1FEATURES
2• Miniature 8-I/O DSBGA Package
• Stable With 1μF Ceramic and High Quality
Tantalum Output Capacitors
• Fast Turn-on
• Two Independent Regulators
• Logic Controlled Enable
• Over Current and Thermal Protection

APPLICATIONS
• CDMA Cellular Handsets
• GSM Cellular Handsets
• Portable Information Appliances
• Portable Battery Applications

DESCRIPTION
The LP3986 is a 150 mA dual low dropout regulator
designed for portable and wireless applications with
demanding performance and board space
requirements.
The LP3986 is stable with a small 1 μF ±30%
ceramic output capacitor requiring smallest possible
board space.
The LP3986's performance is optimized for battery
powered systems to deliver ultra low noise, extremely
low dropout voltage and low quiescent current
independent of load current. Regulator ground current
increases very slightly in dropout, further prolonging
the battery life. Optional external bypass capacitor
reduces the output noise further without slowing down
the load transient response. Fast start-up time is
achieved by utilizing a speed-up circuit that actively
pre-charges the bypass capacitor. Power supply
rejection is better than 60 dB at low frequencies and
55 dB at 10 kHz. High power supply rejection is
maintained at low input voltage levels common to
battery operated circuits.
The LP3986 is available in a DSBGA package.
Performance is specified for a −40°C to +125°C
temperature range. For single LDO applications,
please refer to the LP3985 datasheet.