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LM1771

Features: Input voltage range of 2.8V to 5.5V0.8V reference voltagePrecision enableNo compensation requiredConstant frequency across input rangeLow quiescent current of 400 µAInternal soft-startShort circuit protectionTiny LLP-6 package and MSOP-8 packageApplicationSimple To Design, High Eff...

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SeekIC No. : 004394689 Detail

LM1771: Features: Input voltage range of 2.8V to 5.5V0.8V reference voltagePrecision enableNo compensation requiredConstant frequency across input rangeLow quiescent current of 400 µAInternal soft-sta...

LM1771 Data Sheet

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Part Number:
LM1771
Supply Ability:
5000

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  • 1~5000
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Product Details

Description



Features:

Input voltage range of 2.8V to 5.5V
0.8V reference voltage
Precision enable
No compensation required
Constant frequency across input range
Low quiescent current of 400 µA
Internal soft-start
Short circuit protection
Tiny LLP-6 package and MSOP-8 package


Application

Simple To Design, High Efficiency Step Down Switching Regulators
FPGAs, DSPs, and ASIC Power Supplies
Set-Top Boxes
Cable Modems
Printers
Digital Video Recorders
Servers
Graphic Cards


Pinout

Connection Diagram


Specifications

VIN -                                                         0.3V to 6V
EN, FB, HG, LG                                       -0.3V to VIN
Storage Temperature Range          −65°C to 150°C
Junction Temperature                                    150°C
Lead Temperature (soldering, 10sec)            260°C
ESD Rating                                                          2kV


Description

The LM1771 is an efficient synchronous buck switching controller with a precision enable requiring no external compensation. 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.




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