LTC2977IUP - 8-Ch PMBus Power System Manager | ADI
MPN: LTC2977IUP ✓ सक्रियLTC2977IUP अवलोकन
A Power System Manager is a digital supervisor IC placed above point-of-load converters on a board's power tree; it interfaces to the host through PMBus (Power Management Bus) and replaces discrete supervisors, DACs, and watchdog timers with a single configurable device. The LTC2977 sits at the supervisory tier of the power management hierarchy: PMBus controller -> power system manager -> supervisor/monitor -> power management IC (PMIC) -> voltage regulator -> point-of-load converter.
Key features include 8 independent channels, integrated 14-bit ADC for voltage/current readback, programmable OV/UV/OC/UC thresholds, fault logging with black-box EEPROM, closed-loop trim (servo) of any DC-DC converter, and per-rail margining. The IUP suffix denotes the -40 C to +105 C industrial temperature grade. Per the manufacturer datasheet, this part is recommended for new designs and supports 1 ku list pricing starting from $16.46 as of 2026-10-08.
The architecture combines an ARM-based M0 host core with hardware timers and analog comparators, allowing the IC to assert PG (power-good) and ALERTB lines autonomously even without host intervention. PMBus commands support power supply sequencing, precision point-of-load voltage adjustment and margining per the datasheet functional description.
Typical applications include sequencing and trimming FPGA/processor core and memory rails in telecom and datacom boards, server and storage backplanes with N+1 redundancy, industrial PLC power trees, and digital health monitoring of point-of-load converters in test equipment.
When designing with the LTC2977IUP, observe the 4.5 V to 15 V VDD range and decouple the 3.3 V AUX rail with a 1 uF X7R ceramic close to the pin. Always enable the internal black-box fault log EEPROM before relying on unattended fault capture.
This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical design notes not consolidated on any single distributor or manufacturer page.
के लिए ड्रॉप-इन विकल्प LTC2977IUP — समान पैकेज, पिन-टू-पिन संगत। PCB रीवर्क आवश्यक करने वाले भिन्न-पैकेज पार्ट्स शामिल नहीं हैं।
इस सीरीज़ के वेरिएंट
समान श्रृंखला के मॉडल जो ड्रॉप-इन संगत हैं LTC2977IUP (समान फॉर्म फैक्टर और फुटप्रिंट) — इसमें भिन्न ADC Resolution, Interface, Package, RoHS Status.
LTC2977IUP#PBF
✅ ड्रॉप-इन📋 संदर्भ विकल्प (कैटलॉग में नहीं)
LTC2977CUP
✅ ड्रॉप-इन📋 संदर्भ विकल्प (कैटलॉग में नहीं)
LTC2978AIUP#PBF
✅ ड्रॉप-इन📋 संदर्भ विकल्प (कैटलॉग में नहीं)
LTC2977IUP#WTRPBF
✅ ड्रॉप-इन📋 संदर्भ विकल्प (कैटलॉग में नहीं)
LTC2977BIUP
✅ ड्रॉप-इन📋 संदर्भ विकल्प (कैटलॉग में नहीं)
LTC2977IUP विशेषताएं
| फ़ंक्शन | 8-Channel PMBus Power System Manager |
| चैनल | 8 |
| Supply Voltage (VDD) | 4.5 V to 15 V |
| Auxiliary Supply (VAA/3V3) | 3.3 V |
| सप्लाई करंट | 10 mA typical |
| इंटरफ़ेस | PMBus / I2C-compatible SMBus |
| ADC Resolution | 14-bit (per datasheet functional description) |
| ऑपरेटिंग तापमान | -40 C to +105 C (I grade) |
| पैकेज | 64-Pin QFN (9 mm x 9 mm) with exposed pad |
| माउंटिंग प्रकार | Surface Mount |
| Fault Logging | Internal black-box EEPROM |
| Trim / Margining | Yes, per-rail closed-loop servo |
| MSL स्तर | 3 (per JEDEC J-STD-020) |
| RoHS स्थिति | Compliant (#PBF suffix) |
LTC2977IUP 64-pin qfn (9 mm x 9 mm) with exposed pad पिन कॉन्फ़िगरेशन गाइड
LTC2977IUP (64-pin qfn (9 mm x 9 mm) with exposed pad पैकेज) के लिए पिन कॉन्फ़िगरेशन। पिन नंबरिंग, फ़ंक्शन और कनेक्शन आरेख निर्माता डेटाशीट में परिभाषित हैं। सटीक फुटप्रिंट और सोल्डरिंग दिशानिर्देशों के लिए इसे देखें।
इसके लिए कोई विस्तृत pinout data उपलब्ध नहीं: LTC2977IUP.
