LP78083 Datasheet, PDF (1/8 Pages) Lowpower Semiconductor inc – 650mA High Efficiency Synchronous Buck with Dual Channel LDO

Preliminary Datasheet
LP78083
650mA High Efficiency Synchronous Buck
with Dual Channel LDO
General Description
The LP78083 are PMU, and contain a 650mA Buck
DC/DC and dual channel 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 2.1V to 6.5V input voltage range makes
the LP78083 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 2*2 DFN-8
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
LP78083 -□ □/ □ □ □ □ □
F: Pb-Free
Package Type
QV: SOT23-6
Out3 Voltage Type
30: 3.0V
33: 3.3V
Out2 Voltage Type
30: 3.0V
33: 3.3V
Features
650mA 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 2*2 TDFN-8 Package 　
Low than 1µA Shutdown Current
Applications
Portable Media Players/MP3 players
Cellular and Smart mobile phone
PDA
DSC
Wireless Card
Pin Configurations
PIN NO
1
2
3
4
5
6
7
8
Function
SW
GND
OUT2
VIN
OUT3
EN
VDD
FB1
Marking Information
Please see website.
LP78083 – Ver. 1.0 Datasheet Feb.-2008
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