LM3481 2.97V to 48V High-Efficiency Controller for Boost, SEPIC and Flyback | TI.com

LM3481 (ACTIVE)

2.97V to 48V High-Efficiency Controller for Boost, SEPIC and Flyback

2.97V to 48V High-Efficiency Controller for Boost, SEPIC and Flyback - LM3481
 

Description

The LM3481 device is a versatile Low-Side N-FET high-performance controller for switching regulators. The device is suitable for use in topologies requiring a low-side FET, such as boost, flyback, SEPIC, and so on. The LM3481 device can be operated at extremely high switching frequencies to reduce the overall solution size. The switching frequency of the LM3481 device can be adjusted to any value between 100kHz and 1MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed with a single external resistor.

The LM3481 device has built-in protection features such as thermal shutdown, short-circuit protection and overvoltage protection. 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

  • LM3481QMM are Automotive-Grade Products
    That are AEC-Q100 Grade 1 Qualified (–40°C to
    +125°C Operating Junction Temperature)
  • 10-Lead VSSOP Package
  • 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 Softstart
  • Current Mode Operation
  • Adjustable Undervoltage Lockout With Hysteresis
  • Pulse Skipping at Light Loads
  • Key Specifications
    • Wide Supply Voltage Range of 2.97 V to 48 V
    • 100-kHz to 1-MHz Adjustable and Synchronizable
      Clock Frequency
    • ±1.5% (Over Temperature) Internal
      Reference
    • 10-µA Shutdown Current (Over Temperature)

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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
LM3481 LM3017 LM3478 LM3488 LM5022 TPS40210
2.97     5     2.97     2.97     6     4.5    
48     18     40     40     60     52    
1.275     6     1.26     1.26     1.25     5    
500     20     500     500     300     300    
10     1     10     10     10     6    
1     1     1     1     1     1    
100     400     100     100     170     35    
1000     400     1000     1000     2200     1000    
3.7     1.4     2.7     2.7     3.5      
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
UVLO Adjustable    
Enable
Load Disconnect    
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up    
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     6    
85     85     100     100     90     95    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
VSSOP     WQFN     SOIC
VSSOP    
VSSOP     VSSOP     MSOP-PowerPAD
VSON    

Other qualified versions of LM3481

Version Part Number Definition
Automotive LM3481-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
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  Min   Max Range
Vin  V 2.97 to 48.0V
Vout  V 1.26 to 300V
Iout  A ≤ 40A
Ambient Temp  °C -40 to 125°C


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