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Texas Instruments LM3822MM-1.0/NOPB
- Part No.:
- LM3822MM-1.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3822MM-1.0/NOPB.pdf
- Description:
- IC CURRENT GAUGE 2% 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,739
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Product details
Overview
LM3822MM-1.0/NOPB from Texas Instruments is a precision high-side current gauge IC with an integrated 0.003Ω sense element, ±1.0A measurement range, PWM output encoding magnitude and direction, 50ms sampling interval, and MSOP-8 package - used in battery charge/discharge monitoring and smart fuse applications.
For engineers reviewing the LM3822MM-1.0/NOPB datasheet, LM3822MM-1.0/NOPB pinout, LM3822MM-1.0/NOPB application, or LM3822MM-1.0/NOPB equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, and two confirmed alternative parts for current-sensing system design.
Technical Context
The LM3822MM-1.0/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 output. Its internal zero-ohm sense element eliminates external shunt placement and layout sensitivity.
Current averaging occurs over fixed 50ms intervals, rejecting sub-50ms transients; duty cycle is linearly related to sensed current via ISENSE = 2.2(D − 0.5) × 1.0A, with 50% representing zero current, >50% indicating positive flow, and <50% indicating reverse flow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Range | ±1.0 A full-scale - supports bidirectional battery charge/discharge monitoring without polarity switching. |
| Insertion Loss | 0.003 Ω typical - minimizes power loss and self-heating in high-current paths. |
| Accuracy | ±2% at room temperature - includes calibration of internal sense element, enabling direct replacement of external shunts. |
| Sampling Interval | 50 ms - provides inherent immunity to short-duration current spikes and simplifies host MCU timing. |
| PWM Frequency | 20 Hz nominal (12.5–25 Hz range) - compatible with low-cost microcontroller input capture or duty-cycle measurement. |
| Supply Range | 2.0 V to 5.25 V - interoperable with 3.3 V and 5 V logic domains without level shifting. |
| Shutdown Current | 1.8 µA typical - enables ultra-low-power operation during system sleep modes. |
Pinout & Package
LM3822MM-1.0/NOPB is housed in an MSOP-8 package with exposed thermal pad (pin 8 is SENSE−, not thermal pad). The device uses high-side sensing topology and requires no external sense resistor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SENSE+, VDD) | High-side current input and supply rail | Connects directly to battery/PSU positive; supplies internal circuitry - no separate VDD bypass required if local 1 µF cap is placed. |
| 2 (GND) | Power ground reference | Common return for internal analog/digital blocks; must be tied to system ground near sense path to avoid offset errors. |
| 3 (FLTR+) | Positive anti-aliasing filter input | Accepts filtered differential voltage from internal sense element; requires 0.1 µF ceramic cap to FLTR− for noise rejection. |
| 4 (FLTR−) | Negative anti-aliasing filter input | Completes differential filter pair with FLTR+; forms RC network that sets effective bandwidth and prevents aliasing. |
| 5 (SD) | Active-low shutdown control | Pull-up to VDD for normal operation; driven low to reduce quiescent current to 1.8 µA - useful during standby or startup sequencing. |
| 6 (TEST) | Factory test mode enable | Must be tied to GND in all production designs; floating or high state may cause undefined behavior or calibration drift. |
| 7 (PWM) | Digital current magnitude/direction output | Open-drain compatible; outputs duty cycle proportional to ISENSE (50% = 0 A); requires external pull-up for logic-level compatibility. |
| 8 (SENSE−) | Low-side current return | Connects to load side of high-side sense point; completes current path through internal sense element - not ground. |
Key Features
| Feature | Design Value |
|---|---|
| No external sense resistor | Eliminates PCB area, layout sensitivity, and thermal drift errors associated with discrete shunts - reduces BOM count and calibration effort. |
| PWM output encoding | Enables robust current readout using standard MCU timer peripherals - avoids ADC linearity, reference, and sampling-rate constraints. |
| Internal delta-sigma modulation | Converts analog current to digital domain before filtering - achieves high noise immunity and stable accuracy across temperature without analog integrators. |
| 50ms current averaging | Provides built-in low-pass response equivalent to ~10 Hz cutoff - suppresses switching noise and transient spikes without external components. |
| Low temperature sensitivity | DC offset remains under 1 mA over −40°C to +85°C - ensures reliable low-current detection (e.g., battery trickle charge) across industrial environments. |
Applications
| Battery Charge/Discharge Gauge | Motion Control Diagnostics |
|---|---|
Use Scenario: Monitoring bidirectional current in portable medical devices or UPS systems during charging and load discharge cycles. IC Role / Device Role / Timing Role: High-side current sensor providing real-time, direction-aware feedback to battery management firmware. Use Value: Enables accurate state-of-charge estimation and overcurrent protection without adding insertion loss or requiring dual-shunt configurations. | Use Scenario: Detecting stall conditions and phase imbalance in stepper or BLDC motor drivers. IC Role / Device Role / Timing Role: Real-time current monitor on H-bridge high-side rails feeding motor windings. Use Value: Delivers fast fault detection (<50ms response) and eliminates need for isolated current sensors in cost-sensitive motion platforms. |
| Power Supply Load Monitoring | Resettable Smart Fuse |
