DataSheetWiki


LM1771 fiches techniques PDF

National Semiconductor - Low Voltage synchronous buck controller

Numéro de référence LM1771
Description Low Voltage synchronous buck controller
Fabricant National Semiconductor 
Logo National Semiconductor 





1 Page

No Preview Available !





LM1771 fiche technique
www.DataSheet4U.com
June 2006
LM1771
Low-Voltage Synchronous Buck Controller with
Precision Enable and No External Compensation
General Description
The LM1771 is an efficient synchronous buck switching con-
troller with a precision enable requiring no external compen-
sation. The constant on-time control scheme provides a
simple design free of compensation components, allowing
minimal component count and board space. The precision
enable pin allows flexibility in sequencing multiple rails and
setting UVLO. The LM1771 also incorporates a unique input
feed-forward to maintain a constant frequency independent
of the input voltage. The LM1771 is optimized for a low
voltage input range of 2.8V to 5.5V and can provide an
adjustable output as low as 0.8V. Driving an external high
side PFET and low side NFET it can provide efficiencies as
high as 95%.
Three versions of the LM1771 are available depending on
the switching frequency desired for the application. Nominal
switching frequencies are in the range of 100kHz to
1000kHz.
Features
n Input voltage range of 2.8V to 5.5V
n 0.8V reference voltage
n Precision enable
n No compensation required
n Constant frequency across input range
n Low quiescent current of 400 µA
n Internal soft-start
n Short circuit protection
n Tiny LLP-6 package and MSOP-8 package
Applications
n Simple To Design, High Efficiency Step Down Switching
Regulators
n FPGAs, DSPs, and ASIC Power Supplies
n Set-Top Boxes
n Cable Modems
n Printers
n Digital Video Recorders
n Servers
n Graphic Cards
Typical Application Circuit
© 2006 National Semiconductor Corporation DS201890
20189001
www.national.com

PagesPages 18
Télécharger [ LM1771 ]


Fiche technique recommandé

No Description détaillée Fabricant
LM1770 LM1770 Low-V SOT23 Synch Buck Cntrr w/No Ext Compensation (Rev. C) Texas Instruments
Texas Instruments
LM1770 SOT-23 Synchronous Buck Controller National Semiconductor
National Semiconductor
LM1771 Low-Voltage Synchronous Buck Controller Texas Instruments
Texas Instruments
LM1771 Low Voltage synchronous buck controller National Semiconductor
National Semiconductor

US18650VTC5A

Lithium-Ion Battery

Sony
Sony
TSPC106

PCI Bus Bridge Memory Controller

ATMEL
ATMEL
TP9380

NPN SILICON RF POWER TRANSISTOR

Advanced Semiconductor
Advanced Semiconductor


www.DataSheetWiki.com    |   2020   |   Contactez-nous  |   Recherche