Voltage headroom disappears
At sub-1V rails, cable, busbar and contact resistance can consume the entire voltage available to the load.
AI POWER RAIL / VRM / FUEL CELL TESTING
Ultra-Low Voltage, High-Current DC Load Test Solution
Apply full rated current where ordinary electronic loads run out of voltage headroom. FaithTech NZ/N loads reproduce sub-1V, kiloamp operating points for GPU and CPU power rails, VRMs, fuel-cell cells and production ATE.
Ultra-low voltage load platformReady
0.2V
FULL CURRENT
5,000A
MAX MODEL
20A/µs
SLEW RATE
0.2V @ 5,000A
Full-current operating point
-2.4V @ 1,200A
NZ active voltage support
Up to 20A/µs
Current slew rate
300W–15kW
Product-family power range
THE REAL LIMIT
High Current Is Only Useful If the Load Can Operate Near 0 V
At 1,000A and above, milliohms matter. The load, interconnect and measurement architecture must be designed as one electrical loop.
Operating envelope
Illustrative comparison at a 1,000A test point
1.0V0.8V0.6V0.4V0.2V0V
Typical load
FaithTech NFull current at 0.2V
The real DUT voltage must also cover voltage drop across busbars, cables, contacts and protection hardware.
Current must move fast
GPU, CPU and VRM rails require repeatable current steps that expose droop, recovery and protection behavior.
The test loop becomes part of the DUT
Low-inductance connections, remote sensing, synchronized acquisition and fixture design directly affect the result.
MODEL LADDER
Choose the Current Range Without Losing the 0.2V Operating Point
Selected N-series configurations provide full-current operation at 0.2V. Values shown are individual published model configurations, not combined family maxima.
| Model | Current | Power | Full-current point | Height |
|---|---|---|---|---|
| FT68203N-20-1000 | 1,000A | 3kW | 0.2V @ 1,000A | 3U |
| FT68206N-20-2000 | 2,000A | 6kW | 0.2V @ 2,000A | 5U |
| FT68209N-20-3000 | 3,000A | 9kW | 0.2V @ 3,000A | 12U |
| FT68212N-20-4000 | 4,000A | 12kW | 0.2V @ 4,000A | 12U |
| FT68215N-20-5000 | 5,000A | 15kW | 0.2V @ 5,000A | 12U |
Each row is an individual published configuration. Current, voltage and power ratings must be checked against the selected model and waveform.
TEST ARCHITECTURE
Treat the Load, Interconnect and Measurement as One System
A correct load selection can still produce misleading results if the busbar, remote sensing, trigger path and acquisition system are not configured for the target edge rate.
DUT / GPU VRM
Sub-1V rail or fuel-cell output
Low-Inductance Busbar
Short current path and remote sense
NZ/N Electronic Load
0.2V full-current loading
Measurement & ATS
Waveform capture, triggers and reports
Use remote sensing at the DUT connection point.
Keep the high-current loop short, wide and mechanically secure.
Specify pulse width, duty cycle and repetition rate, not only peak current.
Coordinate triggers with an oscilloscope or suitable acquisition system for edge measurements.
APPLICATION PATHS
One Platform for Three Low-Voltage, High-Current Workflows
Start with the electrical operating point, then add the fixture, measurement, channel count and automation required by the application.
GPU / CPU / VRM Validation
Reproduce sub-1V, kiloamp load conditions for Vcore rails, multiphase VRMs, PMICs and accelerator power modules.
- Voltage droop and recovery
- DVFS load-step profiles
- OCP and overload behavior
- Multi-rail sequence validation
Fuel Cell Single Cell & Short Stack
Load low-voltage electrochemical sources without losing the operating point in test-loop resistance.
- Polarization curve testing
- Dynamic load response
- Internal resistance evaluation
- Long-duration discharge
Production ATE & Power Modules
Turn engineering profiles into repeatable automated checks for low-voltage converters and power modules.
- CC / CV / CR / CP operation
- Sequence testing
- Remote control and data capture
- Pass/fail workflow integration
DYNAMIC PERFORMANCE
Reproduce the Current Event, Not Just the Average Load
Dynamic capability must be evaluated together with fixture inductance, model rating and the requested pulse profile.
20A/µs
Current slew rate
20kHz
Dynamic test frequency
4 modes
CC / CV / CR / CP
Sequence
Programmable test profiles
TEST-NODE SELECTION
Use NZ/N and FTR7000 at Different Points in the AI Power Chain
The products complement each other. Select by electrical node, not by product family alone.
Board / rail level
NZ/N Ultra-Low-Voltage Load
For sub-1V power rails and electrochemical sources where full current at minimal voltage is the defining requirement.
- GPU / CPU Vcore and VRM
- PMIC and low-voltage DC/DC
- Fuel-cell single cell / short stack
- 1,000A–5,000A N-series configurations
PSU / rack / HVDC level
FTR7000 Regenerative DC Load
For higher-voltage, higher-power AI PSU, HVDC bus, power shelf, rack burn-in and scalable regenerative loading.
- AI PSU and power shelf
- HVDC bus and BBU output
- 300kW per unit
- Parallel systems up to 3MW
WHY FAITHTECH
Built Around the Electrical Reality of Kiloamp Testing
Purpose-built operating point
Selected N models maintain full current down to 0.2V.
Scalable model ladder
Choose published 1,000A through 5,000A configurations.
System engineering
Coordinate load, busbar, sensing, measurement and automation.
Application depth
Support AI power rails, fuel cells, power modules and production ATE.
ENGINEERING FAQ
Questions to Resolve Before System Configuration
Why is minimum operating voltage more important than maximum current?+
A load may have a high current rating but still be unable to draw that current from a 0.2V rail. The complete current path must provide enough voltage to overcome the load minimum operating voltage plus cable, busbar and contact losses.
What is the difference between the NZ and N configurations?+
N configurations are designed for full-current operation down to 0.2V on selected models. NZ configurations add active voltage support for operating points that extend below 0V, with published configurations reaching -2.4V at 1,200A.
Can the system reproduce GPU and VRM transient profiles?+
Yes. The platform supports programmable dynamic loading, sequence testing and current slew rates up to 20A/µs. The achievable waveform at the DUT also depends on fixture inductance, cabling and the selected model.
Can multiple rails or channels be synchronized?+
A system can be configured with multiple loads, remote control, measurement and trigger coordination. Share the rail count, timing relationship and current profile so the correct control architecture can be selected.
Is this the same use case as the FTR7000 regenerative load?+
No. NZ/N is optimized for ultra-low-voltage, kiloamp test nodes such as GPU rails, VRMs and fuel-cell cells. FTR7000 is intended for higher-voltage, higher-power PSU, HVDC bus, rack and megawatt-scale regenerative testing.
What information is required to configure the test system?+
Provide the minimum DUT voltage, maximum current, power, number of rails, expected current slew rate, pulse duration, duty cycle, connection distance and required measurements.
CONFIGURATION REVIEW
Define the Real Operating Point Before Choosing the Load
Share minimum voltage at the DUT, maximum current, dynamic profile, pulse duration, number of rails and connection distance. FaithTech engineers will recommend the correct load, fixture and measurement configuration.