LP3991 Datasheet, PDF (1/14 Pages) Intersil Corporation – 300mA Linear Voltage Regulator for Digital Applications

January 2007
LP3991
300mA Linear Voltage Regulator for Digital Applications
General Description
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.
The LP3991 is designed to be stable with space saving ce-
ramic capacitors as small as 0402 case size.
Performance is specified for a -40°C to 125°C junction tem-
perature range.
For output voltage options please contact your local NSC
sales office.
Features
■ ^{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}
Package
4 pin micro SMD (0.963mm x 1.446mm)
For other package options contact your NSC sales office.
Applications
■ ^{Post DC/DC Regulator}
■ ^{Battery Operated Devices}
■ ^{Hand-Held Information Appliances}
Typical Application Circuit
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