LP3990数据手册集成电路（IC）的线性+开关稳压器规格书PDF

描述 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 0.8-V output from the low input voltage of 2 V at up to a 150-mA load current. When switched into shutdown mode via a logic signal at the enable pin (EN), the power consumption is reduced to virtually zero.The LP3990 is designed to be stable with space-saving ceramic capacitors with values as low as 1 µF.Performance is specified for a –40°C to 125°C junction temperature range. For output voltages other than 0.8 V, 1.2 V, 1.35 V, 1.5 V, 1.8 V, 2.5 V, 2.8 V, or 3.3 V, please contact the Texas Instruments sales office.

特性 Features

• 1% Voltage Accuracy at Room Temperature
• Stable with Ceramic Capacitor
• Logic Controlled Enable
• No Noise Bypass Capacitor Required
• Thermal-Overload and Short-Circuit Protection
• Input Voltage Range, 2 V to 6 V
• Output Voltage Range, 0.8 V to 3.3 V
• Output Current, 150 mA
• Output Stable - Capacitors, 1 µF
• Virtually Zero IQ (Disabled), Q (Enabled), 43 µA
• Low Output Noise, 150 µVRMS
• PSRR, 55 dB at 1 kHz
• Fast Start-Up, 105 µs