Camera modules are the most supply-noise-sensitive loads in a modern car, and they sit on the noisiest rail in it. Between load-dump transients on the battery line and the pixel clock pushing noise back up the chain, the regulator feeding a surround-view or ADAS camera has to do two opposite things at once: survive a 36 V input world and stay quiet enough that the image sensor never sees it.
The AWK6943 from Analogwin (Xiangxiang Cheng) was designed for exactly this rail. It is a 36 V, 3 A synchronous step-down regulator qualified to AEC-Q100, and it packs the whole power stage — both MOSFETs, compensation, protection — into a 3 × 3 mm QFN-8.
The short answer
For automotive camera modules, cockpit displays and ADAS sensor boxes running from a 9–16 V battery rail with transients, the AWK6943 gives you:
- 36 V input rating — rides through load-dump-adjacent conditions without an external TVS doing all the work
- 3 A output — enough for a camera module SoC plus its SERDES link
- 30 µA quiescent current — keeps the always-on camera node from draining the battery when the car sleeps
- AEC-Q100 qualified — the checkbox that matters for automotive BOM approval
Verified key parameters
From the AWK6943 Rev 1.3 datasheet:
| Parameter | Value | Condition / Note |
|---|---|---|
| Input voltage | 3.0 – 36 V | Recommended operating range |
| Output current | 3 A | Integrated high-side and low-side MOSFETs |
| Output voltage range | 0 – 24 V | Set by resistor divider |
| Switching frequency | 410 kHz typ | 350–470 kHz range |
| Quiescent current | 20 µA typ (non-switching) | 8 µA shutdown |
| Reference voltage | 1.0 V, ±1.5% | Over −40 to +125 °C |
| Peak efficiency | >95% | 12 V in to 5 V out |
| Minimum on-time | 40 ns typ | Supports high ratio conversions |
| Current limit | 3.5 A min high-side | Cycle-by-cycle, hiccup on short |
| Package | QFN-8, 3 × 3 mm | AEC-Q100 |
| ESD | ±2 kV HBM | |
| Junction temperature | −40 to +125 °C |
Why these specs matter in a camera module
The 30 µA quiescent question. A surround-view camera system stays powered in low-power mode while the car is parked — for dashcams and sentinel-mode systems, it may stay on for days. At 30 µA (20 µA non-switching, 8 µA in shutdown), the regulator itself stops being the parasitic load that flattens a 12 V battery over a two-week airport stay.
40 ns minimum on-time. A 36 V input down to a 3.3 V sensor rail is a 10:1 conversion. At 410 kHz that needs very short on-times; with 40 ns minimum on-time the AWK6943 holds regulation cleanly at high step-down ratios, where older 36 V parts start pulsing or skipping.
Integrated compensation. Car camera boards are dense — the SERDES, the PMIC and the image sensor compete for the same square centimetres. Internal compensation removes the external RC network and its tuning step, so one layout serves multiple output voltage variants.
Protection that matches the environment. Cycle-by-cycle current limit with hiccup mode handles a shorted SERDES cable; thermal shutdown with auto-recovery handles a blocked ventilation path in a trunk-mounted ECU. Precision enable and a power-good output make sequencing with the sensor rail straightforward.
Where it fits and where it does not
Good fit:
- Camera modules (cockpit, surround view, ADAS front camera) from a 12 V battery rail
- USB and display ports on cockpit SoCs needing a quiet 5 V or 3.3 V intermediate rail
- Battery-powered industrial and medical systems with the same wide-input need
Wrong fit:
- Rails above 3 A — move to a controller + external FET architecture
- Outputs above 24 V — outside the recommended range
- Designs already standardised on another AEC-Q100 part with second-source obligations
About replacing BT1433-class regulators
The AWK6943 is positioned as a domestic alternative in 36 V, 2–3 A automotive buck designs where parts in the BT1433 class are currently designed in. The comparison that matters in practice is concrete: same AEC-Q100 qualification level, same 3 × 3 QFN footprint class, 410 kHz switching with integrated compensation, and a supply chain that quotes in weeks rather than quarters. For a camera module programme facing allocation risk on the incumbent part, the practical evaluation path is to request the AWK6943 evaluation board, drop it into the existing camera power reference layout, and compare conducted EMI and transient response on the real rail.
Frequently asked questions
Is the AWK6943 really AEC-Q100 qualified?
Yes. AEC-Q100 qualification is listed in the Rev 1.3 datasheet feature list, and the part is explicitly targeted at automotive cockpit and ADAS applications.
Can it run from a 24 V industrial rail?
Yes. The recommended input range is 3.0 to 36 V with a maximum output of 24 V, so 24 V industrial inputs down to 5 V or 3.3 V rails are within range.
What switching frequency options exist?
The AWK6943 runs at 410 kHz typical (350–470 kHz). If your EMI plan needs a different band, the AWK6613 family offers 400 kHz, 1.4 MHz and 2.1 MHz frequency variants.
Does it need external compensation?
No. Compensation is internal, which removes a tuning step and several passive parts from the camera module layout.
Sourcing note
The AWK6943 is available through Mandu with the Rev 1.3 datasheet, reference schematics and layout guidance. Send your rail voltage, output current and quantity for a technical-matched quotation.