UCC33020QRAQRQ1: TI Automotive Isolated DC/DC Module

Designed as a highly integrated automotive isolated DC/DC power module, the UCC33020QRAQRQ1 is a member of Texas Instruments' UCC33020-Q1 family of isolated DC/DC modules featuring proprietary integrated transformer technology[reference:0]. Categorized as an AEC-Q100 Grade 1 qualified isolated power solution, this device is available in a miniaturized VSON-12 (RAQ) package measuring only 4.0mm × 5.00mm with a 1.00mm profile, delivering greater than 4.1mm clearance and creepage for reinforced isolation integrity[reference:1][reference:2]. By integrating the transformer and isolation barrier into a single chip-scale module, the UCC33020-Q1 enables automotive and industrial system designers to achieve isolated bias power with dramatically reduced board area and component count compared to discrete flyback or push-pull converter designs.

The core advantage of this isolated DC/DC module lies in its ultra-compact power density-delivering up to 1.0W of isolated output power from a 3.0V to 5.5V input voltage range, with a selectable regulated output of 5.0V or 5.5V[reference:3][reference:4]. At the 5.0V output setting, the device provides up to 200mA of available load current, with 0.5% typical load regulation and 4mV/V typical line regulation[reference:5][reference:6]. The proprietary transformer architecture achieves a 3kVrms isolation rating while simultaneously supporting low EMI and excellent load regulation, making the UCC33020-Q1 particularly well-suited for space-constrained automotive applications where board area and thermal performance are critical design constraints[reference:7].

At the heart of the UCC33020-Q1 is a high-efficiency, low-emissions isolated DC/DC converter with adaptive spread spectrum modulation (SSM) that meets CISPR-25 Class 5 emission standards[reference:8]. The device employs hysteretic control to regulate the output voltage between upper and lower bands, ensuring tight output regulation without the need for external compensation components[reference:9]. The integrated isolation barrier provides a robust 3kVrms isolation rating, 6.5kV_PK surge capability, 1159V_PK working voltage, and 200V/ns common mode transient immunity, enabling reliable operation in high-noise automotive environments[reference:10][reference:11].

The UCC33020-Q1 is equipped with comprehensive protection and diagnostic features as standard configurations. The device includes an EN/FLT pin that serves as both a multi-function enable input and an output fault pin-connected to a microcontroller through an 18kΩ or larger pull-up resistor, this pin enables system-level fault reporting for increased system robustness[reference:12]. Full protection features include input under-voltage lockout (UVLO), input over-voltage lockout, output under-voltage protection, over-load and short-circuit protection, thermal shutdown, and low inrush current soft-start[reference:13][reference:14]. The device is also Functional Safety-Capable, with documentation available to aid functional safety system design[reference:15].

The UCC33020QRAQRQ1 variant operates from a 3.0V to 5.5V input voltage range, with the secondary-side isolated output voltage rated for up to 5.7V and the SEL pin input voltage rated for up to 5.7V[reference:16]. Its operating temperature range covers ‑40°C to 125°C for the AEC-Q100 Grade 1 temperature grade, ensuring stable performance under the harsh environmental conditions typical of automotive under-hood and powertrain applications[reference:17]. Output power derates with ambient temperature: the device delivers 1.0W at 25°C–85°C, 0.7W at 105°C, and 0.4W at 125°C when operating from a 5.0V input with 5.0V output; from a 3.3V input, output power is 0.5W at 25°C–85°C, 0.35W at 105°C, and 0.2W at 125°C[reference:18]. The device is planned for certification to DIN EN IEC 60747-17 (VDE 0884-17), UL 1577/CSA component recognition, and IEC 62368-1 and IEC 60601-1 standards[reference:19]. The component complies with RoHS environmental directives and is REACH SVHC compliant.

Product variant comparison - The UCC33020 family is offered in multiple orderable variants that differ primarily in automotive qualification and temperature grade. The UCC33020-Q1 variant (ordering code UCC33020QRAQRQ1) carries the AEC-Q100 Grade 1 automotive qualification with an ambient operating temperature range of –40°C to 125°C, making it suitable for demanding automotive applications such as BMS, HEV/EV OBC, and DC/DC converters[reference:20]. The UCC33020 (non-Q1) variant is the industrial-grade version, offering similar electrical performance without the automotive qualification, suitable for industrial isolated bias applications where AEC-Q100 compliance is not required. Both variants share the same VSON-12 (4.0mm × 5.00mm) package and integrated transformer technology. The following table summarises the key differentiators among UCC33020 orderable variants:

For replacement considerations, the UCC33020QRAQRQ1 is the automotive-qualified variant of the UCC33020 family, and the industrial-grade UCC33020 offers a cost-optimized alternative for applications that do not require AEC-Q100 compliance. For designs requiring higher output power or different input voltage ranges, TI's broader UCC33xxx family includes the UCC33410 and UCC33420, which share the same integrated transformer technology platform. All UCC33020 variants share the same VSON-12 footprint, enabling straightforward design migration between automotive and industrial grades without PCB layout changes.

Common application scenarios for this automotive isolated DC/DC module include battery-management systems (BMS), HEV/EV on-board chargers (OBC) and DC/DC converters, isolated bias for isolated voltage and current sensors, isolated bias for digital isolators, and isolated bias for isolated RS-485, RS-422, and CAN transceivers[reference:21]. Typical use cases involve providing isolated gate-drive bias power in traction inverters, supplying isolated power to shunt-based current sensing circuits in BMS, and powering isolated communication interfaces in automotive powertrain and chassis systems. The device's integrated transformer technology eliminates the need for discrete transformers and optocouplers, significantly simplifying system design and reducing board area usage[reference:22]. Thanks to its ultra-compact power density, robust 3kVrms isolation barrier, comprehensive protection features, and AEC-Q100 Grade 1 qualification, the UCC33020QRAQRQ1 has become a trusted choice for engineers seeking a versatile, reliable, and automotive-qualified isolated DC/DC power module-one that delivers the isolation integrity and fault reporting capability required for mission-critical automotive systems, all while maintaining the board-space efficiency and design simplicity of a single integrated device.