1 Features
1• Input Voltage Range, 2.5 V to 5.5 V
• Output Voltage Range, 1.5 V to 4.5 V
• Stable with 0.47-μF Ceramic Input and Output
Capacitors
• No Noise Bypass Capacitor Required
• Logic Controlled Enable
• Thermal-Overload and Short-Circuit Protection
• −40°C to 125°C Junction Temperature Range for
Operation
• Output Current, 150 mA
• Low Output Voltage Noise, 6.5 μVRMS
• PSRR, 75 dB at 1 kHz
• Output Voltage Tolerance, ±2%
• Virturally Zero IQ (Disabled), < 1 μA
• Very Low IQ (Enabled), 25 μA
• Start-up Time, 150 μs
• Low Dropout, 80 mV Typ.

2 Applications
• Cellular Phones
• PDA Handsets
• Wireless LAN Devices

3 Description
The LP5900 is an LDO capable of supplying 150-mA
output current. Designed to meet the requirements of
RF and analog circuits, the LP5900 device provides
low noise, high PSRR, low quiescent current, and low
line transient response figures. Using new innovative
design techniques the LP5900 offers class-leading
device noise performance without a noise bypass
capacitor.
The device is designed to work with 0.47-μF input
and output ceramic capacitors (no bypass capacitor
required).
The device is available in a DSBGA (YZR) package
and a WSON package; the device is also available in
an extremely thin DSBGA (YPF) package. For all
voltage and package options available today, see the
Package Option Addendum (POA) at the end of this
data sheet. For any other fixed output voltages from
1.5 V to 4.5 V in 25-mV steps and all other package
options, contact your local TI Sales office.