INA228AIDGSR - 85V 20-bit I2C Power Monitor | Texas Instruments
Артикул: INA228AIDGSR ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.36 | $336,00 |
| 500 | $2.94 | $1.470,00 |
| 1.000 | $2.52 | $2.520,00 |
INA228AIDGSR Обзор
An I2C power monitor is a class of analog front-end IC that digitizes the voltage across a current-sense shunt and the supply rail, then performs on-chip arithmetic to expose current, power, energy and charge over a digital bus. The INA228 belongs to the power monitor -> current sense amplifier -> power management IC -> semiconductor hierarchy, and it is commonly deployed as the housekeeping companion to a switching DC-DC converter or a battery stack, where designers need cycle-by-cycle telemetry without burdening the host MCU with analog sampling.
Key features include 20-bit delta-sigma ADC core, 85 V common-mode rating, programmable gain, alert functionality for over-current or under-voltage events, on-chip temperature sensor, and 50 uA typical quiescent current. The 10-pin VSSOP (DGS) package provides a small footprint suitable for point-of-load monitoring on dense PCBs.
Technically, the device combines a high-impedance front end, precision chopper-stabilized amplifiers, and a sigma-delta modulator that oversamples the differential shunt voltage. The on-chip calibration register compensates for offset and full-scale error, and the integrated temperature sensor supports system-level housekeeping. The high common-mode range allows direct connection across high-voltage battery stacks without intermediate attenuation.
Typical applications include server and telecom 48 V rails, battery management systems, industrial automation, solar power optimizers, and electric vehicle DC link monitoring. The wide 85 V common-mode range makes it suitable for high-voltage battery stacks.
When designing with this part, ensure the shunt resistor is sized to keep peak differential input within the device's dynamic range, and place the shunt close to the IC input pins to minimize ground-loop errors. Use the alert pin to wake the host MCU on threshold crossings instead of polling.
This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the manufacturer datasheet, giving engineers a faster path to selecting the right current-sense monitor for high-voltage rails.
Аналоги без доработки для INA228AIDGSR — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с INA228AIDGSR (тот же форм-фактор и посадочное место) — отличается по ADC Resolution, Function, Interface, Operating Temperature, Package.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
INA228AIDGST
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
INA226AIDGSR
✅ Прямая замена✓ В наличии
$1.21 / шт.
Открыть даташит →INA220BIDGSR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
INA238AIDGSR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
INA237AIDGSR
✅ Прямая замена✓ В наличии
$1.11 / шт.
Открыть даташит →INA228AIDGSR Характеристики
| Manufacturer | Texas Instruments |
| Series | INA228 |
| Функция | Current/Voltage/Power/Energy/Charge Monitor |
| Sensing Method | High-side / Low-side, Bidirectional |
| Accuracy | 0.1 % (typ, gain error) |
| Voltage - Input | 0 V to 85 V (common-mode, bus) |
| Рабочее напряжение питания | 2.7 V to 5.5 V |
| Output Interface | I2C |
| ADC Resolution | 20-bit |
| Ток покоя | 50 uA (typ) |
| Рабочая температура | -40 C to +125 C |
| Тип монтажа | Surface Mount |
| Корпус / Типоразмер | 10-VSSOP (DGS) |
| Pins | 10 |
| Alert Pin | Yes |
| Статус RoHS | Compliant |
Конфигурация выводов INA228AIDGSR
| Контакт 1 | A0 — I2C address select bit 0 |
| Контакт 2 | ALERT — Alert output (open-drain, active low) |
| Контакт 3 | GND — Ground |
| Контакт 4 | SDA — I2C data |
| Контакт 5 | SCL — I2C clock |
| Контакт 6 | VS — Bus voltage sense input |
| Контакт 7 | IN+ — Differential current sense, positive input |
| Контакт 8 | IN- — Differential current sense, negative input |
| Контакт 9 | VDD — Supply voltage (2.7 V to 5.5 V) |
| Контакт 10 | A1 — I2C address select bit 1 |
Типичное применение
INA228AIDGSR подходит для 6 применениеs: 48 V Telecom and Server Rail Monitoring, Battery Management System Telemetry, Solar String Current and Power Monitoring, Industrial PLC and Factory Automation, Electric Vehicle DC Link Monitoring, USB-PD and Point-of-Load Power Monitoring.
48 V Telecom and Server Rail Monitoring
The INA228AIDGSR's 85 V common-mode bus rating and 20-bit ADC make it ideal for direct current-sense telemetry on 48 V telecom and server rails. Placed in series with a 1 to 10 milliohm shunt between the 48 V backplane and the load, it simultaneously reports bus voltage, current and power over I2C, allowing the host BMC or MPU to perform real-time energy accounting. Unlike lower-voltage monitors such as the INA226, no external resistor divider is needed for the bus-sense path, simplifying the BOM. The 0.1 % gain error ensures the energy reading is within plus or minus 1 % at full load, which is essential for ASHRAE-class datacom PUE tracking and Tier-III server energy reporting.
Рекомендуется
Battery Management System Telemetry
In lithium-ion or LiFePO4 battery packs, the INA228AIDGSR monitors charge and discharge currents with the integrated coulomb counter and energy register, eliminating firmware-side integration drift. The 85 V rating supports 12S to 20S battery stacks commonly used in e-bikes and small EVs. Bidirectional sensing distinguishes charge from discharge events, and the alert pin can wake the BMS MCU on over-current conditions. Compared to a discrete op-amp plus MCU ADC, the INA228AIDGSR provides higher noise immunity and frees the MCU from sampling duties, which is critical during low-power sleep modes.
