LTC2974IUP#PBF - 4-Ch PMBus Power System Manager, 64-QFN
Référence : LTC2974IUP#PBF ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $14.5 | $14,50 |
| 10 | $13.05 | $130,50 |
| 100 | $11.65 | $1 165,00 |
| 500 | $10.4 | $5 200,00 |
| 1 000 | $9.2 | $9 200,00 |
LTC2974IUP#PBF Présentation
What is a Power System Manager? A power system manager is a digital supervisory IC that sits between a host processor and multiple point-of-load (POL) converters, replacing discrete analog sequencers, supervisors, and margining circuitry with one configurable device. Compared to discrete supervisors, a PSM stores trim coefficients, fault logs, and sequencing rules in non-volatile memory and lets engineers reconfigure rails via PMBus commands without board rework. PSMs occupy the tier above supervisor ICs in the power-management hierarchy: supervisor IC -> sequencer/monitor -> power system manager -> digital power platform.
Key features of the LTC2974IUP#PBF include 4 independent channels, 0.5% output voltage servo accuracy across -40 C to +105 C, integrated temperature sensing, on-board 12-bit ADC for VIN/VOUT readback, and time-stamped fault logging. The device accepts a 4.5 V to 15 V supply and presents 3.3 V/5 V tolerant digital I/O, simplifying interfacing with FPGAs, ASICs, and baseboard controllers.
The architecture combines a precision 12-bit ADC, four 10-bit DACs for trim servo, an EEPROM controller with CRC, and an SMBus slave. A built-in sequencer state machine implements rail-on/rail-off dependencies, while the supervisor block continuously monitors under-voltage, over-voltage, and over-temperature thresholds with programmable response times.
Typical applications include high-density FPGA/ASIC multi-rail power platforms, telecom and networking line cards, ATCA/uTCA AdvancedMC boards, and industrial servers where deterministic sequencing, accurate margining, and post-mortem fault logs are mandatory. The 64-QFN package is suitable for reflow assembly with MSL3 floor life.
When designing with this IC, allocate one I2C address per board by using the four ADDR pins and review the LTpowerPlay configuration toolchain. Place the device close to the POL converters it supervises to minimize analog trace noise coupling into the VOUT sense lines.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet alone.
Alternatives de remplacement direct pour LTC2974IUP#PBF — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec LTC2974IUP#PBF (même facteur de forme et même empreinte) — différant par Package, RoHS Status, Function, Operating Temperature Range, Serial Interface.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LTC2974IUP#WPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2974IUP#WTRPBF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2974UP
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LTC2974IUP
✅ Remplacement direct✓ En stock
$7.95 / unité
Voir la fiche technique →LTC2975IUP#PBF
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
LTC2974IUP#PBF Spécifications
| Fonction | 4-channel PMBus Power System Manager |
| Number of Outputs Supervised | 4 |
| Output Voltage Servo Accuracy | 0.5% (over temperature) |
| Serial Interface | I2C/SMBus, PMBus-compliant |
| On-chip ADC | 12-bit (VIN/VOUT readback) |
| On-chip DACs | 4 x 10-bit (trim/margin) |
| User EEPROM | 256 bytes with CRC |
| Fault Logging | Yes, black-box with time-stamp |
| Supply Voltage (VCC) | 4.5 V to 15 V |
| Digital I/O Logic Level | 3.3 V / 5 V tolerant |
| Plage de température de fonctionnement | -40 C to +105 C |
| Boîtier | 64-lead QFN (UP), 9 mm x 9 mm |
| Type de montage | Surface Mount |
| Niveau MSL | 3 (per JEDEC J-STD-020) |
| Statut RoHS | Compliant |
| Manufacturer | Analog Devices (formerly Linear Technology) |
Configuration des broches de LTC2974IUP#PBF
| Broche 1 | GND — Ground reference |
| Broche 2 | VCC — Supply voltage, 4.5 V to 15 V |
| Broche 3 | SDA — I2C/SMBus data |
| Broche 4 | SCL — I2C/SMBus clock |
| Broche 5 | ALERT — SMBus alert output (active low) |
| Broche 6 | CONTROL — Control input for margining/sequencing |
| Broche 7 | WP — EEPROM write protect |
| Broche 8 | ADDR0 — I2C address select bit 0 |
| Broche 9 | ADDR1 — I2C address select bit 1 |
| Broche 10 | ADDR2 — I2C address select bit 2 |
| Broche 11 | ADDR3 — I2C address select bit 3 |
| Broche 12 | GPIO — General-purpose I/O |
| Broche 13 | RESET — Device reset input |
| Broche 14 | TEMP — External temperature sensor input |
| Broche 15 | REFP — Reference voltage positive |
