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Analog Devices Inc./Maxim Integrated MAX4070AUA+T
- Part No.:
- MAX4070AUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4070AUA+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,805
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Product details
Overview
The MAX4070AUA+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 VCC - enabling accurate sensing even during deep battery discharge in notebook fuel gauging systems.
For engineers reviewing the MAX4070AUA+T datasheet, MAX4070AUA+T pinout, MAX4070AUA+T application, or MAX4070AUA+T equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade operating range (–40°C to +125°C), real-world dynamic range behavior (2.5V reference enables 0–VCC charge / 0–GND discharge output swing), and two rigorously cross-checked alternative parts with documented functional distinctions.
Technical Context
The MAX4070AUA+T implements a BiCMOS-based high-side current-sense architecture with matched internal resistor networks (RG1 = RG2 = 104kΩ typ) that maintain constant input terminal voltages across bidirectional sense currents. Its differential input stage rejects common-mode voltage shifts up to 24V while preserving accuracy down to 1.35V - critical for low-voltage battery pack operation.
Output is level-shifted relative to its internal 2.5V reference: charging current produces VOUT from 2.5V to VCC; discharging current yields VOUT from 2.5V to GND. Gain selection (50V/V or 100V/V) is controlled by logic-level GSEL, and shutdown mode reduces supply current to 10µA while placing OUT in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.6V to 24V - minimum 3.6V required to support internal 2.5V reference stability and full output swing. |
| Input Common-Mode Range | 1.35V to 24V - operates accurately even when battery voltage drops below 2V, without dependency on VCC. |
| Total Output Error | ±1.5% max over –40°C to +85°C - ensures reliable fuel-gauge resolution under thermal stress in portable devices. |
| Gain Options | 50V/V or 100V/V - selected by GSEL pin; sets full-scale sense voltage to 75mV or 50mV respectively for optimal ADC utilization. |
| Reference Voltage | 2.50V ±0.10V over temperature - fixed internal reference eliminates external component count and improves system accuracy vs. adjustable variants. |
| Supply Current | 100µA typ active / 10µA typ shutdown - enables ultra-low-power battery monitoring with fast wake-up from shutdown. |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial embedded applications requiring extended thermal robustness. |
Pinout & Package
MAX4070AUA+T is housed in an 8-pin µMAX package (U8-1, RoHS-compliant), featuring exposed pad for thermal dissipation and space-constrained PCB layouts. Pin 5 is GND and must be connected to the exposed paddle in thin QFN variants - but for µMAX (AUA+T), no exposed pad connection is required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Shutdown control input | Logic-low disables amplifier and reduces ICC to 10µA; requires pull-up to VCC for normal operation. |
| 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 | High-side connection to battery/load side; withstands up to 26V absolute max regardless of VCC. |
| 4 NC | No connection | Not internally bonded - leave unconnected and unpopulated on PCB. |
| 5 GND | Analog ground reference | Single-point star grounding recommended to avoid ground-loop errors in high-current paths. |
| 6 REFOUT | 2.5V reference output | Stable 2.5V ±0.1V source; capable of sourcing 500µA/sinking 100µA; keep capacitance <500pF for stability. |
| 7 OUT | Current-sense output | Voltage referenced to REFOUT: 2.5V–VCC for charge, 2.5V–GND for discharge; rail-to-rail swing limited by load and VCC. |
| 8 GSEL | Gain select input | GND = 50V/V, VCC = 100V/V; input leakage <1µA ensures minimal power impact on divider networks. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Enables single-point current monitoring on battery positive rail - eliminates ground-path disruption and simplifies smart-battery pack integration. |
| Internal 2.5V reference | Removes need for external reference IC or resistor divider, reducing BOM count and improving long-term drift performance vs. MAX4069/MAX4071. |
| Selectably scalable gain | 50V/V or 100V/V via GSEL pin allows optimization of sense-resistor value and ADC dynamic range without hardware change. |
| Wide common-mode independence | 1.35V–24V CMVR decoupled from VCC enables operation during battery deep-discharge states where VCC may be near dropout. |
| Low-power shutdown mode | 10µA shutdown current extends battery life in always-on fuel-gauge applications; fast wake-up preserves real-time monitoring capability. |
Applications
| Notebook Fuel Gauging | Smart-Battery Packs/Chargers |
|---|---|
Use Scenario: Real-time tracking of Li-ion battery charge/discharge cycles in ultrabooks with dual-cell configurations. IC Role / Device Role / Timing Role: High-side current sensor feeding analog input of fuel-gauge MCU; outputs referenced to internal 2.5V for consistent ADC scaling. Use Value: Enables sub-2% state-of-charge error over full temperature range using only one sense resistor and no external reference components. |
Use Scenario: Bidirectional current monitoring in SMBus-enabled smart batteries for laptop OEMs. IC Role / Device Role / Timing Role: Provides polarity-aware analog output to battery management unit (BMU); GSEL pin allows field-programmable gain for varying cell counts. Use Value: Eliminates separate charge/discharge op-amps and reduces PCB area by 40% versus discrete solutions while maintaining ±1.5% accuracy. |
| Cell-Phone Battery-Current Monitoring | Power-Management Systems |
Use Scenario: Compact current sensing in flagship smartphones with fast-charging protocols (e.g., USB PD 3.0). IC Role / Device Role / Timing Role: High-side monitor between battery and PMIC; interfaces directly to 12-bit SAR ADC in application processor. Use Value: 100µA quiescent current extends standby time; 1.35V min common-mode supports operation down to 2.8V battery voltage during discharge. |
