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-32 Class B emission
• Strong magnetic fields immunity
• Overload and short circuit protection
• Thermal shutdown
• Low inrush current soft-start
• Enable pin with fault reporting mechanism
• Extended temperature range: –40°C to 125°C
• SSOP-16 (5.85mm × 7.50mm) package
• >8.2mm clearance and creepage

2 Applications
• ESS - Battery Management system
• Smart Meter
• Solar Inverter
• Bias power for isolated measurements
• Bias power for isolated signal chain

3 Description
The UCC33421 is an industrial 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 features a proprietary transformer
architecture that achieves a 5kVRMS isolation rating,
while simultaneously supporting low EMI and
excellent load regulation.
The UCC33421 integrates protection features for
increased system robustness such as enable pin with
fault reporting mechanism, short circuit protection and
thermal shutdown.
The UCC33421 comes in a miniaturized, low-profile
SSOP (5.85mm × 7.50mm) package with 2.65mm
height and > 8.2mm clearance and creepage.