LM5122 3-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capability | TI.com

LM5122 (ACTIVE)

3-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capability

 

Description

The LM5122 is a multi-phase capable synchronous boost controller intended for high-efficiency synchronous 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 by two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode-emulation mode also enables discontinuous-mode operation for improved efficiency at light load conditions.

An internal charge pump allows 100% duty cycle for high-side synchronous switch (bypass operation). A 180° phase shifted clock output enables easy multi-phase interleaved configuration. Additional features include thermal shutdown, frequency synchronization, hiccup-mode current limit, and adjustable line undervoltage lockout.

Features

  • Maximum Input Voltage: 65 V
  • Minimum Input Voltage: 3 V (4.5 V for Start-Up)
  • Output Voltage up to 100 V
  • Bypass (VOUT = VIN) Operation
  • 1.2-V Reference with ±1% Accuracy
  • Free-Run and Synchronizable Switching to 1 MHz
  • Peak-Current-Mode Control
  • Robust 3-A Integrated Gate Drivers
  • Adaptive Dead-Time Control
  • Optional Diode-Emulation Mode
  • Programmable Cycle-by-Cycle Current Limit
  • Hiccup-Mode Overload Protection
  • 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
  • Allows External VCC Supply
  • Inductor DCR Current Sensing Capability
  • Multi-phase Capability
  • Thermally Enhanced 20 or 24-Pin HTSSOP
  • Create a Custom Design Using the LM5122 With the WEBENCH® Power Designer

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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
LM5122 LM25122-Q1 LM3481 LM5020 LM5022 LM5121 LM5122-Q1 LM5122ZA LM5155 TPS40210
3     3     2.97     13     6     3     3     3     1.5     4.5    
65     42     48     100     60     65     65     65     45     52    
3     3     1.275     1.25     1.25     3     3     3     1.5     5    
100     50     500     300     300     100     100     100     300     300    
1     1     1     1     1     1     1     1     1     1    
50     50     100     175     170     50     50     50     100     35    
1000     600     1000     1000     2200     1000     1000     1000     2200     1000    
4     4     3.7     2     3.5     4     4     4     0.45      
Enable
Frequency Synchronization
Phase Interleaving
Synchronous Rectification
UVLO Adjustable    
Enable
Frequency Synchronization
Phase Interleaving
Synchronous Rectification    
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
UVLO Adjustable    
Enable
Frequency Synchronization
Pre-Bias Start-Up    
Enable
Frequency Synchronization
UVLO Adjustable    
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable    
Enable
Frequency Synchronization
Phase Interleaving
Synchronous Rectification
UVLO Adjustable    
Enable
Frequency Synchronization
Phase Interleaving
Synchronous Rectification
UVLO Adjustable    
Adjustable Current Limit
Frequency Synchronization
Power Good
UVLO Adjustable    
Enable
Frequency Synchronization    
100     100     85     80     90     100     100     100     93     95    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
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