देखें डेटाशीट पूर्ण पिन कॉन्फ़िगरेशन के लिए।
सामान्य अनुप्रयोग
LTC2977IUP के लिए उपयुक्त है 7 अनुप्रयोगs: FPGA/Processor Power Sequencing, Server & Storage Backplane Monitoring, Industrial PLC & Factory Automation, Telecom & Networking Equipment, Test & Measurement Instrumentation, Medical Imaging & Patient Monitoring, Aerospace & Avionics Power Conditioning.
FPGA/Processor Power Sequencing
The LTC2977IUP's 8 independent channels and per-rail sequencing timers make it ideal for sequencing FPGA core, transceiver, and DDR rails in mid-to-large systems. Per the manufacturer datasheet, the device supports programmable ramp rates, time slots, and dependency tracking, allowing complex multi-rail power-up profiles for SoCs that demand precise rail-to-rail timing. The 4.5 V to 15 V VDD range accepts 5 V and 12 V intermediate buses typically used for FPGA power trees.
अनुशंसित
Server & Storage Backplane Monitoring
In server, storage, and switching backplanes the LTC2977IUP provides telemetry and fault logging for up to 8 rails per device, with the internal black-box EEPROM capturing OV/UV/OC events even when the host is offline. Per the manufacturer datasheet, the IC's 14-bit ADC delivers accurate voltage and current readback through PMBus, supporting remote health monitoring and predictive maintenance. Industrial temperature grade (-40 C to +105 C) covers harsh backplane inlet temperatures.
अनुशंसित
Industrial PLC & Factory Automation
PLC power trees in factory automation environments combine analog I/O, digital logic, and communication rails that must power up and down in a specific order. The LTC2977IUP, rated -40 C to +105 C, supports up to 8 rails of sequencing, trimming, and fault supervision through PMBus, replacing a rack of discrete supervisors. Per the datasheet, integrated margining simplifies production-board characterization and field calibration for analog measurement modules.
अनुशंसित
Telecom & Networking Equipment
Telecom shelves and router line cards require per-rail sequencing, hot-swap coordination, and extensive fault logging. The LTC2977IUP, with its 4.5 V to 15 V VDD range, accepts standard -48 V isolated backplane rails and provides 8 channels of supervision. Per the manufacturer datasheet, the device logs faults to its internal EEPROM, enabling post-mortem analysis without host intervention - critical for unattended remote sites.
अनुशंसित
Test & Measurement Instrumentation
In automated test equipment and bench instruments, the LTC2977IUP provides deterministic rail sequencing for ADC/DAC references, DAC bias, and analog front-end power. The device's 14-bit ADC readback, per the manufacturer datasheet, supports closed-loop trim that compensates for resistor-divider tolerances and reference drift, improving measurement accuracy. Industrial temperature rating makes the part suitable for both bench and field deployments.
अनुशंसित
Medical Imaging & Patient Monitoring
Multi-rail medical devices such as ultrasound carts and patient monitors require fail-safe power-up sequencing and continuous fault supervision. The LTC2977IUP supports per-rail OV/UV/OC supervision, fault logging, and closed-loop trim, ensuring stable bias for analog front-end and DSP rails. The industrial temperature grade and lead-free RoHS-compliant packaging (#PBF) help meet medical equipment environmental and reliability requirements.
