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 LM25010 LM5010 LM5010A LM5010A-Q1 LM5017 LM5160 LM5160A LM5160A-Q1
  1         1       1     1     1    
7.5     6     8     6     6     7.5     4.5     4.5     4.5    
48     42     75     75     75     100     65     65     65    
1.25     2.5     2.5     2.5     2.5     1.25     2     2     2    
40     37     70     70     70     90     60     60     60    
0.65     1     1     1     1     0.65     1.5     1.5     1.5    
Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck    
1000     1000     1000     1000     1000     1000     1000     1000     1000    
1.3     1.25     1.25     1.25     1.25     1.3     2.5     2.5     2.5    
1.75     0.645     0.65     0.65     0.65     1.75     2.3     2.3     2.3    
90     99     99     99     99     90     92     92     92    
None     Adjustable     Adjustable     Adjustable     Adjustable       Adjustable     Adjustable     Adjustable    
Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed     Not Needed    
Adjustable UVLO
Synchronous Rectification    
Enable     Enable     Enable     Enable     Adjustable UVLO
Synchronous Rectification    
Adjustable UVLO
Enable
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification    
Adjustable UVLO
Enable
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification    
Adjustable UVLO
Enable
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification    
            Wide Vin     Wide Vin     Wide Vin    
Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)    
2     2     2     2     2     2     1     1     1    
Catalog     Catalog     Catalog     Catalog     Automotive     Catalog     Catalog     Catalog     Automotive    
-40 to 125     -40 to 125     -40 to 125     -40 to 150     -40 to 125
-40 to 150    
  -40 to 125     -40 to 125     -40 to 125    
8SO PowerPAD
8WSON    
10WSON
14HTSSOP    
10WSON
14HTSSOP    
10WSON
14HTSSOP    
14HTSSOP     8SO PowerPAD
8WSON    
12WSON     12WSON
14HTSSOP    
14HTSSOP    
1.25 | 1ku     0.95 | 1ku     1.43 | 1ku     1.47 | 1ku     1.75 | 1ku     1.57 | 1ku     1.80 | 1ku     1.80 | 1ku      
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WEBENCH® LM25017
    Min   Max   Range  
  Vin V 9.0 to 48.0V  
  Vout V 1.25 to 48.0V  
  Iout A ≤ 0.65A  
  Ambient Temp °C -40 to 125°C  
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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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