LM3489MM Part Information

Details for LM3489MM by Texas Instruments

Electronic & Electrical Components>Semiconductors - ICs>Power Management

Part 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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Part Features

  • 1.239 V to VIN Adjustable Output Range
  • 100% Duty Cycle Operation
  • 8-Pin VSSOP Package
  • AEC-Q100 Qualified With the Following Results: u2013 Device Temperature Grade 1: u201340u00b0C to 125u00b0C Ambient Operating Temperature Range u2013 Device HBM ESD Classification Level 2 u2013 Device CDM ESD Classification Level C5
  • Current Limit Protection
  • Dedicated Enable Pin (on if Unconnected)
  • Easy-to-Use Control Methodology
  • High Efficiency: 93%
  • Maximum Operation Frequency > 1 MHz
  • No Control Loop Compensation Required
  • Qualified for Automotive Parts
  • Shutdown Mode Draws Only 7-u00b5A Supply Current
  • Wide 4.5-V to 35-V Input Range
  • u00b11.3% (u00b12% Over Temperature) Internal Reference

Part Specifications

Supply Voltage Min 4.5V
Supply Voltage Max 35V
No. of Outputs 1 Output, 1Outputs
Duty Cycle (%) 100%
Controller IC Case Style VSSOP
No. of Pins 8Pins
Switching Frequency 1MHz
Topology Buck (Step Down)
Operating Temperature Min -40°C
Operating Temperature Max 125°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant Yes
SVHC No SVHC (27-Jun-2018)
Adjustable Output Voltage Min 1.239V
Base Number 3489
Frequency 1MHz
Input Voltage Max 45V
Input Voltage Min 3.5V
Operating Temperature Range -40°C to +125°C
Output Current 4A
Output Voltage 35V
Primary Input Voltage 35V
Termination Type Surface Mount Device
Voltage Regulator Type Buck
RoHS Compliant

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