1FEATURES
2• 5 pin DSBGA Package
• Stable with Ceramic Capacitor
• Logic Controlled Enable
• Fast Turn-on
• Thermal-overload and short-circuit protection
• −40 to +125°C junction temperature range for
operation

KEY SPECIFICATIONS
• 2.5V to 6.0V Input Range
• Accurate Output Voltage; ±75mV / 2%
• 60 mV Typical Dropout with 150 mA Load. Vout
> 2.5V
• Virtually Zero Quiescent Current when
Disabled
• 10 μVrms Output Noise Over 10Hz to 100kHz
• Stable with a 1 μF Output Capacitor
• Ensured 150 mA Output Current
• Fast Turn-on Time; 140 μs (Typ.)

APPLICATIONS
• GSM Portable Phones
• CDMA Cellular Handsets
• Wideband CDMA Cellular Handsets
• Bluetooth Devices
• Portable Information Appliances
• Handheld MP3 Devices

DESCRIPTION
The LP3999 regulator is designed to meet the
requirements of portable wireless battery-powered
applications and will provide an accurate output
voltage with low noise and low quiescent current.
Ideally suited for powering RF/Analog devices this
device will also be used to meet more general circuit
requirements.
For battery powered applications the low dropout and
low ground current provided by the device allows the
lifetime of the battery to be maximized.The inclusion of an Enable(disable) control can be used by the
system to further extend the battery lifetime by
reducing the power consumption to virtually zero.
Should the application require a device with an active
disable function please refer to device LP3995.
The LP3999 also features internal protection against
short-circuit currents and over-temperature
conditions.