LP3905数据手册集成电路（IC）的电源管理-专用规格书PDF

描述 Description

LP3905 is a multi-functional Power Management Unit, optimized for low power handheld applications. This device integrates two 600mA DC-DC buck regulators and two 150mA linear regulators. Fixed and adjustable buck output versions are available. The LP3905 additionally features two enable pins for the device output control and is offered in an WSON package.

特性 Features

• Two Buck Regulators for Powering High Current Processor Functions or Peripheral Devices
• Two Linear Regulators for Powering Internal Processor Functions and I/Os
• One Enable Pin for Buck1 and Linear Regulators 1 and 2
• Separate Enable Pin for Buck2
• Thermal and Current Overload Protection
• Small 14–Pin WSON Package (4x4mmx0.8mm)
Key Specifications
• Buck Regulators

- Fixed and Adjustable Voltage Options, Range 1.0V to 3.3V
• Up to 90% Efficiency
• Auto-Switching PFM-PWM Mode and Fixed PWM Mode
• 2MHz PWM Fixed Switching Frequency (Typ)
• 600mA Output Current
• ±4% Output Voltage Accuracy Over Temp
• Internal SoftStart
• 2.2µH Inductor, 10µF Input and Output Caps
• Linear Regulators

- Output Options in the Range 1.5V to 3.3V
• 13.5µVrms Output Voltage Noise
• PSRR - 70dB @ 1kHz
• ±3% Output Voltage Accuracy Over Full Line and Load Regulation
• 0mA to 150mA Output Current
• Cin = 1.0µF, Cout = 0.47µF for 100mA O/P
• Cin = 1.0µF, Cout = 1.0µF for 150mA O/P
• 80mV Dropout Voltage