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 100 kHz and 1 MHz 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 5 µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.

Features

  • LM3478Q-Q1 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 1-A 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

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Parametrics Compare all products in Boost Controller (External Switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switch Current Limit (Typ) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Performance Features
Iout (Max) (A)
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
LM3478 LM3017 LM3481 LM3481-Q1 LM3488 LM5022
2.97     5     2.97     2.97     2.97     6    
40     18     48     48     40     60    
1.26     6     1.275     1.275     1.26     1.25    
500     20     500     500     500      
10     1     10     10     10     10    
1     1     1     1     1     1    
100     400     100     100     100     170    
1000     400     1000     1000     1000     1000    
2.7     0.001     3.7     3.7     2.7     3.5    
Adjustable Current Limit
Enable
Frequency Synch
Light Load Efficiency Mode
Pre-Bias Start-Up    
Enable
Load Disconnect    
UVLO Adjustable
Adjustable Current Limit
Enable
Frequency Synch
Light Load Efficiency Mode
Pre-Bias Start-Up    
UVLO Adjustable
Adjustable Current Limit
Enable
Frequency Synch
Light Load Efficiency Mode
Pre-Bias Start-Up    
Adjustable Current Limit
Enable
Frequency Synch
Light Load Efficiency Mode
Pre-Bias Start-Up    
UVLO Adjustable
Enable
Frequency Synch    
10     1     10     10     10     10    
100     85     85     85     100     90    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Catalog     Automotive     Catalog     Catalog    
SOIC
VSSOP    
WQFN     VSSOP     VSSOP     VSSOP     VSSOP    

Related end equipment

  • Distributed Power Systems
  • Battery Chargers
  • Offline Power Supplies
  • Telecom Power Supplies
  • Automotive Power Systems
  • Wide Supply Voltage Range of 2.97 V to 40 V
  • 100-kHz to 1-MHz Adjustable Clock Frequency
  • ±2.5% (Over Temperature) Internal Reference
  • 10-µA Shutdown Current (Over Temperature)

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WEBENCH® Designer LM3478

  Min   Max Range
Vin  V 2.97 to 40.0V
Vout  V 1.26 to 300.0V
Iout  A ≤ 20A
Ambient Temp  °C -40 to 125°C


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