1 Features

• 1.5-A Low-Dropout Regulator With Enable
• Available in Fixed and Adjustable (1.2 V to 5.5 V) Output Versions
• High PSRR (49 dB at 10 kHz)
• Ultralow Noise (48 μV_RMS, TPS78630)
• Fast Start-Up Time (50 μs)
• Stable With a 1-μF Ceramic Capacitor
• Excellent Load and Line Transient Response
• Very Low Dropout Voltage (390 mV at Full Load, TPS78630)
• 3 × 3 SON PowerPAD™, 6-Pin SOT223 and 5-Pin DDPAK Package

2 Applications

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

3 Description

The TPS786 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, SOT223-6 and DDPAK-5 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, 390 mV at 1.5 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 TPS78630 exhibits approximately 48 μV_RMS of output voltage at 3-V output noise 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 the fast response time.

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

Ripple Rejection vs Frequency

Output Spectral Noise Density vs
Frequency