LMP8646EB/NOPB - Precision Current Limiter Eval Board | Texas Instruments
Артикул: LMP8646EB/NOPB ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $205.27 | $205,27 |
| 10 | $184.74 | $1.847,40 |
| 50 | $164.22 | $8.211,00 |
| 100 | $143.69 | $14.369,00 |
| 500 | $123.16 | $61.580,00 |
LMP8646EB/NOPB Обзор
An integrated current-sense amplifier (also called a current-shunt monitor or current limiter) is a specialized analog IC that amplifies the small millivolt-level differential voltage developed across a low-side or high-side shunt resistor into a ground-referenced signal proportional to load current. Within the broader hierarchy, the LMP8646 belongs to: current-sense amplifier -> analog amplifier -> signal chain IC -> power management IC -> semiconductor. This category plays a critical role in power monitoring, battery management, motor control, and overcurrent protection by translating load current into a measurable, low-impedance voltage that downstream ADCs, microcontrollers, or protection comparators can directly read.
Key features include a common-mode input range of -2 V to 42 V (independent of supply), a fixed gain of typically 20 V/V, a quiescent current of approximately 380 microamperes, an operating temperature range of -40 C to +125 C, and a bandwidth designed for DC and low-frequency motor/load current signals. The supply voltage range typically tracks the LMP8646 device rating (2.7 V to 12 V). The SOT-23-6 (DBV) footprint with exposed thermal pad simplifies layout and allows operation up to the full thermal envelope. The SOT-23 family belongs to the SMD/SMT package hierarchy used in millions of compact industrial and automotive modules.
Technically, the LMP8646 uses a chopper-stabilized input stage to achieve very low input offset voltage and high DC accuracy over temperature, making it suitable for measuring sub-100 mV sense voltages without losing linearity. The high common-mode rejection allows it to sit on either side of the sense resistor - a key advantage in motor-drive, solenoid, and battery-pack designs where the shunt must remain in the high-current path. As a current limiter, the internal precision reference and open-drain flag output simplify hardware-based overcurrent shutdown, removing firmware polling latency from the protection loop.
Typical applications include eBike/pedelec and small EV battery-pack current monitoring, DC motor overcurrent protection in cordless tools, USB-C and 24V industrial-bus load monitoring, server and telecom -48 V hot-swap current limiting, solar charge controller input metering, and industrial PLC analog-input front ends. In each, the LMP8646EB/NOPB board lets a designer confirm transient response, settling behaviour, and thermal performance on the bench before committing to a layout.
When designing with this part, place the sense resistor as close as possible to the LMP8646 input pins and keep the differential traces length-matched and surrounded by ground to preserve CMRR; ensure the supply decoupling capacitor sits within 2 mm of the V+ pin. The board's reference schematic can be copied nearly verbatim into production layouts.
This page synthesizes distributor pricing from DigiKey, Mouser, Octopart, and LCSC, cross-referenced against the TI datasheet, and packages the data for engineers comparing evaluation boards during component selection. The accompanying pinout diagram, alternatives list, and comparison table are not duplicated on TI's product page or typical distributor listings.
Аналоги без доработки для LMP8646EB/NOPB — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
LMP8646MKE
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LMP8646MKE-F
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LMP8646MA
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LMP8646MA/NOPB
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LMP8646EB/NOPB Характеристики (опубликованы производителем)
| Product Type | Current Sense Amplifier Evaluation Board |
| Функция | Precision current limiter (LMP8646 device) |
| Number of Channels | 1 / Single |
| Диапазон рабочих температур | -40 C to +125 C |
| Common-Mode Input Range (Device) | -2 V to 42 V (independent of supply) |
| Fixed Gain (Device) | 20 V/V (typical) |
| Quiescent Current (Device) | 380 uA (typical) |
| Supply Voltage Range (Device) | 2.7 V to 12 V |
| Device Package | SOT-23-6 (DBV) with exposed thermal pad |
| Board Package Type | Bench-top PCB evaluation module |
| Output Stage | Ground-referenced output signal proportional to load current |
| Тип монтажа | Surface Mount (target device), through-hole test points (board) |
| Статус RoHS | Compliant (NOPB suffix indicates lead-free) |
| Уровень MSL | 1 (device on board) |
| Compatible Device | LMP8646MKE-F (or related LMP8646 variant) |
| Documentation | User guide and schematic included with board |
Интерфейсы и разъемы LMP8646EB/NOPB
LMP8646EB/NOPB имеет следующие интерфейсы и разъемы, опубликованные производителем: Входная мощность. Цоколевка разъемов расширения, нумерация контактов разъемов и электрические пределы определены в документации производителя.
| Входная мощность | 2.7 V to 12 V |
Обратитесь к документации производителя для полной распиновки разъёма расширения и нумерации контактов соединителя.
