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Texas Instruments LM3822MM-2.0/NOPB
- Part No.:
- LM3822MM-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3822MM-2.0/NOPB.pdf
- Description:
- IC CURRENT GAUGE 2% 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,285
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Product details
Overview
LM3822MM-2.0/NOPB from Texas Instruments is a precision high-side current gauge IC with integrated 0.003Ω sense element, ±2.0A measurement range, PWM output encoding magnitude and direction, 50 ms sampling interval, and MSOP-8 package - used in battery charge/discharge monitoring and smart fuse applications.
For engineers reviewing the LM3822MM-2.0/NOPB datasheet, LM3822MM-2.0/NOPB pinout, LM3822MM-2.0/NOPB application, or LM3822MM-2.0/NOPB equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, and confirmed alternative options for current-sensing system design.
Technical Context
The LM3822MM-2.0/NOPB 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 is encoded via duty cycle relative to 50%: >50% indicates positive flow (up to +2.0A at 95.5%), <50% indicates negative flow (down to –2.0A at 4.5%), with quantization resolution of 1/1024 and inherent 0.5-bit offset corrected in post-processing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Full-Scale Range | ±2.0 A - supports bidirectional load current monitoring up to 2 A without external shunt. |
| Insertion Loss | 0.003 Ω typical - introduces negligible voltage drop and power loss in high-side sensing paths. |
| Accuracy | ±2% at room temperature - includes internal sense element tolerance and signal chain error, enabling reliable battery state-of-charge estimation. |
| Sampling Interval | 50 ms - provides immunity to sub-50 ms transients while delivering stable averaged current values for microcontroller polling. |
| PWM Frequency | 20 Hz nominal (12.5–25 Hz range) - compatible with low-cost GPIO input capture or RC filter + comparator interfaces. |
| Supply Range | 2.0 V to 5.25 V - operates directly from common logic rails including 3.3 V and 5 V systems. |
| Shutdown Current | 1.8 µA typical - enables ultra-low-power operation during system sleep or fault isolation. |
Pinout & Package
LM3822MM-2.0/NOPB is housed in an MSOP-8 (3.0 mm × 3.0 mm, 0.65 mm pitch) thermally enhanced surface-mount package with exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SENSE+, VDD) | High-side current input and supply rail | Connects to power source side of load; supplies IC and carries full load current through internal sense element. |
| 2 (GND) | Power ground reference | Return path for supply current and reference for internal analog/digital circuitry; must be low-impedance. |
| 3 (FLTR+) | Positive anti-aliasing filter input | Accepts filtered delta-sigma modulator input; requires 0.1 µF ceramic capacitor to FLTR− for noise rejection. |
| 4 (FLTR−) | Negative anti-aliasing filter input | Differential filter node; forms RC network with FLTR+ to suppress aliasing above Nyquist frequency. |
| 5 (SD) | Active-low shutdown control | Pull high via 10 kΩ resistor for normal operation; drive low to reduce quiescent current to 1.8 µA. |
| 6 (TEST) | Factory test mode enable | Must be tied to GND in all production applications; floating or high states may cause undefined behavior. |
| 7 (PWM) | Digital current-encoded output | Open-drain capable (1 mA sink), logic-level PWM with duty cycle linearly proportional to sensed current. |
| 8 (SENSE−) | Low-side current return | Connects to load side of sensing path; completes current loop through internal 0.003 Ω element. |
Key Features
| Feature | Design Value |
|---|---|
| No external sense resistor required | Eliminates board space, calibration drift, and thermal EMF errors associated with discrete shunts. |
| PWM output with direction encoding | Enables single-wire bidirectional current readout using standard microcontroller timers or low-complexity analog comparators. |
| Internal delta-sigma modulation + digital filtering | Provides inherent rejection of high-frequency noise and current spikes without external op-amps or complex analog filters. |
| Low temperature sensitivity | DC offset remains under 10 mA over −40°C to +85°C junction range, preserving accuracy in automotive and industrial environments. |
| Power-on-reset (POR) circuit | Ensures defined startup state and prevents false triggering during power ramp-up or brownout conditions. |
Applications
| Battery Charge/Discharge Gauge | Motion Control Diagnostics |
|---|---|
|
Use Scenario: Real-time monitoring of Li-ion battery pack current during charging and discharging cycles in portable medical devices. IC Role / Device Role / Timing Role: High-side current sensor providing bidirectional PWM-encoded current data to an MCU ADC input or timer capture peripheral. Use Value: Enables accurate coulomb counting with ±2% accuracy and 0.003 Ω insertion loss, minimizing self-heating and extending battery runtime. |
Use Scenario: Detecting motor stall, phase imbalance, or winding faults in BLDC driver modules for HVAC blowers. IC Role / Device Role / Timing Role: High-side current monitor feeding PWM output to diagnostic firmware that computes RMS current and detects abnormal dwell times. Use Value: Delivers 50 ms averaged current values immune to commutation spikes, improving fault detection reliability without added filtering hardware. |
| Power Supply Load Monitoring | Resettable Smart Fuse |
|
Use Scenario: Tracking dynamic load current on a 3.3 V FPGA I/O bank to detect overcurrent events before damage occurs. IC Role / Device Role / Timing Role: Precision current gauge interfaced to FPGA GPIO or microcontroller, generating interrupt on sustained overcurrent via software thresholding. Use Value: Provides ±2.0 A full-scale range with 1.8 µA shutdown current, enabling always-on monitoring with minimal standby power impact. |
Use Scenario: Replacing mechanical fuses in telecom power distribution units with electronic protection that auto-recovers after fault clearance. IC Role / Device Role / Timing Role: Core current-sensing element in a closed-loop protection circuit that disables MOSFET gate drive upon sustained >1.8 A detection. Use Value: Achieves fast response (<100 ms) with no calibration drift, leveraging internal 0.003 Ω sense and 50 ms averaging to distinguish faults from inrush. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA219AIDR | I²C output, 16-bit ADC, ±32 V common-mode, no internal sense element - requires external shunt. | Supports higher bus voltages and digital communication but adds layout complexity and calibration burden. | Choose when system already uses I²C infrastructure and needs wider common-mode range (>5.5 V). |
| MAX40056ATA+T | Zero-drift amplifier + comparator output, 2.7 V to 5.5 V supply, ±50 mV input range - requires external shunt and external PWM generation logic. | Offers faster response (<1 µs) but lacks integrated averaging and direction encoding. | Choose when nanosecond-level overcurrent reaction is critical and microcontroller resources exist for PWM synthesis. |
Compared with LM3822MM-2.0/NOPB, INA219AIDR trades integrated sensing and PWM simplicity for digital flexibility and voltage range, while MAX40056ATA+T sacrifices ease of use and built-in averaging for raw speed - making LM3822MM-2.0/NOPB optimal for cost-sensitive, space-constrained 2.0 A bidirectional monitoring where 50 ms latency is acceptable.