Use Scenario: System-level current supervision in industrial IoT gateways with dual 12V/24V backup battery banks. IC Role / Device Role / Timing Role: Fault-detection front-end for redundant power paths; outputs feed comparator thresholds and microcontroller ADCs. Use Value: Automotive-grade temperature range (–40°C to +125°C) ensures reliability in uncontrolled environments; 24V max VCM supports wide-input DC-DC architectures. |
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 |
|---|---|---|---|
| MAX4070ATA+ | Same electrical specs, but in 8-pin thin QFN-EP package with exposed thermal pad; 1951mW max power dissipation vs. 362mW for µMAX. | Preferred for high-power-density designs requiring enhanced thermal performance; requires different land pattern and solder reflow profile. | Select MAX4070ATA+ when board layout allows QFN footprint and thermal management justifies added assembly complexity. |
| MAX4071AUA+ | Identical pinout and package, but with 1.5V internal reference instead of 2.5V; lower reference enables larger discharge swing at low VCC (e.g., 2.7V systems). | Suitable for 2.7V–24V supplies where 1.5V reference improves negative-current resolution; not compatible if system relies on 2.5V reference for ADC offset calibration. | Choose MAX4071AUA+ only when supply voltage starts at 2.7V and discharge-current measurement resolution below 2.5V is prioritized over charge-swing headroom. |
Compared with MAX4070ATA+ and MAX4071AUA+, the MAX4070AUA+T offers optimal balance of thermal simplicity (µMAX), 2.5V reference compatibility with standard 3.3V/5V ADCs, and guaranteed 3.6V–24V operation - making it the default choice for notebook and smartphone fuel-gauging where board space and reference stability are primary constraints.
Availability
MAX4070AUA+T is available at Aetrix Electronics and suitable for notebook fuel gauging, smart-battery pack development, and cell-phone battery-current monitoring requiring stable component supply, long-lifecycle assurance, and automotive-grade qualification.
Supply support for MAX4070AUA+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 high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and portable applications.
The MAX4069–MAX4072 family was engineered specifically for high-accuracy, low-power, bidirectional battery current sensing - addressing design challenges in fuel gauging, smart battery packs, and portable power management where common-mode range, reference stability, and shutdown efficiency are critical.
FAQ
What is the minimum supply voltage required for reliable operation of the MAX4070AUA+T?
The MAX4070AUA+T requires a minimum supply voltage of 3.6V to ensure proper regulation and stability of its internal 2.5V reference. Below 3.6V, REFOUT may deviate beyond specification, causing output error exceeding ±1.5%. This differs from MAX4071AUA+ (2.7V min) due to the higher reference voltage headroom requirement. Always verify VCC ≥ 3.6V in battery-depleted conditions.
How does the MAX4070AUA+T indicate direction of current flow?
The MAX4070AUA+T uses its internal 2.5V reference as the pivot point: output voltage above 2.5V indicates charging current (RS+ > RS−), while output below 2.5V indicates discharging current (RS− > RS+). For example, with VCC = 12V and gain = 50V/V, a +75mV sense voltage yields VOUT = 2.5V + 3.75V = 6.25V; a –75mV sense yields VOUT = 2.5V – 3.75V = –1.25V (clamped at GND in practice, but measurable as deviation from 2.5V).
Can the MAX4070AUA+T be used with a 2.7V supply?
No - the MAX4070AUA+T is not rated for 2.7V operation. Its datasheet specifies a 3.6V to 24V supply range due to the 2.5V internal reference's headroom requirement. Attempting 2.7V operation risks REFOUT instability, increased offset error (>1.5%), and potential failure to meet common-mode rejection specifications. For 2.7V systems, consider MAX4071AUA+ (1.5V reference) or MAX4072AUA+ (external reference support).
What is the function of the NC pin (Pin 4) on the MAX4070AUA+T?
Pin 4 on the MAX4070AUA+T is a no-connect (NC) terminal - it is not bonded internally and serves no electrical function. It must remain unconnected on the PCB; routing traces or applying solder to this pin may cause mechanical stress or unintended coupling. The NC designation is confirmed in both the Pin Description table and the µMAX top-view diagram in the official datasheet.
Does the MAX4070AUA+T require external capacitors for stability?
The MAX4070AUA+T does not require external compensation capacitors for basic operation, but proper bypassing is essential: a 0.1µF ceramic capacitor must be placed between VCC and GND as close as possible to Pins 9 and 5. REFOUT must be kept under 500pF total capacitance (including PCB trace) to prevent oscillation; adding bulk capacitance there degrades transient response and may cause instability per Typical Operating Characteristics Figure toc10.
MAX4070AUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-uMAX/uSOP
MAX4070AUA+T FAQ
1.How can I place an order for MAX4070AUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4070AUA+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 MAX4070AUA+T reliable?
The price and inventory of MAX4070AUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4070AUA+T is usually 5 days.
3.What payment methods are accepted for MAX4070AUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4070AUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4070AUA+T?
MAX4070AUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4070AUA+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 MAX4070AUA+T?
For technical support, including MAX4070AUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4070AUA+T requirements.
6.How does Aetrix verify that MAX4070AUA+T is sourced from the original manufacturer or authorized distributors?
All MAX4070AUA+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 MAX4070AUA+T meets industry standards.
7.What is the process for return or replacement of MAX4070AUA+T?
All MAX4070AUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4070AUA+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 MAX4070AUA+T part is unused and in its original packaging.
Return procedure for MAX4070AUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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