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


Functional Diagram


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.


  • 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

All trademarks are the property of their respective owners.


Vin (Min) (V) 3    
Vin (Max) (V) 65    
Vout (Min) (V) 3    
Vout (Max) (V) 100    
Regulated Outputs (#) 1    
Switching Frequency (Min) (kHz) 50    
Switching Frequency (Max) (kHz) 1000    
Iq (Typ) (mA) 4    
Features Enable^Frequency Synchronization^Phase Interleaving^Synchronous Rectification^UVLO Adjustable    
Duty Cycle (Max) (%) 100    
Operating Temperature Range (C) -40 to 125    
Rating Catalog    
Type Controller    
Package Group HTSSOP|20^HTSSOP|24    

Companion Products

Technical Documents

Datasheet (1)

Application notes (2)

User guides (3)

Selection guides (1)

White papers (4)

Other Products in Same Family

� Texas Instruments Inc. Privacy Terms