40V Wide Vin Low-Side N-Channel Controller for Switching Regulator - LM3478

LM3478 (ACTIVE)

40V Wide Vin Low-Side N-Channel Controller for Switching Regulator

Description

The LM3478 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478 can be adjusted to any value between 100kHz and 1MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.

The LM3478 has built in features such as thermal shutdown, short-circuit protection, over voltage protection, etc. Power saving shutdown mode reduces the total supply current to 5µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.

Features

  • LM3478Q in VSSOP-8 package is AEC-Q100 qualified and manufactured on an Automotive Grade Flow
  • 8-lead VSSOP-8 and SOIC-8 packages
  • Internal push-pull driver with 1A peak current capability
  • Current limit and thermal shutdown
  • Frequency compensation optimized with a capacitor and a resistor
  • Internal soft start
  • Current Mode Operation
  • Undervoltage Lockout with hysteresis

Key Specifications

  • Wide supply voltage range of 2.97V to 40V
  • 100kHz to 1MHz Adjustable clock frequency
  • ±2.5% (over temperature) internal reference
  • 10µA shutdown current (over temperature)

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Parametrics Compare all products in Step-Up (Boost) Controller

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Regulated Outputs (#)
Control Mode
Brand
Market Segment
Special Features
Duty Cycle (Max) (%)
Rating
Operating Temperature Range (C)
Topology
Pin/Package
Approx. Price (US$)
LM3478 LM3017 LM3481 LM3481-Q1 LM3488 LM5020 LM5022
2.95     5     2.97     2.97     2.95     13     6    
40     18     48     48     40     100     60    
1.26     6     1.275     1.275     1.26     1.25     1.25    
  20              
1     1     1     1     1       1    
1000     400     1000     1000     1000     1000     1000    
  0.001           2     3.5    
1     1     1     1     1     1     1    
  Current Mode           Current Mode     Current Mode    
SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER        
Industrial     Computing & Multimedia     Industrial       Industrial     Industrial     Automotive & Transportation
Industrial    
Enable     Enable
Load Disconnect    
Enable
Frequency Synchronization
Light Load Efficiency    
Enable
Frequency Synchronization
Light Load Efficiency    
Enable
Frequency Synchronization    
Enable
Frequency Synchronization
Pre-Bias Start-Up    
Adjustable UVLO
Enable
Frequency Synchronization    
  85     85     85     100     80     90    
Catalog     Catalog     Catalog     Automotive     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
Boost
Flyback
SEPIC    
Boost
Flyback
SEPIC    
Boost
Flyback
SEPIC    
Boost
Flyback
SEPIC    
Boost
Flyback
SEPIC    
Boost
Buck
Flyback
Forward
Inverting Buck-Boost    
Boost
SEPIC    
8SOIC
8VSSOP    
10WQFN     10VSSOP     10VSSOP     8VSSOP     10VSSOP
10WSON    
10VSSOP    
0.80 | 1ku     0.95 | 1ku     0.80 | 1ku     0.96 | 1ku     0.80 | 1ku     0.80 | 1ku     0.90 | 1ku    

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  • Automotive Power Systems

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Featured tools and software

WEBENCH® LM3478
    Min   Max   Range  
  Vin V    2.97 – 40.00V  
  Vout V    1.26 – 300.00V  
  Iout A    ≤ 20.00A  
  Ambient Temp °C    ≤ 100°C  
Footprint BOM Cost Efficiency
 
 
 
'U1 Rfb1 Rfb2 D1 M1 Rfadj L1 Rs1 Rsense Csense Cbyp Cin Cout Rcomp Ccomp Ccomp2 '
 
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