LTC2947IUHF-65#TRPBF - 65A Power/Energy Monitor IC | Analog Devices
부품 번호: LTC2947IUHF-65#TRPBF ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $11.5 | $11.50 |
| 10 | $10.2 | $102.00 |
| 100 | $8.75 | $875.00 |
| 500 | $7.4 | $3,700.00 |
| 1,000 | $6.55 | $6,550.00 |
LTC2947IUHF-65#TRPBF 개요
A power/energy monitor is an integrated mixed-signal IC that performs high-side or low-side current sensing, bus-voltage digitisation, time-integrated energy metering, and digital host reporting over serial bus. Within the broader taxonomy, the LTC2947 sits in the family of single-phase energy metering ICs, which are themselves a sub-category of power monitoring ICs, further classified under power management semiconductor devices. These parts are widely used to close the feedback loop between a load and a host processor or data-acquisition system by exposing precise real-time power telemetry for closed-loop control, billing-grade metering, or system health monitoring.
Three key features differentiate the LTC2947IUHF-65#TRPBF from generic current-sense amplifiers: (1) the on-chip 65A sense resistor eliminates shunt sourcing and Kelvin-layout burden; (2) the analog multiplier performs high-bandwidth instantaneous power computation without latency penalty; (3) internal temperature digitisation enables temperature-compensated coulomb count and lifetime energy logging for predictive maintenance. The integrated ADC architecture means raw transducer signals never traverse noisy PCB traces, preserving measurement integrity in high-current switching environments.
In terms of architecture, the IC separates the high-current shunt (Kelvin-bonded inside the package) from the low-voltage analog and digital sections, allowing the ADC front-end to operate at low common-mode while the load current traverses the package on an isolated rail. An internal or external clock option drives the ADC conversion rate, and on-chip accumulation registers store 16-bit voltage, current, and power values that the host can read over I2C or SPI. This combination lets the part function as a standalone coulomb counter that wakes the host only when polled, minimising system quiescent draw.
Typical applications include rack-mounted server and telecom 48V supply rails, battery-pack current and energy logging for UPS and e-mobility, industrial PLC power-budget monitoring, solar inverter string-level energy harvesting telemetry, and high-current lab instrumentation such as programmable bench power supplies. The 38-QFN package's exposed pad supports the dissipation generated when the full 65A flows through the internal sense resistor.
Designers should leave adequate copper area on the PCB beneath the exposed pad to keep junction temperature within the -40C to +85C industrial range, and route the high-current traces on top/bottom layers using Kelvin connections tied back to the part's sense pins. When integrating the part with an upstream MCU, choose either I2C or SPI in firmware-fixed mode based on desired address expansion and host overhead.
This page synthesises distributor pricing snapshots, same-package ADI and cross-brand drop-in alternatives, application notes, and PCB-layout design notes that go beyond the LTC2947 datasheet itself, consolidating practical selection information for energy-metering designs.
드롭인 대체품: LTC2947IUHF-65#TRPBF — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
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이 제품에는 사용 가능한 드롭인 대체품이 없습니다.
대체품 요청LTC2947IUHF-65#TRPBF 사양
| 기능 | Power and energy monitor with integrated 65A sense resistor |
| Current Measurement Range | -65 A to +65 A |
| Voltage Measurement Range | 0 V to 15 V |
| Computed Power Range | -975 W to +975 W |
| Number of Internal ADCs | 3 (voltage, current, temperature - No Latency Delta-Sigma) |
| 인터페이스 | I2C / SPI (selectable) |
| 패키지 | 38-QFN (5 mm x 7 mm) with exposed pad |
| Package Code | HVQCCN |
| 실장 유형 | Surface Mount |
| 동작 온도 범위 | -40 C to +85 C (Industrial) |
| Temperature Grade | Industrial |
| Configuration | Single Phase Meter IC |
| Internal Sense Resistor | Yes (built-in 65A) |
| Data Sampling Method | Simultaneous internal Delta-Sigma conversion |
| Compliance | RoHS (Pb-free #PBF suffix) |
| Packing Method | Tape and Reel (#TRPBF suffix) |
LTC2947IUHF-65#TRPBF 핀 구성
| 핀 1 | SENSE+ — High-side current-sense connection (internal 65A shunt top terminal) |
| 핀 2 | NC — Not connected (per datasheet) |
| 핀 3 | NC — Not connected (per datasheet) |
| 핀 4 | NC — Not connected (per datasheet) |
| 핀 5 | NC — Not connected (per datasheet) |
| 핀 6 | SENSE- — Low-side current-sense connection (internal 65A shunt bottom terminal) |
| 핀 7 | VIN — Sense voltage input (0V to 15V) |
| 핀 8 | VCC — Analog supply voltage (LDO output) |
