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Analog Devices Inc./Maxim Integrated MAX16039LLA31+T
- Part No.:
- MAX16039LLA31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16039LLA31+T.pdf
- Description:
- IC BATTERY BACKUP 3.08V 8-UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
The MAX16039LLA31+T from Maxim Integrated is a low-power, 8-pin μDFN supervisory circuit designed for battery-backed SRAM retention and microprocessor reset control in portable and industrial systems. It features a factory-set 3.08V reset threshold (L = push-pull RESET), battery-on indicator (BATTON), power-fail comparator (PFI/PFO), and operates from 1.2V to 5.5V with 13µA quiescent current. It is used in POS terminals and critical μP power monitoring where reliable switchover to backup power is required.
For engineers reviewing the MAX16039LLA31+T datasheet, MAX16039LLA31+T pinout, MAX16039LLA31+T application, or MAX16039LLA31+T equivalent, key selection criteria include its 3.08V reset threshold accuracy, active-low push-pull RESET output, BATTON high-indication during battery-backup mode, -40°C to +85°C operation, and 2mm × 2mm μDFN-8 package compatibility with space-constrained designs.
Technical Context
The MAX16039LLA31+T implements a precision voltage-monitoring architecture with a dedicated 1.235V internal reference for both PFI and RESETIN comparators. Its reset generator enforces a minimum 140ms timeout after VCC recovery, and its integrated MOSFET-based switchover path delivers up to 200mA from VCC or BATT with <4.6Ω on-resistance at 2.5V.
As the BATTON-enabled variant in the MAX16035–MAX16039 subset, it provides a push-pull high-active output signaling battery-backup mode, distinct from watchdog or manual-reset variants. It lacks CEIN/CEOUT and WDI functionality, simplifying integration in applications requiring only reset supervision and battery status indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00V to 3.15V (factory-set L_A31 code); ensures reliable reset assertion before 3.3V µP brownout. |
| RESET Output Type | Active-low push-pull; drives low without external pull-up, supports direct µP reset input connection. |
| BATTON Function | Push-pull high-active output; asserts logic-high when VCC < VTH and BATT > VCC + 40mV, enabling LED/status flag use. |
| Quiescent Current | 13µA typical at VCC = 2.8V; enables multi-year battery life in always-on backup applications. |
| Operating Voltage Range | 1.2V to 5.5V on VCC/BATT; supports single-cell Li-ion, coin-cell, and supercap backup sources. |
| Package | 2mm × 2mm, 8-pin μDFN; surface-mount footprint compatible with automated assembly and thermal constraints. |
| Temperature Range | -40°C to +85°C; qualified for industrial and extended commercial environments. |
Pinout & Package
Package: 2mm × 2mm, 8-pin μDFN (pin pitch = 0.5mm), exposed pad for thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low reset output | Push-pull driver; asserts low during VCC undervoltage, battery switchover, or PFI fault; holds low ≥140ms after VCC recovery. |
| 2 (PFI) | Power-fail input | Monitors external supply via resistor divider; trips PFO when voltage falls below 1.235V ±1%. |
| 3 (GND) | Ground reference | Common return for all analog and digital functions; must be low-impedance connection to system ground plane. |
| 4 (MR) | Manual-reset input | Debounced TTL/CMOS-compatible input; low pulse ≥1µs asserts RESET; internal 20kΩ pullup to VCC. |
| 5 (PFO) | Active-low power-fail output | Push-pull output; goes low when PFI < 1.235V or VCC < reset threshold; signals µP NMI or interrupt line. |
| 6 (VCC) | Main supply input | Primary power source (1.2V–5.5V); powers internal circuitry and supplies OUT until switchover to BATT. |
| 7 (OUT) | Regulated output | Delivers power to SRAM or peripheral; sourced from VCC normally, switches to BATT when VCC < VTH and BATT > VCC + 40mV. |
| 8 (BATT) | Battery backup input | Accepts 0V–6V backup source; internal MOSFET connects BATT to OUT during brownout; draws ≤2µA standby current. |
Key Features
| Feature | Design Value |
|---|---|
