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