1 Features
1• Input Voltage Range: 2.5 V to 6 V
• Output Current: 150 mA
• PSRR at 10 kHz: 40 dB
• Quiescent Current When Shut Down: ≤ 1μA
• Fast Turnon Time: 100 μs (Typical)
• Dropout With 150-mA load: 80 mV (Typical)
• Junction Temperature Range for Operation:
−40°C to +125°C
• Power-Good Flag Output
• Logic Controlled Enable
• Thermal Shutdown and Short-Circuit Current Limit
• Stable with Ceramic and High-Quality Tantalum
Capacitors

2 Applications
• CDMA Cellular Handsets
• Wideband CDMA Cellular Handsets
• GSM Cellular Handsets
• Portable Information Appliances
• Tiny 3.3 V ± 5% to 2.85 V, 150-mA Converter

3 Description
The LP3988 is a 150-mA low dropout regulator
designed specially to meet requirements of portable battery applications. The LP3988 is designed to work
with space-saving, small 1-μF ceramic capacitors.
The LP3988 features a Power Good (PG) output that
indicates a faulty output condition. The device is ideal for mobile phone and similar battery-powered
wireless applications. It provides up to 150 mA output
current from a 2.5-V to 6-V input, consuming less
than 1 μA in disable mode and has fast turnon time
less than 200 μs.
The LP3988 device's performance is optimized for
battery-powered systems to deliver low noise, extremely low dropout voltage, and low quiescent
current. Regulator ground current increases only
slightly in dropout, further prolonging the battery life.
Power supply rejection is better than 60 dB at low frequencies and starts to roll off at 10 kHz. High
power-supply rejection is maintained down to lower
input-voltage levels common to battery-operated
circuits.
The LP3988 is available in a 5-pin SOT-23 package
and a 5-pin thin DSBGA package. Performance is specified for −40°C to +125°C temperature range. For
all available output voltage and package options, see
the Package Option Addendum (POA) at the end of
the data sheet.