LM5085 4.5-75V Wide Vin, Constant On-Time Non-Synchronous PFET Buck Controller | TI.com

LM5085 (ACTIVE)

4.5-75V Wide Vin, Constant On-Time Non-Synchronous PFET Buck Controller

4.5-75V Wide Vin, Constant On-Time Non-Synchronous PFET Buck Controller - LM5085
 

Description

The LM5085 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, efficient buck regulator for a wide range of applications. This high voltage controller contains a PFET gate driver and a high voltage bias regulator which operates over a wide 4.5-V to 75-V input range. The constant on-time regulation principle requires no loop compensation, simplifies circuit implementation, and results in ultrafast load transient response. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The PFET architecture allows 100% duty cycle operation for a low dropout voltage. Either the RDS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.

Features

  • LM5085-Q1 is an Automotive Grade Product that
    is AEC-Q100 Grade 1 Qualified (–40°C to 125°C
    Operating Junction Temperature)
  • Wide 4.5-V to 75-V Input Voltage Range
  • Adjustable Current Limit Using RDS(ON) or a
    Current Sense Resistor
  • Programmable Switching Frequency to 1MHz
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Nearly Constant Operating Frequency with Line
    and Load Variations
  • Adjustable Output Voltage from 1.25 V
  • Precision ±2% Feedback Reference
  • Capable of 100% Duty Cycle Operation
  • Internal Soft-start Timer
  • Integrated High Voltage Bias Regulator
  • Thermal Shutdown
  • Package:
    • HVSSOP-8
    • VSSOP-8
    • WSON-8

View more

Parametrics Compare all products in Buck Controller (External Switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated Outputs (#)
Number of Phases
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Features
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
Control Mode
LM5085 LM25085 LM25085-Q1 LM25085A LM5085-Q1
4.5     4.5     4.5     4.5     4.5    
75     42     42     42     75    
1.25     1.25     1.25     0.9     1.25    
75     42     42     42     75    
10     10     10     10     10    
1     1     1     1     1    
1     1     1     1     1    
50     50     50     50     50    
1000     1000     1000     1000     1000    
1.3     1.25     1.25     1.25     1.3    
Adjustable Current Limit
Enable
Frequency Synchronization    
Adjustable Current Limit
Frequency Synchronization    
Adjustable Current Limit
Frequency Synchronization    
Adjustable Current Limit
Frequency Synchronization    
Adjustable Current Limit
Enable
Frequency Synchronization    
100     100     100     100     100    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Automotive     Catalog     Automotive    
MSOP-PowerPAD
VSSOP
WSON    
MSOP-PowerPAD
VSSOP
WSON    
MSOP-PowerPAD     MSOP-PowerPAD
VSSOP
WSON    
MSOP-PowerPAD    
Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)    

Other qualified versions of LM5085

Version Part Number Definition
Automotive LM5085-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
New!
WEBENCH® Power Designer is now even easier to use. Try it now.

WEBENCH® Designer LM5085

  Min   Max Range
Vin  V 4.5 to 75.0V
Vout  V 1.25 to 75V
Iout  A ≤ 10A
Ambient Temp  °C -40 to 125°C


Footprint BOM Cost Efficiency


Preview design