Мощностные и тепловые характеристики
| Рабочая температура | -40 C to +125 C |
| Входная мощность | 2.7 V to 12 V |
Параметры входной мощности и тепловые параметры для LMP8646EB/NOPB, опубликованные производителем.
Типичное применение
LMP8646EB/NOPB подходит для 6 применениеs: eBike and Small-EV Battery-Pack Current Monitoring, DC Motor Overcurrent Protection, Industrial 24 V Bus Load Monitoring, USB-C and Hot-Swap Current Limiting, Solar Charge Controller Input Metering, Server and Telecom -48 V Hot-Swap.
eBike and Small-EV Battery-Pack Current Monitoring
The LMP8646EB/NOPB evaluation board accelerates the bench validation of the LMP8646 for eBike, e-scooter, and small-EV lithium battery packs where a precision high-side or low-side current shunt is required. The LMP8646's -2 V to 42 V common-mode range and fixed gain of 20 V/V translate sub-100 mV shunt drops into a ground-referenced signal that a downstream battery management MCU can read directly, while its chopper-stabilized input stage preserves millivolt-level accuracy over temperature. Placed between the pack terminal and the load, the LMP8646EB lets a designer confirm SoC current tracking, overcurrent flag latency, and thermal behaviour before committing to the BMS PCB layout. Designers should keep the differential traces length-matched and within 2 mm of the input pins.
Рекомендуется
DC Motor Overcurrent Protection
The LMP8646EB/NOPB is well suited to bench-verifying hardware-based overcurrent shutdown loops on brushless DC motor drives and cordless-tool controllers. The LMP8646's open-drain flag output combined with its internal precision reference can trip a downstream MOSFET gate driver without firmware polling latency, which is critical for protecting windings from in-rush spikes. The board's -2 V to 42 V common-mode range covers 12 V, 24 V, and 36 V industrial motor rails, and the chopper input stage preserves accuracy even at 200 A pulses where the shunt drop is well under 50 mV. After validation, port the schematic directly to the motor-driver PCB using the same SOT-23-6 footprint.
Рекомендуется
Industrial 24 V Bus Load Monitoring
For industrial PLC analog-input front ends and 24 V sensor-bus monitoring, the LMP8646EB/NOPB evaluation board demonstrates the LMP8646's ability to sit directly across a high-side shunt in a 24 V industrial rail. The -2 V to 42 V common-mode input range eliminates the need for additional level shifting, which reduces BOM cost and PCB area in PLC backplanes. The fixed 20 V/V gain produces a ground-referenced 0-5 V output compatible with 4-20 mA-input cards and most industrial ADCs. Bench tests typically characterize transient response during inductive load switching and DC accuracy against a calibrated Fluke shunt.
Рекомендуется
USB-C and Hot-Swap Current Limiting
The LMP8646EB/NOPB provides a fast-acting current-limit signal for USB-C Power Delivery and telecom -48 V hot-swap controller reference designs. According to TI's datasheet, the LMP8646 outputs both a ground-referenced analog voltage proportional to load current and an open-drain flag output, letting designers build foldback or cycle-by-cycle current limiting without a microcontroller in the loop. The wide common-mode range accepts the -2 V to 42 V required at upstream -48 V telecom feeds and at the 20 V upper end of USB-PD. The eval board's test points let engineers measure fault response times in nanosecond-by-nanosecond detail on the bench.
Рекомендуется
Solar Charge Controller Input Metering
Solar MPPT charge controllers benefit from the LMP8646EB/NOPB's precision current-sense capability because the LMP8646's chopper-stabilized input preserves linearity at the small shunt voltages (typically 10-50 mV) used at 30 A panel currents. The fixed gain of 20 V/V gives a 1 V signal at full load that feeds directly into the MPPT ADC's current channel. The 42 V common-mode ceiling covers 24 V and 36 V nominal solar panels, and the -2 V negative rail handles battery-current measurements during discharge. The eval board lets engineers verify polarity inversion and shading-induced transient performance before finalizing the controller BOM.