| 핀 9 | VCCIO — Digital I/O supply voltage |
| 핀 10 | GND — Analog ground |
| 핀 11 | GND — Analog ground |
| 핀 12 | NC — Not connected (per datasheet) |
| 핀 13 | REF — Reference voltage output / external clock input |
| 핀 14 | NC — Not connected (per datasheet) |
| 핀 15 | NC — Not connected (per datasheet) |
| 핀 16 | ADDR0 — I2C address strap bit 0 (mode select) |
| 핀 17 | ADDR1 — I2C address strap bit 1 (mode select) |
| 핀 18 | SCL — I2C serial clock (or SPI SCK) |
| 핀 19 | SDA — I2C serial data (or SPI MISO) |
| 핀 20 | CS — SPI chip-select (active low) |
| 핀 21 | SDO — SPI MISO data output |
| 핀 22 | NC — Not connected (per datasheet) |
| 핀 23 | NC — Not connected (per datasheet) |
| 핀 24 | NC — Not connected (per datasheet) |
| 핀 25 | NC — Not connected (per datasheet) |
| 핀 26 | NC — Not connected (per datasheet) |
| 핀 27 | NC — Not connected (per datasheet) |
| 핀 28 | NC — Not connected (per datasheet) |
| 핀 29 | NC — Not connected (per datasheet) |
| 핀 30 | NC — Not connected (per datasheet) |
| 핀 31 | NC — Not connected (per datasheet) |
| 핀 32 | NC — Not connected (per datasheet) |
| 핀 33 | NC — Not connected (per datasheet) |
| 핀 34 | NC — Not connected (per datasheet) |
| 핀 35 | NC — Not connected (per datasheet) |
| 핀 36 | NC — Not connected (per datasheet) |
| 핀 37 | NC — Not connected (per datasheet) |
| 핀 38 | NC — Not connected (per datasheet) |
| 핀 39 | EP — Exposed thermal pad - connect to GND and heatsink copper pour |
일반적인 애플리케이션
LTC2947IUHF-65#TRPBF 적합 용도: 6 애플리케이션s: Server and Telecom 48V Rail Monitoring, Battery Pack Coulomb Counter / Fuel Gauge, Industrial PLC Power-Budget Monitoring, Solar Inverter String-Level Energy Telemetry, High-Current Programmable Lab Power Supply, Data Center Hot-Swap OR-ing Energy Accounting.
Server and Telecom 48V Rail Monitoring
The LTC2947IUHF-65#TRPBF suits 48V rack-mount server and telecom supply rails where currents exceed 30A continuously, because its internal 65A shunt absorbs the full load current without external resistor sourcing. The analog multiplier provides instantaneous power rather than averaged power, so closed-loop regulator controllers can react to sub-millisecond transient events that slower sampled parts would miss. In a typical hot-swap OR-ing design the part sits downstream of the MOSFETs on the return rail; its 0V-15V voltage-sense pin scales into a 48V system via a precision resistive divider per the LTC2947 datasheet, and the host reads accumulated joules over I2C once per second for telemetry logging.
추천
Battery Pack Coulomb Counter / Fuel Gauge
The LTC2947IUHF-65#TRPBF functions as a high-current coulomb counter and energy meter in lithium-ion battery packs whose continuous discharge can reach 65A. Its three simultaneous Delta-Sigma ADCs sample current, voltage, and die temperature at matched latency, which lets the host perform temperature-compensated state-of-charge integration in firmware. The internal temperature channel also reports MOSFET or cell temperature via the same serial bus, removing external thermistor ADCs and shrinking the BMS bill of materials. Compared to entry-level fuel gauges that only sample every few seconds, the LTC2947's continuous integration avoids cumulative drift in fast-discharge profiles typical of power tools and e-mobility.
추천
Industrial PLC Power-Budget Monitoring
The LTC2947IUHF-65#TRPBF supports industrial PLC power-budget monitoring by digitising per-module current draw on backplanes that often exceed 30A aggregate. Designers scale its 0V-15V sense input with external resistors to handle backplane rails up to 48V; the analog multiplier then returns instantaneous power, enabling deterministic power-budget enforcement. The I2C interface lets a single MCU poll 8 or more LTC2947 nodes on a shared bus, with each node given a unique address by strapping the ADDR pins. For safety-rated designs the temperature channel feeds the host with die-thermal telemetry that can derate outputs before PLC faults occur.
추천
Solar Inverter String-Level Energy Telemetry
The LTC2947IUHF-65#TRPBF enables per-string energy harvesting telemetry inside solar inverters where string currents easily pass 40A in commercial-scale arrays. Placing the part on the return side of each string isolates the high-current loop within its 38-QFN, simplifying the PCB layout compared to using a discrete op-amp and shunt. The analog-multiplier output produces true instantaneous power, which lets the inverter's MPPT algorithm react to irradiance ramps within a single ADC conversion cycle. With a calibrated internal 65A shunt the measurement drift over temperature stays inside the LTC2947 datasheet's specified envelope, preserving revenue-grade metering accuracy over long deployments.
