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Analog Devices Inc./Maxim Integrated MAX9634WEUK+T
- Part No.:
- MAX9634WEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX9634WEUK+T.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,561
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Product details
Overview
The MAX9634WEUK+T from Maxim Integrated is a unidirectional high-side current-sense amplifier with 200V/V fixed gain, 250μV (max) input offset voltage, <0.7% (max) gain error over -40°C to +85°C, and ultra-low 1μA (max) quiescent supply current. It operates from 1.6V to 28V common-mode input range and delivers voltage output for precision battery current monitoring in portable power-management systems.
For engineers reviewing the MAX9634WEUK+T datasheet, MAX9634WEUK+T pinout, MAX9634WEUK+T application, or MAX9634WEUK+T equivalent, this device supports low-voltage-drop sensing down to 2.5mV full-scale VSENSE, enables compact layout via 5-pin SOT23 packaging, and targets high-accuracy, low-power portable electronics where supply current, offset, and gain stability are critical selection criteria.
Technical Context
The MAX9634WEUK+T uses a BiCMOS-based architecture with matched internal gain resistors (R1 = 100Ω, ROUT = 20kΩ) to achieve precise 200V/V amplification of the differential sense voltage (VSENSE = VRS+ − VRS−). Its high-voltage p-channel FET input stage enables operation directly from the sensed rail without separate VCC.
Input common-mode range (1.6V–28V) is enforced by CMRR ≥94dB (typ 130dB), and output is internally clamped to 6V with 7mA current limiting. The device is stable with any external capacitance and exhibits 15kHz small-signal bandwidth at 200V/V gain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V - sets output scaling: VOUT = 200 × (VRS+ − VRS−), enabling 2.5mV full-scale sensing at 0.5V output |
| Input Offset Voltage (max) | 250μV - contributes ≤0.5% error at 50mV VSENSE; allows accurate low-current detection with small RSENSE |
| Gain Error (max) | ±0.7% - limits total measurement uncertainty; specified over full -40°C to +85°C operating range |
| Supply Current (max) | 1μA - enables multi-year battery life in always-on monitoring; independent of VRS+ up to 28V |
| Common-Mode Input Range | 1.6V to 28V - supports direct connection to Li-ion, Li-poly, and 24V industrial rails without level-shifting |
| Small-Signal Bandwidth | 15kHz - sufficient for DC–10kHz current monitoring in battery charge/discharge control loops |
| Output Voltage Swing | 0.1V to 0.2V above GND (VOH), up to VRS+ − VSENSE − VOH - defines minimum RS+ required for full-scale output |
Pinout & Package
MAX9634WEUK+T is housed in a RoHS-compliant 5-pin SOT23 package (outline U5-2, land pattern 90-0174), with 1.6mm × 2.9mm footprint and 1.1mm height. Thermal resistance θJA = 256°C/W; derating is 3.9mW/°C above +70°C.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal circuitry and output stage; must be connected to system ground plane |
| 2 | RS+ | High-side sense resistor connection to power rail; carries full load current and defines common-mode input |
| 3 | OUT | Voltage output proportional to VSENSE; drives ADC inputs or comparator thresholds with 10kΩ typical load |
| 4 | RS− | High-side sense resistor connection to load; forms differential input pair with RS+ for current measurement |
| 5 | GND | Second ground terminal-bypasses return current path to minimize ground loop errors in Kelvin layouts |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1μA max enables >10-year battery life in always-on current monitors for IoT sensors and wearables |
| Precision offset voltage | 250μV max ensures ≤1% error at 25mV full-scale VSENSE, supporting sub-10mA current resolution |
| Wide common-mode range | 1.6V–28V allows direct integration into single-cell Li-ion (2.7–4.2V) and 24V industrial systems without auxiliary supplies |
| Stable with capacitive loads | No external compensation required-supports direct connection to ADC sample-and-hold capacitors up to 1nF |
| Output protection | 6V clamp and 7mA current limit prevent damage during overvoltage or short-circuit events on OUT pin |
Applications
| Smartphone Battery Monitoring | USB-C Power Delivery Analyzer |
|---|---|
|
Use Scenario: Real-time charge/discharge current tracking in smartphone PMIC subsystems using a 5mΩ sense resistor. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level VSENSE into 0–1V analog output for ADC digitization. Use Value: Enables ±1% current accuracy across 0–3A range while consuming <1μA, extending standby time without sacrificing measurement fidelity. |
Use Scenario: Bidirectional current sensing in USB-C PD sink devices to validate compliance with 3A/5A/10A profiles. IC Role / Device Role / Timing Role: Unidirectional high-side amplifier used in dual configuration (two MAX9634WEUK+T) to isolate charge vs. discharge paths. Use Value: 200V/V gain supports 2.5mV full-scale sensing-matching USB-C's 10mV/mΩ reference-while maintaining 15kHz bandwidth for transient response. |
| Industrial Portable Test Equipment | Medical Wearable Battery Management |
|
Use Scenario: Precision current measurement in handheld multimeters and clamp meters with auto-ranging shunt resistors. IC Role / Device Role / Timing Role: Front-end signal conditioner for microcontroller ADC, rejecting common-mode noise from switching power rails. Use Value: 94dB CMRR suppresses 50/60Hz interference and switching ripple; 1.6V min VCM supports operation down to depleted battery states. |
Use Scenario: Low-power, long-life current monitoring in implantable or patch-style medical wearables powered by coin cells. IC Role / Device Role / Timing Role: High-side sensor interfacing between battery and ultra-low-power MCU, delivering analog current data every 10 seconds. Use Value: 1μA ICC extends 220mAh CR2032 battery life beyond 7 years in sleep mode; 250μV VOS ensures reliable detection of microamp leakage currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA219BIDR | I²C digital output, 12-bit ADC integrated; 10μA supply current; 0.1% gain error; 26V max VCM | Requires MCU I²C interface and firmware support; eliminates external ADC but adds protocol overhead | Select when digital output, calibration storage, or bus sharing simplifies system architecture |
| MAX40056AUT+T | 200V/V gain, 125μV VOS (max), 0.3% gain error, 2.7V–36V VCM, 2.5μA ICC, SOT23-5 | Higher precision and wider VCM, but 2.5× higher supply current limits ultra-low-power use cases | Select when tighter offset/gain specs justify increased ICC in industrial-grade portable equipment |
Compared with INA219BIDR and MAX40056AUT+T, the MAX9634WEUK+T uniquely balances nano-power consumption (1μA), production-tested 250μV offset, and 200V/V gain in a legacy-compatible SOT23 footprint-making it optimal for cost-sensitive, battery-constrained designs requiring analog output and minimal BOM count.
