LM1771

ACTIVE

Low-Voltage Synchronous Buck Controller with Precision Enable and No External Compensation

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Product details

Parameters

Vin (Min) (V) 2.8 Vin (Max) (V) 5.5 Vout (Min) (V) 0.8 Vout (Max) (V) 4.5 Iout (Max) (A) 6 Iq (Typ) (mA) 0.4 Iq (Typ) (uA) 400 Switching frequency (Min) (kHz) 500 Switching frequency (Max) (kHz) 2000 Features Enable Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Number of Phases 1 Rating Catalog open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

VSSOP (DGK) 8 15 mm² 3 x 4.9 WSON (NGG) 6 9 mm² 3 x 3 open-in-new Find other Buck controllers (external switch)

Features

  • Input Voltage Range of 2.8 V to 5.5 V
  • 0.8-V Reference Voltage
  • Precision Enable
  • No Compensation Required
  • Constant Frequency Across Input Range
  • Low Quiescent Current of 400 µA
  • Internal Soft-Start
  • Short Circuit Protection
  • 6-Pin WSON Package and 8-Pin VSSOP Package
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Description

The LM1771 device 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 feedforward to maintain a constant frequency independent of the input voltage. The LM1771 is optimized for a low-voltage input 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 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 100 kHz to 1000 kHz.

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Technical documentation

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Type Title Date
* Datasheet LM1771 Low-Voltage Synchronous Buck Controller With Precision Enable and No External Compensation datasheet (Rev. D) Jan. 08, 2016
Technical articles How to implement voltage monitoring Jul. 22, 2015
User guide AN-1477 LM1771 Evaluation Board (Rev. B) Apr. 23, 2013
Application note Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) Apr. 23, 2013

Design & development

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Hardware development

EVALUATION BOARD Download
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Description

LM1771 Low-Voltage Synchronous Buck Controller with Precision Enable and No External Compensation

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 mA
  • Internal soft-start
  • Short circuit protection
  • Tiny LLP-6 package and MSOP-8 package

Applications

  • Simple to design, High-Efficiency Step-Down (...)

Design tools & simulation

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Features
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  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
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CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options
WSON (NGG) 6 View options

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