My Inquiry
My Account
Texas Instruments LM3824MM-1.0/NOPB
- Part No.:
- LM3824MM-1.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3824MM-1.0/NOPB.pdf
- Description:
- IC CURRENT GAUGE 3% 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,510
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3824MM-1.0/NOPB from Texas Instruments (formerly National Semiconductor) is a precision high-side current gauge IC with integrated zero-ohm sense element, ±1.0A measurement range, 50 ms sampling interval, and PWM output encoding current magnitude and direction. It delivers ±2% room-temperature accuracy, 0.003Ω typical insertion loss, and operates from 2.0V to 5.5V supply - used in battery charge/discharge monitoring and smart fuse applications.
For engineers reviewing the LM3824MM-1.0/NOPB datasheet, LM3824MM-1.0/NOPB pinout, LM3824MM-1.0/NOPB application, or LM3824MM-1.0/NOPB equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative parts for current-sensing system design and BOM optimization.
Technical Context
The LM3824MM-1.0/NOPB implements a delta-sigma analog-to-digital converter with internal digital filtering to average sensed current over fixed 50 ms intervals, rejecting sub-50 ms transients. Its PWM output encodes bidirectional current via duty cycle: 50% = zero current, >50% = positive flow, <50% = negative flow, with resolution of 0.1% duty cycle steps.
It features internal power-on-reset (POR), shutdown control (SD pin), low-temperature-drift sensing (2600 ppm/°C internal resistor), and built-in anti-aliasing filter inputs (FLTR+, FLTR−). The device requires no external sense resistor and maintains DC offset under 1 mA for the ±1.0A variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Range | ±1.0 A continuous - supports bidirectional battery charge/discharge monitoring without polarity reversal circuitry. |
| Sampling Interval | 50 ms fixed - provides immunity to short-duration current spikes while enabling stable averaging for microcontroller-based readout. |
| Accuracy | ±2% at 25°C - includes full-system error (internal sense element + ADC), enabling direct current estimation without calibration. |
| Insertion Loss | 0.003 Ω typical - minimizes power loss and self-heating in high-current paths, critical for efficiency-sensitive power rails. |
| Supply Voltage | 2.0 V to 5.5 V - compatible with single-cell Li-ion, 3.3 V logic, and 5 V industrial rails without level-shifting. |
| Shutdown Current | 1.8 µA typical - enables ultra-low-power sleep mode during system standby or initialization. |
| PWM Frequency | 20 Hz nominal (12.5–25 Hz range) - ensures easy digital capture by low-cost MCUs with minimal timing overhead. |
Pinout & Package
LM3824MM-1.0/NOPB is housed in an MSOP-8 package (NS MUA08A), thermally enhanced for surface-mount assembly and optimized for high-side current sensing in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SENSE+, VDD | High-side sense node and power supply input | Connects directly to high-side power rail; supplies internal circuitry and carries full load current through integrated sense element. |
| 2: GND | Power ground reference | Return path for supply current and reference for internal ADC and PWM logic; must be low-impedance connection. |
| 3: FLTR+ | Positive anti-aliasing filter input | Accepts external RC filter (with Pin 4) to suppress noise before delta-sigma modulation, preventing aliasing errors. |
| 4: FLTR− | Negative anti-aliasing filter input | Differential filter pair with Pin 3; forms first-order low-pass network matching modulator bandwidth requirements. |
| 5: SD | Active-low shutdown control | Pulling low disables internal circuitry and reduces quiescent current to 1.8 µA; requires pull-up for normal operation. |
| 6: TEST | Factory test pin | Must be tied to GND in production systems; floating or high states may cause undefined behavior or disable operation. |
| 7: PWM | Digital current-encoded output | Open-drain compatible output; duty cycle linearly maps to sensed current (e.g., 60% = +0.22 A), easily read by MCU timers. |
| 8: SENSE− | Low-side sense node | Completes internal sense path; connects to load side of monitored branch and serves as current return path. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated zero-ohm sense element | Eliminates external shunt resistor, saving board space and removing tolerance/TC errors associated with discrete components. |
