1 Features

1• Input Voltage Range: 0.7 V to 4.5 V

• 2.5 V ≤ V BATT ≤ 5.5 V

• 0.5V ≤ VOUT ≤ 2 V

• Ensured 350-mA Output Current

• For ILOAD = 350 mA:

– VBATT ≥ VOUT(NOM) + 1.5 V or 2.5 V

(Whichever is Higher)

• For ILOAD = 150 mA:

– VBATT ≥ VOUT(NOM) + 1.3 V or 2.5 V

(Whichever is Higher)

• Excellent Load Transient Response: ±15 mV

Typical

• Excellent Line Transient Response: ±1 mV Typical

• 50-μA Typical Quiescent Current from VBATT

• 10-μA Typical Quiescent Current from VIN

• 0.1-μA Typical Quiescent Current in Shutdown

• Noise voltage = 100 μVRMS Typical

• Operates from a Single Li-Ion Cell or 3-Cell

NiMH/NiCd Battery

• Thermal-Overload and Short-Circuit Protection

2 Applications

• Mobile Phones

• Hand-Held Radios

• Personal Digital Assistants

• Palm-Top PCs

• Portable Instruments

• Battery-Powered Devices

3 Description

The LP5952 is a dual-supply-rail linear regulator

optimized for powering ultralow-voltage circuits from a

single Li-Ion cell or 3-cell NiMH/NiCd battery.

In the typical post-regulation application VBATT is

directly connected to the battery (range 2.5 V to

5.5 V), and VIN is supplied by the output voltage of

the DC-DC converter (range 0.7 V to 4.5 V).

The device offers superior dropout and transient

features combined with very low quiescent currents.

In shutdown mode (Enable (EN) pin pulled low) the

device turns off and reduces battery consumption to

0.1 μA (typical). The LP5952 also features internal

protection against overtemperature, overcurrent, and

undervoltage conditions.

Depending upon application, only one or two tiny

surface-mount external components are required;

performance is specified for a –40°C to +125°C

junction temperature range. The device is available in

fixed output voltages from 0.5 V to 2 V. For

availability, please contact your local Texas

Instruments sales office.