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.