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Analog Devices Inc./Maxim Integrated MAX6037BAUK21
- Part No.:
- MAX6037BAUK21
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6037BAUK21.pdf
- Description:
- LOW-POWER, FIXED REFERENCE
- Quantity:
- Payment:
- Shipping:
Inventory:2,109
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Product details
Overview
MAX6037BAUK21 from Maxim Integrated is a precision 2.048V fixed-output, low-dropout series voltage reference with active-low shutdown, ±0.3% initial accuracy, 50ppm/°C max temperature coefficient, 100mV max dropout at 1mA, and 275µA max quiescent current. It operates from 2.5V to 5.5V supply and delivers ±5mA load current, serving as a stable reference in high-resolution ADC/DAC biasing and portable medical instrumentation.
For engineers reviewing the MAX6037BAUK21 datasheet, MAX6037BAUK21 pinout, MAX6037BAUK21 application, or MAX6037BAUK21 equivalent, key selection criteria include its automotive-grade -40°C to +125°C operation, SOT23-5 package compatibility, 0.02µF–1µF capacitive-load stability, and sub-500nA shutdown current for ultra-low-power system wake-up control.
Technical Context
The MAX6037BAUK21 implements a bandgap-based series-mode reference architecture with integrated shutdown logic. Its output is internally trimmed to 2.048V at +25°C and stabilized over temperature via curvature-compensated circuitry, achieving ≤50ppm/°C drift across the full automotive range.
Shutdown is controlled by an active-low SHDN pin with logic thresholds of VENL ≤ 0.7V and VENH ≥ 2.0V, enabling direct interface with 3.3V or 5V microcontrollers. The device maintains output impedance <1Ω in active mode and >200kΩ when disabled, ensuring minimal loading during sleep states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V ±0.3% (max) at +25°C - enables precise 12-bit+ ADC full-scale calibration without trimming |
| Tempco | ≤50ppm/°C (max) - ensures ≤±0.62mV output drift over -40°C to +125°C for automotive sensor front-ends |
| Dropout Voltage | ≤100mV at 1mA load - supports operation from 2.148V input, critical for single-cell Li-ion or coin-cell systems |
| Quiescent Current | ≤275µA - allows continuous operation in always-on monitoring circuits with multi-year battery life |
| Shutdown Current | ≤500nA - reduces standby power to nanowatt level, suitable for wake-on-event architectures |
| Load Drive | ±5mA sourcing/sinking - directly drives ADC reference inputs, op-amp bias networks, or small DACs |
| Capacitive Stability | 0.02µF to 1µF output capacitor - accommodates ceramic, tantalum, or polymer caps without oscillation |
Pinout & Package
MAX6037BAUK21 is housed in a lead-free 5-pin SOT23-5 package (package code U5-2, top mark AEIZ), with 0.95mm pitch and 2.9mm × 1.6mm footprint. Thermal pad is not present; standard reflow profiles apply.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ADJ) | Internal connection (no external connection) | Internally tied off for fixed-output variants - must remain unconnected to avoid malfunction |
| 2 (GND) | Analog ground reference | Low-impedance return path for reference output and internal bandgap; requires dedicated PCB ground plane |
| 3 (SHDN) | Active-low enable control | Pull ≤0.7V to disable output and reduce supply current to <500nA; tie to IN for always-on operation |
| 4 (IN) | Positive supply input | Accepts 2.5V–5.5V; requires 0.1µF bypass cap to GND close to pin for PSRR and transient immunity |
| 5 (OUT) | Precision reference output | Delivers stable 2.048V; connect 0.02µF–1µF capacitor to GND to ensure stability and reduce noise |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.048V Output | Matches common 12-bit ADC full-scale (212 = 4096 → 2.048V × 2 = 4.096V), eliminating external scaling resistors |
| Automotive Temperature Range | Specified from -40°C to +125°C - qualified for under-hood and ADAS sensor modules without derating |
| Low Dropout | 100mV max at 1mA enables use with low-headroom supplies like 2.2V LDO outputs or partially discharged batteries |
| Sub-500nA Shutdown | Reduces system standby power to <1µW with 2.048V rail - essential for energy-harvesting and IoT edge nodes |
| Capacitor-Tolerant Stability | Stable with 0.02µF ceramic or 1µF tantalum output caps - simplifies BOM and avoids costly low-ESR alternatives |
Applications
| Portable ECG Monitors | Automotive Cabin Air Quality Sensors |
|---|---|
|
Use Scenario: Battery-powered handheld ECG units requiring 12-bit analog front-end precision with multi-week runtime. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for 12-bit SAR ADC sampling biopotential signals. Use Value: ±0.3% initial accuracy and 50ppm/°C tempco ensure diagnostic-grade signal fidelity across ambient temperature shifts. |
Use Scenario: NDIR CO₂ sensor module mounted near HVAC ducts in vehicles, exposed to wide thermal cycling. IC Role / Device Role / Timing Role: Supplies excitation reference for thermopile amplifier and ADC in gas concentration calculation. Use Value: -40°C to +125°C operation and 50ppm/°C drift maintain measurement repeatability despite cabin temperature swings. |
| Wireless Industrial Pressure Transmitters | Programmable Logic Controller (PLC) Analog Input Modules |
|
Use Scenario: LoRaWAN-enabled pressure sensor node powered by primary lithium battery, transmitting every 15 minutes. IC Role / Device Role / Timing Role: Reference source for sigma-delta ADC converting bridge output; enabled only during conversion burst. Use Value: 500nA shutdown current extends 10-year battery life; 100mV dropout allows operation down to 2.15V battery voltage. |
Use Scenario: DIN-rail mounted PLC I/O module accepting 4–20mA and 0–10V field signals with 16-bit resolution. IC Role / Device Role / Timing Role: Precision reference for dual-slope or SAR ADC used in isolated analog input channel digitization. Use Value: 275µA quiescent current minimizes self-heating error; ±5mA drive capability eliminates need for buffer op-amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3020AIDBZR | 2.048V, ±0.2% initial accuracy, 50ppm/°C, 50µA quiescent current, no shutdown | Lacks active shutdown; lower IQ but no sleep mode - suited for always-on, low-power systems | Select when shutdown is unnecessary and lowest possible operating current is prioritized over system-level power gating |
| ADR3420ARJZ-R7 | 2.048V, ±0.1% initial accuracy, 10ppm/°C, 120µA quiescent current, no shutdown | Higher accuracy and lower tempco, but no shutdown and larger SOT23-6 footprint | Choose for metrology-grade applications where 0.1% tolerance and 10ppm/°C stability outweigh size and power-control needs |
Compared with REF3020AIDBZR and ADR3420ARJZ-R7, the MAX6037BAUK21 uniquely integrates shutdown control in a compact SOT23-5 package while maintaining automotive temperature rating - making it optimal for battery-constrained, intermittently active sensing nodes.
