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[FAQ] UCC27511A: What is the difference between the Low Side Drivers UCC27511A and UCC27511? Improved Negative Input Voltage Handling capability

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Part Number: UCC27511A

Switch-Mode Power Supplies and Merchant DC-DC converter applications often require high current drive and hard switching to drive large loads. This hard switching of the power switches in combination with layout constraints often lead to noise in the system. This noise presents itself in the form of ground bounce and ringing at the driver's input/output given that power ground and controller ground are connected. Most gate drivers are already equipped to handle short negative pulses at the output stage through the internal FETs body diodes. However It is necessary to take precautions to prevent the overshoot and undershoot from damaging the driver's input. 

TI's UCC27511A solves this issue with its input capable of handling voltages up to -5V (independently of the supply voltage VDD) in addition to providing the same features as UCC27511. The pinout, available packages and parameter specifications are the same for both drivers. UCC27511A is an improved drop-in replacement for UCC27511 in noisy environments.

The added negative voltage handling capability feature increases the overall system robustness and provides designers with safety margin in the event of noisy conditions.

The table below provides a quick comparison between UCC27511A and UCC27511.

  UCC27511A UCC27511
Number of channels (#) 1 1
Power switch MOSFET MOSFET
Peak output current (A) 8 8
Input VCC (Min) (V) 4.5 4.5
Input VCC (Max) (V) 18 18
Rise time (ns) 9 9
Fall time (ns) 7 7
Input threshold CMOS CMOS
Prop delay (ns) 13 13
Features Split Output Split Output
Rating Catalog Catalog
Operating temperature range (C) -40 to 140 -40 to 140
Package Group SOT-23 | 6 SOT-23 | 6

For further information on gate drivers, please see

If you need assistance with the UCC27511A, please post a request on e2e.

-Mamadou Diallo