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Texas Instruments LM3812M-7.0/NOPB
- Part No.:
- LM3812M-7.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3812M-7.0/NOPB.pdf
- Description:
- IC CURRENT GAUGE 4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,442
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Product details
Overview
LM3812M-7.0/NOPB from Texas Instruments is a precision high-side current gauge IC featuring an integrated 0.004Ω sense element, ±7A continuous sensing range, PWM output encoding current magnitude and direction, and 50 ms sampling interval. It delivers ±2% accuracy at room temperature and operates from 2V to 5.25V supply, enabling battery charge/discharge monitoring in portable power systems.
For engineers reviewing the LM3812M-7.0/NOPB datasheet, LM3812M-7.0/NOPB pinout, LM3812M-7.0/NOPB application, or LM3812M-7.0/NOPB equivalent, key selection criteria include high-side sensing topology, PWM-based digital interface compatibility with microcontrollers, thermal layout sensitivity for 7A accuracy, and shutdown quiescent current of 2.5 µA.
Technical Context
The LM3812M-7.0/NOPB implements a delta-sigma analog-to-digital converter with internal anti-aliasing filtering (via FLTR+/FLTR− pins), digitally averaging sensed current over 50 ms intervals to reject transient spikes. Its PWM output has 1024-level resolution, with duty cycle linearly proportional to current: D = [ISENSE/(2.2 × 7A)] + 0.5.
It uses an on-chip lead-frame sense resistor with 2600 ppm/°C temperature coefficient, requiring careful PCB copper area under SENSE+ and SENSE− pins to minimize thermal gradient errors in 7A operation. Internal power-on-reset ensures reliable startup without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Range | ±7 A continuous (10 A peak for ≤200 ms); enables high-current battery and motor load monitoring |
| Insertion Loss | 0.004 Ω typical; minimizes voltage drop and power loss in high-side power path |
| Accuracy | ±2% at 25°C (includes internal sense element); supports precise state-of-charge estimation |
| Supply Range | 2.0 V to 5.25 V; compatible with Li-ion, USB, and logic-supply rails |
| PWM Frequency | 20 Hz nominal (12.5–25 Hz range); provides stable low-frequency digital output for MCU GPIO capture |
| Quiescent Current | 2.5 µA in shutdown mode; extends battery life during system sleep states |
| Sampling Interval | 52 ms typical (40–80 ms range); balances response time and noise immunity for load diagnostics |
Pinout & Package
LM3812M-7.0/NOPB is housed in an 8-pin SOIC (D0008A) package with exposed pad for thermal dissipation. Pin 1 serves dual function as SENSE+ input and VDD supply connection; pins 7 and 8 are ground terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SENSE+, VDD | High-side current sense input and primary supply rail; requires low-impedance connection to power path and stable bypass capacitor |
| 2 | SENSE− | Low-side current sense return; must be routed with matched trace geometry to Pin 1 to minimize thermal gradient error |
| 3 | FLTR+ | Positive input to internal anti-aliasing filter; connects to 0.1 µF ceramic capacitor to GND for delta-sigma stability |
| 4 | FLTR− | Negative input to internal anti-aliasing filter; forms differential filter pair with Pin 3 |
| 5 | SD | Active-low shutdown control; pulled high via 10 kΩ resistor for normal operation; reduces current to 2.5 µA when driven low |
| 6 | PWM | Open-drain PWM output; duty cycle encodes current magnitude/direction (50% = 0 A); sinks up to 1 mA |
| 7 | GND | Analog ground reference; connects to system ground plane with low-inductance path |
| 8 | GND | Second ground terminal; improves thermal conduction and reduces ground loop impedance |
Key Features
| Feature | Design Value |
|---|---|
| No external sense resistor required | Integrated 0.004Ω lead-frame element eliminates BOM cost, layout area, and matching tolerance errors |
| PWM output with direction encoding | Duty cycle >50% indicates positive current flow; <50% indicates reverse flow-enables bidirectional battery monitoring |
| Internal delta-sigma ADC with averaging | 50 ms current averaging rejects short-duration spikes (e.g., motor commutation noise) without external firmware filtering |
| Low-temperature sensitivity design | On-die thermal compensation and layout-aware calibration reduce drift in ambient temperature variations |
| Internal power-on-reset (POR) | Guarantees known initial state at power-up; prevents false triggering during supply ramp without external RC network |
Applications
| Battery Charge/Discharge Gauge | Motion Control Diagnostics |
|---|---|
|
Use Scenario: Monitoring bidirectional current in lithium-ion battery packs during charging and discharging cycles in portable medical devices. IC Role / Device Role / Timing Role: High-side current gauge providing PWM-encoded real-time current data to an embedded MCU for Coulomb counting and health estimation. Use Value: ±2% accuracy and 50 ms averaging enable precise state-of-charge tracking while rejecting charge termination transients. |
Use Scenario: Detecting overcurrent and stall conditions in brushed DC motor drivers used in industrial actuators. IC Role / Device Role / Timing Role: High-side current sensor feeding PWM output to safety controller for fast-response fault detection and shutdown. Use Value: 7A continuous rating and 10A short-term capability support motor surge currents without saturation or damage. |
| Power Supply Load Monitoring | Resettable Smart Fuse |
|
Use Scenario: Real-time load current supervision in 5V/3.3V point-of-load supplies for FPGA-based test equipment. IC Role / Device Role / Timing Role: Precision current monitor interfacing directly to microcontroller GPIO for adaptive power budgeting and thermal management. Use Value: 2.5 µA shutdown current allows persistent monitoring during standby; 2V–5.25V supply range matches system rail voltages. |
