peculiarity
Micro 5 I/O in micro SMD and SOT-23-5 packages
Logic control enablement
Stable with ceramic and high-quality tantalum capacitors
Quick on
Thermal shutdown and short-circuit current limiting
illustrate
The LP3985 is designed for portable and wireless applications with demanding performance and space requirements.
The LP3985 is a small 1μF ± 30% ceramic or high-quality tantalum output capacitor stabilized. Micro SMDs require the smallest possible printed circuit board area - the total application circuit area can be less than a fraction of a 1206 size of 2.0 mm x 2.5 mm.
The LP3985 is optimized for performance, and the battery-powered system provides ultra-low noise, very low dropout and low quiescent current. The regulator's ground current only slightly increases dropouts, further extending battery life.
An optional external bypass capacitor reduces output noise without slowing down load transient response. The quick start-up time is achieved by utilizing an internal power supply circuit that actively precharges bypass capacitors.
Power suppression is at low frequencies above 50 dB and begins to be rolled out at 1kHz. High power supply rejection is common in battery-powered circuits to maintain low input voltages to.
The device is ideal for mobile phones and battery-like wireless applications. It offers up to 150 mAh, 2.5V to 6V input. The LP3985 consumes less than 1.5μA and has a fast on-on time of more than 200μS in prohibition mode.
The LP3985 is available in a 5-bump micro SMD, 5-bump micro SMD, 5-bump micro SMD, 5-bump low-profile micro SMD, and 5-pin SOT-23 package. Performance is available in the -40°C to +125°C temperature range and is available in 2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 2.9V, 3.0V. 3.1V, 3.2V, 3.3V, 4.7V, 4.75V, 4.8V and 5.0V output voltages. For other output voltages ranging from 2.5V to 5.0V or a dual LP3985 option, please contact the National Semiconductor Sales Office.
Key specifications:
2.5至6.0V输入范围
150毫安保证输出
50分贝的PSRR在1kHz @ V IN = V OUT + 0.2V
快速启动时间：200μs（典型）
100mV的最大压降与150毫安负载
30μVrms输出噪声超过10Hz至100kHz（典型值）
-40至+125 ° C的结工作温度范围
2.5V，2.6V，2.7V，2.8V，2.85V，2.9V，3.0V，3.1V，3.2V，3.3V，4.7V，4.75V，4.8V和5.0V输出标准
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CDMA cellular phone
Broadband CDMA cellular phones
GSM cellular phones
Portable information appliances