1 Features
• 1.5W Maximum output power
• 4.5V to 5.5V input voltage operation range
• 5.0V, 5.5V regulated selectable output voltage
– 5.0V: 300mA available load current
• 0.5% typical load regulation
• 2mV/V typical line regulation
• Robust isolation barrier:
– Isolation rating: 5kVRMS
– Surge capability: 10.4kVPK
– Working voltage: 1700VPK
– ± 8KV IEC 61000-4-2 contact discharge
protection across isolation barrier
– 250V/ns common mode transient immunity
• Power dense isolated DC/DC module with
integrated transformer technology
• Adaptive spread spectrum modulation (SSM)
• Meets CISPR-25 Class 5 emission
• Strong magnetic fields immunity
• Overload and short circuit protection
• Thermal shutdown
• Low inrush current soft-start
• Enable pin with fault reporting mechanism
• Functional Safety-Capable
• Planned Safety-related certifications:
– Reinforced isolation per DIN EN IEC 60747-17
(VDE 0884-17)
– 5kVRMS isolation for 1 minute per UL 1577 /
CSA
• AEC-Q100 qualified with the following results:
– Device temperature Grade 1: –40°C to 125°C
ambient operating temperature
• SOIC-16 (5.85mm × 7.50mm) package

2 Applications
• Battery-Management Systems (BMS)
• HEV/EV OBC and DC/DC converter
• Traction Inverters
• Isolated bias power for digital isolators
• Isolated bias power for RS-485, RS-422 and CAN

3 Description
UCC33421-Q1 is an automotive qualified DC/DC
power module with integrated transformer technology
designed to provide 1.5W of isolated output power.
It can support an input voltage operation range of
4.5V to 5.5V and regulate 5.0V output voltage with a
selectable headroom of 5.5V.
UCC33421-Q1 features a proprietary transformer
architecture that achieves a 5kVRMS isolation rating,
while simultaneously supporting low EMI and
excellent load regulation.
The UCC33421-Q1 integrates protection features for
increased system robustness such as enable pin with
fault reporting mechanism, short circuit protection and
thermal shutdown.
The UCC33421-Q1 comes in a miniaturized, lowprofile
solution SOIC (5.85mm × 7.50mm) package
with 2.65mm height and > 8.2mm creepage and
clearance