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Texas Instruments LM3822MMX-2.0
- Part No.:
- LM3822MMX-2.0
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3822MMX-2.0.pdf
- Description:
- IC CURRENT GAUGE 2% 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,221
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Product details
Overview
LM3822MMX-2.0 from Texas Instruments is a precision high-side current gauge IC with an integrated 0.003Ω sense element, ±2.0A measurement range, PWM output encoding magnitude and direction, 50 ms sampling interval, and MSOP-8 package-designed for battery charge/discharge monitoring in portable power systems.
For engineers reviewing the LM3822MMX-2.0 datasheet, LM3822MMX-2.0 pinout, LM3822MMX-2.0 application, or LM3822MMX-2.0 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for current-sensing system design.
Technical Context
The LM3822MMX-2.0 implements a delta-sigma modulator to digitize sensed current, followed by digital filtering and comparison against a digital ramp generator to produce a proportional PWM waveform. Its 50 ms averaging window rejects transient spikes while maintaining DC accuracy.
Current direction and magnitude are encoded in duty cycle: 50% = zero current; >50% = positive flow; <50% = negative flow; full-scale ±2.0A maps to 4.5–95.5% duty cycle. The internal sense element's 2600 ppm/°C tempco is digitally compensated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sense Range | ±2.0 A continuous (factory-set variant; enables bidirectional load monitoring) |
| Insertion Loss | 0.003 Ω typical (minimizes power loss and thermal drift in high-current paths) |
| Accuracy | ±2% at room temperature (includes internal sense element tolerance and ADC linearity) |
| Sampling Interval | 50 ms (provides immunity to sub-50 ms transients; fixed timing for deterministic firmware integration) |
| PWM Frequency | 20 Hz nominal (12.5–25 Hz range; compatible with low-cost microcontroller input capture) |
| Supply Range | 2.0 V to 5.25 V (supports single-cell Li-ion to 5 V rail operation without level-shifting) |
| Shutdown Current | 1.8 µA typical (enables ultra-low-power sleep mode in battery-backed systems) |
Pinout & Package
LM3822MMX-2.0 is housed in an MSOP-8 package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SENSE+, VDD | High-side current terminal and supply input | Connects directly to high-side power rail; supplies internal circuitry and senses current via integrated shunt |
| 2: GND | Power ground reference | Return path for supply and internal analog/digital blocks; must be low-impedance for accuracy |
| 3: FLTR+ | Positive anti-aliasing filter input | Accepts external RC filter (with Pin 4) to limit bandwidth before delta-sigma conversion |
| 4: FLTR− | Negative anti-aliasing filter input | Completes differential filter network; rejects common-mode noise on sense path |
| 5: SD | Active-low shutdown control | Pull high for normal operation; drive low to reduce quiescent current to 1.8 µA |
| 6: TEST | Factory test pin | Must be tied to GND in production; floating or high may cause undefined behavior |
| 7: PWM | Digital current-encoded output | Open-drain logic-level PWM signal; duty cycle linearly represents average current over prior 50 ms |
| 8: SENSE− | Low-side current terminal | Completes internal sense path; connects to load side of high-side sensing point |
Key Features
| Feature | Design Value |
|---|---|
| No external sense resistor required | Eliminates board space, solder joint reliability risk, and calibration drift from discrete shunts |
| PWM output with direction encoding | Enables single-wire bidirectional current telemetry without additional ADC or polarity logic |
| Internal delta-sigma modulation + digital filtering | Provides inherent rejection of EMI and current spikes without external analog filters |
| Low temperature sensitivity | DC offset remains under 10 mA across −40°C to +85°C junction range for ±2.0A full scale |
| Power-on-reset (POR) circuit | Ensures defined startup state and prevents false PWM pulses during power ramp-up |
Applications
| Battery Charge/Discharge Gauge | Motion Control Diagnostics |
|---|---|
Use Scenario: Monitoring charge/discharge current in handheld medical devices with dual-cell Li-ion packs. IC Role / Device Role / Timing Role: High-side current gauge providing bidirectional PWM-encoded current data to MCU every 50 ms. Use Value: Enables accurate state-of-charge estimation and overcurrent protection without adding series resistance or PCB area. | Use Scenario: Detecting motor stall and phase imbalance in BLDC driver modules for industrial actuators. IC Role / Device Role / Timing Role: Real-time current monitor feeding PWM duty cycle into fault-detection firmware with 50 ms latency. Use Value: Identifies abnormal current draw before thermal damage occurs, using only one digital input pin per channel. |
| Power Supply Load Monitoring | Resettable Smart Fuse |
Use Scenario: Tracking dynamic load current in FPGA-based edge computing modules with 3.3 V and 1.2 V rails. IC Role / Device Role / Timing Role: High-side sensor on each rail delivering averaged current via PWM to supervisory microcontroller. Use Value: Supports adaptive power budgeting and early warning of aging capacitors or shorting components. | Use Scenario: Replacing mechanical fuses in USB-C PD power delivery circuits with programmable trip thresholds. IC Role / Device Role / Timing Role: Precision current monitor triggering MCU-controlled MOSFET cutoff when sustained >1.9 A is detected. Use Value: Enables auto-recovery after fault clearance and eliminates fuse replacement logistics in field-deployed equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA219BIDR | I²C interface, 16-bit ADC, ±32 V common-mode, no internal sense element | Requires external shunt; supports higher voltage rails but adds BOM cost and layout complexity | Choose when digital bus communication and wide common-mode range are prioritized over minimal footprint and zero-shunt simplicity |
| MAX40056AUT+T | Zero-drift amplifier + comparator output, 2.7 V to 5.5 V, ±100 mV input range | Analog output requires external ADC; lacks built-in averaging or direction encoding | Choose when sub-millisecond response time is critical and firmware can handle analog signal processing |
Compared with INA219BIDR and MAX40056AUT+T, the LM3822MMX-2.0 uniquely integrates the sense element and PWM encoder in an MSOP-8, eliminating external components and simplifying firmware-ideal for cost-sensitive, space-constrained, bidirectional current monitoring where 50 ms update rate is acceptable.