अनुशंसित
Aerospace & Avionics Power Conditioning
Avionics line-replaceable units demand precise, deterministic multi-rail sequencing and fault logging across wide temperature ranges. The LTC2977IUP, rated -40 C to +105 C and qualified to manufacturer automotive/extended flow (#WTRPBF variant), meets many avionics power management requirements. The device's internal fault EEPROM captures pre-shutdown telemetry that supports maintenance investigations after in-flight events.
अनुशंसित
अनुशंसित उत्पादों का सारांश
के लिए इंजीनियरिंग संदर्भ डेटा LTC2977IUP — तुलना, डिज़ाइन मार्गदर्शन और अनुपालन जानकारी।
चयन गाइड
विकल्पों के साथ तुलना
| पैरामीटर | यह उत्पाद | LTC2977IUP#PBF | LTC2977CUP | LTC2978AIUP#PBF | LTC2977IUP#WTRPBF | LTC2977BIUP |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 64-pin QFN (9 mm x 9 mm) | 64-pin QFN (9 mm x 9 mm) - same | 64-pin QFN (9 mm x 9 mm) - same | 64-pin QFN - same | 64-pin QFN (9 mm x 9 mm) - same | 64-pin QFN (9 mm x 9 mm) - same |
| Channels | 8 | 8 | 8 | 8 (extended feature) | 8 | 8 |
| Supply Voltage (VDD) | 4.5 V to 15 V | 4.5 V to 15 V | 4.5 V to 15 V | wider range | 4.5 V to 15 V | 4.5 V to 15 V |
| Temperature Grade | -40 C to +105 C (Industrial) | -40 C to +105 C | 0 C to +70 C (Commercial) | Industrial / AEC-Q100 ready | -40 C to +125 C (Automotive) | -40 C to +105 C |
| Interface | PMBus / SMBus | PMBus / SMBus | PMBus / SMBus | PMBus / SMBus | PMBus / SMBus | PMBus / SMBus |
| ADC Resolution | 14-bit | 14-bit | 14-bit | 14-bit (higher accuracy) | 14-bit | 14-bit |
| RoHS | Yes (#PBF suffix) | Yes | Yes | Yes | Yes | Yes |
मुख्य विशेषताएँ
- Industrial temperature grade standard on the IUP part number (बनामLTC2977CUP)
- Pin-compatible upgrade path to extended feature set (बनामLTC2978AIUP#PBF)
- Wide-temp automotive grade tape-and-reel variant available (बनामLTC2977IUP#WTRPBF)
डिज़ाइन नोट्स
Estimated: at VDD = 12 V and I_DD = 10 mA typical (per datasheet), the LTC2977IUP dissipates approximately 120 mW on its VDD pin; designers should keep VDD on a separate rail (e.g. tap from the 12 V intermediate bus) and decouple with a 1 uF X7R 25 V ceramic within 2 mm of the VDD pin to prevent noise coupling into analog ADC readings.
The 64-pin QFN (9 mm x 9 mm) exposed pad carries the primary thermal path. Connect the EP to a continuous inner-plane copper pour (at least 1 square inch of 2 oz copper) with at least 12 thermal vias to a back-side ground plane. Without this, theta_JA rises above the datasheet 28 C/W rating and channel-to-channel thermal drift can corrupt ADC readback above 85 C.
Route PMBus SDA/SCL traces as a daisy-chain between devices and place a 2.2 kohm pull-up to 3.3 V AUX within 50 mm of the farthest device. Keep VSESEnSET traces short and away from switching converter switch-node traces to avoid injected common-mode noise that would skew closed-loop trim measurements. The exposed pad must be soldered to the board ground plane for both thermal and electrical reference.
Do not leave the 3.3 V AUX supply unpowered while VDD is present; the I2C pull-ups and ALERTB line are referenced to AUX and can float mid-rail. Always issue a CLEAR_FAULTS command after a fault event before reading telemetry, otherwise the LTC2977IUP returns stale data from the black-box EEPROM and the host mis-diagnoses the board state.
अनुपालन जानकारी
RoHS compliance confirmed via the #PBF suffix on the part number. Automotive-grade variants exist as #WPBF / #WTRPBF - the standard LTC2977IUP is not AEC-Q100 qualified; choose the LTC2977IUP#WPBF for automotive designs.
