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LP3905

Texas Instruments
Part Number LP3905
Manufacturer Texas Instruments
Description Power Management
Published Jul 9, 2020
Detailed Description LP3905 www.ti.com SNVS374D – JUNE 2006 – REVISED MAY 2013 LP3905 Power Management Unit For Low Power Handheld Applica...
Datasheet PDF File LP3905 PDF File

LP3905
LP3905

Overview
LP3905 www.
ti.
com SNVS374D – JUNE 2006 – REVISED MAY 2013 LP3905 Power Management Unit For Low Power Handheld Applications Check for Samples: LP3905 FEATURES 1 • 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 (1) Fixed output voltage devices can be customized to fit system requirements.
Please contact Texas Instruments Sales Office.
Typical Application Circuit Enable 1 LDO2 Output VSupply LDO1 Output Enable 2 0.
47 PF 1.
0 PF 0.
47 PF LDO GND LP3905 EN2 FB2 TGND GND_B2 LDO2 SW2 Vin2 Vin1 LDO1 SW1 GND GND_B1 EN1 FB1 SGND 2.
2 PH 2.
2 PH 10 PF 10 PF 10 PF ...


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