LP3990 Datasheet | National Semiconductor

Description The LP3990 regulator is designed to meet the requirements of portable, battery-powered systems providing an accurate output voltage, low noise, and low quiescent current. The LP3990 will provide a 0.8V output from the low input voltage of 2V at up to 150m A load current. When switched into shutdown mode via a logic signal at the enable pin, the power consumption is reduced to virtually zero. The LP3990 is designed to be stable with space saving ceramic capacitors as small as 0.47µF. Performance is specified for a -40˚C to 125˚C junction temperature range. For output voltages other than 0.8V, 1.35V, 1.5V, 1.8V, 2.5V, 2.8V, or 3.3V please contact your local NSC sales office. Key Specifications n n n n n n n n n Input Voltage Range Output Voltage Range Output Current Output Stable - Capacitors Virtually Zero IQ (Disabled) Very Low IQ (Enabled) Low Output Noise PSRR Fast Start Up 2.0 to 6.0V 0.8 to 3.3V 150m A 0.47u F < 10n A 43u A 150u VRMS 55d B at 1k Hz 105us Package All available in Lead Free option. 4 Pin micro SMD 6 pin LLP (SOT23 footprint) SOT23 - 5 For other package options contact your NSC sales office. Features n n n n n 1% Voltage Accuracy at Room Temperature Stable with Ceramic Capacitor Logic Controlled Enable No Noise Bypass Capacitor Required Thermal-Overload and Short-Circuit Protection 1 mm x 1.28mm Applications n Cellular Handsets n Hand-Held Information Appliances Typical Application Circuit © 2004 National Semiconductor Corporation DS200768 .national. Pin Descriptions Packages Pin No LLP 5 micro SMD A2 SOT23-5 3 VEN Enable Input; Enables the Regulator when ≥ 0.95V. Disables the Regulator when ≤ 0.4V. Enable Input has 1MΩ pulldown resistor to GND. mon Ground. Connect to Pad. Voltage output. A 0.47µF Low ESR Capacitor should be connected to this Pin. Connect this output to the load circuit. Voltage Supply Input. A 1.0µF capacitor should be connected at this input. No Connection. Do not connect to any other pin. No...