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Analog Devices Inc./Maxim Integrated MAX16039LLA44+T
- Part No.:
- MAX16039LLA44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16039LLA44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,996
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Product details
Overview
The MAX16039LLA44+T from Maxim Integrated is an 8-pin μDFN battery-backup supervisory IC with active-low push-pull reset, battery-on (BATTON) indicator, and power-fail warning functionality. It operates from 1.2V to 5.5V, features a factory-set 4.38V reset threshold (±0.13V), 140ms minimum reset timeout, and draws only 13µA quiescent current at 2.8V - enabling reliable SRAM retention in portable POS terminals and industrial controllers during brownout.
For engineers reviewing the MAX16039LLA44+T datasheet, MAX16039LLA44+T pinout, MAX16039LLA44+T application, or MAX16039LLA44+T equivalent, key selection criteria include its 4.38V reset threshold accuracy, BATTON push-pull output capability, 8-pin μDFN-8 package footprint, and support for battery switchover with <2µA backup-mode supply current at -40°C to +85°C.
Technical Context
The MAX16039LLA44+T implements a precision voltage-monitoring architecture with a dedicated 1.235V internal reference for both PFI comparator and RESETIN input (though RESETIN is not present on MAX16039). Its reset generator asserts active-low RESET for ≥140ms after VCC rises above 4.38V, with propagation delay under 25µs during VCC fall. The integrated MOSFET-based battery switchover circuit connects BATT to OUT when VCC drops below VTH and VBATT exceeds VCC by >40mV.
As part of the MAX16033–MAX16040 family, it shares core timing and comparator blocks but omits MR, WDI, CEIN/CEOUT, and RESETIN functions - retaining only BATTON, RESET, PFI/PFO, VCC, GND, OUT, and BATT terminals. Its push-pull RESET and PFO outputs eliminate external pull-ups, while BATTON provides a dedicated high-state indicator during battery-backup mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (min 4.25V, max 4.50V) - ensures reliable reset assertion before 3.3V or 5V rail collapse. |
| Reset Timeout Period | 140ms (min), 280ms (max) - guarantees µP initialization completes before release. | Supply Current | 13µA (typ) at VCC = 2.8V - enables multi-year battery life in always-on backup applications. |
| Battery Backup Current | 2µA (max) at TA = -40°C to +85°C, VCC = 0V - minimizes drain on coin-cell or supercap sources. |
| Operating Temperature | -40°C to +85°C - fully specified for industrial and embedded equipment deployment. |
| Package | 2mm × 2mm, 8-pin μDFN - supports high-density PCB layouts with thermal pad for reliability. |
| Output Type | Active-low push-pull RESET and PFO - eliminates need for external pull-up resistors. |
Pinout & Package
MAX16039LLA44+T is housed in a thermally enhanced 2mm × 2mm, 8-pin μDFN package with exposed thermal pad (pin 8). The package supports reflow soldering per JEDEC J-STD-020 and is RoHS-compliant (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low when VCC < 4.38V, remains low ≥140ms after recovery. |
| 2 | PFI | Power-fail input; monitors external voltage divider; triggers PFO when voltage falls below 1.235V. |
| 3 | GND | Ground reference for all analog and digital functions; must be low-impedance connection. |
| 4 | MR | Not connected - MAX16039 does not include manual-reset input (absent per family table). |
| 5 | PFO | Active-low push-pull power-fail output; goes low when PFI < 1.235V or VCC < reset threshold. |
| 6 | VCC | Main supply input (1.2V–5.5V); powers internal circuitry and sources OUT during normal operation. |
| 7 | OUT | Switched output; sourced from VCC normally, automatically switches to BATT during brownout. |
| 8 | BATT | Backup battery input; connects to OUT via internal MOSFET when VCC < VTH and VBATT > VCC + 40mV. |
Key Features
| Feature | Design Value |
|---|---|
| Battery-On (BATTON) Indicator | Push-pull output that drives high exclusively during battery-backup mode - enables direct LED or transistor interface without external logic. |
| Low Quiescent Supply Current | 13µA typical at 2.8V - extends shelf life and runtime of backup power sources including CR2032 and supercaps. |
| Integrated Battery Switchover | Internal MOSFET with <4.6Ω on-resistance at 2.5V - delivers up to 200mA from VCC and sustains SRAM during VCC dropout. |
| Power-Fail Warning with Hysteresis | 1.235V PFI threshold with 1% hysteresis - provides noise-immune early warning before main reset assertion. |
| Reset Valid Down to 1.2V | Guaranteed RESET assertion even as VCC decays to 1.2V - ensures deterministic behavior during deep brownout. |
Applications
| POS Terminal Power Management | Industrial Controller Brownout Protection |
|---|---|
|
Use Scenario: Maintaining SRAM data integrity during AC power loss or battery swap in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Supervisory IC providing battery-backed OUT, BATTON status indication, and synchronized RESET/PFO signaling. Use Value: Prevents transaction data loss by guaranteeing >140ms reset hold time and seamless BATT-to-OUT switchover with <2µA backup current. |
Use Scenario: Ensuring safe shutdown and nonvolatile memory retention in programmable logic controllers during unstable mains supply. IC Role / Device Role / Timing Role: Voltage monitor and backup switcher that asserts RESET before critical rail collapse and activates BATTON for system-level fault reporting. Use Value: Enables deterministic fail-safe state capture using 4.38V reset threshold matched to 5V system rails and 1.235V PFI for auxiliary supply monitoring. |
| Set-Top Box Real-Time Clock Backup | Portable Medical Instrument Memory Retention |
|
