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.