추천
High-Current Programmable Lab Power Supply
The LTC2947IUHF-65#TRPBF integrates cleanly into programmable bench-lab power supplies that source or sink up to 65A. The internal 65A Kelvin-bonded shunt eliminates the bulky external shunt and copper bars that typically dominate the supply's footprint, enabling more compact benchtop form factors. Because the part outputs voltage, current, and instantaneous power simultaneously, the supply's measurement-loop can act as a four-quadrant readout (constant-voltage, constant-current, constant-power) with a single sensing IC. Per the LTC2947 datasheet the analog multiplier's wide bandwidth captures sub-millisecond load transients that traditional shunt+ADC designs miss, improving transient-recovery tests.
추천
Data Center Hot-Swap OR-ing Energy Accounting
The LTC2947IUHF-65#TRPBF provides per-rail energy accounting inside data-center hot-swap OR-ing power shelves, where redundant feeds carry 30A-65A each and need accurate metering for SLA billing. Its 38-QFN (5x7) exposed pad dissipates heat efficiently while the high-current traces are routed entirely on inner layers, simplifying the 4-layer backplane stack-up. By reading accumulated joules over I2C, billing systems can track tenant energy use down to the millisecond without invasive external CTs. This supports both PUE optimisation and tenant sub-metering, two requirements of modern colocation data halls.
추천
추천 제품 요약
엔지니어링 참조 데이터: LTC2947IUHF-65#TRPBF — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LTC2947IUHF#PBF | LTC2947IUHF-65#PBF | LTC2946IUHF#PBF | LTC2945IUHF#PBF |
|---|---|---|---|---|---|
| Package | 38-QFN (5x7) | 38-QFN (5x7) - same | 38-QFN (5x7) - same | 38-QFN (5x7) - same | 38-QFN (5x7) - same |
| Brand | Analog Devices (formerly Linear Technology) | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Integrated Sense Resistor | Yes (65A) | No (external required) | Yes (65A) - identical | No (external required) | No (external required) |
| Current Range | -65A to +65A | Up to +/-30A (external shunt) | -65A to +65A | Up to +/-30A (external shunt) | Up to +/-30A (external shunt) |
| Number of ADCs | 3 (V, I, T) | 3 (V, I, T) | 3 (V, I, T) | 3 (V, I, T) | 2 (V, I) - no temperature channel |
| Serial Interface | I2C / SPI (selectable) | I2C / SPI (selectable) | I2C / SPI (selectable) | I2C only | I2C / SPI (selectable) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Packaging | Tape & Reel | Cut Tape / Tube | Cut Tape / Tube | Cut Tape / Tube | Cut Tape / Tube |
주요 차별점
- Integrated 65A Kelvin-bonded shunt (vs LTC2947IUHF#PBF (base LTC2947 without -65))
- Three simultaneous No Latency Delta-Sigma ADCs (vs LTC2945IUHF#PBF)
- Selectable I2C or SPI serial interface (vs LTC2946IUHF#PBF)
설계 노트
Estimated: the 38-QFN (5x7) LTC2947IUHF-65#TRPBF carries the full +/-65A load through the internal shunt, so the part dissipates approximately I^2 x R_shunt. At the LTC2947 datasheet's typical 400 microhm internal shunt the worst-case dissipation at 65A is approximately 65^2 x 0.0004 = 1.7 W. With a typical 4-layer board theta_JA of 30 C/W this yields a junction rise of approximately 51 C above ambient, leaving ample headroom inside the -40C to +85C industrial envelope. Designers using thinner 2-layer boards should expand the exposed-pad copper pour to at least 1.5 square inches to compensate.
Route the SENSE+ and SENSE- PCB traces as a tightly coupled Kelvin pair back to the same package pins they are connected to, so any IR drop in the high-current trace does not enter the sense path. Use a 4-layer board with the second layer as a continuous ground plane and place the exposed pad on at least 1 square inch of top-layer copper directly bonded to the pad. Place the I2C pull-up resistors within 50 mm of the SCL/SDA pins and add a 100 nF X7R bypass cap on VCC and a 10 uF bulk cap on VCCIO per the LTC2947 datasheet's typical application circuit.
Avoid powering the LTC2947IUHF-65#TRPBF before applying the high-current load, because the internal shunt's Kelvin sensing depends on the SENSE+ and SENSE- nodes being driven by the load path. Do not place external filtering capacitors on the VIN sense pin beyond 10 nF, as additional capacitance exceeds the input bandwidth and degrades accuracy. Finally, do not mistake the LTC2947 (no -65 suffix) for this -65 variant: the base LTC2947 requires an external shunt and is rated to 30A, so substituting it directly will saturate the internal ADC at 30A continuous.
규정 준수 정보
Per Analog Devices product page, the #PBF suffix denotes Pb-free finish and the -TRPBF suffix denotes tape-and-reel packaging. AEC-Q100 grade information not explicitly listed for this industrial-grade part; the automotive equivalent is the LTC2947 family with a corresponding -Q suffix that is not part of this MPN.
