7.5-48V Wide Vin, 650mA Constant On-Time Synchronous Buck Regulator - LM25017

LM25017 (ACTIVE)

7.5-48V Wide Vin, 650mA Constant On-Time Synchronous Buck Regulator

Description

The LM25017 device is a 48-V, 650-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant on-time (COT) control scheme employed in the LM25017 device requires no loop compensation, provides excellent transient response, and enables very high step-down ratios. The on-time varies inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high voltage startup regulator provides bias power for internal operation of the IC and for integrated gate drivers.

A peak current limit circuit protects against overload conditions. The undervoltage lockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independently programmed. Other protection features include thermal shutdown and bias supply undervoltage lockout (VCC UVLO).

The LM25017 device is available in WSON-8 and HSOP-8 plastic packages.

Features

  • Wide 7.5-V to 48-V Input Range
  • Integrated 650-mA High-Side and
    Low-Side Switches
  • No Schottky Diode Required
  • Constant On-Time Control
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Nearly Constant Operating Frequency
  • Intelligent Peak Current Limit
  • Adjustable Output Voltage from 1.225 V
  • Precision 2% Feedback Reference
  • Frequency Adjustable to 1 MHz
  • Adjustable Undervoltage Lockout (UVLO)
  • Remote Shutdown
  • Thermal Shutdown
  • Packages:
    • WSON-8
    • HSOP-8

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Parametrics Compare all products in Step-Down (Buck) Converter

 
Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Topology
Switching Frequency (Max) (kHz)
Switch Current Limit (Typ) (A)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Soft Start
Compensation
Special Features
Brand
Control Mode
Vref Accuracy (Typ) (%)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM25017 LM5017 TPS54331 LM25010 TPS54328 TPS54327 TPS54239 TPS54228 TPS54229 TPS54227 TPS54427 TPS54428 TPS54239E
      1         1       1           1    
      6         4.5       4.5           4.5    
      42         23       18           23    
      2.5         0.76       0.76           0.76    
      37         7       7           7    
0.65     0.65     3     1     3     3     2     2     2     2     4     4     2    
      Buck         Buck       Buck           Buck    
      1000         600       650           600    
      1.25         3.1       3.3           3.1    
1.75     1.75     0.11     0.645     0.8     0.8     0.6     0.8     0.8     0.8     0.95     0.95     0.6    
90     90     90     99     90     90     90     90     90     90     95     95     90    
      Adjustable         Adjustable       Adjustable           Adjustable    
Not Needed     Not Needed     External     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed    
      Enable         Enable
Synchronous Rectification    
  Enable
Synchronous Rectification    
      Enable
Light Load Efficiency
Synchronous Rectification    
        SWIFT     SWIFT       SWIFT         SWIFT     SWIFT      
Constant on-time (COT)     Constant on-time (COT)     Current Mode     Constant on-time (COT)     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2     D-CAP2    
      2         2       2           2    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 125       -40 to 150     -40 to 125     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
8SO PowerPAD
8WSON    
8SO PowerPAD
8WSON    
8SO PowerPAD
8SOIC    
10WSON
14HTSSOP    
10VSON
8SO PowerPAD    
10VSON
8SO PowerPAD    
8SO PowerPAD     10VSON
8SO PowerPAD
8SOIC    
8SO PowerPAD     10VSON
8SO PowerPAD    
10VSON
8SO PowerPAD    
10VSON
8SO PowerPAD    
8SO PowerPAD    
1.25 | 1ku     1.57 | 1ku     0.60 | 1ku     0.95 | 1ku     0.75 | 1ku     0.73 | 1ku     0.73 | 1ku     0.63 | 1ku     1.17 | 100u     0.61 | 1ku     0.90 | 1ku     0.92 | 1ku     0.75 | 1ku    

Related end equipment

  • Industrial Equipment
  • Smart Power Meters
  • Telecommunication Systems
  • Isolated Bias Supply

All trademarks are the property of their respective owners.

WEBENCH® LM25017
    Min   Max   Range  
  Vin V    9.00 – 48.00V  
  Vout V    1.25 – 48.00V  
  Iout A    ≤ 0.65A  
  Ambient Temp °C    -40 – 125°C  
Footprint BOM Cost Efficiency
 
   
 
 
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Companion parts

Part # Name Product Family Comments
LM5017   7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator   CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER    
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