Availability
LM3822MMX-2.0 is available at Aetrix Electronics and suitable for battery management, motion control diagnostics, and smart fuse applications requiring stable component supply and long-term industrial availability.
Supply support for LM3822MMX-2.0 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision signal conditioning and power management ICs.
The LM3822 product line was designed specifically for high-accuracy, low-loss current sensing in portable and battery-powered systems-emphasizing integration, ease of use, and robustness in real-world thermal and noise environments.
FAQ
What is the full-scale current range of the LM3822MMX-2.0?
The LM3822MMX-2.0 is factory-configured for a ±2.0 A continuous current sensing range. This means it accurately measures bidirectional current from −2.0 A to +2.0 A, with 50 ms averaging and PWM output scaling from 4.5% (−2.0 A) to 95.5% (−2.0 A). It is distinct from the LM3822MMX-1.0 variant, which is set to ±1.0 A.
How does the LM3822MMX-2.0 encode current direction and magnitude?
The LM3822MMX-2.0 encodes both current direction and magnitude in its PWM output duty cycle: 50% duty cycle indicates zero current; values above 50% represent positive current flow (up to 95.5% at +2.0 A); values below 50% represent negative current flow (down to 4.5% at −2.0 A). The relationship is linear and defined by ISENSE = 2.2 × (D − 0.5) × 2.0 A, where D is the measured duty cycle.
Does the LM3822MMX-2.0 require an external current sense resistor?
No, the LM3822MMX-2.0 does not require an external current sense resistor. It integrates a precision 0.003 Ω internal sense element optimized for high-side placement. This eliminates external component cost, board area, solder joint reliability concerns, and calibration drift associated with discrete shunts-making LM3822MMX-2.0 a true single-chip current gauge solution.
What is the purpose of the FLTR+ and FLTR− pins on the LM3822MMX-2.0?
The FLTR+ and FLTR− pins on the LM3822MMX-2.0 form a differential input for an external RC anti-aliasing filter. This filter limits bandwidth before the delta-sigma modulator, preventing aliasing of high-frequency noise or switching artifacts into the measured current value. A typical 0.1 µF ceramic capacitor between these pins is specified in the datasheet to ensure stable operation and optimal noise rejection.
Can the LM3822MMX-2.0 operate from a 2.0 V supply?
Yes, the LM3822MMX-2.0 operates from a minimum supply voltage of 2.0 V, as confirmed in its Operating Ratings. It functions across 2.0 V to 5.25 V, making it compatible with single-cell Li-ion (2.7–4.2 V), LiFePO₄ (2.0–3.6 V), and regulated 3.3 V or 5 V rails. At 2.0 V, PWM output logic levels meet VOL ≤ 0.2 V and VOH ≥ VDD − 0.2 V under specified load conditions.
LM3822MMX-2.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Current Gauge
- Sensing Method:
- High-Side
- Accuracy:
- ±2%
- Voltage - Input:
- 2V ~ 5.5V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LM3822MMX-2.0 FAQ
1.How can I place an order for LM3822MMX-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3822MMX-2.0 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM3822MMX-2.0 reliable?
The price and inventory of LM3822MMX-2.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3822MMX-2.0 is usually 5 days.
3.What payment methods are accepted for LM3822MMX-2.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3822MMX-2.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3822MMX-2.0?
LM3822MMX-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3822MMX-2.0 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM3822MMX-2.0?
For technical support, including LM3822MMX-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3822MMX-2.0 requirements.
6.How does Aetrix verify that LM3822MMX-2.0 is sourced from the original manufacturer or authorized distributors?
All LM3822MMX-2.0 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM3822MMX-2.0 meets industry standards.
7.What is the process for return or replacement of LM3822MMX-2.0?
All LM3822MMX-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM3822MMX-2.0, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM3822MMX-2.0 part is unused and in its original packaging.
Return procedure for LM3822MMX-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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