Use Scenario: Preserving RTC and configuration registers during brief power interruptions in cable/satellite set-top boxes. IC Role / Device Role / Timing Role: Low-power supervisory IC delivering regulated backup power to RTC ICs and asserting timed RESET upon recovery. Use Value: Achieves <13µA operating current and 2µA battery mode draw - extends coin-cell life beyond 5 years while maintaining 140ms reset timing margin. |
Use Scenario: Securing patient parameter logs and calibration data in handheld diagnostic devices during battery replacement or low-voltage conditions. IC Role / Device Role / Timing Role: Battery switchover controller with BATTON output driving status LED and RESET coordinating microcontroller safe state entry. Use Value: Guarantees SRAM retention via sub-40mV switchover hysteresis and 4.38V reset threshold aligned with 3.3V logic rails - no external components required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16039PLA44+T | Same 4.38V reset threshold and 8-pin μDFN package, but features open-drain RESET and PFO outputs instead of push-pull. | Requires external pull-up resistors; suitable where wired-OR reset bus or level translation is needed. | Select MAX16039PLA44+T only if system design mandates open-drain reset signaling or shared reset bus topology. |
| MAX16035LLA44+T | Identical 4.38V reset threshold and package, but includes chip-enable gating (CEIN/CEOUT) and lacks BATTON output. | Used for RAM write-protection during brownout; not suitable for battery-status indication. | Choose MAX16035LLA44+T when CE signal control is required and BATTON functionality is unnecessary. |
Compared with MAX16039PLA44+T, the MAX16039LLA44+T eliminates external pull-ups via push-pull outputs; compared with MAX16035LLA44+T, it trades CE gating for dedicated BATTON status signaling - making it optimal for applications requiring visible battery-backup confirmation without added logic.
Availability
MAX16039LLA44+T is available at Aetrix Electronics and suitable for POS terminals, industrial controllers, set-top boxes, and portable medical instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX16039LLA44+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 emphasis on high-reliability, low-power solutions for industrial and embedded systems.
The MAX16033–MAX16040 product line delivers compact, low-quiescent-current supervisory circuits optimized for battery-backed memory retention and brownout resilience in space-constrained portable and industrial equipment.
FAQ
What is the exact reset threshold voltage of the MAX16039LLA44+T?
The MAX16039LLA44+T has a factory-trimmed reset threshold of 4.38V, with guaranteed limits of 4.25V (min) and 4.50V (max) over -40°C to +85°C. This value is fixed and cannot be adjusted; it is selected by the "A44" suffix per Maxim's ordering guide and matches standard 5V rail supervision requirements.
Does the MAX16039LLA44+T support manual reset functionality?
No, the MAX16039LLA44+T does not include a manual-reset (MR) input. Per the family pinout table and device selector guide, MR is only present on MAX16033/MAX16037 variants. The MAX16039LLA44+T relies solely on VCC monitoring, PFI detection, and automatic battery switchover for reset generation.
What is the function of the BATTON pin on the MAX16039LLA44+T?
The BATTON pin on the MAX16039LLA44+T is a push-pull output that drives high exclusively during battery-backup mode - i.e., when VCC falls below 4.38V and VBATT exceeds VCC by >40mV. It sinks 3.2mA at 0.4V saturation and can directly drive LEDs or base inputs of external pass transistors.
Can the MAX16039LLA44+T operate with a 1.2V supply voltage?
Yes, the MAX16039LLA44+T is fully specified to operate down to 1.2V on VCC. Its RESET output remains valid and asserted even as VCC decays to this level, ensuring deterministic microprocessor reset behavior during deep brownout conditions - a key feature confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.
What package type and dimensions does the MAX16039LLA44+T use?
The MAX16039LLA44+T uses a 2mm × 2mm, 8-pin μDFN package with exposed thermal pad (pin 8). It complies with JEDEC MO-229 standards, supports standard reflow profiles, and is lead(Pb)-free/RoHS-compliant as indicated by the "+" suffix in the part number.
MAX16039LLA44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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)
MAX16039LLA44+T FAQ
1.How can I place an order for MAX16039LLA44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16039LLA44+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 MAX16039LLA44+T reliable?
The price and inventory of MAX16039LLA44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16039LLA44+T is usually 5 days.
3.What payment methods are accepted for MAX16039LLA44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16039LLA44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16039LLA44+T?
MAX16039LLA44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16039LLA44+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 MAX16039LLA44+T?
For technical support, including MAX16039LLA44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16039LLA44+T requirements.
6.How does Aetrix verify that MAX16039LLA44+T is sourced from the original manufacturer or authorized distributors?
All MAX16039LLA44+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 MAX16039LLA44+T meets industry standards.
7.What is the process for return or replacement of MAX16039LLA44+T?
All MAX16039LLA44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16039LLA44+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 MAX16039LLA44+T part is unused and in its original packaging.
Return procedure for MAX16039LLA44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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