4-A, 6-A, 5.7-kVRMS Isolated Dual-Channel Gate Driver with Enable - UCC21521


4-A, 6-A, 5.7-kVRMS Isolated Dual-Channel Gate Driver with Enable



The UCC21521 is an isolated dual-channel gate driver with 4-A source and 6-A sink peak current. It is designed to drive power MOSFETs, IGBTs, and SiC MOSFETs up to 5-MHz with best-in-class propagation delay and pulse-width distortion.

The input side is isolated from the two output drivers by a 5.7-kVRMS reinforced isolation barrier, with a minimum of 100-V/ns common-mode transient immunity (CMTI). Internal functional isolation between the two secondary-side drivers allows a working voltage of up to 1500 VDC.

This driver can be configured as two low-side drivers, two high-side drivers, or a half-bridge driver with programmable dead time (DT). The EN pin pulled low shuts down both outputs simultaneously and allows for normal operation when left open or pulled high. As a fail-safe measure, primary-side logic failures force both outputs low.

The device accepts VDD supply voltages up to 25 V. A wide input VCCI range from 3 V to 18 V makes the driver suitable for interfacing with both analog and digital controllers. All the supply voltage pins have under voltage lock-out (UVLO) protection.

With all these advanced features, the UCC21521 enables high efficiency, high power density, and robustness in a wide variety of power applications.


  • Universal: Dual Low-Side, Dual High-Side or Half-Bridge Driver
  • Operating Temperature Range –40 to +125°C
  • Switching Parameters:
    • 19-ns Typical Propagation Delay
    • 10-ns Minimum Pulse Width
    • 5-ns Maximum Delay Matching
    • 5-ns Maximum Pulse-Width Distortion
  • Common-Mode Transient Immunity (CMTI) Greater than 100 V/ns
  • Surge Immunity up to 12.8 kV
  • Isolation Barrier Life >40 Years
  • 4-A Peak Source, 6-A Peak Sink Output
  • TTL and CMOS Compatible Inputs
  • 3-V to 18-V Input VCCI Range to Interface with Both Digital and Analog Controllers
  • Up to 25-V VDD Output Drive Supply
    • 5-V, 8-V, 12-V VDD UVLO Options
  • Programmable Overlap and Dead Time
  • Rejects Input Pulses and Noise Transients Shorter than 5 ns
  • Fast Enable for Power Sequencing
  • Wide Body SOIC-16 (DW) Package
  • Safety-Related and Regulatory Approvals:
    • 8000-VPK Isolation per DIN V VDE V 0884-10 (VDE V0884-10):2006-12
    • 5700-VRMS Isolation for 1 Minute per UL 1577
    • CSA Component Acceptance Notice 5A, IEC 60950-1 and IEC 60601-1 End Equipment Standards (Planned)
    • CQC Certification per GB4943.1-2011 (Planned)

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Parametrics Compare all products in Isolated Gate Driver

Isolation Rating (Vrms)
DIN V VDE V 0884-10 Transient Overvoltage Rating (Vpk)
DIN V VDE V 0884-10 Working Voltage (Vpk)
Number of Channels (#)
Power Switch
Enable/Disable Function
Output VCC/VDD (Max) (V)
Output VCC/VDD (Min) (V)
Input VCC (Min) (V)
Input VCC (Max) (V)
Peak Output Current (A)
Prop Delay (ns)
Prop Delay (Max) (ns)
Operating Temperature Range (C)
Package Group
UCC21521 UCC21521A UCC21521C UCC20520 UCC21520
5700    5700    5700    5700    5700   
8000    8000    8000    8000    8000   
2121    2121    2121    2121    2121   
2    2    2    2    2   
Enable    Enable    Enable    DISABLE    Disable   
25    25    25    25    25   
9.2    6.5    14.7    9.2    9.2   
3    3    3    3    3   
18    18    18    18    18   
6    6    6    6    6   
19    19    19    19    19   
30    30    30    30    30   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125