LP3990MF-2.8/NOPB集成电路（IC）的线性+开关稳压器规格书PDF中文资料

LP3990MF-2.8/NOPB属于集成电路（IC）的线性+开关稳压器。由美国德州仪器公司制造生产的LP3990MF-2.8/NOPB稳压器 - 线性线性稳压器用于提供稳定的输出电压，无论负载电流、输入电压或环境因素如何变化，这些输出电压通常都要保持不变。它们的工作原理要求输入电压维持在高于所需的输出电压，而且要超出某个最小量，并且在工作时会将输入端的任何多余电压转换为热量。对于大多数应用而言，虽然这种稳压器的效率低于开关模式的稳压器，但它们通常更适合对噪声高度敏感的应用。

1 Features

1• 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), < 10 nA

• Very Low IQ (Enabled), 43 μA

• Low Output Noise, 150 μVRMS

• PSRR, 55 dB at 1 kHz

• Fast Start-Up, 105 μs

2 Applications

• Cellular Handsets

• Hand-Held Information Appliances

3 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.