LM3489-Q1

ACTIVE

Automotive Grade 4.5-35V, Hysteretic Non-Synchronous PFET Buck Controller with Enable Pin

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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 35 Vout (Min) (V) 1.239 Vout (Max) (V) 35 Iout (Max) (A) 4 Iq (Typ) (mA) 0.28 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 open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Buck controllers (external switch)

Features

  • 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
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Description

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
* Datasheet LM3489x Hysteretic PFET Buck Controller With Enable Pin datasheet (Rev. C) Dec. 16, 2016
User guides AN-1471 LM3489 Demonstration Board (Rev. A) Apr. 25, 2013

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$49.00
Description

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 (...)

Features
  • Wide 4.5V to 35V input range
  • 1.239V to VIN adjustable output range
  • High efficiency 93%
  • 1.3% ( 2% over temp) internal reference
  • 100% duty cycle operation
  • Maximum operation frequency > 1MHz
  • Current limit protection
  • Dedicated enable pin (on if unconnected)
  • Shutdown mode draws on 7uA supply current
  • MSOP-8

(...)

Reference designs

REFERENCE DESIGNS Download
Power DUO Source 200W USB-C PD Reference Design
TIDA-050012 — 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.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Non sync buck Hysteretic Controller for 9-18V input and 8V,3A output
PMP7771 — This circuit is a non synchronous buck hysteretic controller. It uses a low ESR ceramic capacitor at the output and uses a series resistor to generate the ripple. It uses LM3489 which is a high efficiency PFET switching regulator controller. The PFET architecture also allows for low component count (...)
Design files

CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options

Ordering & quality

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