Availability
MAX6037BAUK21 is available at Aetrix Electronics and suitable for portable medical devices, automotive cabin sensors, wireless industrial transmitters, and PLC analog input modules requiring stable component supply across extended product lifecycles.
Supply support for MAX6037BAUK21 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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX6037 family delivers micropower, high-accuracy voltage references with shutdown for battery-sensitive systems requiring guaranteed performance across extreme temperatures - targeting data acquisition, sensor conditioning, and portable instrumentation.
FAQ
What is the output voltage tolerance and temperature coefficient of the MAX6037BAUK21?
The MAX6037BAUK21 has a nominal output voltage of 2.048V with ±0.3% initial accuracy at +25°C and a maximum temperature coefficient of 50ppm/°C over the -40°C to +125°C range. These specifications are guaranteed per the datasheet's electrical characteristics table for MAX6037B_21, confirming its suitability for automotive and industrial applications where thermal stability is critical. The MAX6037BAUK21 meets these values without requiring external calibration.
Can the MAX6037BAUK21 be used with a 2.2V supply?
No - the MAX6037BAUK21 requires a minimum supply voltage of 2.5V, as specified in its absolute maximum ratings and electrical characteristics. At 2.2V, the device will not regulate properly and may exhibit increased dropout or failure to start up. For 2.2V systems, consider alternative references with lower VIN minima, or use a step-up converter to meet the 2.5V requirement. The MAX6037BAUK21's 100mV dropout applies only when VIN ≥ 2.5V.
How does the shutdown function operate on the MAX6037BAUK21?
The MAX6037BAUK21 features an active-low SHDN pin (Pin 3). Pulling SHDN ≤ 0.7V disables the output and reduces supply current to ≤500nA; connecting SHDN to IN enables normal operation. The logic-high threshold is ≥2.0V, ensuring compatibility with 3.3V and 5V GPIOs. During shutdown, the output is high-impedance (>200kΩ), preventing loading of downstream circuitry. This behavior is verified in the MAX6037_21 shutdown electrical characteristics table.
Is the MAX6037BAUK21 pin-compatible with other MAX6037 fixed-output variants?
Yes - all MAX6037 fixed-output variants (e.g., MAX6037AAUK12, MAX6037CAUK21, MAX6037BAUK33) share identical 5-pin SOT23-5 packaging, pinout, and footprint (U5-2). The ADJ pin (Pin 1) is internally connected and must remain unconnected across all fixed versions. This uniformity allows drop-in replacement between output voltages during design iteration or inventory optimization, provided system-level voltage and accuracy requirements align.
What output capacitor value is recommended for stable operation of the MAX6037BAUK21?
The MAX6037BAUK21 is stable with output capacitors ranging from 0.02µF to 1µF, as confirmed in the "Capacitive-Load Stability Range" parameter (COUT = 0.02µF to 1µF) for MAX6037_21. A 0.1µF X7R ceramic capacitor placed close to the OUT and GND pins is recommended for optimal noise suppression and transient response. Larger values (e.g., 1µF) improve low-frequency ripple rejection but increase turn-on settling time; smaller values (e.g., 0.02µF) minimize board space while maintaining stability.
MAX6037BAUK21 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.3%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- 11µVp-p
- Noise - 10Hz to 10kHz:
- 25µVrms
- Voltage - Input:
- 2.5V ~ 5.5V
- Current - Supply:
- 275µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6037BAUK21 FAQ
1.How can I place an order for MAX6037BAUK21 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6037BAUK21 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 MAX6037BAUK21 reliable?
The price and inventory of MAX6037BAUK21 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6037BAUK21 is usually 5 days.
3.What payment methods are accepted for MAX6037BAUK21?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6037BAUK21 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6037BAUK21?
MAX6037BAUK21 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6037BAUK21 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 MAX6037BAUK21?
For technical support, including MAX6037BAUK21 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6037BAUK21 requirements.
6.How does Aetrix verify that MAX6037BAUK21 is sourced from the original manufacturer or authorized distributors?
All MAX6037BAUK21 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 MAX6037BAUK21 meets industry standards.
7.What is the process for return or replacement of MAX6037BAUK21?
All MAX6037BAUK21 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6037BAUK21, 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 MAX6037BAUK21 part is unused and in its original packaging.
Return procedure for MAX6037BAUK21:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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