1 Features
1• Input Voltage: 1.9 V to 5.2 V
• Operation From a Low Input Voltage: 1.9 V
• Accurate Output Voltage: 1.5 V ± 0.09 V
• Quiescent Current in Shutdown: < 1.5 μA
• Stable With an Output Capacitor: 1 μF
• Ensured Output Current: 30 mA
• Low Output Voltage Noise: 300 μVRMS short•
Low Quiescent Current: 29-μA Typical
• Stable With a Ceramic Capacitor space•
Logic Controlled Enable
• Fast Turnon and Turnoff
• Thermal-Overload and Short-Circuit Protection
• –40°C to +125°C Junction Temperature Range

2 Applications
• GSM Portable Phones
• CDMA Cellular Handsets
• Wideband CDMA Cellular Handsets
• Bluetooth Devices
• Portable Information Appliances

3 Description
The LP3992 regulator is designed to meet the
requirements of portable, battery-powered systems providing an accurate output voltage, low noise, and
low quiescent current. Battery life is prolonged by the
ability of the LP3992 to provide a 1.5-V output from
the low input voltage of 1.9 V. Additionally, when switched to a shutdown mode via a logic signal at the
enable (EN) pin, the power consumption is reduced
to virtually zero. The LP3992 also features short•
circuit and thermal-shutdown protection.
The LP3992 is designed to be stable with space•
saving ceramic capacitors as small as 1 μF.
Performance is specified for a –40°C to +125°C
temperature range.
For output voltages other than 1.5 V, and for
additional package options, contact TI.