| Part Number(s) (NSID) |
Top View | Type | Pins | MSL Rating | Peak Reflow | RoHS Status |
CAD Symbols | Models | Package Marking Format |
|---|---|---|---|---|---|---|---|---|---|
| LM3485MM/NOPB LM3485MM |
 |
MINI SOIC | 8 | 1 1 |
260 260 |
Detail | Download | N/A |
ZXTT S29B |
| LM3485MMX/NOPB LM3485MMX |
|
MINI SOIC | 8 | 1 1 |
260 260 |
Detail | Download | N/A |
ZXTT S29B |
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 ultra-low 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 PFET’s RDS(ON), 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.
| • | Set-Top Box |
| • | DSL/Cable Modem |
| • | PC/IA |
| • | Auto PC |
| • | TFT Monitor |
| • | Battery Powered Portable Applications |
| • | Distributed Power Systems |
| • | Always On Power |
| • | Easy to use control methodology |
| • | No control loop compensation required |
| • | 4.5V to 35V wide input range |
| • | 1.242V to VIN adjustable output range |
| • | High Efficiency 93% |
| • | ±1.3% (±2% over temp) internal reference |
| • | 100% duty cycle |
| • | Maximum operating frequency > 1MHz |
| • | Current limit protection |
| • | MSOP-8 |
Diagrams
Typical Application
|
Block Diagram
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Typical Performance  source：ShenZhen henlito electronic co.,ltd.
web:www.henlito.com |