| Battery-on status indicator | BATTON push-pull output provides unambiguous high-level signal during backup mode-no external logic or pull-up needed. |
| Low-voltage operation | Functional down to 1.2V VCC enables use with single-cell LiFePO₄ or NiMH batteries without boost converters. |
| Independent power-fail detection | Dedicated PFI comparator with 1.235V reference allows monitoring of secondary rails (e.g., 5V, 12V) using simple resistor dividers. |
| Reset timeout stability | 140ms minimum tRP with <±5% variation over -40°C to +85°C ensures consistent µP initialization timing across temperature. |
| Transient-immune reset generation | Immunity to short VCC glitches (<25µs at 10V/ms overdrive) prevents spurious resets in noisy power environments. |
Applications
| POS Terminal Power Supervision | Industrial Controller Brownout Protection |
|---|---|
Use Scenario: Battery-backed memory retention during AC power loss or main supply interruption in point-of-sale terminals. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, automatic BATT switchover to SRAM, and BATTON-driven LED status indicator. Use Value: Guarantees zero-data-loss SRAM hold with ≤2µA battery drain and immediate visual confirmation of backup activation. | Use Scenario: Maintaining real-time clock and configuration memory during transient brownouts in programmable logic controllers. IC Role / Device Role / Timing Role: Reset supervisor asserting clean µP reset and holding SRAM supply via OUT while signaling backup mode via BATTON. Use Value: Eliminates need for discrete diode-OR and reset logic; reduces BOM count by 4 components and PCB area by >30%. |
| Set-Top Box Critical Memory Retention | Portable Medical Instrument Backup Power Control |
Use Scenario: Preserving channel lineup and user settings in cable/satellite receivers during brief power dips. IC Role / Device Role / Timing Role: Dual-role device: monitors 3.3V rail for reset, switches 2.5V SRAM supply to coin-cell backup, and lights status LED via BATTON. Use Value: Enables 10-year coin-cell life due to 13µA ICC and 1µA VBATT standby current; meets IEC 60601 leakage requirements. | Use Scenario: Ensuring uninterrupted operation of nonvolatile memory and RTC in handheld diagnostic devices during battery replacement. IC Role / Device Role / Timing Role: Provides glitch-free switchover between primary Li-ion and backup supercap, with BATTON confirming transition to backup mode. Use Value: Supports hot-swap battery replacement without system reset; 40mV switchover hysteresis prevents oscillation during slow VCC decay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16039PLA31+T | Same reset threshold and BATTON function, but open-drain RESET and PFO outputs require external pull-ups. | Suitable where µP reset input tolerates open-drain drive or where wired-OR reset bus is used. | Select for shared reset bus architectures or when lower output leakage (<1µA) is prioritized over drive strength. |
| MAX16035LLA31+T | Identical pinout and BATTON function, but lacks MR input-no manual reset capability. | Used in fully automated systems where external reset initiation is unnecessary. | Choose when board space is constrained and manual reset switch is omitted; otherwise, MAX16039LLA31+T provides full feature set. |
Compared with MAX16039PLA31+T, the MAX16039LLA31+T offers stronger reset drive and simpler µP interface; compared with MAX16035LLA31+T, it adds essential MR functionality for field service and diagnostics-making it the most versatile choice for general-purpose battery-backed supervision.
Availability
MAX16039LLA31+T is available at Aetrix Electronics and suitable for POS equipment, industrial controllers, and set-top boxes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX16039LLA31+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, mixed-signal, and power-management ICs for industrial, computing, and communications markets.
The MAX16033–MAX16040 family targets compact, low-power supervisory needs in battery-critical systems-delivering integrated reset, switchover, and status indication in sub-4mm² packages for portable and embedded applications.
FAQ
What is the exact reset threshold voltage of the MAX16039LLA31+T?