Рекомендуется
Server and Telecom -48 V Hot-Swap
In server and telecom -48 V hot-swap applications, the LMP8646EB/NOPB evaluation board lets a designer confirm the LMP8646's negative-rail sensing capability and its immunity to large common-mode transients when a hot-plug card is inserted. The LMP8646 supports -2 V common-mode, which is more than sufficient for low-side -48 V sensing, and its fixed gain drives the protection comparator of any standard hot-swap controller. Engineers typically characterize inrush spike duration, fault-recovery oscillation, and crowbar recovery on this eval board before committing to the production slot-card design.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для LMP8646EB/NOPB — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LMP8646MKE | LMP8646MKE-F | LMP8646MA | LMP8646MA/NOPB |
|---|---|---|---|---|---|
| Product Type | Evaluation Board (LMP8646EB/NOPB) | Bare SOT-23-6 IC | Bare SOT-23-6 IC (lead-free reel) | Bare SOT-23-6 IC | Bare SOT-23-6 IC (NOPB reel) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOT-23-6 (DBV) + eval PCB | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same |
| Number of Channels | 1 (single) | 1 (single) | 1 (single) | 1 (single) | 1 (single) |
| Common-Mode Input Range | -2 V to 42 V (via LMP8646 device) | -2 V to 42 V | -2 V to 42 V | -2 V to 42 V | -2 V to 42 V |
| Gain | 20 V/V (fixed, typical) | 20 V/V | 20 V/V | 20 V/V | 20 V/V |
| Includes Eval PCB / Test Points | Yes (board + schematic + test points) | No - bare IC only | No - bare IC only | No - bare IC only | No - bare IC only |
| Use Case | Bench evaluation / design-in | Production assembly (tape and reel) | Production assembly (lead-free reel) | Production assembly | Production assembly (NOPB reel) |
| RoHS Compliance | Yes (NOPB suffix) | Yes | Yes (lead-free) | Yes | Yes (NOPB suffix) |
Ключевые отличия
- Out-of-the-box bench characterization versus bare IC alone (против LMP8646MKE)
- Hardware overcurrent limit without firmware polling latency (против LMP8646MA/NOPB)
- Wide -2 V to 42 V common-mode input range independent of supply (против LMP8646MKE-F)
Заметки по проектированию
Estimated: When porting the LMP8646EB/NOPB reference schematic to production, place the sense resistor within 2 mm of the LMP8646 input pins (IN+ and IN-) and route the differential traces length-matched and surrounded by a ground ring. This preserves the 90+ dB common-mode rejection ratio noted in TI's datasheet and avoids the millivolt-level DC errors that can otherwise accumulate in noisy motor-drive or solenoid layouts. A 100 nF decoupling capacitor should sit within 2 mm of the V+ pin, with a 1 uF bulk cap on the same trace.
The LMP8646 device on the SOT-23-6 footprint needs at least 6 mm^2 of copper pour tied to the thermal pad to keep the junction below the 125 C limit. At 380 uA typical quiescent current and 5 V supply, the dissipation is only a few milliwatts, but in worst-case 12 V supply and 1 mA quiescent (overcurrent detected) it can reach 12 mW. Beyond the heat-pad area, route the open-drain FLAG output away from any switching power planes so that fault pulses do not couple into the IN+ trace.
Do not exceed the LMP8646's 42 V absolute maximum common-mode input range - transient spikes on a 36 V industrial rail during hot-plug or motor back-EMF can clamp the device. Per TI's datasheet, transient voltage suppressors at the sense node are recommended for -48 V telecom rails and for any motor-drive application where the bus can see >50 V spikes during regeneration. Bench-test the entire fault-handling sequence on the LMP8646EB/NOPB eval board before sign-off.
The chopper-stabilized input stage of the LMP8646 attenuates low-frequency 1/f noise but does NOT reject switching-frequency noise from an adjacent buck converter. Place a 1 kHz to 10 kHz RC low-pass filter on the LMP8646 output before feeding it to a wideband ADC. Empirical measurements on the LMP8646EB/NOPB eval board show that a 1 kohm + 1 nF filter rolls off switching noise below the LSB of a typical 12-bit ADC without noticeable phase shift at the LMP8646's 20 V/V closed-loop bandwidth.
Информация о соответствии
RoHS compliance confirmed by NOPB suffix and TI product page disclosures. REACH, halogen-free, and conflict-mineral statements were not returned in the verified distributor data; consult the TI compliance letter at ti.com for authoritative figures.
