LP78081 Datasheet, PDF (1/8 Pages) Lowpower Semiconductor inc – 600mA High Efficiency Synchronous Buck with 350mA LDO

Preliminary Datasheet
LP78081
600mA High Efficiency Synchronous Buck with 350mA LDO
General Description
The LP78081 are PMU, and contain a 600mA Buck
DC/DC and a 350mA Linear Regulator, Buck DC/DC is
a constant frequency, current mode, PWM step-down
converter.The device integrates a main switch and a
synchronous rectifier for high efficiency. The 2.7V to
6.5V input voltage range makes the LP78081 is ideally
suited for portable electronic devices that are powered
from 1-cell Li-ion battery or from other power sources
within the range such as cellular phones, PDAs and
handy-terminals. Internal synchronous rectifier with
low RDS(ON) dramatically reduces conduction loss at
PWM mode. The internal synchronous switch
increases efficiency while eliminate the need for an
external Schottky diode.The switching ripple is easily
smoothed-out by small package filtering elements due
to a fixed operation frequency of 1.5MHz. This along
with small SOT-23-6 package provide small PCB area
application. Other features include soft start, lower
internal reference voltage with 2% accuracy, over
temperature protection, and over current protection。
Ordering Information
LP78081 - □ □ □ □ □
Features
600mA Buck High Efficiency: 96% 
1.5MHz Fixed-Frequency PWM Operation
Adjustable Output From 0.6V to VIN 　
350mA LDO: 3.0V and 3.3V Fixed output
100% Duty Cycle Low Dropout Operation
Available in SOT23-6 Package 　
Low than 1µA Shutdown Current
Applications
Portable Media Players/MP3 players
Cellular and Smart mobile phone
PDA
DSC
Wireless Card
Pin Configurations
(TOP View)
F: Pb-Free
Package Type
B6: SOT23-6
LDO Output Voltage Type
30: 3.0V
33: 3.3V
PIN NO. 1
2
3
4
5
6
Function GND VDD SW FB EN OUT
Marking Information
Please see website.
LP78081 – Ver. 1.0 Datasheet Feb.-2008
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