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Analog Devices Inc./Maxim Integrated MAX9643UATA+T
- Part No.:
- MAX9643UATA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
MAX9643UATA+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,782
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Product details
Overview
The MAX9643UATA+T from Maxim Integrated is a unidirectional high-side current-sense amplifier with 10V/V fixed gain, 60V input common-mode range (-1.5V to +60V), 10MHz signal bandwidth, and 130µV max input offset voltage at +25°C. It operates from -40°C to +125°C in an 8-pin TDFN (2mm × 3mm) package and enables precision current monitoring in DC-DC converter control loops, H-bridge motor drivers, and high-brightness LED power stages.
For engineers reviewing the MAX9643UATA+T datasheet, MAX9643UATA+T pinout, MAX9643UATA+T application, or MAX9643UATA+T equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX9643UATA+T uses a proprietary high-speed complementary BiCMOS SOI process to achieve ultra-low noise, wide dynamic-range sensing, and stable performance across its full -1.5V to +60V input common-mode range. Its internal 250kHz charge pump generates a negative rail to bias both input and output stages, enabling true ground-referenced output and sub-ground common-mode operation.
This architecture eliminates crossover inaccuracies found in dual-stage input designs and supports fast transient response-100ns delay from input saturation to VOL and 1µs recovery from output saturation-making it suitable for closed-loop switching power supply control where phase margin and loop stability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed Gain | 10V/V - sets output scaling for 10× sense voltage; enables use of smaller RSENSE without sacrificing ADC resolution. |
| Input Common-Mode Range | -1.5V to +60V - allows high-side sensing on rails shorted to ground or floating above system ground; no external level-shifting required. |
| Signal Bandwidth | 10MHz - supports accurate current measurement in fast-switching converters (e.g., >1MHz buck/boost topologies) with minimal phase lag. |
| Input Offset Voltage (max) | 130µV at +25°C - limits worst-case error to ±1.3mV output error at 10V/V gain; critical for low-current accuracy with mΩ sense resistors. |
| Quiescent Supply Current | 1400µA max - enables integration into power-sensitive industrial systems without significant standby loss. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive auxiliary supplies, industrial SMPS, and telecom base station power modules. |
| Output Voltage Low (VOL) | ≤8.8mV at 100µA sink, -40°C to +125°C - ensures compatibility with low-voltage ADC reference inputs and rail-to-rail analog interfaces. |
Pinout & Package
Package: 8-pin TDFN-EP (2mm × 3mm, 0.5mm pitch), exposed pad (EP) required to be connected to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Main signal and power return; EP must be soldered to GND plane for θJA = 60°C/W and EMI suppression. |
| 2 VEE | Charge-pump negative output | Provides internal -4.7V rail; connect 1µF ceramic capacitor to GND for stable low-noise operation. |
| 3 CP1 | Flying capacitor positive terminal | Connects to one end of 1µF flying cap; tight layout minimizes charge-pump ripple coupling into RS+/RS-. |
| 4 CP2 | Flying capacitor negative terminal | Connects to other end of 1µF flying cap; forms charge-transfer path for internal negative rail generation. |
| 5 RS+ | Positive sense resistor input | High-impedance input tied to high-side of shunt; accepts up to +60V common-mode while rejecting noise via CMRR ≥110dB. |
| 6 RS- | Negative sense resistor input | Differential partner to RS+; together they define VSENSE = VRS+ – VRS-; ESD rated ±4kV HBM. |
| 7 VCC | Supply voltage input | Accepts 2.7V–36V; powers internal circuitry and charge pump; independent of monitored rail voltage. |
| 8 OUT | Amplified current-sense output | Single-ended output scaled by 10× VSENSE; drives ADCs, comparators, or controllers with ≤30pF capacitive load. |
Key Features
| Feature | Design Value |
|---|---|
| True ground-referenced output | VOL ≤ 8.8mV over full temperature range enables direct interface to 0V-referenced ADCs without level-shifting circuitry. |
| Sub-ground common-mode capability | -1.5V minimum VCM allows sensing during rail fault conditions (e.g., short-to-ground) without input stage saturation or error. |
| High AC CMRR (≥90dB @ 100kHz) | Rejects high-frequency noise from switching nodes (e.g., MOSFET gate drive coupling), preserving signal integrity in noisy power domains. |
| Low gain error (0.5% max at +25°C) | Ensures consistent current-to-voltage scaling across production units; reduces calibration burden in automated test and field deployment. |
| Internal charge-pump architecture | Eliminates need for external negative supply; simplifies BOM and PCB layout while maintaining precision at low VCC (≥2.7V). |
Applications
| Industrial Power Supplies | GSM Base Station Power Supply |
|---|---|
|
Use Scenario: Monitoring output current in 48V intermediate bus converters feeding distributed DC-DC modules. IC Role / Device Role / Timing Role: High-side unidirectional current-sense amplifier providing real-time feedback to digital PWM controller for overcurrent protection and load balancing. Use Value: 10MHz bandwidth ensures accurate capture of fast transient currents during burst-mode operation; 60V VCM accommodates bus transients up to 65V without clamping. |
Use Scenario: Load current sensing in redundant -48V telecom rectifier modules with hot-swap capability. IC Role / Device Role / Timing Role: Precision current monitor feeding FPGA-based power management unit for predictive failure analysis and graceful shutdown. Use Value: 130µV VOS enables detection of <10mA faults using 10mΩ shunts; -40°C to +125°C rating matches telecom environmental requirements. |
| High-Brightness LED Control | H-Bridge Motor Control |
|
Use Scenario: Constant-current regulation in multi-string LED drivers for outdoor signage with PWM dimming. IC Role / Device Role / Timing Role: High-side current amplifier feeding analog input of LED driver IC to close current loop independently of forward voltage variation. Use Value: 10V/V gain provides sufficient output swing for 10-bit ADCs even with 50mV sense drops; true-VOL supports low-dropout LED string configurations. |
Use Scenario: Phase current sensing in 24V brushed DC motor drives with regenerative braking. IC Role / Device Role / Timing Role: Unidirectional high-side amplifier measuring current through upper FET during active PWM periods for torque control and stall detection. Use Value: -1.5V to +60V VCM tolerates shoot-through transients and ground bounce; 100ns saturation recovery prevents missed overcurrent events during fast switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage unidirectional current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | Gain = 20V/V; 800kHz bandwidth; 50µV max VOS; AEC-Q100 qualified; SOIC-8 package. | Designed for automotive motor control; lower bandwidth limits use in >500kHz switching converters. | Select when AEC-Q100 compliance is mandatory and bandwidth demand is ≤800kHz; not drop-in due to different gain and package. |
| LT6106IMS8#TRPBF | Gain = 100V/V; 1.5MHz bandwidth; 150µV max VOS; MSOP-8 package; no charge pump. | Lacks sub-ground VCM capability (-0.3V min); requires external negative supply for true ground output. | Choose when higher gain is needed for µA-level current sensing; avoid if -1.5V VCM or single-supply ground-referenced output is required. |
Compared with the MAX9643UATA+T, the INA240A1QDRQ1 offers tighter offset but significantly lower bandwidth and automotive qualification, while the LT6106IMS8#TRPBF provides higher gain but sacrifices sub-ground operation and requires external biasing-neither is pin-compatible, and both necessitate layout and control-loop revalidation.
