LM5121 3-65V Wide Vin, Current Mode Synchronous Boost with Disconnection Switch Control | TI.com

LM5121 (ACTIVE)

3-65V Wide Vin, Current Mode Synchronous Boost with Disconnection Switch Control

 

Description

The LM5121 is a synchronous boost controller intended for high-efficiency, high-power boost regulator applications. The control method is based upon peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation.

The switching frequency is programmable up to 1 MHz. Higher efficiency is achieved using two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions.

The LM5121 provides disconnection switch control which completely disconnects the output from the input during an output short or a shutdown condition. During start-up sequence, inrush current is limited by the disconnection switch control.

An internal charge pump allows 100% duty cycle operation of the high-side synchronous switch (Bypass operation). Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.

Features

  • AEC-Q100 Qualified with the following results:
    • Device Temperature Grade 1: –40°C to +125°C
      Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C6
  • Maximum Input Voltage: 65 V
  • Min Input Voltage: 3.0 V (4.5 V for startup)
  • Output Voltage Up to 100 V
  • Bypass (VOUT = VIN) Operation
  • 1.2-V Reference with ±1.0% Accuracy
  • Free-Run/Synchronizable up to 1 MHz
  • Peak Current Mode Control
  • Robust Integrated 3-A Gate Drivers
  • Adaptive Dead-Time Control
  • Optional Diode Emulation Mode
  • Programmable Cycle-by-Cycle Current Limit
  • Programmable Line UVLO
  • Programmable Soft-Start
  • Thermal Shutdown Protection
  • Low Shutdown Quiescent Current: 9 µA
  • Programmable Slope Compensation
  • Programmable Skip Cycle Mode Reduces
    Standby Power
  • Supports External VCC Bias Supply Option
  • Load Disconnection in Shutdown Mode (True
    Shutdown)
  • Inrush Current Limiting
  • Hiccup Mode Short Circuit/Overload Protection
  • Circuit Breaker Function
  • Capable of Input Transient Suppression
  • Capable of Reverse Battery Protection
  • Thermally Enhanced 20-Pin HTSSOP

View more

Parametrics Compare all products in Boost controllers (external switch)

 
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
LM5121 LM25122-Q1 LM5020 LM5022 LM5122 LM5122-Q1 LM5122ZA
3     3     13     6     3     3     3    
65     42     100     60     65     65     65    
3     3     1.25     1.25     3     3     3    
100     50     300     300     100     100     100    
1     1     1     1     1     1     1    
50     50     175     170     50     50     50    
1000     600     1000     2200     1000     1000     1000    
4     4     2     3.5     4     4     4    
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable    
Enable
Frequency Synchronization
Phase Interleaving
Synchronous Rectification    
Enable
Frequency Synchronization
Pre-Bias Start-Up    
Enable
Frequency Synchronization
UVLO Adjustable    
Enable
Frequency Synchronization
Phase Interleaving
Synchronous Rectification
UVLO Adjustable    
Enable
Frequency Synchronization
Phase Interleaving
Synchronous Rectification
UVLO Adjustable    
Enable
Frequency Synchronization
Phase Interleaving
Synchronous Rectification
UVLO Adjustable    
100     100     80     90     100     100     100    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Automotive     Catalog     Catalog     Catalog     Automotive     Catalog    
Controller     Controller     Controller     Controller     Controller     Controller     Controller    
HTSSOP | 20     HTSSOP | 20     VSSOP | 10
WSON | 10    
VSSOP | 10     HTSSOP | 20
HTSSOP | 24    
HTSSOP | 20     HTSSOP | 24    

Design tool

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WEBENCH® Power Designer is now even easier to use. Try it now.

WEBENCH® Designer LM5121

  Min   Max Range
Vin  V 4.5 to 65.0V
Vout  V 4.5 to 100V
Iout  A ≤ 35A
Ambient Temp  °C -40 to 125°C


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