LM3485MMX

• Easy-to-use control method
• No control loop compensation required
• Wide 4.5V to 35V input range
• 1.242V to V_INAdjustable output range
• High efficiency: 93%
• ± 1.3% (± 2% temperature) internal reference
• 100% duty cycle
• Maximum operating frequency > 1MHz
• Current limit protection
• MSOP - 8

illustrate

The LM3485 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop small, low cost, swapping buck regulators for a wide range of applications. The hysteresis control architecture is a simple design that controls the stability of the loop without any use of external components, a wide variety of concerns. The PFET architecture also allows low component count and ultra-low dropout 100% duty cycle operation. Another benefit is high efficiency at light loads without increasing the output ripple of the operation.

The current limit protection function works by measuring the R of the PFET_DS（ON）voltage, thus eliminating the need for a sense resistor. During the cycle-by-cycle current limit, an adjustable resistor ensures safe operation over the output current range.

apply

• Stb
• DSL/cable modem
• PC / IA
• Automatic computer
• LCD
• Battery-powered portable applications
• Distributed power systems
• Always on power