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LP3999 Dataheets PDF



Part Number LP3999
Manufacturers National Semiconductor
Logo National Semiconductor
Description Low Noise 150mA Voltage Regulator
Datasheet LP3999 DatasheetLP3999 Datasheet (PDF)

December 2003 www.DataSheet4U.com LP3999 Low Noise 150mA Voltage Regulator for RF/Analog Applications LP3999 Low Noise 150mA Voltage Regulator for RF/Analog Applications General Description The LP3999 regulator is designed to meet the requirements of portable wireless battery-powered applications and will provide an accurate output voltage with low noise and low quiescent current. Ideally suited for powering RF/Analog devices this device will also be used to meet more general circuit requireme.

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December 2003 www.DataSheet4U.com LP3999 Low Noise 150mA Voltage Regulator for RF/Analog Applications LP3999 Low Noise 150mA Voltage Regulator for RF/Analog Applications General Description The LP3999 regulator is designed to meet the requirements of portable wireless battery-powered applications and will provide an accurate output voltage with low noise and low quiescent current. Ideally suited for powering RF/Analog devices this device will also be used to meet more general circuit requirements. 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 inclusion of an Enable(disable) control can be used by the system to further extend the battery lifetime by reducing the power consumption to virtually zero. Should the application require a device with an active disable function please refer to device LP3995. The LP3999 also features internal protection against shortcircuit currents and over-temperature conditions. The LP3999 is designed to be stable with small 1.0 µF ceramic capacitors. The small outline of the LP3999 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 package. For other package options contact your local NSC sales office. The device is available in fixed output voltages in the ranges of 1.5V to 3.3V. For availability, please contact your local NSC sales office. Key Specifications n n n n n n n n 2.5V to 6.0V Input Range Accurate Output Voltage; ± 75mV / 2% 60 mV Typical Dropout with 150 mA Load. Vout > 2.5V Virtually Zero Quiescent Current when Disabled 10 µVrms output noise over 10Hz to 100kHz Stable with a 1 µF Output Capacitor Guaranteed 150 mA Output Current Fast Turn-on Time; 140 µs (Typ.) Features n n n n n n n 5 pin micro SMD Package 6 pin LLP Package Stable with Ceramic Capacitor Logic Controlled Enable Fast Turn-on Thermal-overload and short-circuit protection −40 to +125˚C junction temperature range for operation Applications n n n n n n GSM Portable Phones CDMA Cellular Handsets Wideband CDMA Cellular Handsets Bluetooth Devices Portable Information Appliances Handheld MP3 Devices Typical Application Circuit 20052001 © 2003 National Semiconductor Corporation DS200520 www.national.com LP3999 Block Diagram www.DataSheet4U.com 20052002 Pin Description Package 5 pin micro SMD Pin No. micro SMD A1 B2 C1 C3 A3 LLP 3 2 6 1 4 5 Pad VEN GND VOUT VIN CBYPASS N/C GND Enable Input; Disables the Regulator when ≤ 0.4V. Enables the regulator when ≥ 0.9V Common Ground Voltage output. Connect this output to the load circuit. Voltage Supply Input Bypass Capacitor connection. Connect a 0.01 µF capacitor for noise reduction. No internal connection. There should not be any board connection to this pin. Ground connection. Connect to ground plane for best .


LT3439 LP3999 RNA51953A


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