During testing on the QB solution board, the PSM demonstrated reliable monitoring of the IBC’s operation, input voltage, and performance metrics. The PMBus readings were stable and aligned with calibrated bench digital multimeter (DMM) measurements.
Fault‑injection tests confirmed that the PSM shut down the faulty channel as expected and accurately recorded events in the MFR_FAULT_LOG registers.
System-level validation showed that the integrated digital power management introduced no additional noise or instability
Controlled soft start algorithm helped prevent gate‑driver shoot-through and produced clean, smooth output waveforms. The I²C interface can run anywhere from 100 kHz to 400 kHz, which makes it flexible for different communication needs.
The voltage and temperature telemetry readings were very accurate—within ±0.1% for voltage and ±0.5% for temperature. See Figure 4
Overall, these results show that the LTC2971 improves quarter‑brick power solutions by adding accurate monitoring, fine-grained control, and detailed diagnostic data. Its PMBus compatibility ensures it can be adopted in modern telecom systems with minimal interoperability issues. See Figure 5.
Adding the LTC2971 PSM to the QB reference design provides major advantages for DC‑power systems:
- On-Chip 16‑bit telemetry provide high precision monitoring that meets stringent DC accuracy requirements.
- Features like sequencing and closed‑loop trim allow precise control of multiple power rails.
- The PMBus interface makes it easy to connect with modern rack‑management systems.
- Autonomous fault logging provides detailed diagnostic data that analog solutions usually cannot offer.
These capabilities do introduce additional design considerations, including careful configuration, calibration, and reliable bus operation. —but the improvements in system visibility, reliability, and control usually make it worthwhile.
Note: For systems needing more than nine power modules in parallel, the PSM may be less advantageous due to PMBus addressing limitations. In such cases, other ADI PSM ICs with advanced addressing capabilities are better suited.
Related Article:
What are the benefits of PMBus integration in power‑management applications?
LTC2971 Fault Logging Explained: How System Data is Auto‑Saved
How does the PSM handle power sequencing and multirail coordination?
How does the LTC2971 ensure high‑precision telemetry in power systems?
How does the LTC2971 support DPSM (Digital Power System Management) features?
Why is a digital power system manager (PSM) needed in modern data center?
Applicable Part Numbers
| DigiKey Part Number | Manufacturer Part Number |
|---|---|
| 161-LTC2971HY#PBF-ND | LTC2971HY#PBF |
| 161-LTC2971IY#PBF-ND | LTC2971IY#PBF |
| 161-LTC2971CY#PBF-ND | LTC2971CY#PBF |
| 161-LTC2971CY-2#PBF-ND | LTC2971CY-2#PBF |
| 161-LTC2971CY-3#PBF-ND | LTC2971CY-3#PBF |
| 161-LTC2971CY-1#PBF-ND | LTC2971CY-1#PBF |
| 505-LTC2971IY-1#PBF-ND | LTC2971IY-1#PBF |
| 505-LTC2971IY-2#PBF-ND | LTC2971IY-2#PBF |
| 161-LTC2971IY-3#PBF-ND | LTC2971IY-3#PBF |
| 505-LTC2971HY-1#PBF-ND | LTC2971HY-1#PBF |
| 161-LTC2971HY-2#PBF-ND | LTC2971HY-2#PBF |
| 161-LTC2971HY-3#PBF-ND | LTC2971HY-3#PBF |
| 175-MAX17651AZT+TTR-ND,175-MAX17651AZT+TCT-ND,175-MAX17651AZT+TDKR-ND | MAX17651AZT+T |
| 505-MAX17651ATT±ND | MAX17651ATT+ |
| 175-MAX17651AZT+TCPCTR-ND,175-MAX17651AZT+TCPCCT-ND,175-MAX17651AZT+TCPCDKR-ND | MAX17651AZT+TCPC |
| 505-MAX17651ATT+TTR-ND | MAX17651ATT+T |
| MAX17651AZT±ND | MAX17651AZT+ |