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LM1771SMM データシート(PDF) 1 Page - Texas Instruments

部品番号 LM1771SMM
部品情報  Low-Voltage Synchronous Buck Controller
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LM1771SMM データシート(HTML) 1 Page - Texas Instruments

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LM1771
SNVS446D – JUNE 2006 – REVISED JANUARY 2016
LM1771 Low-Voltage Synchronous Buck Controller With Precision Enable and No
External Compensation
1 Features
3 Description
The LM1771 device is an efficient synchronous buck
1
Input Voltage Range of 2.8 V to 5.5 V
switching controller with a precision enable requiring
0.8-V Reference Voltage
no external compensation. The constant ON-time
Precision Enable
control scheme provides a simple design free of
compensation
components,
allowing
minimal
No Compensation Required
component count and board space. The precision
Constant Frequency Across Input Range
enable pin allows flexibility in sequencing multiple
Low Quiescent Current of 400 µA
rails
and
setting
UVLO.
The
LM1771
also
incorporates a unique input feedforward to maintain a
Internal Soft-Start
constant frequency independent of the input voltage.
Short Circuit Protection
The LM1771 is optimized for a low-voltage input
6-Pin WSON Package and 8-Pin VSSOP Package
range of 2.8 V to 5.5 V and can provide an adjustable
output as low as 0.8 V. Driving an external high-side
2 Applications
PFET and low-side NFET, it can provide efficiencies
as high as 95%.
Simple-to-Design, High-Efficiency, Step-Down
Switching Regulators
Three
versions
of
the
LM1771
are
available
depending on the switching frequency desired for the
FPGAs, DSPs, and ASIC Power Supplies
application. Nominal switching frequencies are in the
Set-Top Boxes
range of 100 kHz to 1000 kHz.
Cable Modems
Printers
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
Digital Video Recorders
WSON (6)
3.00 mm × 3.00 mm
Servers
LM1771
VSSOP (8)
3.00 mm × 3.00 mm
Graphic Cards
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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