The MAX16039LLA31+T has a factory-trimmed reset threshold of 3.08V (min 3.00V, max 3.15V) at 25°C, with ±0.5% variation over -40°C to +85°C. This value is fixed by the "A31" suffix and applies to VCC falling edge detection; the device asserts RESET when VCC drops below this threshold and holds it active for ≥140ms after VCC rises above it. The MAX16039LLA31+T uses an internal bandgap reference ensuring stability across voltage and temperature.
Does the MAX16039LLA31+T support battery switchover with supercapacitors?
Yes, the MAX16039LLA31+T fully supports supercapacitor backup sources. Its BATT input accepts voltages up to 6V and its internal MOSFET switchover circuit engages when VCC falls below the 3.08V threshold and VBATT exceeds VCC by 40mV. Supercaps can be connected directly to BATT with no series diode required, and the device draws only ≤2µA from the supercap in backup mode-enabling multi-hour hold-up times with common 0.47F units. The MAX16039LLA31+T's low 13µA quiescent current further extends backup duration.
How does the BATTON output behave in the MAX16039LLA31+T?
The BATTON output of the MAX16039LLA31+T is a push-pull, high-active signal that asserts logic-high only during valid battery-backup mode-i.e., when VCC is below the 3.08V reset threshold AND VBATT is at least 40mV greater than VCC. It sinks 3.2mA at 0.4V saturation and sources ~10µA from OUT in backup mode. Unlike open-drain alternatives, BATTON requires no external pull-up and can directly drive LEDs or optocouplers. It deasserts immediately when VCC recovers above threshold, providing precise, real-time status feedback for system firmware or UI indicators.
Can the MAX16039LLA31+T monitor a secondary power rail like +5V or +12V?
Yes, the MAX16039LLA31+T can monitor secondary rails using its PFI input. By connecting a resistor divider from the target rail to PFI and GND, the internal 1.235V comparator detects when the divided voltage falls below threshold-e.g., a 5V rail trips PFO when its voltage drops below ~5.05V (using R1/R2 = 3.08). The PFI input draws only ±100nA, minimizing divider loading error. PFO then asserts low to signal the event to µP NMI or interrupt lines. This capability is independent of the main VCC reset function and works concurrently with BATTON and RESET operations in the MAX16039LLA31+T.
What is the maximum continuous output current capability of the MAX16039LLA31+T's OUT pin?
The OUT pin of the MAX16039LLA31+T delivers up to 200mA when sourced from VCC under normal operation. In battery-backup mode, current delivery depends on BATT voltage and temperature: at VBATT = 2.5V and TA = 25°C, it sustains ≥5mA with ≤0.15V drop; at VBATT = 3.15V, it supports ≥10mA with ≤0.15V drop; and at VBATT = 4.5V, it handles ≥20mA with ≤0.2V drop. The internal MOSFET's on-resistance ranges from 3.1Ω (VCC = 4.75V) to 4.6Ω (VCC = 2.5V), and the device includes short-circuit protection limiting OUT fault current to safe levels for up to 5 seconds. This makes the MAX16039LLA31+T suitable for powering small SRAM banks or low-power peripherals.
MAX16039LLA31+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:
- 3.08V
- 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)
MAX16039LLA31+T FAQ
1.How can I place an order for MAX16039LLA31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16039LLA31+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 MAX16039LLA31+T reliable?
The price and inventory of MAX16039LLA31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16039LLA31+T is usually 5 days.
3.What payment methods are accepted for MAX16039LLA31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16039LLA31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16039LLA31+T?
MAX16039LLA31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16039LLA31+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 MAX16039LLA31+T?
For technical support, including MAX16039LLA31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16039LLA31+T requirements.
6.How does Aetrix verify that MAX16039LLA31+T is sourced from the original manufacturer or authorized distributors?
All MAX16039LLA31+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 MAX16039LLA31+T meets industry standards.
7.What is the process for return or replacement of MAX16039LLA31+T?
All MAX16039LLA31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16039LLA31+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 MAX16039LLA31+T part is unused and in its original packaging.
Return procedure for MAX16039LLA31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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