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 Isolated DC/DC Converter

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switching Frequency (Max) (kHz)
Soft Start
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Topology
Approx. Price (US$)
LM25017 LM25010 LM5007 LM5010 LM5010A LM5010A-Q1 LM5017 LM5160-Q1 LM5160A
7.5     6     9     8     6     6     7.5     4.5     4.5    
48     42     75     75     75     75     100     65     65    
1.25     2.5     2.5     2.5     2.5     2.5     1.25     2     2    
40     37     73     70     70     70     90     60     60    
1000     1000     800     1000     1000     1000     1000     1000     1000    
None     Adjustable     None     Adjustable     Adjustable     Adjustable       Adjustable     Adjustable    
Adjustable UVLO
Synchronous Rectification    
Enable     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    
Catalog     Catalog     Catalog     Catalog     Catalog     Automotive     Catalog     Automotive     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 150     -40 to 125
-40 to 150    
  -40 to 125     -40 to 125    
8SO PowerPAD
8WSON    
10WSON
14HTSSOP    
8VSSOP
8WSON    
10WSON
14HTSSOP    
10WSON
14HTSSOP    
14HTSSOP     8SO PowerPAD
8WSON    
14HTSSOP     12WSON
14HTSSOP    
Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck
Inverting Buck-Boost    
Buck    
1.25 | 1ku     0.95 | 1ku     1.30 | 1ku     1.43 | 1ku     1.47 | 1ku     1.75 | 1ku     1.57 | 1ku     2.12 | 1ku     1.80 | 1ku    
WEBENCH® LM25017
    Min   Max   Range  
  Vin V V    9.00 – 48.00V  
  Vout V    1.25 – 48.00V  
  Iout A    ≤ 0.65A  

  Use Isolated Output?     

  Ambient Temp °C    ≤ 100°C  
   
Footprint BOM Cost Efficiency
 
 
 
'U1 Cb Cbyp Ron Ruv1 Ruv2 L1 Rfbb Rfbt Cff Rseries Cout Cin '
 
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