Product
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LM1771
  • LM1771
  • LM1771
  • LM1771
  • LM1771
  • LM1771

LM1771

ACTIVE

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

Texas Instruments LM1771 Product Info

1 April 2026 2

Parameters

Rating

Catalog

Iout (max) (A)

6

Vin (max) (V)

5.5

Vin (min) (V)

2.8

Vout (max) (V)

4.5

Vout (min) (V)

0.8

Control mode

Constant on-time (COT)

Features

Enable pin

Duty cycle (max) (%)

98

Iq (typ) (A)

0.0004

Number of phases

1

Operating temperature range (°C)

-40 to 125

Package

VSSOP (DGK)-8-14.7 mm² 3 x 4.9

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
  • 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

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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