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 Automotive
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 Automotive
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.

Download

Similar products you might be interested in

Same functionality with different pin-out to the compared device.
LM61440-Q1 ACTIVE Automotive 3-V to 36-V, 4-A, low-noise synchronous step-down converter Next-generation 3-V to 36-V, 4-A, low-noise synchronous step-down converter.

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 2
Type Title Date
* Data sheet LM3489x Hysteretic PFET Buck Controller With Enable Pin datasheet (Rev. C) 16 Dec 2016
User guide AN-1471 LM3489 Demonstration Board (Rev. A) 25 Apr 2013

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 (...)

In stock
Limit: 5
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 (...)
Reference designs

TIDA-050012 — Power DUO Source 200W USB-C PD Reference Design

The Power DUO Source 200 W USB-C PD Reference Design is a complete USB PD Source reference design that allows users to select their USB PD source voltage.
Package Pins Download
VSSOP (DGK) 8 View options

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

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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