Use Scenario: Tracking dynamic load current in telecom DC-DC modules to trigger thermal derating or fan control. IC Role / Device Role / Timing Role: Precision current transducer interfacing to system supervisor MCU via PWM input. Use Value: Provides stable, drift-free measurement across 2V–5.25V supply range - compatible with both 3.3V and 5V supervisory controllers. | Use Scenario: Replacing mechanical fuses in industrial PLC I/O modules with electronic overcurrent protection. IC Role / Device Role / Timing Role: Fault-sensing element triggering automatic shutdown and auto-retry via SD pin control. Use Value: Supports programmable trip thresholds and recovery timing via host firmware - eliminates fuse replacement downtime. |
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, ±3.2A range, 0.1% gain error, no internal sense element - requires external 0.1Ω shunt. | Requires board space for shunt and I²C routing; better suited for multi-channel, high-resolution logging than single-point PWM-based control. | Select when digital bus interface, higher resolution, or multi-range flexibility outweighs simplicity and zero-insertion-loss benefits of LM3822MM-1.0/NOPB. |
| MAX4080TASA+ | High-side current sense amplifier with analog voltage output, 0–5V output swing, ±5A range, 0.5% max gain error, no internal sense. | Needs external shunt and ADC; offers faster response (<1µs) but lacks built-in averaging - more sensitive to noise without additional filtering. | Select when analog output is preferred for existing signal chains or when sub-millisecond response is critical - not for low-power, low-component-count implementations. |
Compared with INA219AIDR and MAX4080TASA+, the LM3822MM-1.0/NOPB uniquely integrates the sense element and delivers direct PWM output - reducing component count, eliminating shunt-related thermal drift, and simplifying firmware integration at the cost of fixed 1A range and 50ms update latency.
Availability
LM3822MM-1.0/NOPB is available at Aetrix Electronics and suitable for battery charge/discharge gauge, motion control diagnostics, and resettable smart fuse applications requiring stable component supply and long-term industrial availability.
Supply support for LM3822MM-1.0/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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The LM3822 product line was designed specifically for high-accuracy, low-loss current sensing in space-constrained battery-powered and safety-critical systems - prioritizing integration, reliability, and ease of firmware integration over configurability.
FAQ
What is the full-scale current range of the LM3822MM-1.0/NOPB?
The LM3822MM-1.0/NOPB is factory-set for a ±1.0 A full-scale current range. It measures bidirectional current from −1.0 A to +1.0 A using its internal 0.003 Ω sense element. This range is fixed and cannot be adjusted externally - unlike the LM3822-2.0 variant which supports ±2.0 A.
How does the PWM output of the LM3822MM-1.0/NOPB encode current magnitude and direction?
The LM3822MM-1.0/NOPB PWM output uses duty cycle to represent current: 50% duty cycle equals zero current; values above 50% indicate positive current flow proportional to (D − 0.5) × 2.2 × 1.0 A; values below 50% indicate negative current. For example, 60% duty cycle corresponds to +0.22 A, and 40% corresponds to −0.22 A.
Does the LM3822MM-1.0/NOPB require an external current sense resistor?
No, the LM3822MM-1.0/NOPB does not require an external current sense resistor. It integrates a precision 0.003 Ω internal sense element optimized for high-side sensing. This eliminates PCB layout sensitivity, thermal drift, and power loss associated with discrete shunts - a core design feature of the LM3822MM-1.0/NOPB.
What is the sampling interval and update rate of the LM3822MM-1.0/NOPB?
The LM3822MM-1.0/NOPB performs current sampling every 50 ms, resulting in a nominal update rate of 20 Hz. Each PWM duty cycle reflects the average current over the prior 50 ms interval. This fixed interval provides inherent rejection of transients shorter than 50 ms and simplifies host MCU timing requirements for the LM3822MM-1.0/NOPB.
Can the LM3822MM-1.0/NOPB operate from a 3.3 V supply?
Yes, the LM3822MM-1.0/NOPB operates from 2.0 V to 5.25 V, fully supporting standard 3.3 V logic supplies. Its PWM output is open-drain and compatible with 3.3 V microcontrollers when pulled up to the same rail. Quiescent current remains at 95 µA in active mode and drops to 1.8 µA in shutdown - making it suitable for battery-powered LM3822MM-1.0/NOPB deployments.
LM3822MM-1.0/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-1.0/NOPB FAQ
1.How can I place an order for LM3822MM-1.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3822MM-1.0/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-1.0/NOPB reliable?
The price and inventory of LM3822MM-1.0/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-1.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM3822MM-1.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3822MM-1.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3822MM-1.0/NOPB?
LM3822MM-1.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3822MM-1.0/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-1.0/NOPB?
For technical support, including LM3822MM-1.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3822MM-1.0/NOPB requirements.
6.How does Aetrix verify that LM3822MM-1.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3822MM-1.0/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-1.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM3822MM-1.0/NOPB?
All LM3822MM-1.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3822MM-1.0/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-1.0/NOPB part is unused and in its original packaging.
Return procedure for LM3822MM-1.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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