LM3489

ACTIVE

Hysteretic PFET Buck Controller with Enable Pin

A newer version of this product is available

open-in-new Compare alternates
Same functionality with different pin-out to the compared device
LM25148 ACTIVE 42-V synchronous buck DC/DC controller with ultra-low IQ Improved EMI performance with QFN package and dual random spread spectrum.

Product details

Vin (min) (V) 4.5 Vin (max) (V) 35 Iout (max) (A) 4 Operating temperature range (°C) -40 to 125 Control mode Hysteretic Topology Buck Controller Rating Catalog Vout (min) (V) 1.239 Vout (max) (V) 35 Features Enable Iq (typ) (µA) 280 Duty cycle (max) (%) 100 Number of phases 1
Vin (min) (V) 4.5 Vin (max) (V) 35 Iout (max) (A) 4 Operating temperature range (°C) -40 to 125 Control mode Hysteretic Topology Buck Controller Rating Catalog Vout (min) (V) 1.239 Vout (max) (V) 35 Features Enable Iq (typ) (µA) 280 Duty cycle (max) (%) 100 Number of phases 1
VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Qualified for Automotive Parts
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C5
  • Easy-to-Use Control Methodology
  • No Control Loop Compensation Required
  • Wide 4.5-V to 35-V Input Range
  • 1.239 V to VIN Adjustable Output Range
  • High Efficiency: 93%
  • ±1.3% (±2% Over Temperature) Internal Reference
  • 100% Duty Cycle Operation
  • Maximum Operation Frequency > 1 MHz
  • Current Limit Protection
  • Dedicated Enable Pin (on if Unconnected)
  • Shutdown Mode Draws Only 7-µA Supply Current
  • 8-Pin VSSOP Package
  • Qualified for Automotive Parts
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C5
  • Easy-to-Use Control Methodology
  • No Control Loop Compensation Required
  • Wide 4.5-V to 35-V Input Range
  • 1.239 V to VIN Adjustable Output Range
  • High Efficiency: 93%
  • ±1.3% (±2% Over Temperature) Internal Reference
  • 100% Duty Cycle Operation
  • Maximum Operation Frequency > 1 MHz
  • Current Limit Protection
  • Dedicated Enable Pin (on if Unconnected)
  • Shutdown Mode Draws Only 7-µA Supply Current
  • 8-Pin VSSOP Package

The LM3489 device is a high-efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, cost-effective, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control loop stability concerns using a wide variety of external components. The PFET architecture also allows for low component count as well as ultra-low dropout, 100% duty cycle operation. Another benefit is high efficiency operation at light loads without an increase in output ripple. A dedicated enable pin provides a shutdown mode drawing only 7 µA. Leaving the enable pin unconnected defaults to on.

Current limit protection can be implemented by measuring the voltage across the PFET’s RDS(ON), thus eliminating the need for a sense resistor. A sense resistor may be used to improve current limit accuracy if desired. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents.

The LM3489 device is a high-efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, cost-effective, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control loop stability concerns using a wide variety of external components. The PFET architecture also allows for low component count as well as ultra-low dropout, 100% duty cycle operation. Another benefit is high efficiency operation at light loads without an increase in output ripple. A dedicated enable pin provides a shutdown mode drawing only 7 µA. Leaving the enable pin unconnected defaults to on.

Current limit protection can be implemented by measuring the voltage across the PFET’s RDS(ON), thus eliminating the need for a sense resistor. A sense resistor may be used to improve current limit accuracy if desired. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents.

Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Same functionality with different pin-out to the compared device
LMR33640 ACTIVE SIMPLE SWITCHER® 3.8-V to 36-V, 4-A step-down converter in SOIC-8 package Next-generation 3.8-V to 36-V, 4-A step-down converter in SOIC-8 package.

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 6
Type Title Date
* Data sheet LM3489x Hysteretic PFET Buck Controller With Enable Pin datasheet (Rev. C) PDF | HTML 16 Dec 2016
White paper USB Type-C and USB power delivery power path design considerations (Rev. A) 12 Jun 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 Jul 2016
User guide AN-1471 LM3489 Demonstration Board (Rev. A) 25 Apr 2013
Application note Designing Non-Invert Buck-Boost (Zeta) Cnvrts w/a Buck P-FET Cntrl 22 Apr 2011

Design & development

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

Evaluation board

LM3489EVAL — Hysteretic PFET Buck Controller with Enable Pin

The LM3489 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, cost effective, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control loop stability (...)

User guide: PDF
Not available on TI.com
Evaluation board

TPS65981EVM — TPS65981 USB Type-C® and USB Power Delivery controller, power switch, and high speed multiplexer EVM

The TPS65981EVM is a complete reference design for USB Type-C and Power Delivery Applications featuring a variable DC/DC architecture to optimize board layout and minimize BOM cost.  In addition, when paired with the DP-EXPANSION-EVM the user can emulate a full-featured USB Type-C PD host or (...)
User guide: PDF
Not available on TI.com
Simulation model

LM3489 PSpice Transient Model

SNVM474.ZIP (28 KB) - PSpice Model
Simulation model

LM3489 Unencrypted PSpice Transient Model

SNVM714.ZIP (2 KB) - PSpice Model
Package Pins CAD symbols, footprints & 3D models
VSSOP (DGK) 8 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