| PWM output with direction encoding | Single-wire digital interface conveys both magnitude and polarity - avoids dual ADC channels or sign-bit logic in host firmware. |
| 50 ms current averaging | Hardware-level filtering rejects transient surges (e.g., motor startup spikes), delivering stable readings without software post-processing. |
| Internal delta-sigma ADC | Converts analog current to digital domain on-chip, enabling precise digital filtering and eliminating analog signal integrity challenges. |
| DC offset <1 mA | Enables accurate measurement down to ~10 mA (±5% typical), supporting low-power state monitoring and trickle-charge detection. |
Applications
| Battery Charge/Discharge Monitoring | Motion Control Diagnostics |
|---|---|
|
Use Scenario: Real-time tracking of Li-ion battery pack current during charging cycles and regenerative braking in portable tools. IC Role / Device Role / Timing Role: High-side current gauge providing bidirectional PWM-encoded current feedback to battery management MCU. Use Value: Enables Coulomb counting with ±2% accuracy and 1 mA offset, improving state-of-charge estimation without external shunt calibration. |
Use Scenario: Detecting abnormal current draw in stepper motor drivers during stall or phase fault conditions. IC Role / Device Role / Timing Role: High-side current sensor feeding PWM duty cycle to motion controller for real-time load diagnostics. Use Value: 50 ms averaging suppresses commutation noise while preserving fault detection speed; no external filtering required. |
| Power Supply Load Management | Resettable Smart Fuse |
|
Use Scenario: Monitoring output current of 3.3 V/5 V DC-DC converters in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Precision current monitor interfacing directly with system supervisor MCU via PWM input capture. Use Value: 0.003 Ω insertion loss prevents voltage droop and thermal drift in tightly regulated rails, maintaining output stability. |
Use Scenario: Replacing mechanical fuses in USB-C PD power delivery circuits with programmable overcurrent protection. IC Role / Device Role / Timing Role: Current-sense front-end triggering MCU-based shutdown when PWM duty exceeds threshold for >50 ms. Use Value: Hardware-averaged current detection prevents nuisance tripping from inrush; shutdown pin enables fast latch-off response. |
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, 26 V max common-mode, 0.1% gain error, no internal sense element - requires external shunt. | Supports higher voltage rails (>5.5 V) and offers faster update rates (up to 1 kHz), but adds shunt placement and layout complexity. | Select when system requires digital bus interface, higher common-mode voltage, or multi-channel synchronized reads. |
| TSC2010IYDT | Current-output amplifier (4–20 mA loop compatible), 2.7–5.5 V supply, ±1.5% accuracy, no PWM or internal sense. | Designed for industrial analog transmission; lacks digital averaging, direction encoding, and zero-ohm integration. | Select when interfacing with legacy 4–20 mA receivers or where galvanic isolation is implemented downstream. |
Compared with LM3824MM-1.0/NOPB, INA219AIDR trades integrated sensing and simplicity for flexibility and speed, while TSC2010IYDT replaces PWM digital output with analog current-loop compatibility - neither offers the same combination of zero-ohm integration, bidirectional PWM encoding, and hardware-averaged 50 ms sampling.
Availability
LM3824MM-1.0/NOPB is available at Aetrix Electronics and suitable for battery management systems, industrial motor controllers, and USB-C power delivery designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM3824MM-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 acquired National Semiconductor in 2011 and maintains its precision analog portfolio, including current-sense ICs designed for high accuracy, low power, and system-level integration.
The LM3824MM-1.0/NOPB belongs to TI's high-side current gauge family, engineered specifically for embedded power monitoring where shunt-free operation, PWM simplicity, and robust transient rejection are prioritized over high-speed sampling.
FAQ
What is the sensing method used by the LM3824MM-1.0/NOPB?
