LM3478 2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller | TI.com

LM3478 (ACTIVE)

2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller

2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller - LM3478
 

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

  • 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
  • Create a Custom Design Using the LM3478 with the WEBENCH Power Designer

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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)
Features
Iout (Max) (A)
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
LM3478 LM3017 LM3481 LM3481-Q1 LM3488 LM5022 TPS40210
2.97     5     2.97     2.97     2.97     6     4.5    
40     18     48     48     40     60     52    
1.26     6     1.275     1.275     1.26     1.25     5    
500     20     500     500     500     300     300    
10     1     10     10     10     10     6    
1     1     1     1     1     1     1    
100     400     100     100     100     170     35    
1000     400     1000     1000     1000     2200     1000    
2.7     1.4     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    
Enable
Frequency Synchronization    
10     1     10     10     10     10     6    
100     85     85     85     100     90     95    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Catalog     Automotive     Catalog     Catalog     Catalog    
SOIC
VSSOP    
WQFN     VSSOP     VSSOP     VSSOP     VSSOP     MSOP-PowerPAD
VSON    
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WEBENCH® Power Designer is now even easier to use. Learn more.

WEBENCH® Designer LM3478

  Min   Max Range
Vin  V 2.97 to 40.0V
Vout  V 1.26 to 300V
Iout  A ≤ 20A
Ambient Temp  °C -40 to 125°C


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