Datasheet > LP3991

LP3991

更新时间： 2024-11-23 05:42:35

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器
页数	文件大小	规格书
14页	316K
描述
300mA Linear Voltage Regulator for Digital Applications

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LP3991 数据手册

January 2007

LP3991

300mA Linear Voltage Regulator for Digital Applications

General Description

Features

Operating from a minimum input voltage of 1.65V, the LP3991

regulator has been designed to provide fixed stable output

voltages for load currents up to 300mA. This device is suitable

where accurate, low voltages are required from low input volt-

age sources and is therefore suitable for post regulation of

switched mode regulators. In such applications, significant

improvements in performance and EMI can be realized, with

little reduction in overall efficiency. The LP3991 will provide

fixed outputs as low as 1.2V from a wide input range of 1.65V

to 3.6V Using the enable pin, the device may be controlled to

provide a shutdown state, in which negligible supply current

is drawn.

Operation from 1.65V to 3.6V Input

■

1% accuracy at room temperature

Output Voltage from 1.2V to 2.8V

125mV Dropout at 300mA load

50µA Quiescent Current at 1mA Load

Inrush Current controlled to 600mA

PSRR 65dB at 1kHz

100µs Start-Up time for 1.5V V_OUT

Stable with Ceramic Capacitors as small as 0402

■

Thermal-Overload and Short-Circuit Protection

The LP3991 is designed to be stable with space saving ce-

ramic capacitors as small as 0402 case size.

Package

4 pin micro SMD (0.963mm x 1.446mm)

Performance is specified for a -40°C to 125°C junction tem-

perature range.

For other package options contact your NSC sales office.

For output voltage options please contact your local NSC

sales office.

Applications

Post DC/DC Regulator

■

Battery Operated Devices

Hand-Held Information Appliances

■

Typical Application Circuit

20110002

201100

www.national.com

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