1 Features

• Universal: dual low-side, dual high-side or halfbridge

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

– 6-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 certifications:

– 8000-VPK reinforced isolation per DIN V VDE V

0884-11:2017-01

– 5700-VRMS Isolation for 1 minute per UL 1577

– CSA certification per IEC 60950-1, IEC

62368-1, IEC 61010-1 and IEC 60601-1 end

equipment standards

– CQC certification per GB4943.1-2011

2 Applications

• Isolated converters in offline AC-to-DC power

supplies

• Server, telecom, IT, and industrial infrastructures

• Motor drive and DC-to-AC solar inverters

• LED lighting

• Inductive heating

• Uninterruptible power supply (UPS)

3 Description

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.

Every 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.