LM3489 具有启用引脚的滞后 PFET 降压控制器 | 德州仪器 TI.com.cn

LM3489 (正在供货)

具有启用引脚的滞后 PFET 降压控制器

具有启用引脚的滞后 PFET 降压控制器 - LM3489


  • LM25085A  -  4.5-42V wider Vin with COT topology


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.


  • 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


参数 与其它产品相比 降压控制器 (外部开关)

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated Outputs (#)
Number of Phases
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
Control Mode
LM3489 LM3489-Q1
4.5     4.5    
35     35    
1.239     1.239    
35     35    
4     4    
1     1    
1     1    
50     50    
1400     1400    
0.28     0.28    
Enable     Enable    
100     100    
-40 to 125     -40 to 125    
Catalog     Automotive    
Hysteretic     Hysteretic    

其它合格版本 LM3489

版本 器件型号 定义
汽车电子 LM3489-Q1 Q100 适用于追求零缺陷的高可靠性汽车电子应用的器件