Availability
MAX9634WEUK+T is available at Aetrix Electronics and suitable for notebook computers, USB-C power analyzers, and medical wearable battery management systems requiring stable component supply, long-lifecycle availability, and RoHS-compliant sourcing.
Supply support for MAX9634WEUK+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 power-management ICs for industrial, computing, and portable applications.
The MAX9634WEUK+T belongs to the nanoPower™ high-side current-sense amplifier product line, designed specifically for ultra-low-quiescent-current, high-accuracy current monitoring in space- and energy-constrained battery-powered systems.
FAQ
What is the operating temperature range for MAX9634WEUK+T?
The MAX9634WEUK+T is specified over the -40°C to +85°C extended temperature range. This range covers standard commercial and industrial portable equipment environments. Unlike the automotive-grade MAX9634FEUK+, the MAX9634WEUK+T does not extend to +125°C, and its gain error and offset voltage limits are guaranteed only within this -40°C to +85°C span per the datasheet's Electrical Characteristics table.
Does MAX9634WEUK+T require an external power supply pin?
No, the MAX9634WEUK+T has no dedicated VCC pin. It derives operating power directly from the sensed high-side rail via the RS+ and RS− pins. The supply current flows into RS+ and RS−, with the device functioning as long as the common-mode voltage at those pins remains between 1.6V and 28V. This eliminates need for auxiliary regulators and simplifies PCB layout in battery-fed systems.
What is the maximum sense voltage (VSENSE) that MAX9634WEUK+T can accurately measure?
The MAX9634WEUK+T supports full-scale VSENSE up to 15mV at 200V/V gain, producing a 3V output. However, usable VSENSE depends on minimum RS+ voltage: VSENSE(max) = VRS+(min) − VOH − VOUT(min). With VRS+(min) = 1.6V and VOH = 0.2V, the practical full-scale VSENSE is ~15mV for 3V output. Exceeding this causes clipping; the device remains functional but loses linearity beyond that point.
Can MAX9634WEUK+T be used in bidirectional current sensing applications?
The MAX9634WEUK+T is unidirectional and measures only current flowing from RS+ to RS−. For true bidirectional sensing, two MAX9634WEUK+T devices must be used-one for charge (RS+ to battery, RS− to load) and one for discharge (RS+ to load, RS− to battery)-with outputs referenced to separate ground domains. The datasheet confirms this dual-amplifier approach in its "Bidirectional Application" section (Figure 1).
What is the output impedance of MAX9634WEUK+T and how does it affect ADC interfacing?
The MAX9634WEUK+T has a typical output resistance (ROUT) of 20kΩ, with a range of 14.0kΩ to 26.4kΩ. This relatively high impedance means it should drive ADC inputs with ≥100kΩ input impedance or be buffered. Direct connection to SAR ADCs with low-input-impedance sample-and-hold stages may cause settling errors; adding a 100pF–1nF ceramic capacitor from OUT to GND improves stability and reduces noise without compromising 15kHz bandwidth.
MAX9634WEUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- nanoPower
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- 125 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 1.1µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- -
- Voltage - Supply Span (Max):
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX9634WEUK+T FAQ
1.How can I place an order for MAX9634WEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9634WEUK+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 MAX9634WEUK+T reliable?
The price and inventory of MAX9634WEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9634WEUK+T is usually 5 days.
3.What payment methods are accepted for MAX9634WEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9634WEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9634WEUK+T?
MAX9634WEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9634WEUK+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 MAX9634WEUK+T?
For technical support, including MAX9634WEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9634WEUK+T requirements.
6.How does Aetrix verify that MAX9634WEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX9634WEUK+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 MAX9634WEUK+T meets industry standards.
7.What is the process for return or replacement of MAX9634WEUK+T?
All MAX9634WEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9634WEUK+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 MAX9634WEUK+T part is unused and in its original packaging.
Return procedure for MAX9634WEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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