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 R_DS(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.

• 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

• 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
• Regulated outputs (#)
• 1
• Number of phases
• 1
• Rating
• Catalog

LM3489的完整型号有：LM3489MM/NOPB、LM3489MMX/NOPB、LM3489MM，以下是这些产品的关键参数及官网采购报价：

LM3489MM/NOPB，工作温度：-40 to 125，封装：VSSOP (DGK)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3489MM/NOPB的批量USD价格：.628（1000+）

LM3489MMX/NOPB，工作温度：-40 to 125，封装：VSSOP (DGK)-8，包装数量MPQ：3500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3489MMX/NOPB的批量USD价格：.523（1000+）

LM3489MM，工作温度：-40 to 125，封装：VSSOP (DGK)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNPB，TI官网LM3489MM的批量USD价格：.837（1000+）

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