LM3481-Q1 48V Wide Vin High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters | TI.com

LM3481-Q1 (ACTIVE) 48V Wide Vin High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters

 

Recommended alternative parts

  • LM5155-Q1  - The device has the SAME FUNCTIONALITY as the compared device, but is not pin-for-pin equivalent and may not be parametrically equivalent.   For applications requiring lower quiescent current or higher efficiency
  • TPS40210-Q1  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Automotive 4.5V to 52V Wide Input Range Current Mode Boost Controller

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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Topology Option
  Min   Max Range
Vin  V 7 to 42V
Vout  V 1.225 to 30V
Iout  A 0 to 2.5A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Duty cycle (Max) (%) Operating temperature range (C) Rating Type Package Group
LM3481-Q1 Order now 2.97     48     1.275     500     1     100     1000     3.7     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
UVLO Adjustable    
85     -40 to 125     Automotive     Controller     VSSOP | 10    
LM25122-Q1 Order now 3     42     3     50     1     50     600     4     Enable
Frequency Synchronization
Phase Interleaving
Synchronous Rectification    
100     -40 to 125     Automotive     Controller     HTSSOP | 20    
LM3478 Order now 2.97     40     1.26     500     1     100     1000     2.7     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up    
100     -40 to 125     Catalog     Controller     SOIC | 8
VSSOP | 8    
LM3488 Order now 2.97     40     1.26     500     1     100     1000     2.7     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up    
100     -40 to 125     Catalog     Controller     VSSOP | 8    
LM5022-Q1 Order now 3     60     1.25     300     1     170     2200     3.5     Enable
Frequency Synchronization
UVLO Adjustable    
90     -40 to 125     Automotive     Controller     VSSOP | 10    
LM5122-Q1 Order now 3     65     3     100     1