1 Features
1• Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40°C to
+125°C Ambient Operating Temperature
– Device HBM ESD Classification Level H2
– Device CDM ESD Classification Level C4B
• Operating Input Voltage 2.5 V to 6 V
• Power-Good Flag Output
• Logic-Controlled Enable
• Stable With Ceramic and High-Quality Tantalum
Capacitors
• Fast Turnon
• Thermal Shutdown and Short-Circuit Current Limit
• 5-Pin SOT-23 Package

2 Applications
• Automotive
• CDMA Cellular Handsets
• Wideband CDMA Cellular Handsets
• GSM Cellular Handsets
• Portable Information Appliances

3 Description
The LP3988-Q1 is a 150-mA low-dropout regulator
designed specially to meet requirements of portable
battery applications. The LP3988-Q1 works with a
space-saving 1-μF ceramic capacitor. The LP3988-
Q1 features an error flag-output that indicates a faulty
output condition.
The LP3988-Q1 has performance 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. The
device maintains high power-supply rejection down to
lower input voltage levels common to batteryoperated
circuits.
The device is ideal for mobile phone and similar
battery-powered wireless applications. It provides up
to 150 mA, 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-Q1 is available in a 5-pin SOT-23
package, has performance specified for the −40°C to
+125°C temperature range, and is available in a 2.85-
V output voltage. For other voltage options, contact TI
sales.