LP3995 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – Micropower 150mA CMOS Voltage Regulator with Active Shutdown

January 4, 2008
LP3995
Micropower 150mA CMOS Voltage Regulator with Active
Shutdown
General Description
The LP3995 linear regulator is designed to meet the require-
ments of portable battery-powered applications and will pro-
vide an accurate output voltage with low noise and low
quiescent current. Ideally suited for powering RF/Analog de-
vices, this device will also be used to meet more general
circuit needs in which a fast turn-off is essential.
For battery powered applications the low dropout and low
ground current provided by the device allows the lifetime of
the battery to be maximized. The Enable(/Disable) control al-
lows the system to further extend the battery lifetime by
reducing the power consumption to virtually zero.
The Enable(/Disable) function on the device incorporates an
active discharge circuit on the output for faster device shut-
down. Where the fast turn-off is not required the LP3999 linear
regulator is recommended.
The LP3995 also features internal protection against short-
circuit currents and over-temperature conditions.
The LP3995 is designed to be stable with small 1.0 µF ce-
ramic capacitors. The small outline of the LP3995 micro SMD
package with the required ceramic capacitors can realize a
system application within minimal board area.
Performance is specified for a −40°C to +125°C temperature
range.
The device is available in micro SMD package and LLP pack-
age. For other package options contact your local NSC sales
office.
The device is available in fixed output voltages in the ranges
1.5V to 3.3V. For availability, please contact your local NSC
sales office.
Key Specifications
■ ^{2.5V to 6.0V Input Range}
■ ^{Accurate Output Voltage; ±75mV / 2%}
■ ^{60 mV Typical Dropout with 150 mA Load}
■ ^{Virtually Zero Quiescent Current when Disabled}
■ ^{Low Output Voltage Noise}
■ ^{Stable with a 1 µF Output Capacitor}
■ ^{Guaranteed 150 mA Output Current}
■ ^{Fast Turn-on; 30 µs (Typ.)}
■ ^{Fast Turn-off; 175 µs (Typ.)}
Features
■ ^{5 pin micro SMD Package}
■ ^{6 pin LLP Package}
■ ^{Stable with Ceramic Capacitor}
■ ^{Logic Controlled Enable}
■ ^{Fast Turn-on}
■ ^{Active Disable for Fast Turn-off.}
■ ^{Thermal-overload and Short-circuit Protection}
■ ^{−40 to +125°C Junction Temperature Range for Operation}
Applications
■ ^{GSM Portable Phones}
■ ^{CDMA Cellular Handsets}
■ ^{Wideband CDMA Cellular Handsets}
■ ^{Bluetooth Devices}
■ ^{Portable Information Appliances}
Typical Application Circuit
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