RIC70115 GaN driver choices show why a satellite power-stage switch to gallium nitride is more than a transistor decision. Infineon’s part makes gate drive, protection, qualification, and packaging part of the same review.

All About Circuits highlighted the device on August 7 as a radiation-hardened driver for GaN HEMTs and logic-level silicon FETs in high-reliability space systems. Infineon introduced the RIC70115 on July 15 for satellite and other high-reliability applications. The practical value is not a generic claim that GaN is faster. It is that a single qualified driver integrates functions engineers would otherwise select, lay out, and qualify around the switching device.

The named part and its documented envelope

The RIC70115 is a gate driver, not a GaN power transistor. According to Infineon and its datasheet, it supports high-side and low-side configurations for GaN HEMTs and logic-level silicon MOSFETs. Key documented parameters include:

ParameterRIC70115 documented valueDesign meaning
Output drive1.5 A source, 2.5 A sinkControls how quickly the power-device gate is charged and discharged.
Propagation delay matching2.9 nsTiming matters for fast power stages and switching-node noise margin.
Gate-drive regulationintegrated 4.8 V LDOReduces a separate local regulator block; input range is 4.75 V to 15 V.
Radiation performance100 krad(Si) TID; SEE characterized to 81.9 MeV·cm²/mg LETAddresses cumulative dose and single-event exposure, but does not replace system radiation analysis.
Temperature range−55°C to +125°CSuitable for the specified military ambient range.
Package16-pin hermetic ceramic LCCPackage, assembly flow, thermal path, and inspection requirements differ from commercial plastic parts.

These values define a design envelope, not a drop-in promise. A driver with adequate current and radiation performance can still be unsuitable if input logic, bias rails, isolation strategy, dead-time control, or package footprint does not fit the converter.

What is integrated—and why that matters

Three integrated functions make the part relevant to a satellite power-stage review.

Truly Differential Input (TDI). Infineon says the differential input rejects common-mode interference. In a fast-switching GaN stage, the switch node can couple energy into control lines. Differential signaling improves noise immunity only when routing, reference planes, and return paths preserve the intended common-mode behavior.

Independent Miller clamp. A rapid drain-voltage transition can inject charge through a FET’s Miller capacitance and raise the gate of a device meant to stay off. The clamp counters parasitic turn-on. Layout inductance, gate-loop impedance, and the transistor’s capacitances still set complete switching behavior.

4.8 V LDO and protection functions. An on-chip LDO, undervoltage lockout, and driver/protection blocks reduce external parts that must be qualified. For a space program, fewer components can simplify screening and failure-mode analysis. Decoupling, external protection, and documented derating remain required.

Equivalent to what—and not equivalent to what

The RIC70115 can be a functional substitute only for a space-qualified gate-driver function whose interface and qualification requirements match. It is designed to drive both GaN HEMTs and logic-level silicon FETs, which supports staged migration: keep some silicon switches while introducing GaN in selected converters.

It is not automatically equivalent to:

  • a commercial GaN driver in a plastic QFN or SOIC package;
  • an isolated gate-driver module, because isolation architecture is a separate system choice;
  • a multi-channel driver, if the topology needs independently controlled half bridges or redundant paths;
  • a high-voltage gate driver, because bootstrap, isolation, and common-mode behavior depend on topology; or
  • a drop-in replacement based only on pin count or output current.

For sourcing or redesign, compare package footprint, input logic thresholds, bias range, source/sink currents, propagation-delay limits, clamp behavior, radiation qualification, screening level, and availability. “Radiation hardened” is not one universal equivalence class.

A short selection workflow

  1. Start with the power device. Confirm gate-voltage limits, recommended drive conditions, total gate charge, Miller charge, and required switching speed for the GaN HEMT or silicon MOSFET.
  2. Calculate the gate loop. Compare 1.5 A source and 2.5 A sink with chosen gate resistors, parasitic inductance, rise/fall targets, and EMI limits.
  3. Map the topology. Identify true low-side, high-side, or isolated/half-bridge use. Do not infer this from a generic product label.
  4. Check the mission environment. Match TID, single-event, temperature, screening, traceability, and assembly requirements to the orbit and assurance plan.
  5. Validate on the evaluation board, then on the real layout. Infineon lists the RIC70115EVAL1. Bench results on a compact evaluation board help; the flight-relevant answer comes from the intended power-stage geometry and harness environment.

Why this qualifies as a component article

The design-source report names a specific part and a practical selection problem: controlling GaN or silicon power stages under radiation and fast-switching noise constraints. It is supported by Infineon’s product announcement and datasheet. Reader value is a checklist of what the driver consolidates—and what must still be verified at the converter and mission level.

Sources