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)
Special Features
Iout (Max) (A)
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
Approx. Price (US$)
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    300   
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 Synchronization
Light Load Efficiency
Pre-Bias Start-Up   
Enable
Load Disconnect   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up   
Enable
Frequency Synchronization
UVLO Adjustable   
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   
0.80 | 1ku    0.95 | 1ku    0.80 | 1ku    0.96 | 1ku    0.80 | 1ku    0.90 | 1ku   
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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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