Operating from a minimum input voltage of 1.65 V, the LP3991 LDO has been designed to
provide fixed stable output voltages for load currents up to 300 mA. This device is suitable where
accurate low voltages are required from low input voltage 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
provides fixed outputs as low as 1.2 V from a wide input range from 1.65 V to 4 V Using the enable
(EN) 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 ceramic capacitors as small as 0402
Performance is specified for a –40°C to +125°C junction temperature range. For output
voltage options, contact your local Texas Instruments sales office.
For all available packages, see the orderable addendum at the
end of the datasheet.
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