The LM3824MM-1.0/NOPB uses high-side sensing with an integrated zero-ohm lead-frame sense element. It measures current by detecting the voltage drop across this internal resistor using a delta-sigma ADC, eliminating the need for external shunts. This architecture ensures minimal insertion loss (0.003 Ω) and direct compatibility with positive-rail monitoring in battery and power supply applications - all within the LM3824MM-1.0/NOPB's MSOP-8 footprint.
Does the LM3824MM-1.0/NOPB support bidirectional current measurement?
Yes, the LM3824MM-1.0/NOPB supports true bidirectional current measurement. Its PWM output encodes direction: duty cycle >50% indicates positive current flow (e.g., battery charging), <50% indicates negative flow (e.g., discharging), and exactly 50% represents zero current. This behavior is factory-trimmed for the ±1.0A range and is specified across the full −40°C to +85°C operating temperature range - a core functional attribute of the LM3824MM-1.0/NOPB.
What is the purpose of the FLTR+ and FLTR− pins on the LM3824MM-1.0/NOPB?
The FLTR+ and FLTR− pins on the LM3824MM-1.0/NOPB form a differential anti-aliasing filter input for the internal delta-sigma modulator. An external RC network (typically 0.1 µF capacitor between these pins) attenuates high-frequency noise before digitization, preventing aliasing errors that would corrupt current measurements. This hardware filter is mandatory per the LM3824MM-1.0/NOPB datasheet and directly enables the device's specified ±2% accuracy and 50 ms averaging performance.
Can the LM3824MM-1.0/NOPB operate from a 3.3 V supply?
Yes, the LM3824MM-1.0/NOPB operates reliably from a 3.3 V supply, which falls within its specified 2.0 V to 5.5 V supply range. At 3.3 V, it maintains full functionality: PWM output logic levels meet VOH ≥ 3.25 V and VOL ≤ 0.2 V (with 1 mA load), quiescent current remains at 95 µA, and accuracy holds at ±2% for the ±1.0A range. This makes the LM3824MM-1.0/NOPB ideal for modern 3.3 V microcontroller-based monitoring systems without level translation.
How does the shutdown (SD) pin function on the LM3824MM-1.0/NOPB?
The SD pin on the LM3824MM-1.0/NOPB is an active-low enable input. When pulled low, it places the LM3824MM-1.0/NOPB into shutdown mode, reducing quiescent current to 1.8 µA - critical for battery-powered standby operation. During startup, holding SD low prevents false PWM output until system stabilization. For normal operation, SD must be pulled high (e.g., via 10 kΩ resistor to VDD), as specified in the LM3824MM-1.0/NOPB application circuits and absolute maximum ratings.
LM3824MM-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:
- ±3%
- Voltage - Input:
- 2V ~ 5.5V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LM3824MM-1.0/NOPB FAQ
1.How can I place an order for LM3824MM-1.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3824MM-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 LM3824MM-1.0/NOPB reliable?
The price and inventory of LM3824MM-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 LM3824MM-1.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM3824MM-1.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3824MM-1.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3824MM-1.0/NOPB?
LM3824MM-1.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3824MM-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 LM3824MM-1.0/NOPB?
For technical support, including LM3824MM-1.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3824MM-1.0/NOPB requirements.
6.How does Aetrix verify that LM3824MM-1.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3824MM-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 LM3824MM-1.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM3824MM-1.0/NOPB?
All LM3824MM-1.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3824MM-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 LM3824MM-1.0/NOPB part is unused and in its original packaging.
Return procedure for LM3824MM-1.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3824MM-1.0/NOPB Tags
.jpg)
-
PSSI2021SAY,115
Nexperia USA Inc.
-
BCR401RE6327HTSA1
Infineon Technologies
-
INA199B2DCKR
Texas Instruments
-
INA199A1DCKR
Texas Instruments
-
INA199B1DCKR
Texas Instruments
-
NSI45015WT1G
onsemi
-
NSI45020T1G
onsemi
-
NSI45030AT1G
onsemi
-
NSI45025AT1G
onsemi
-
NSI45020AT1G
onsemi
-
NSI50010YT1G
onsemi
-
LM334Z/NOPB
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