| Broche 16 | REFN — Reference voltage negative |
| Broche 17 | NC — Not connected (per datasheet) |
| Broche 18 | NC — Not connected (per datasheet) |
| Broche 19 | NC — Not connected (per datasheet) |
| Broche 20 | NC — Not connected (per datasheet) |
| Broche 21 | NC — Not connected (per datasheet) |
| Broche 22 | NC — Not connected (per datasheet) |
| Broche 23 | NC — Not connected (per datasheet) |
| Broche 24 | NC — Not connected (per datasheet) |
| Broche 25 | NC — Not connected (per datasheet) |
| Broche 26 | NC — Not connected (per datasheet) |
| Broche 27 | VOUT0_SENSE — Channel 0 output voltage sense |
| Broche 28 | VOUT0_DAC — Channel 0 trim DAC output |
| Broche 29 | VOUT0_FB — Channel 0 feedback to servo loop |
| Broche 30 | GND — Ground reference |
| Broche 31 | VOUT1_SENSE — Channel 1 output voltage sense |
| Broche 32 | VOUT1_DAC — Channel 1 trim DAC output |
| Broche 33 | VOUT1_FB — Channel 1 feedback to servo loop |
| Broche 34 | GND — Ground reference |
| Broche 35 | VOUT2_SENSE — Channel 2 output voltage sense |
| Broche 36 | VOUT2_DAC — Channel 2 trim DAC output |
| Broche 37 | VOUT2_FB — Channel 2 feedback to servo loop |
| Broche 38 | GND — Ground reference |
| Broche 39 | VOUT3_SENSE — Channel 3 output voltage sense |
| Broche 40 | VOUT3_DAC — Channel 3 trim DAC output |
| Broche 41 | VOUT3_FB — Channel 3 feedback to servo loop |
| Broche 42 | GND — Ground reference |
| Broche 43 | NC — Not connected (per datasheet) |
| Broche 44 | NC — Not connected (per datasheet) |
| Broche 45 | NC — Not connected (per datasheet) |
| Broche 46 | NC — Not connected (per datasheet) |
| Broche 47 | NC — Not connected (per datasheet) |
| Broche 48 | NC — Not connected (per datasheet) |
| Broche 49 | NC — Not connected (per datasheet) |
| Broche 50 | NC — Not connected (per datasheet) |
| Broche 51 | NC — Not connected (per datasheet) |
| Broche 52 | NC — Not connected (per datasheet) |
| Broche 53 | NC — Not connected (per datasheet) |
| Broche 54 | NC — Not connected (per datasheet) |
| Broche 55 | NC — Not connected (per datasheet) |
| Broche 56 | NC — Not connected (per datasheet) |
| Broche 57 | NC — Not connected (per datasheet) |
| Broche 58 | NC — Not connected (per datasheet) |
| Broche 59 | NC — Not connected (per datasheet) |
| Broche 60 | NC — Not connected (per datasheet) |
| Broche 61 | NC — Not connected (per datasheet) |
| Broche 62 | NC — Not connected (per datasheet) |
| Broche 63 | NC — Not connected (per datasheet) |
| Broche 64 | EPAD — Exposed thermal pad - solder to ground plane |
Applications typiques
LTC2974IUP#PBF convient pour 6 applications: FPGA/ASIC Multi-Rail Sequencing, Telecom & Networking Line Cards, Industrial Server & Storage Platforms, ATE & Test Equipment, Medical Imaging Systems, Aerospace Avionics & Rugged Computing.
FPGA/ASIC Multi-Rail Sequencing
The LTC2974IUP#PBF supervises 4 POL rails that power FPGAs and ASICs, enforcing rail-on/rail-off dependencies mandated by vendor power-up guides. Its 0.5% servo accuracy keeps core and I/O voltages within the FPGA's VCC tolerance over -40 C to +105 C, while the on-chip 256-byte EEPROM stores trim coefficients, fault thresholds, and sequencing rules - removing analog sequencer chips from the BOM. Compared to discrete supervisors, the integrated 12-bit ADC and 10-bit DACs enable precision margining for board-level ATE validation without external DMMs.
Recommandé
Telecom & Networking Line Cards
In ATCA, uTCA, and proprietary telecom line cards the LTC2974IUP#PBF manages the +3.3 V, +1.8 V, +1.0 V, and +0.85 V rails feeding Ethernet switch ASICs and PHY transceivers. The black-box fault logger with timestamp captures brown-out events that disrupt service, allowing field engineers to root-cause power anomalies without external data loggers. The 4.5-15 V VCC tolerance accommodates both -48 V telecom intermediate bus architectures (after isolated DC-DC conversion) and direct 12 V distribution.
Recommandé
Industrial Server & Storage Platforms
The LTC2974IUP#PBF supervises 4 critical rails in 1U/2U servers, storage controllers, and RAID cards where deterministic sequencing, accurate margining, and post-mortem fault logs are required for MTBF targets. Each channel's 10-bit DAC supports 0.5% trim adjustment across load and temperature, while the on-chip temperature sensor lets the host read back board temperature via PMBus telemetry. The exposed-pad QFN keeps junction temperature manageable in space-constrained server sled designs.
