Product details

Vin (Min) (V) 4.5 Vin (Max) (V) 35 Vout (Min) (V) 1.239 Vout (Max) (V) 35 Iout (Max) (A) 4 Iq (Typ) (uA) 280 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 1400 Features Enable Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Number of phases 1 Rating Catalog
Vin (Min) (V) 4.5 Vin (Max) (V) 35 Vout (Min) (V) 1.239 Vout (Max) (V) 35 Iout (Max) (A) 4 Iq (Typ) (uA) 280 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 1400 Features Enable Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Number of phases 1 Rating Catalog
VSSOP (DGK) 8 15 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.

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Technical documentation

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Type Title Date
* Data sheet LM3489x Hysteretic PFET Buck Controller With Enable Pin datasheet (Rev. C) 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 (...)

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Limit: 5
Evaluation board

TPS65981EVM — TPS65981 USB Type-C™ and USB PD 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 (...)
In stock
Limit: 5
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
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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VSSOP (DGK) 8 View options

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