LP3984IMFX-1.8

• Micro 4-I/O micro SMD and SOT-23-5 packages
• Logic control enablement
• Stable with tantalum capacitors
• 1μF tantalum capacitor output
• Quick on
• Thermal shutdown and short-circuit current limiting

illustrate

The LP3984 is designed for demanding performance and space-constrained portable and wireless applications.

The LP3984 is optimized for performance, and the battery-powered system provides very low dropout voltage and low quiescent current. The regulator ground current only slightly increases dropouts, further extending the life of the battery.

The power supply rejection ratio turns off at 60 dB at low frequency and starts to roll out at 10 kHz. High supply rejection maintains low input voltage levels in universal battery-powered circuitry.

This unit is ideal for use in mobile phones and battery-like wireless applications. It provides inputs from 2.5V to 6V up to 150 mA. The LP3984 consumes less than 1.2μA in shutdown mode and has a fast turn-on time of less than 20 microseconds.

The LP3984 is available in 4-bump micro SMD and 5-pin SOT-23 packages. Performance is available over a temperature range of -40°C to +125°C and is available in 1.5V, 1.8V, 2.0V, 2.9V, and 3.1V output voltages. For other output voltage options from 1.5V to 3.5V, contact the National Semiconductor Sales Office.

Key specifications:

• 2.5 to 6.0V input range
• 150 mAh guaranteed output
• 60 dB PSRR at 1kHz 40 dB at 10kHz@3.1V, IN
• Fast start-on time: 20 microseconds (typical)
• 75mV voltage drop typical with 150 mA load
• -40 to +125°C paired operating temperature range
• 1.5V, 1.8V, 2.0V, 2.9V and 3.1V

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• CDMA cellular phone
• Broadband CDMA cellular phones
• GSM Mobile Phone Phone
• Portable information appliances