UCC12040 500mW, high efficiency 3kVrms isolated DC-DC converter | TI.com

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500mW, high efficiency 3kVrms isolated DC-DC converter



UCC12040 is a DC/DC converter with 3-kVRMS basic isolation rating designed to provide efficient, isolated power to isolated circuits that require a bias supply with a well-regulated output voltages. The device integrates a transformer and DC/DC controller with a proprietary architecture to provide 500 mW (typical) of isolated power with high efficiency and low EMI.

The UCC12040 integrates protection features for increased system robustness. The device also has an enable pin, synchronization capability, and regulated 5-V or 3.3-V output options with headroom. The UCC12040 is a low-profile, miniaturized solution offered in a wide-body SOIC package with 2.65-mm height (typical).


  • High-efficiency DC-DC converter with integrated transformer technology
  • Meets CISPR32 Class B EMI limits without ferrite beads across entire load range on a 2-layer PCB
  • Robust isolation barrier:
    • Isolation rating: 3 kVRMS
    • Surge capability: 8 kVPK
    • Working voltage: 800 VRMS
    • CMTI (typical): ±100 V/ns
  • Output power (typical): 500-mW
  • Regulated 5.0-V or 3.3-V output with selectable 400-mV headroom voltage to power an LDO
  • Input voltage: 4.5 V to 5.5 V
  • Short circuit recovery
  • Thermal shutdown
  • 16-pin wide-body SOIC package with > 8-mm creepage and clearance
  • Extended temperature range: –40ºC to 125ºC
  • Planned safety-related certifications:
    • 3000-VRMS isolation for 1 minute per UL 1577
    • CSA certification per IEC 60950-1, IEC 62368- 1 and IEC 60601-1 end equipment standards
    • CQC approval per GB4943.1-2011

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Part number Order Vin (Max) (V) Vin (Min) (V) Iout (Max) (A) Vout (Min) (V) Vout (Max) (V) Features Operating temperature range (C) Approx. price (US$) Regulated outputs (#) Package type
UCC12040 Order now 5.5     4.5     0.1     3.3     5.4     Regulated
Single Output
-40 to 125     2.77 | 1ku     1     Leaded    
UCC12050 Order now 5.5     4.5     0.1     3.3     5.4     Regulated
Single Output
-40 to 125     3.43 | 1ku     1     Leaded