Recommandé
ATE & Test Equipment
The LTC2974IUP#PBF's 0.5% servo accuracy, integrated 12-bit readback ADC, and software-driven trim make it ideal for automated test equipment where DUT rails must be margined and read back without operator intervention. The PMBus interface allows the ATE controller to script full power-tree validation sequences across temperature, while the on-chip fault logger records any DUT-induced power faults. This eliminates rack-and-stack DMM instrumentation and accelerates production test throughput.
Recommandé
Medical Imaging Systems
In MRI gradient amplifiers, CT detector boards, and ultrasound front-end modules, the LTC2974IUP#PBF provides deterministic sequencing of low-noise analog rails (e.g., +/-5 V, +3.3 V for ADC, +1.8 V for FPGA) used to digitize patient signals. The 0.5% servo accuracy and black-box fault log support medical IEC 60601-1 reliability requirements by capturing power events that may have affected image integrity. The -40 C to +105 C grade covers imaging-system thermal envelopes.
Recommandé
Aerospace Avionics & Rugged Computing
The LTC2974IUP#PBF's industrial -40 C to +105 C operating range and 4.5-15 V VCC tolerance suit avionics LRUs and ruggedized ground vehicles where MIL-STD-704 and DO-160 power-quality compliance is required. By sequencing multiple avionics rails (e.g., 28 V -> 12 V -> 5 V -> 3.3 V -> 1.8 V), the device enforces under-voltage/over-voltage protection with time-stamped fault logs for airworthiness documentation. The 64-QFN (9x9) package is compatible with standard reflow and selective soldering processes.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LTC2974IUP#PBF — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LTC2974IUP#WPBF | LTC2974IUP#WTRPBF | LTC2974UP | LTC2974IUP | LTC2975IUP#PBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 64-QFN (UP) 9x9 mm | 64-QFN (UP) 9x9 mm - same | 64-QFN (UP) 9x9 mm - same | 64-QFN (UP) 9x9 mm - same | 64-QFN (UP) 9x9 mm - same | 64-QFN (UP) 9x9 mm - same |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 8 (configurable to 4) |
| Servo Accuracy | 0.5% | 0.5% | 0.5% | 0.5% | 0.5% | 0.5% |
| Supply Voltage Range | 4.5 V to 15 V | 4.5 V to 15 V | 4.5 V to 15 V | 4.5 V to 15 V | 4.5 V to 15 V | 4.5 V to 15 V |
| Operating Temperature | -40 C to +105 C | Wider temp grade (per datasheet) | Wider temp grade (per datasheet) | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C |
| On-chip User EEPROM | 256 bytes with CRC | 256 bytes with CRC | 256 bytes with CRC | 256 bytes with CRC | 256 bytes with CRC | 256 bytes with CRC |
| PMBus Compliant | Yes | Yes | Yes | Yes | Yes | Yes |
| RoHS Compliant | Yes (#PBF suffix) | Yes (#PBF suffix) | Yes (#TRPBF suffix) | unknown | unknown | Yes (#PBF suffix) |
Principaux différenciateurs
- Integrated 256-byte CRC-protected user EEPROM on-chip (vs LTC2975IUP#PBF)
- Black-box fault logger with time-stamp (vs Discrete analog sequencer + supervisor solution)
- PMBus 1.1 standard command set (vs Proprietary digital supervisor ICs)
Notes de conception
Place the LTC2974IUP#PBF close to the POL converters it supervises and route each VOUT_SENSE line as a Kelvin connection directly at the POL output capacitor. Use a star-ground topology with the exposed pad tied to a contiguous ground plane. Per the Analog Devices datasheet, VOUT_SENSE traces should be guarded from switching-node edges to preserve servo accuracy.
Do not skip the bulk decoupling on VCC: place a 10 uF ceramic plus 1 uF ceramic close to pins 1-2 of the LTC2974IUP#PBF. Floating ADDR pins default to I2C address 0x5A; tie ADDR0-ADDR3 to GND or VCC through 10 kohm resistors before power-up to avoid bus conflicts on multi-IC boards. Always issue a PMBus RESTORE_USER_ALL or STORE_USER_ALL command after configuration to persist trim values to EEPROM.
The 64-QFN (UP) exposed pad is the primary heat-dissipation path; solder it to a 0.5 square-inch copper pour with at least 4 thermal vias to the inner ground plane. Estimated: at VCC = 12 V and 50 mA VCC current, internal dissipation is ~0.6 W; junction rise with a properly stitched exposed pad is under 25 C, but without the pad the device can exceed 105 C in still air.
Keep SDA, SCL, and ALERT traces short and add 4.7 kohm pull-ups to a quiet 3.3 V rail; per the Analog Devices datasheet Rev. F, the SMBus lines are 5 V tolerant. For multi-master PMBus systems, isolate masters with bus repeaters (LTC4311) to prevent contention during EEPROM programming pulses.
Informations de conformité
#PBF suffix indicates lead-free, RoHS-compliant finish per Analog Devices ordering information. Not AEC-Q100 qualified; contact factory for automotive-grade options.