Рекомендуется
Solar String Current and Power Monitoring
The INA228AIDGSR's 85 V common-mode rating and bidirectional current sense make it suitable for individual photovoltaic string monitoring up to 80 V open-circuit. Placed in series with a low-ohm shunt at the string output, it reports string current, voltage, and instantaneous power to the inverter or data-acquisition MCU. The 20-bit ADC resolves the low-current pre-dawn state, helping detect string faults. Per the INA228 datasheet, the 50 uA quiescent current ensures negligible parasitic loss, an advantage in remote solar power optimizers where standby efficiency matters.
Рекомендуется
Industrial PLC and Factory Automation
In industrial PLCs and 24 V factory automation buses, the INA228AIDGSR adds precise current monitoring to detect short circuits, overloads, and field-wiring faults in real time. The wide 85 V input headroom tolerates industrial surge and transient events, while the integrated alert pin drives a hardware interrupt into the PLC controller. The 10-pin VSSOP package fits dense PLC I/O modules, and the industrial -40 C to +125 C temperature rating ensures operation in unconditioned control cabinets. The I2C bus allows daisy-chaining multiple monitors for multi-channel current acquisition.
Рекомендуется
Electric Vehicle DC Link Monitoring
In electric vehicle traction inverters and onboard chargers, the INA228AIDGSR measures the 48 V to 96 V DC link current directly across a high-current shunt. Its 85 V common-mode rating and 0.1 % gain error support accurate power-flow reporting between battery and inverter, enabling predictive range estimation. The wide operating temperature and small VSSOP footprint allow placement near the shunt without thermal derating. The device's alert pin can signal the BMS on over-current discharge events, supporting ISO 26262 functional-safety monitoring on auxiliary rails.
Рекомендуется
USB-PD and Point-of-Load Power Monitoring
In USB-PD chargers and high-current point-of-load converters, the INA228AIDGSR measures load current on the 5 V to 48 V output bus. The 20-bit ADC delivers sub-millamp resolution, useful for fast-charge protocol compliance testing. Placed near the output capacitor with a low-ohm sense resistor, the part reports VBUS voltage, load current, and accumulated charge to the PD controller. Compared to discrete op-amp circuits, the INA228AIDGSR shrinks the BOM and adds I2C diagnostics, which engineers can surface to the host over USB-PD messaging.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для INA228AIDGSR — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | INA228AIDGST | INA226AIDGSR | INA220BIDGSR | INA238AIDGSR | INA237AIDGSR |
|---|---|---|---|---|---|---|
| Package | 10-VSSOP (DGS) | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Common-Mode Bus Voltage | 85 V | 85 V | 36 V | 26 V | 85 V | 85 V |
| ADC Resolution | 20-bit | 20-bit | 16-bit | 12-bit | 16-bit | 16-bit |
| Operating Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 3.0 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Gain Error (typ) | 0.1 % | 0.1 % | 0.1 % | 0.5 % | 0.1 % | 0.1 % |
| Quiescent Current | 50 uA | 50 uA | 50 uA | 50 uA | 50 uA | 50 uA |
| Energy / Charge Accumulator | Yes | Yes | No | No | No | No |
Ключевые отличия
- 85 V common-mode bus voltage rating (против INA226AIDGSR)
- 20-bit ADC with on-chip energy and charge accumulator (против INA238AIDGSR)
- Bidirectional current sensing with single hardware alert output (против INA220BIDGSR)
Заметки по проектированию
Place the current-sense shunt as close as possible to the IN+ and IN- inputs to minimize ground-loop errors and parasitic inductance. Route the differential pair symmetrically with 0.5 mm spacing and avoid crossing power traces. Use a Kelvin connection to the shunt pads for best accuracy; long PCB traces add tens of milliohms that the device will read as current error. Estimated: at 1 A load through a 10 mm trace of 1 oz copper, the parasitic resistance is approximately 0.5 milliohm, equating to 0.5 mV extra error at full scale.
Decouple the VDD pin with a 100 nF ceramic capacitor placed within 1 mm of the IC, plus a 1 uF bulk capacitor. The VDD supply must be a low-noise source - any ripple above 50 kHz directly degrades the ADC's noise floor. If VDD is derived from the same high-voltage bus through an LDO, ensure the LDO has at least 30 dB PSRR at 100 kHz to avoid coupling switching noise into the ADC reference.
The I2C lines (SDA, SCL) and the open-drain ALERT pin require pull-up resistors sized by bus capacitance. For a 400 kHz bus with 10 nodes, use 2.2 kohm pull-ups; for a 1 MHz Fast-Mode Plus bus, use 1 kohm. Keep total bus capacitance below 100 pF to meet the rise-time spec. The ALERT pin can be wire-ORed across multiple INA228s on different I2C addresses, simplifying interrupt handling in multi-rail systems.
The 10-pin VSSOP package has a theta_JA of approximately 200 C/W per TI packaging data, so the device dissipates negligible power and does not require a heatsink. However, in environments above 100 C ambient, derate the bus-voltage slew rate to limit self-heating. Estimated: at 5 V VDD and 50 uA quiescent, the device dissipates 0.25 mW and self-heats by less than 0.05 C, which is negligible for most applications.
Информация о соответствии
RoHS and REACH compliance per DigiKey and TI product pages. Standard variant INA228AIDGSR is not AEC-Q100 qualified; for automotive applications, evaluate the automotive-grade part number INA228-Q1 separately.
