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Analog Devices Inc./Maxim Integrated MAX4070ATA+T
- Part No.:
- MAX4070ATA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WQFN Exposed Pad
- Datasheet:
-
MAX4070ATA+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,059
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Product details
Overview
MAX4070ATA+T from Maxim Integrated is a bidirectional, high-side current-sense amplifier with integrated 2.5V precision reference, designed for battery charge/discharge monitoring in portable electronics. It operates from 3.6V to 24V supply, supports selectable 50V/V or 100V/V gain via GSEL pin, delivers <1.5% total output error over –40°C to +125°C, and features 1.35V–24V input common-mode range independent of supply voltage - enabling accurate sensing even during deep battery discharge.
For engineers reviewing the MAX4070ATA+T datasheet, MAX4070ATA+T pinout, MAX4070ATA+T application, or MAX4070ATA+T equivalent, this page provides verified technical context, validated pin functions, real-world use cases in fuel gauging and smart-battery systems, and confirmed alternative options for design flexibility and supply continuity.
Technical Context
The MAX4070ATA+T implements a BiCMOS-based high-side current-sensing architecture with dual-input transistor pairs (Q1/Q2) and matched gain resistors (RG1 = RG2 = 104kΩ typ), enabling precise bidirectional VSENSE measurement without polarity switching. Its internal 2.5V reference (±20mV over temperature) sets the output midpoint, with OUT swinging from 2.5V to VCC for charging current and from 2.5V to GND for discharging current.
Gain selection is controlled by the GSEL pin (logic low = 50V/V, logic high = 100V/V), and shutdown mode (SHDN = GND) reduces supply current to 10µA while placing OUT in high-impedance state. The device maintains stability with capacitive loads up to 100pF and achieves 100kHz (gain=50) or 40kHz (gain=100) small-signal bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.6V to 24V - ensures operation across wide battery voltage ranges including multi-cell Li-ion packs. |
| Input Common-Mode Range | 1.35V to 24V, independent of VCC - enables accurate sensing down to near-dead battery voltages without rail dependency. |
| Total Output Error | ±1.5% max over –40°C to +125°C - guarantees reliable current measurement accuracy across automotive-grade temperature extremes. |
| Reference Voltage | 2.50V ±20mV (TA = –40°C to +125°C) - provides stable, known midpoint for bidirectional output swing and ADC interfacing. |
| Supply Current | 100µA typ (active), 10µA typ (shutdown) - minimizes quiescent power draw in battery-powered systems with sleep modes. |
| Gain Options | 50V/V or 100V/V via GSEL pin - allows optimization of sense resistor value and dynamic range for specific full-scale current targets. |
| Bandwidth | 100kHz at 50V/V, 40kHz at 100V/V - supports fast transient current detection in motor control and charger regulation loops. |
Pinout & Package
MAX4070ATA+T is packaged in an 8-pin thin QFN with exposed pad (EP), optimized for thermal performance and space-constrained portable designs. The exposed paddle must be connected to GND for rated power dissipation (1951mW at TA = +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Shutdown control input | Logic-low assertion disables amplifier and reduces ICC to 10µA; high-impedance OUT state prevents loading downstream circuitry. |
| 2 RS− | Negative sense resistor terminal | Kelvin connection point for low-impedance return path; microamp-level bias current minimizes trace-resistance error. |
| 3 RS+ | Positive sense resistor terminal | Kelvin connection point for high-side current path; supports common-mode voltages up to 24V regardless of VCC. |
| 4 N.C. | No connection | Internally unconnected; must remain floating or tied to GND per layout best practice - no functional role. |
| 5 GND | Analog ground reference | Primary ground return for internal circuitry and exposed paddle; requires low-impedance star grounding for optimal accuracy. |
| 6 REFOUT | 2.5V reference output | Stable 2.5V source (±20mV, –40°C to +125°C) used as output midpoint; can source 500µA or sink 100µA. |
| 7 OUT | Current-sense output | Voltage output referenced to REFOUT: VOUT = VREFOUT + (VRS+ − VRS−) × Gain - directly interfaces with SAR or delta-sigma ADCs. |
| 8 GSEL | Gain select input | Logic level selects gain: GND = 50V/V, VCC = 100V/V - enables single-part flexibility across multiple current ranges. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Measures charge and discharge currents through one external resistor without polarity switching or external op-amps. |
| Internal 2.5V precision reference | Eliminates need for external reference IC or resistor divider; ±20mV tolerance over full temperature range ensures consistent output centering. |
| Selectable gain (50/100 V/V) | Enables optimization of sense resistor value and full-scale voltage for target current range - e.g., 75mV at 50V/V yields 3.75V output swing. |
| 1.35V–24V common-mode independence | Accurate sensing remains valid even when battery voltage drops below VCC, critical for fuel gauging in deeply discharged states. |
| 10µA shutdown current | Extends battery life in standby modes; OUT goes high-Z to avoid loading ADC inputs or pull-up networks. |
Applications
| Notebook Fuel Gauging | Smart-Battery Packs/Chargers |
|---|---|
Use Scenario: Real-time battery capacity estimation in ultrabooks and 2-in-1 laptops using Coulomb counting. IC Role / Device Role / Timing Role: High-side current monitor providing bidirectional analog output to microcontroller ADC for integrated fuel-gauge algorithm. Use Value: Enables accurate state-of-charge tracking across full battery voltage range (e.g., 3.0V–4.4V per cell), even during deep discharge where VCC may fall below pack voltage. |
Use Scenario: Embedded battery management in replaceable smart battery modules compliant with SMBus or custom protocols. IC Role / Device Role / Timing Role: Primary current transducer feeding safety MCU with charge/discharge data for overcurrent protection and cycle-life modeling. Use Value: Internal 2.5V reference and ±1.5% error guarantee enable direct ADC interface without calibration drift, reducing BOM count and firmware complexity. |
