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Analog Devices Inc./Maxim Integrated MAX16037LLA46+T
- Part No.:
- MAX16037LLA46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16037LLA46+T.pdf
- Description:
- IC BATTERY BACKUP 4.63V 8-UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,057
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Product details
Overview
The MAX16037LLA46+T from Maxim Integrated is an 8-pin μDFN low-power supervisory circuit for microprocessor systems, featuring a factory-set 4.63V reset threshold, debounced manual-reset input (MR), active-low push-pull RESET output, and battery switchover with <2µA backup current at +25°C. It operates from 1.2V to 5.5V and supports portable equipment requiring reliable brownout detection and SRAM backup.
For engineers reviewing the MAX16037LLA46+T datasheet, MAX16037LLA46+T pinout, MAX16037LLA46+T application, or MAX16037LLA46+T equivalent, key selection criteria include its 4.63V reset threshold tolerance (±0.12V), 140ms minimum reset timeout, MR input with 20kΩ internal pullup, push-pull RESET drive capability (20mA sink), and 8-pin 2mm × 2mm μDFN package with -40°C to +85°C operation.
Technical Context
The MAX16037LLA46+T integrates a precision reset generator with voltage monitoring, manual-reset assertion logic, and bidirectional power-path control between VCC and BATT. Its reset threshold is factory-trimmed to 4.63V (min 4.50V, max 4.75V) with ±0.5% typical accuracy over temperature, and it asserts RESET when VCC falls below threshold, MR is pulled low, or during power-up sequencing.
It implements a dedicated MR input with 1µs minimum pulse width support, 100ns glitch immunity at 3.3V, and 120ns propagation delay to RESET. The device uses an internal MOSFET for battery switchover with 40mV hysteresis and maintains RESET assertion for ≥140ms after VCC recovery - ensuring stable μP initialization in portable and industrial applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.63V (factory-set, 4.50V–4.75V range); ensures reliable detection of 5V supply brownout before system instability. |
| Reset Timeout Period | 140ms minimum; guarantees sufficient hold time for μP core and peripheral initialization after power recovery. |
| Supply Current (VCC = 3.6V) | 16µA typical; enables multi-year battery life in always-on backup monitoring circuits. |
| Battery Backup Current | 1µA at +25°C (VBATT = 2.8V, VCC = 0V); minimizes drain on coin-cell or supercap backup sources. |
| RESET Output Type | Active-low push-pull; delivers 20mA sink capability without external pullup, simplifying interface to μP reset inputs. |
| Operating Temperature Range | -40°C to +85°C; qualified for industrial and extended-temperature embedded deployments. |
| Package | 8-pin µDFN (2mm × 2mm); enables high-density PCB layout in space-constrained portable designs. |
Pinout & Package
MAX16037LLA46+T is housed in an 8-pin, 2mm × 2mm µDFN package with exposed pad (EP), rated for -40°C to +85°C operation. Pin 1 is marked by a dot; the exposed pad must be soldered to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low reset output | Push-pull driver asserts low during VCC undervoltage, MR low, or power-up; holds low ≥140ms after VCC recovery. |
| 2 (PFI) | Power-fail input | Monitors external voltage divider; triggers PFO low when input falls below 1.235V (±1% hysteresis). |
| 3 (GND) | Ground reference | Common return for VCC, BATT, and signal paths; connects to EP for thermal dissipation. |
| 4 (MR) | Manual-reset input | Debounced TTL/CMOS-compatible input; internal 20kΩ pullup to VCC; asserts RESET when pulled low. |
| 5 (PFO) | Active-low power-fail output | Push-pull output goes low when PFI < 1.235V or VCC < reset threshold; used for NMI or interrupt signaling. |
| 6 (VCC) | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and supplies OUT until switchover to BATT occurs. |
| 7 (OUT) | System power output | Sources from VCC normally; switches to BATT when VCC < VTH and VBATT > VCC + 40mV; supports up to 200mA. |
| 8 (BATT) | Backup battery input | Connects coin cell or supercap; powers OUT during brownout; draws <2µA standby current in backup mode. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.63V with ±0.12V tolerance across -40°C to +85°C - eliminates external resistor networks for 5V rail monitoring. |
| Debounced manual-reset input | Internal 20kΩ pullup and 100ns glitch immunity - enables direct switch connection without RC filtering or firmware debounce. |
| Low-quiescent-current backup mode | 1µA typical battery supply current at +25°C - extends shelf life of lithium coin-cell backup beyond 10 years. |
| Integrated battery switchover MOSFET | 40mV hysteresis prevents oscillation during slow VCC ramp-down; on-resistance ≤4.6Ω at 2.5V/25mA. |
| Push-pull RESET and PFO outputs | No external pullup required; 20mA sink capability ensures robust driving of μP reset pins under noisy conditions. |
Applications
| Portable Medical Monitor | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Battery-powered handheld ECG monitor with SRAM-based waveform buffer and real-time clock. IC Role / Device Role / Timing Role: Supervises 5V main supply and provides seamless switchover to CR2032 coin cell during AC loss; asserts RESET to halt CPU and preserve RAM state. Use Value: Guarantees >10-year coin-cell life via 1µA backup current and prevents data corruption during brownout via 140ms reset hold time. |
Use Scenario: DIN-rail mounted PLC module with isolated I/O and nonvolatile configuration storage. IC Role / Device Role / Timing Role: Monitors 5V system rail and asserts RESET on undervoltage; uses MR input for operator-initiated cold restart via front-panel button. Use Value: Eliminates need for discrete reset IC + manual reset circuit, reducing BOM count by 3 components while meeting IEC 61000-4-4 surge immunity requirements. |
| Retail POS Terminal | Smart Energy Meter |
|
