LM3485 Series
4.5-35V, Hysteretic Non-Synchronous PFET Buck Controller
Manufacturer: Texas Instruments
Catalog
4.5-35V, Hysteretic Non-Synchronous PFET Buck Controller
| Part | Clock Sync | Number of Outputs | Topology | Synchronous Rectifier | Function | Output Phases | Package / Case | Package / Case [custom] | Package / Case | Duty Cycle (Max) [Max] | Mounting Type | Operating Temperature [Min] | Operating Temperature [Max] | Voltage - Supply (Vcc/Vdd) [Min] | Voltage - Supply (Vcc/Vdd) [Max] | Output Type | Output Configuration | Grade | Qualification | Supplied Contents | Utilized IC / Part | Features | Current - Output / Channel | Outputs and Type | Voltage - Output | Voltage - Input [Min] | Voltage - Input [Max] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Texas Instruments | 1 | Buck | Step-Down | 1 | 8-MSOP 8-TSSOP | 0.118 in | 3 mm | 100 % | Surface Mount | -40 °C | 125 ¯C | 4.5 V | 35 V | Transistor Driver | Positive | ||||||||||||
 Texas Instruments | 1 | Buck | Step-Down | 1 | 8-MSOP 8-TSSOP | 0.118 in | 3 mm | 100 % | Surface Mount | -40 °C | 125 ¯C | 4.5 V | 35 V | Transistor Driver | Positive | Automotive | AEC-Q100 | ||||||||||
 Texas Instruments | 1 | Buck | Step-Down | 1 | 8-MSOP 8-TSSOP | 0.118 in | 3 mm | 100 % | Surface Mount | -40 °C | 125 ¯C | 4.5 V | 35 V | Transistor Driver | Positive | ||||||||||||
Texas Instruments | 1 | Buck | Step-Down | 1 | 8-MSOP 8-TSSOP | 0.118 in | 3 mm | 100 % | Surface Mount | -40 °C | 125 ¯C | 4.5 V | 35 V | Transistor Driver | Positive | ||||||||||||
Texas Instruments | Board(s) | LM3485 | Dimmable | 1.4 A | 1 Non-Isolated Output | 30 VDC | 5 V | 30 V |
Key Features
• Easy-to-Use Control MethodologyNo Control-Loop Compensation Required4.5-V to 35-V Wide Input Range1.242-V to VINAdjustable Output RangeHigh Efficiency 93%±1.3% (±2% Over Temp) Internal Reference100% Duty CycleMaximum Operating Frequency > 1 MHzCurrent Limit ProtectionEasy-to-Use Control MethodologyNo Control-Loop Compensation Required4.5-V to 35-V Wide Input Range1.242-V to VINAdjustable Output RangeHigh Efficiency 93%±1.3% (±2% Over Temp) Internal Reference100% Duty CycleMaximum Operating Frequency > 1 MHzCurrent Limit Protection
Description
AI
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.
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.