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Updated at 17/06/2025 10:30:15(UTC+8)

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Description

Description
The LM3485 is a high-efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, low-cost, 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 ultralow dropout, 100% duty cycle operation. Another benefit is high efficiency operation at light loads without an increase in output ripple.
Current limit protection is provided by measuring the voltage across the RDS(ON) of the PFET, thus eliminating the need for a sense resistor. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents.
Features
• Easy-to-Use Control Methodology
• No Control-Loop Compensation Required
• 4.5-V to 35-V Wide Input Range
• 1.242-V to VIN Adjustable Output Range
• High Efficiency 93%
• ±1.3% (±2% Over Temp) Internal Reference
• 100% Duty Cycle
• Maximum Operating Frequency > 1 MHz
• Current Limit Protection
Applications
• Set-Top Box
• DSL or Cable Modem
• PC/IA
• Auto PC
• TFT Monitor
• Battery-Powered Portable Applications
• Distributed Power Systems
• Always On Power

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LM3485MM Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Surface Mount
Number of Pins	8 Pin
Case/Package	VSSOP-8
Frequency	1 MHz
Number of Outputs	1 Output
Input Voltage (DC)	-300 mV
Output Voltage	1.242V ~ 35V
Output Current	4 A
Number of Channels	1 Channel
Number of Positions	8 Position
Power Dissipation	417 mW
Quiescent Current	250 µA
Number of Regulated Outputs	1 Output
Switching Frequency	1 MHz
Topology	Buck
Duty Cycle	100 %
Input Voltage (Max)	36 V
Input Voltage (Min)	4.5 V
Output Voltage (Min)	1.242 V
Output Current (Max)	0.44 A
Maximum Duty Cycle	1
Operating Temperature (Max)	125 ℃
Operating Temperature (Min)	-40 ℃
Power Dissipation (Max)	417 mW
Supply Voltage	4.5V ~ 35V
Supply Voltage (Max)	35 V
Supply Voltage (Min)	4.5 V
Input Voltage	4.5V ~ 35V
	Show
Operating Temperature	-40℃ ~ 125℃
Product Lifecycle Status	Active
Packaging	Tape & Reel (TR)
RoHS	Non-Compliant
Lead-Free Status	Contains Lead
REACH SVHC Compliance	No SVHC
REACH SVHC Compliance Edition	2015/06/15

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