Use Scenario: Compact countertop payment terminal with flash memory and secure element, operating on 5V USB-C input. IC Role / Device Role / Timing Role: Provides power-fail warning (PFO) to trigger immediate flash write completion before shutdown; manages SRAM backup via OUT/BATT path. Use Value: Prevents transaction data loss during sudden power interruption using deterministic 4µs PFI-to-PFO delay and 1.235V precision comparator. |
Use Scenario: ANSI C12.20-compliant electricity meter with RTC, tamper-detection SRAM, and optical port. IC Role / Device Role / Timing Role: Supervises 3.3V auxiliary rail derived from meter's DC-DC converter; asserts RESET if rail drops below 3.08V (using MAX16036 variant logic, adapted for 4.63V threshold on primary rail). Use Value: Ensures metrology ASIC resets cleanly during line sags, avoiding calibration drift caused by marginal supply operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16037PLA46+T | Same 4.63V reset threshold and 8-pin µDFN package, but features open-drain RESET and PFO outputs instead of push-pull. | Requires external pullup resistors; better suited for wired-OR interrupt buses or level-shifted interfaces. | Select when interfacing to legacy μPs requiring open-drain reset or shared NMI lines with other peripherals. |
| MAX16033LLA46+T | 10-pin µDFN variant with identical 4.63V threshold, but adds chip-enable gating (CEIN/CEOUT) and lacks MR input. | Supports CE signal protection for CMOS RAM during brownout; not compatible with manual reset requirement. | Choose when protecting memory access paths is critical and manual reset is unnecessary - e.g., headless industrial controllers. |
Compared with MAX16037PLA46+T, the MAX16037LLA46+T eliminates external pullups and simplifies layout; compared with MAX16033LLA46+T, it trades CE gating for MR functionality - making it optimal for user-serviceable devices needing physical reset buttons.
Availability
MAX16037LLA46+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, retail POS terminals, and smart energy meters requiring stable component supply across long production lifecycles.
Supply support for MAX16037LLA46+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 precision analog and mixed-signal ICs for power, sensing, and connectivity applications, with deep expertise in supervisory and battery-management solutions.
The MAX16033–MAX16040 family was engineered specifically for space-constrained, battery-backed microprocessor systems requiring ultra-low quiescent current, accurate voltage monitoring, and seamless power switchover - targeting portable, industrial, and metering markets.
FAQ
What is the exact reset threshold voltage of the MAX16037LLA46+T?
The MAX16037LLA46+T has a factory-trimmed reset threshold of 4.63V, with guaranteed limits of 4.50V (minimum) and 4.75V (maximum) across -40°C to +85°C. This value is laser-trimmed during production and does not require external resistor configuration - enabling precise 5V supply monitoring without calibration.
Does the MAX16037LLA46+T support battery backup for SRAM retention?
Yes, the MAX16037LLA46+T supports SRAM retention via its integrated battery switchover function. When VCC falls below 4.63V and VBATT exceeds VCC by 40mV, the device automatically connects BATT to OUT. In this mode, it draws only 1µA (typical) from the battery at +25°C, enabling multi-year retention with standard coin cells.
Can the MAX16037LLA46+T be used without a backup battery?
Yes, the MAX16037LLA46+T operates fully without a backup battery. In such configurations, connect BATT to GND and route VCC directly to OUT. All supervisory functions - including RESET generation, MR input, and PFI/PFO monitoring - remain fully functional, making it suitable for cost-sensitive applications where backup is optional.
What is the function of the MR pin on the MAX16037LLA46+T?
The MR (Manual Reset) pin on the MAX16037LLA46+T is a debounced, TTL/CMOS-compatible input with an internal 20kΩ pullup to VCC. Driving MR low asserts the RESET output immediately and holds it low for ≥140ms after MR returns high - enabling hardware-initiated system resets via momentary switches without external debounce circuitry.
Is the MAX16037LLA46+T RoHS-compliant and lead-free?
Yes, the MAX16037LLA46+T is RoHS-compliant and lead-free, as indicated by the '+' suffix in the part number. It meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards, with peak temperature rating of +300°C for 10 seconds.
MAX16037LLA46+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µDFN (2x2)
MAX16037LLA46+T FAQ
1.How can I place an order for MAX16037LLA46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16037LLA46+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 MAX16037LLA46+T reliable?
The price and inventory of MAX16037LLA46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16037LLA46+T is usually 5 days.
3.What payment methods are accepted for MAX16037LLA46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16037LLA46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16037LLA46+T?
MAX16037LLA46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16037LLA46+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 MAX16037LLA46+T?
For technical support, including MAX16037LLA46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16037LLA46+T requirements.
6.How does Aetrix verify that MAX16037LLA46+T is sourced from the original manufacturer or authorized distributors?
All MAX16037LLA46+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 MAX16037LLA46+T meets industry standards.
7.What is the process for return or replacement of MAX16037LLA46+T?
All MAX16037LLA46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16037LLA46+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 MAX16037LLA46+T part is unused and in its original packaging.
Return procedure for MAX16037LLA46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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