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.
Part Downloads
Download PCB Footprint from Ultra Librarian
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 |
| MSL | - |
| 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 |
