LM1770

ACTIVE

Low-Voltage SOT23 Synchronous Buck Controller With No External Compensation

A newer version of this product is available

open-in-new Compare alternates
This product continues to be available for existing customers. New designs should consider an alternate product.
Similar functionality to the compared device
TPS62826 ACTIVE 2.4-V-5.5-V input, 3-A step-down converter with 1% accuracy in 1.5-mm x 1.5-mm VSON-HR package Smaller solution size DC/DC converter family 1 A, 2 A, 3 A and 4 A

Product details

Vin (min) (V) 2.8 Vin (max) (V) 5.5 Iout (max) (A) 4 Operating temperature range (°C) -40 to 125 Control mode Constant on-time (COT) Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 4.5 Features Light Load Efficiency Iq (typ) (µA) 400 Duty cycle (max) (%) 98 Number of phases 1
Vin (min) (V) 2.8 Vin (max) (V) 5.5 Iout (max) (A) 4 Operating temperature range (°C) -40 to 125 Control mode Constant on-time (COT) Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 4.5 Features Light Load Efficiency Iq (typ) (µA) 400 Duty cycle (max) (%) 98 Number of phases 1
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8
  • 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.

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.

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.

Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 5
Type Title Date
* Data sheet LM1770 Low-V SOT23 Synch Buck Cntrr w/No Ext Compensation datasheet (Rev. C) 03 Apr 2013
EVM User's guide AN-1400 LM1770 Evaluation Board (Rev. B) 23 Apr 2013
Application note AN-1414 LM1770 Design Reference (Rev. A) 23 Apr 2013
Application note Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) 23 Apr 2013
Application note Advanced Topics in Powering FPGAs 22 Mar 2007

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Package Pins CAD symbols, footprints & 3D models
SOT-23 (DBV) 5 Ultra Librarian

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos