LM3489QMM

• Easy-to-use control method
• No control loop compensation is required
• Wide 4.5V to 35V input range
• 1.239V to V_INAdjustable output range
• High efficiency: 93%
• ± 1.3% (± 2% temperature) internal reference
• 100% duty cycle operation
• Maximum operating frequency > 1MHz
• Current limit protection
• Dedicated enable pin (if floating)
• Only 7μA of supply current is consumed in shutdown mode
• Adopt MSOP-8
• LM3489 is AEC - Q100 Standard Class 1 qualified

illustrate

The LM3489 is PFET's high efficiency switching regulator controller that can be used to quickly and easily develop small, cost-effective, switching buck regulators for a wide range of applications. The hysteresis control architecture provides a simple design without any control loop stability, using a wide variety of external component concerns. PFET's architecture also allows for low component count, as well as ultra-low dropout, 100% duty cycle operation. Another benefit is the increased output ripple at light loads with high efficiency and no operation. A dedicated enable pin provides a shutdown mode and the drawing is only 7μA. Just leave the enable pin default.

Voltage measurement of the R of PFET_DS（ON）A current limit protection function can be implemented, eliminating the need for a sense resistor. A sense resistor can be used to improve existing current limiting accuracy, if needed. Cycle-by-cycle current limiting allows the output current range of a resistor to be adjusted to ensure safe operation.

apply

• Stb
• DSL/cable modem
• PC / IA
• Automatic computer
• TFT display
• Battery-powered portable applications
• Distributed power systems
• Total power switch
• High power LED driver
• Car