Use Scenario: Replacing mechanical fuses in telecom power distribution units with programmable overcurrent protection. IC Role / Device Role / Timing Role: High-side current measurement element in closed-loop protection circuit that triggers MOSFET gate control upon threshold violation. Use Value: Ultra-low insertion loss (0.004Ω) avoids derating supply capacity; PWM output enables configurable trip thresholds via firmware. |
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 |
|---|---|---|---|
| INA240A1QDRQ1 | Voltage-output (not PWM); higher bandwidth (400 kHz); ±20V common-mode range; requires external shunt | Better suited for fast transient detection and isolated systems; lacks built-in averaging and direction encoding | Select when needing analog output, higher speed, or wide common-mode operation-requires added signal conditioning |
| ACS724LLCTR-10AU-T | Galvanically isolated Hall-effect sensor; analog output; ±10A range; no internal filtering or averaging | Provides inherent isolation for high-voltage domains; less accurate (±1.5%) and more sensitive to magnetic interference | Choose for AC/DC systems requiring creepage/clearance; not suitable for precision bidirectional DC monitoring in compact layouts |
Compared with LM3812M-7.0/NOPB, INA240A1QDRQ1 offers superior speed and common-mode rejection but demands external components and firmware interpretation, while ACS724LLCTR-10AU-T provides isolation at the cost of accuracy, thermal drift, and lack of digital-ready PWM output.
Availability
LM3812M-7.0/NOPB is available at Aetrix Electronics and suitable for battery management systems, motor drive diagnostics, power supply telemetry, and resettable fuse implementations requiring stable component supply across production lifecycles.
Supply support for LM3812M-7.0/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 LM3812 product line was designed specifically for high-accuracy, low-loss current measurement in space-constrained battery-powered and industrial control systems-emphasizing integration, thermal robustness, and direct microcontroller interfacing.
FAQ
What is the full-scale current range of LM3812M-7.0/NOPB?
The LM3812M-7.0/NOPB is factory-set for ±7 A continuous current sensing (with 10 A peak capability for ≤200 ms). Its PWM output maps linearly across this range using the formula ISENSE = 2.2 × (D − 0.5) × 7 A, where D is measured duty cycle. This differs from the LM3812-1.0 variant, which is rated for ±1 A.
How does LM3812M-7.0/NOPB achieve zero insertion loss?
The LM3812M-7.0/NOPB integrates a precision 0.004 Ω lead-frame sense element-eliminating external shunts-and places it directly in the high-side power path. This ultra-low resistance minimizes voltage drop (<28 mV at 7 A) and power dissipation (<200 mW), preserving system efficiency without compromising measurement fidelity.
Can LM3812M-7.0/NOPB be used for bidirectional current measurement?
Yes, LM3812M-7.0/NOPB supports true bidirectional sensing: a 50% PWM duty cycle represents zero current, >50% indicates forward (positive) current flow, and <50% indicates reverse (negative) flow. This enables accurate charge/discharge tracking in battery systems without polarity-switching circuitry.
What layout considerations are critical for LM3812M-7.0/NOPB accuracy at 7A?
For ±7A accuracy, LM3812M-7.0/NOPB requires symmetric, wide copper traces under Pins 1 (SENSE+) and 2 (SENSE−) to equalize thermal gradients across the internal sense resistor. TI specifies that inadequate copper area causes temperature-induced gain error-verified in Figure 23 of the datasheet-so thermal coupling to the PCB must be optimized.
Does LM3812M-7.0/NOPB require external filtering components?
Yes, LM3812M-7.0/NOPB requires two external capacitors: a 0.1 µF ceramic capacitor between Pins 1 and 8 (VDD bypass), and a 0.1 µF ceramic capacitor between Pins 3 and 4 (FLTR+/FLTR−) to implement the anti-aliasing filter for its delta-sigma modulator. Omitting either degrades noise rejection and measurement stability.
LM3812M-7.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Current Gauge
- Sensing Method:
- High-Side
- Accuracy:
- ±4%
- Voltage - Input:
- 2V ~ 5.25V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM3812M-7.0/NOPB FAQ
1.How can I place an order for LM3812M-7.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3812M-7.0/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 LM3812M-7.0/NOPB reliable?
The price and inventory of LM3812M-7.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3812M-7.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM3812M-7.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3812M-7.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3812M-7.0/NOPB?
LM3812M-7.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3812M-7.0/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 LM3812M-7.0/NOPB?
For technical support, including LM3812M-7.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3812M-7.0/NOPB requirements.
6.How does Aetrix verify that LM3812M-7.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3812M-7.0/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 LM3812M-7.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM3812M-7.0/NOPB?
All LM3812M-7.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3812M-7.0/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 LM3812M-7.0/NOPB part is unused and in its original packaging.
Return procedure for LM3812M-7.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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