Availability
LM3822MM-2.0/NOPB is available at Aetrix Electronics and suitable for battery management systems, motion control diagnostics, and resettable smart fuse implementations requiring stable component supply and long-term industrial availability.
Supply support for LM3822MM-2.0/NOPB 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 LM3822MM-2.0/NOPB belongs to TI's precision current-sense gauge product line, designed specifically for high-side, bidirectional, shunt-free current measurement in battery-powered and industrial control systems.
FAQ
What is the full-scale current range of the LM3822MM-2.0/NOPB?
The LM3822MM-2.0/NOPB is factory-set for a ±2.0 A full-scale range, meaning it accurately measures bidirectional currents from –2.0 A to +2.0 A. This is distinct from the LM3822MM-1.0/NOPB variant, which is calibrated for ±1.0 A. The part number suffix "-2.0" explicitly denotes this range, and the internal delta-sigma modulator and PWM scaling are configured accordingly in the LM3822MM-2.0/NOPB.
Does the LM3822MM-2.0/NOPB require an external current sense resistor?
No, the LM3822MM-2.0/NOPB integrates a precision 0.003 Ω sense element within its die, eliminating the need for any external shunt resistor. This internal element is laser-trimmed and thermally compensated, contributing directly to the ±2% total accuracy specification at room temperature - a key differentiator from amplifier-based solutions like the MAX40056ATA+T that require external resistors.
How does the PWM output of the LM3822MM-2.0/NOPB encode current magnitude and direction?
The LM3822MM-2.0/NOPB outputs a 20 Hz PWM signal where 50% duty cycle represents zero current. Duty cycles above 50% (up to 95.5%) indicate positive current flow proportional to +2.0 A, and duty cycles below 50% (down to 4.5%) indicate negative flow proportional to –2.0 A. The relationship is defined by ISENSE = 2.2 × (D − 0.5) × 2.0 A, where D is the measured duty cycle - a direct, linear mapping implemented in the LM3822MM-2.0/NOPB's digital core.
What is the purpose of the FLTR+ and FLTR− pins on the LM3822MM-2.0/NOPB?
The FLTR+ and FLTR− pins on the LM3822MM-2.0/NOPB form a differential anti-aliasing filter input for the internal delta-sigma modulator. A 0.1 µF ceramic capacitor must be placed between them to set the filter cutoff frequency, preventing high-frequency noise from folding into the 20 Hz baseband and corrupting the current measurement - a critical design requirement specified in the LM3822MM-2.0/NOPB datasheet for achieving rated accuracy.
Can the LM3822MM-2.0/NOPB operate from a 3.3 V supply?
Yes, the LM3822MM-2.0/NOPB supports a supply range of 2.0 V to 5.25 V, making it fully compatible with standard 3.3 V logic rails. At 3.3 V, the PWM output maintains valid logic levels: VOH ≥ 3.25 V (min) and VOL ≤ 0.2 V (max) at 1 mA sink, ensuring robust interfacing with 3.3 V microcontrollers - a capability confirmed in the LM3822MM-2.0/NOPB's COMMON DEVICE PARAMETERS table.
LM3822MM-2.0/NOPB 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
LM3822MM-2.0/NOPB FAQ
1.How can I place an order for LM3822MM-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3822MM-2.0/NOPB 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 LM3822MM-2.0/NOPB reliable?
The price and inventory of LM3822MM-2.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3822MM-2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM3822MM-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3822MM-2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3822MM-2.0/NOPB?
LM3822MM-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3822MM-2.0/NOPB 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 LM3822MM-2.0/NOPB?
For technical support, including LM3822MM-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3822MM-2.0/NOPB requirements.
6.How does Aetrix verify that LM3822MM-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3822MM-2.0/NOPB 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 LM3822MM-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM3822MM-2.0/NOPB?
All LM3822MM-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3822MM-2.0/NOPB, 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 LM3822MM-2.0/NOPB part is unused and in its original packaging.
Return procedure for LM3822MM-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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