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LP3905

National Semiconductor
Part Number LP3905
Manufacturer National Semiconductor
Description Power Management Unit For Low Power Handheld Applications
Published Dec 27, 2006
Detailed Description www.DataSheet4U.com LP3905 Power Management Unit For Low Power Handheld Applications August 2006 LP3905 Power Managem...
Datasheet PDF File LP3905 PDF File

LP3905
LP3905

Overview
www.
DataSheet4U.
com LP3905 Power Management Unit For Low Power Handheld Applications August 2006 LP3905 Power Management Unit For Low Power Handheld Applications General 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 LLP package.
Key Specifications Buck Regulators n Fixed and adjustable voltage options, range 1.
0V to 3.
3V * n Up to 90% Efficiency n Auto-switching PFM-PWM mode and fixed PWM mode n 2MHz PWM fixed switching frequency (Typ) n 600mA output current n ± 4% output voltage accuracy over temp.
n Internal softstart n 2.
2µH inductor, 10µF Input and 10µF output Caps Linear Regulators n Output options in the range 1.
5V to 3.
3V * n 13.
5µVrms output voltage noise n PSRR - 70dB @ 1kHz n ± 3% output voltage accuracy over full line and load regulation n 0mA to 150mA output current n Cin = 1.
0µF, Cout = 0.
47µF for 100mA O/P Cin = 1.
0µF, Cout = 1.
0µF for 150mA O/P 80mV Dropout voltage * Fixed output voltage devices can be customized to fit system requirements.
Please contact National Semiconductor Sales Office.
Features n Two buck regulators for powering high current processor functions or peripheral devices n Two linear regulators for powering internal processor functions and I/Os n One enable pin for Buck1 and Linear Regulators 1 & 2 n Separate enable pin for Buck2 n Thermal and current overload protection n Small 14–Pin LLP package (4mm x 4mm x 0.
8mm) Applications n n n n Baseband Processors Peripheral Processor (Video, Audio) I/O Power FPGA Power Typical Application Circuit 20152901 FIGURE 1.
Typical Application Circuit – 14 Pin LLP Package © 2006 National Semiconductor Corporation DS201529 www.
national.
com LP3905 Block Diagram 20152902 FIGURE 2.
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