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
• 4mV/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
• AEC-Q100 qualified with the following results:
– Device temperature Grade 1: –40°C to 125°C
ambient operating temperature
• Functional Safety-Capable
– Documentation available to aid functional safety
system design
• SSOP-16 (5.85mm × 7.50mm) package
• >8.2mm clearance and creepage

2 Applications
• Traction Inverters
• HEV/EV OBC and DC/DC converter
• Battery-Management Systems (BMS)
• Bias power for isolated measurements
• Bias power for isolated signal chain

3 Description
The 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.
The 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
SSOP (5.85mm × 7.50mm) package with
2.65mm height and > 8.2mm clearance and
creepage.