High Voltage 1A Peak Half Bridge Gate Driver - LM5109B


High Voltage 1A Peak Half Bridge Gate Driver


Recommended alternative parts

  • LM5102  -  Has Programmable Rising Edge Delay
  • LM5104  -  Single PWM Input, Has Adaptive Deadtime With Programmable Delay


The LM5109B device is a cost-effective, high-voltage gate driver designed to drive both the high-side and the low-side N-channel MOSFETs in a synchronous buck or a half-bridge configuration. The floating high-side driver is capable of working with rail voltages up to 90 V. The outputs are independently controlled with cost-effective TTL and CMOS-compatible input thresholds. The robust level shift technology operates at high speed while consuming low power and providing clean level transitions from the control input logic to the high-side gate driver. Undervoltage lockout is provided on both the low-side and the high-side power rails. The device is available in the 8-pin SOIC and thermally-enhanced 8-pin WSON packages.


  • Drives Both a High-Side and Low-Side N-Channel MOSFET
  • 1-A Peak Output Current (1.0-A Sink and 1.0-A Source)
  • Inputs Compatible With Independent TTL and CMOS
  • Bootstrap Supply Voltage to 108-V DC
  • Fast Propagation Times (30 ns Typical)
  • Drives 1000-pF Load With 15-ns Rise and Fall Times
  • Excellent Propagation Delay Matching (2 ns Typical)
  • Supply Rail Undervoltage Lockout
  • Low Power Consumption
  • 8-Pin SOIC and Thermally-Enhanced 8-Pin WSON Package

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Parametrics Compare all products in Half-bridge Driver

Number of Channels (#)
Power Switch
Bus Voltage (V)
Peak Output Current (A)
Input VCC (Min) (V)
Input VCC (Max) (V)
Rise Time (ns)
Fall Time (ns)
Prop Delay (ns)
Iq (uA)
Input Threshold
Channel Input Logic
Negative Voltage Handling at HS Pin (V)
Operating Temperature Range (C)
Package Group
LM5109B LM5102 LM5104
2    2    2   
90    100    100   
1    2    2   
8    9    9   
14    14    14   
15    10    10   
15    10    10   
25    35    35   
10    10    10   
TTL    TTL    TTL   
TTL    TTL    TTL   
-1    -1    -1   
N/A    N/A    N/A   
Catalog    Catalog    Catalog   
-40 to 125    -40 to 125    -40 to 125   

Other qualified versions of LM5109B

Version Part Number Definition
Automotive LM5109B-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects