INA790A-Q1 - 110V 75ARMS Ultra-Precise Current Sense Amp | TI
MPN: INA790A-Q1 ✓ NakahandaINA790A-Q1 Ulas
What is a current-sense amplifier? A current-sense amplifier is an analog IC that measures the voltage across a shunt resistor placed in series with a load and amplifies the small differential voltage into a ground-referenced output proportional to load current. Current-sense amplifiers sit within the signal-chain hierarchy as follows: current-sense amplifier -> instrumentation amplifier -> analog amplifier -> power management analog IC. INA790A-Q1 belongs to the integrated-shunt subfamily, where the shunt resistor and the gain stage are co-packaged, eliminating PCB layout-induced Kelvin errors and parasitic resistance drift that plague discrete solutions.
Key features include a -4V to +110V wide common-mode range that survives load-dump and cold-crank transients in 48V automotive rails, 75ARMS continuous current handling, enhanced PWM rejection that suppresses large dv/dt common-mode steps from switching power stages, 1.3 MHz bandwidth for fast transient response, and a low 35 ppm/degrees C maximum temperature drift enabled by the chopper-stabilized architecture. The integrated 400 micro-ohm shunt eliminates external resistor stocking, drift concerns, and board-space overhead.
The INA790A-Q1 uses a zero-drift chopper architecture that modulates the input offset voltage to a higher frequency, samples the modulation envelope, and feeds back to cancel the original offset. This technique virtually eliminates the 1/f noise corner and the offset drift that limit conventional current-sense amplifiers in high-precision DC and slow-varying measurements.
Typical applications include 48V automotive BLDC motor phase current sensing, server and telecom hot-swap controller current monitors, industrial solenoid and actuator current feedback, solar inverter string current measurement, and battery management system (BMS) pack-current sensing. The AEC-Q100 Grade 1 qualification and PWM rejection make it specifically tailored to inverter and motor-drive environments.
When designing with this device, place the INA790A-Q1 in the Kelvin path as close to the load current shunt as possible. Because the shunt is internal, the only PCB layout concern is keeping high-current traces off the analog ground return. Use the REF pin to level-shift the output for bidirectional sensing into an ADC with a ground-referenced input.
This page synthesizes TI datasheet parameters, DigiKey pricing, INA790A vs INA790B comparison, and practical design notes not found in the manufacturer datasheet alone.
Mga alternatibo na pwedeng ilagay na INA790A-Q1 — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
INA790A
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
INA790BIDEKR
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
INA790AIDEKR
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
INA2290A
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
INA790AIDGSR
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
INA790A-Q1 Mga Pinakamataas na Rating at Electrical Characteristics
| Product Type | Integrated-shunt current-sense amplifier |
| Common-Mode Input Range | -4 V to +110 V |
| Continuous RMS Current | 75 A (ARMS) |
| Internal Shunt Resistance | 400 micro-ohm |
| Bandwidth | 1.3 MHz |
| Temperature Drift | +/-35 ppm/degrees C |
| Type ng Output | Voltage output, bidirectional |
| Temperature na Operasyon | -40 degrees C to +125 degrees C |
| Packhaging | 15-VSON (DEK) 6x6 mm with thermal pad |
| PWM Rejection | Enhanced (dv/dt suppression) |
| Architecture | Zero-drift chopper-stabilized |
| Direction | Bidirectional (with REF pin level-shift) |
| Automotive Qualification | AEC-Q100 Grade 1 (Q1 suffix) |
| Uri ng Pagpapasok | Surface Mount |
| Bilang ng Pin | 15 |
Pin Configuration ng INA790A-Q1
| Pin 1 | GND — Analog ground reference for amplifier and REF pin |
| Pin 2 | REF — Reference input for output level-shift (set to VREF for bidirectional zero) |
| Pin 3 | VS — Positive supply voltage (e.g. +5V) |
| Pin 4 | OUT — Amplified output voltage proportional to load current |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | IN+ — Internal Kelvin connection to shunt high side |
| Pin 7 | IN- — Internal Kelvin connection to shunt low side |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | NC — Not connected (per datasheet) |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | PAD — Exposed thermal pad - solder to PCB ground copper pour |
Tipikal na mga Gamit
INA790A-Q1 ay nararapat para sa 7 aplikasyons: 48V Automotive BLDC Motor Phase Current Sensing, Server / Telecom 48V Hot-Swap Current Monitor, Industrial Solenoid and Actuator Current Feedback, Solar Inverter String Current Measurement, Battery Management System (BMS) Pack-Current Sensing, Drone ESC (Electronic Speed Controller) Current Monitor, Electric Vehicle DC-Link Current Sensing.
48V Automotive BLDC Motor Phase Current Sensing
The INA790A-Q1 is ideally suited to 48V BLDC motor phase current sensing where its 110V common-mode range survives the inverter's switching transients that swing between -12V and +110V, and the integrated 400 micro-ohm shunt eliminates PCB Kelvin layout errors that degrade discrete current-shunt solutions. The enhanced PWM rejection suppresses the large dv/dt common-mode steps generated by the FET bridge at each PWM edge, so the output settles cleanly within one switching period. AEC-Q100 Grade 1 qualification covers the -40 degrees C to +125 degrees C automotive underhood operating range. Designers place the INA790A-Q1 near each phase leg with the internal shunt carrying the phase current directly.
Inirekomenda
Server / Telecom 48V Hot-Swap Current Monitor
In server and telecom -48V (or +48V) hot-swap controllers the INA790A-Q1 provides continuous current telemetry directly into the BMC ADC, replacing discrete op-amp plus external shunt designs. The 110V common-mode range comfortably exceeds typical 48V bus transients including surge and ringing, while the 75ARMS continuous rating handles blade-server peak currents. The chopper-stabilized zero-drift amplifier holds gain accuracy within +/-35 ppm/degrees C across the full operating range, enabling precise I^2t fuse emulation in software. Reference the REF pin to 2.5V to bipolar-center the output across the ADC's input range.
Inirekomenda
Industrial Solenoid and Actuator Current Feedback
Industrial solenoid drivers and proportional valves demand accurate current feedback to maintain closed-loop force or position control. The INA790A-Q1's enhanced PWM rejection tolerates the aggressive high-side PWM switching used to regulate solenoid current, while the integrated shunt minimizes the PCB footprint required to sense each actuator. Bidirectional sensing accommodates H-bridge actuator drives where current flows in both directions during active braking. AEC-Q100 qualification is a bonus for industrial customers who leverage automotive-grade parts to extend Mean Time Between Failure (MTBF) in harsh factory environments.
Inirekomenda
Solar Inverter String Current Measurement
Solar string inverters require per-string current sensing for Maximum Power Point Tracking (MPPT) and fault detection. The INA790A-Q1's 110V common-mode range handles open-circuit panel voltages well above the inverter's MPPT window, and the integrated 400 micro-ohm shunt saves PCB space compared to discrete solutions. The chopper-stabilized amplifier eliminates calibration drift across the diurnal temperature cycle of an outdoor inverter enclosure. With 75ARMS continuous current rating it covers all residential and most commercial string-current levels without paralleling devices.
Inirekomenda
Battery Management System (BMS) Pack-Current Sensing
In Battery Management Systems the INA790A-Q1 provides high-side pack current sensing with bidirectional measurement for charge and discharge coulomb counting. The 110V common-mode range spans 12V, 24V, and 48V nominal packs with margin, while the +/-35 ppm/degrees C drift over -40 degrees C to +125 degrees C preserves state-of-charge accuracy without periodic recalibration. The integrated shunt removes a common failure point - external sense resistors are subject to thermal stress and solder-joint fatigue, both eliminated by the INA790A-Q1's internal Kelvin design.
Inirekomenda
Drone ESC (Electronic Speed Controller) Current Monitor
In brushless drone Electronic Speed Controllers the INA790A-Q1 provides per-motor current feedback to the flight controller for torque estimation and motor-health monitoring. The 110V common-mode range handles LiPo packs up to 22S (over 90V fully charged) and the load-dump transients of propeller braking. The 75ARMS rating covers the largest commercial motors including multi-rotor agricultural drones. AEC-Q100 qualification supports industrial-grade UAV deployments where reliability over a multi-year service life is critical.
Inirekomenda
Electric Vehicle DC-Link Current Sensing
Electric vehicle traction inverters and DC-DC converters require robust current sensing on the 400V or 800V DC-link for control loops and diagnostics. The INA790A-Q1's 110V common-mode range is insufficient for traction inverters but is ideal for 48V mild-hybrid DC-DC converters and 12V/48V auxiliary rails. Designers use the INA790A-Q1 in current-shunt mode around the LV battery cable to monitor pack current during cranking, regenerative braking, and idle conditions.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for INA790A-Q1 — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | INA790A | INA790BIDEKR | INA790AIDEKR | INA2290A | INA790AIDGSR |
|---|---|---|---|---|---|---|
| Package | 15-VSON (DEK) 6x6 mm | 15-VSON (DEK) 6x6 mm - same | 15-VSON (DEK) 6x6 mm - same | 15-VSON (DEK) 6x6 mm - same | 15-VSON (DEK) 6x6 mm - same | 15-VSON (DEK) 6x6 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| AEC-Q100 Qualified | Yes (Q1 suffix) | No | Yes (Q1 implied by IDEKR) | Yes (Q1 implied by IDEKR) | Yes (automotive) | No (IDGSR grade) |
| Common-Mode Range | -4V to +110V | -4V to +110V | -4V to +110V | -4V to +110V | -4V to +110V | -4V to +110V |
| RMS Current Rating | 75 A (ARMS) | 75 A | 75 A | 75 A | 100 A (higher current class) | 75 A |
| Bandwidth | 1.3 MHz | 1.3 MHz | Higher (~1.5 MHz, B variant) | 1.3 MHz | Similar class | 1.3 MHz |
| Temperature Drift | +/-35 ppm/degrees C | +/-35 ppm/degrees C | +/-35 ppm/degrees C | +/-35 ppm/degrees C | Comparable | +/-35 ppm/degrees C |
| Direction | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional |
| PWM Rejection | Enhanced | Enhanced | Enhanced | Enhanced | Enhanced | Enhanced |
| Price (qty 100, USD) | $5.20 | Lower (no Q1 premium) | Slight premium (higher BW) | Comparable | Higher (higher current class) | Lower (no Q1) |
Pangunahing mga Pagkakaiba
- Integrated 400 micro-ohm calibrated shunt eliminates external resistor (kumpara saINA240 (requires external shunt))
- Automotive AEC-Q100 Grade 1 qualification (kumpara saINA790A (industrial grade only))
- Enhanced PWM rejection suppresses dv/dt common-mode steps (kumpara saINA181 (basic PWM rejection))
Talaan ng Disenyo
Because the INA790A-Q1 integrates the 400 micro-ohm Kelvin-connected shunt, the only PCB layout concern is routing the high-current load current through the package's exposed IN+/IN- pins without injecting additional resistance from copper trace. Estimated: trace length 5mm at 1 oz copper adds ~1.4 mOhm which is 350x smaller than the internal shunt and therefore negligible. Solder the exposed thermal pad to a copper pour of at least 1 square inch to keep junction temperature under the 125 degrees C limit when carrying the full 75ARMS continuous load.
The INA790A-Q1 is a current-sense amplifier, not a power regulator: it dissipates negligible power through the internal shunt (estimated P = I^2 x Rshunt = 75^2 x 0.0004 = 2.25W worst case at 75ARMS). Provide an external low-noise supply for the VS pin such as a TPS7A47 LDO; switching-regulator ripple directly degrades the sense output via PSRR. Decouple VS with a 1 uF X7R ceramic placed within 2 mm of the VS pin.
The REF pin sets the zero-current output voltage and must be driven from a low-impedance source such as a buffered DAC or a resistive divider bypassed with a 100 nF capacitor. Floating REF causes the output to drift with leakage currents and makes bidirectional calibration impossible. The OUT pin output impedance should be buffered if driving a long trace or ADC input capacitance greater than 50 pF; otherwise add a 100 ohm series resistor at OUT to isolate capacitive loads.
Impormasyon ng Pagsunod sa Kautusan
AEC-Q100 Grade 1 qualified (Q1 suffix). RoHS and REACH compliant per TI product page. Lead-free and halogen-free per MSL classification. Conflict-minerals compliant per TI supply chain disclosures.
