1 Features

1? Input Voltage Range: 1.8 V to 5.5 V

? Output Voltage Range: 1.3 V to 3.7 V

? Excellent Line Transient Response: ±2 mV

(typical)

? Excellent PSRR: –60 dB at 1 kHz typical

? Low Quiescent Current of 29 μA typical

? Small SC70-5 and SOT-23-5 Packages

? Fast Turnon Time of 30 μs typ.

? Typical < 1 nA Quiescent Current in Shutdown

? Ensured 150-mA Output Current

? Logic Controlled Enable 0.4 V/0.9 V

? Good Load Transient Response of 50 mVpp

(typical)

? Thermal Overload and Short-Circuit Protection

? -40°C to 125°C Junction Temperature Range

2 Applications

General Purpose

3 Description

The LP5951 regulator is designed to meet the

requirements of portable battery-powered systems providing a regulated output voltage and low

quiescent current. When switched to shutdown mode

via a logic signal at the Enable (EN) pin, the power

consumption is reduced to virtually zero.

The LP5951 is designed to be stable with small 1-μF

ceramic capacitors. The device also features internal

protection against short-circuit currents and over- temperature conditions.

Performance is specified for a –40°C to 125°C

temperature range.

The device is available in fixed output voltages in the

range of 1.3 V to 3.7 V. For availability, please

contact your local TI sales office.