Product
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LM1770
  • LM1770
  • LM1770
  • LM1770
  • LM1770

LM1770

ACTIVE

Low-Voltage SOT23 Synchronous Buck Controller With No External Compensation

Texas Instruments LM1770 Product Info

1 April 2026 5

Parameters

Rating

Catalog

Iout (max) (A)

4

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

Light Load Efficiency

Duty cycle (max) (%)

98

Iq (typ) (A)

0.0004

Number of phases

1

Operating temperature range (°C)

-40 to 125

Package

SOT-23 (DBV)-5-8.12 mm² 2.9 x 2.8

Features

  • Input Voltage Range of 2.8V to 5.5V
  • 0.8V Reference Voltage
  • No Compensation Required
  • Constant Frequency Across Input Range
  • Low Quiescent Current of 400µA
  • Internal Soft-start
  • Short Circuit Protection
  • 5-Pin SOT-23 Package

All trademarks are the property of their respective owners.

  • Input Voltage Range of 2.8V to 5.5V
  • 0.8V Reference Voltage
  • No Compensation Required
  • Constant Frequency Across Input Range
  • Low Quiescent Current of 400µA
  • Internal Soft-start
  • Short Circuit Protection
  • 5-Pin SOT-23 Package

All trademarks are the property of their respective owners.

Description

The LM1770 is an efficient synchronous buck switching controller in a tiny SOT-23 package. The constant on-time control scheme provides a simple design free of compensation components, allowing minimal component count and board space. It also incorporates a unique input feed-forward to maintain a constant frequency independent of the input voltage. The LM1770 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 LM1770 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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