| Motor Control Feedback | Power-Management Systems |
Use Scenario: Low-latency current feedback in brushed DC or BLDC motor drivers for torque regulation and stall detection. IC Role / Device Role / Timing Role: High-bandwidth (100kHz @ 50V/V) current sensor placed on high-side of H-bridge power stage. Use Value: Fast transient response (<100µs settling) and rail-to-rail output swing relative to REFOUT allow robust closed-loop control under dynamic load conditions. |
Use Scenario: System-level power budgeting and thermal-aware load shedding in industrial handhelds and medical portables. IC Role / Device Role / Timing Role: Centralized current monitor for main battery rail feeding multiple subsystems (display, RF, sensors). Use Value: 100µA quiescent current and shutdown mode support ultra-low-power system sleep states while retaining rapid wake-up capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4070AUA+ | Same electrical specs and reference voltage, but in 8-pin µMAX package (larger footprint, lower thermal dissipation: 362mW vs. 1951mW). | Preferred for prototyping or low-volume designs where QFN rework is challenging; less suitable for high-power density or thermally constrained layouts. | Select MAX4070AUA+ when board assembly uses µMAX-compatible pick-and-place or when thermal margin exceeds 362mW requirement. |
| INA219BIDR | Integrated 12-bit ADC, I²C interface, and programmable gain (1×–128×); no internal reference - relies on external VREF or internal 0.1V shunt reference. | Targets digital-output systems requiring minimal MCU ADC resources; lacks true high-side common-mode independence (max 26V common-mode, dependent on VCC). | Select INA219BIDR when digital bus interface and on-chip conversion are prioritized over analog simplicity and absolute common-mode independence. |
Compared with MAX4070AUA+, the MAX4070ATA+T offers superior thermal performance and smaller footprint; compared with INA219BIDR, it provides guaranteed common-mode independence and analog output compatibility with existing ADC architectures - making it optimal for high-accuracy, high-density, analog-centric battery monitoring.
Availability
MAX4070ATA+T is available at Aetrix Electronics and suitable for notebook fuel gauging, smart-battery pack monitoring, and industrial portable power-management systems requiring stable component supply, automotive-grade temperature operation, and long-term lifecycle availability.
Supply support for MAX4070ATA+T 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for industrial, automotive, and portable applications.
The MAX4069–MAX4072 family was designed specifically for high-accuracy, low-power, bidirectional battery current monitoring in space- and energy-constrained portable electronics - emphasizing common-mode independence, integrated references, and wide supply flexibility.
FAQ
What is the operating supply voltage range for the MAX4070ATA+T?
The MAX4070ATA+T operates from 3.6V to 24V single supply. This higher minimum voltage (vs. 2.7V for MAX4071/MAX4072) is required to support its internal 2.5V reference circuitry. Operation below 3.6V is not guaranteed and may result in reference instability or increased output error.
How does the MAX4070ATA+T handle bidirectional current sensing without separate polarity outputs?
The MAX4070ATA+T uses its internal 2.5V reference as the output midpoint: charging current produces an output voltage from 2.5V to VCC, while discharging current produces an output from 2.5V to GND. This single-ended, rail-referenced architecture eliminates need for dual outputs or external level-shifting circuitry.
Can the MAX4070ATA+T be used with a 12V lead-acid battery system?
Yes - the MAX4070ATA+T supports input common-mode voltages from 1.35V to 24V, fully covering the 10.5V–14.8V operating range of 12V lead-acid batteries. Its supply voltage (3.6V–24V) also accommodates direct connection to the battery rail or regulated 5V/12V supplies.
What is the maximum recommended capacitive load on the REFOUT pin of the MAX4070ATA+T?
The REFOUT pin of the MAX4070ATA+T is stable with up to 500pF total capacitance. Exceeding this value may cause oscillation or reference voltage droop under load. For decoupling, use a 0.1µF ceramic capacitor between REFOUT and GND, placed close to the device.
Does the MAX4070ATA+T require Kelvin connections for the sense resistor?
Yes - Kelvin (4-wire) connections to RS+ and RS− are strongly recommended. Although input bias current is low (≤5µA), trace resistance between the sense resistor and IC pins introduces offset errors. Separating force and sense paths ensures measurement accuracy, especially at low current levels.
MAX4070ATA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 100 kHz
- Current - Input Bias:
- 2.4 µA
- Voltage - Input Offset:
- 80 µV
- Current - Supply:
- 100µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 3.6 V
- Voltage - Supply Span (Max):
- 24 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TQFN (3x3)
MAX4070ATA+T FAQ
1.How can I place an order for MAX4070ATA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4070ATA+T 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 MAX4070ATA+T reliable?
The price and inventory of MAX4070ATA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4070ATA+T is usually 5 days.
3.What payment methods are accepted for MAX4070ATA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4070ATA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4070ATA+T?
MAX4070ATA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4070ATA+T 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 MAX4070ATA+T?
For technical support, including MAX4070ATA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4070ATA+T requirements.
6.How does Aetrix verify that MAX4070ATA+T is sourced from the original manufacturer or authorized distributors?
All MAX4070ATA+T 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 MAX4070ATA+T meets industry standards.
7.What is the process for return or replacement of MAX4070ATA+T?
All MAX4070ATA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4070ATA+T, 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 MAX4070ATA+T part is unused and in its original packaging.
Return procedure for MAX4070ATA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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