250 mV at Full Load, TPS79630)
• 3 × 3 VSON PowerPAD™, SOT223-6, and
  TO-263 Packages

2 Applications

• RF: VCOs, Receivers, ADCs
• Audio
• Bluetooth®, Wireless LAN
• Cellular and Cordless Telephones
• Handheld Organizers, PDAs

3 Description

The TPS796 family of low-dropout (LDO) low-power linear voltage regulators features high power-supply rejection ratio (PSRR), ultralow-noise, fast start-up, and excellent line and load transient responses in small outline, 3 × 3 VSON, SOT223-6, and TO-263 packages. Each device in the family is stable with a small, 1-μF ceramic capacitor on the output. The family uses an advanced, proprietary BiCMOS fabrication process to yield extremely low dropout voltages (for example, 250 mV at 1 A). Each device achieves fast start-up times (approximately 50 μs with a 0.001-μF bypass capacitor) while consuming very low quiescent current (265 μA typical). Moreover, when the device is placed in standby mode, the supply current is reduced to less than 1 μA. The TPS79630 exhibits approximately 40 μV_RMS of output voltage noise at 3.0-V output, with a 0.1-μF bypass capacitor. Applications with analog components that are noise sensitive, such as portable RF electronics, benefit from the high PSRR, low noise features, and need fast response time.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Ripple Rejection vs Frequency
TPS79630

Output Spectral Noise Density vs Frequency
TPS79630