1FEATURES

• 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)

APPLICATIONS

• Baseband Processors

• Peripheral Processor (Video, Audio)

• I/O Power

• FPGA Power

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.

KEY SPECIFICATIONS

Buck Regulators

• Fixed and Adjustable Voltage Options, Range

1.0V to 3.3V(1)

• 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(1)

• 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