Availability
MAX9643UATA+T is available at Aetrix Electronics and suitable for industrial power supplies, GSM base station power modules, and high-brightness LED drivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX9643UATA+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, designs high-performance analog, mixed-signal, and RF ICs for industrial, communications, and computing applications.
The MAX9643UATA+T belongs to Maxim's precision current-sense amplifier product line, engineered specifically for high-voltage, high-speed power-conversion monitoring where accuracy, speed, and robustness across extreme temperatures are essential.
FAQ
What is the maximum input common-mode voltage supported by the MAX9643UATA+T?
The MAX9643UATA+T supports an input common-mode voltage range of -1.5V to +60V across its full operating temperature range. This allows the device to monitor current on high-side shunts even when the power rail is shorted to ground or floats above system ground. The +60V maximum is guaranteed over the entire VCC range (2.7V to 36V), and absolute maximum rating is +65V-exceeding this risks permanent damage. The MAX9643UATA+T achieves this wide range using an internal charge pump that biases the input stage.
Does the MAX9643UATA+T require an external negative supply?
No, the MAX9643UATA+T does not require an external negative supply. It integrates a 250kHz internal charge pump that generates a negative rail to bias both the input and output stages. This enables its -1.5V input common-mode capability and true ground-referenced output (VOL ≤ 8.8mV). Users must connect a 1µF ceramic capacitor between CP1 and CP2 pins and another from VEE to GND; no external negative voltage source is needed unless overriding the internal pump with a stable -5V supply.
What is the gain error specification for the MAX9643UATA+T over temperature?
The MAX9643UATA+T has a gain error of 0.5% maximum at +25°C and 0.6% maximum over the full -40°C to +125°C operating temperature range. This specification is measured using two-point VSENSE inputs (10mV and 100mV) and reflects the deviation from ideal 10V/V scaling. The low drift ensures consistent current-to-voltage conversion across thermal cycling, reducing calibration frequency in industrial and telecom applications where ambient temperature varies widely.
Can the MAX9643UATA+T be used in bidirectional current-sensing applications?
No, the MAX9643UATA+T is strictly a unidirectional current-sense amplifier. Its architecture and specifications-including input common-mode range, output polarity, and internal charge-pump design-are optimized for sensing current flow in one direction only (from RS+ to RS-). For bidirectional applications, such as H-bridge motor control with regenerative braking in both directions, a dedicated bidirectional amplifier like the MAX40056 or INA229 would be required instead of the MAX9643UATA+T.
What is the recommended bypass capacitor for the VCC pin of the MAX9643UATA+T?
A 0.1µF ceramic capacitor placed as close as possible between the VCC pin and GND is the recommended bypass for the MAX9643UATA+T. This value is validated in the datasheet's Power-Supply Bypassing section and suppresses high-frequency noise from the supply rail without compromising stability. In high-noise environments, a parallel combination of 0.1µF and 1µF ceramics may be used-but the 0.1µF must remain the primary, shortest-path decoupling element adjacent to the VCC pin to ensure optimal transient response and PSRR performance.
MAX9643UATA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 12V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 35 µA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 1mA
- Current - Output / Channel:
- 3.39 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x3)
MAX9643UATA+T FAQ
1.How can I place an order for MAX9643UATA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9643UATA+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 MAX9643UATA+T reliable?
The price and inventory of MAX9643UATA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9643UATA+T is usually 5 days.
3.What payment methods are accepted for MAX9643UATA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9643UATA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9643UATA+T?
MAX9643UATA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9643UATA+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 MAX9643UATA+T?
For technical support, including MAX9643UATA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9643UATA+T requirements.
6.How does Aetrix verify that MAX9643UATA+T is sourced from the original manufacturer or authorized distributors?
All MAX9643UATA+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 MAX9643UATA+T meets industry standards.
7.What is the process for return or replacement of MAX9643UATA+T?
All MAX9643UATA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9643UATA+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 MAX9643UATA+T part is unused and in its original packaging.
Return procedure for MAX9643UATA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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