My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX16039LLA31+
- Part No.:
- MAX16039LLA31+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16039LLA31+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,056
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX16039LLA31+ from Maxim Integrated is an 8-pin μDFN battery-backup supervisory IC for microprocessor systems, featuring a factory-set 3.08V reset threshold (L = push-pull), active-low battery-on (BATTON) output, and power-fail warning (PFI/PFO). It operates from 1.2V to 5.5V, draws only 13µA quiescent current, and supports reliable SRAM backup in portable POS terminals and industrial controllers.
For engineers reviewing the MAX16039LLA31+ datasheet, MAX16039LLA31+ pinout, MAX16039LLA31+ application, or MAX16039LLA31+ equivalent, key selection criteria include its 3.08V reset accuracy over -40°C to +85°C, 140ms minimum reset timeout, push-pull BATTON indicator, and integrated battery switchover with <2µA backup-mode supply current.
Technical Context
The MAX16039LLA31+ implements a precision voltage-monitoring architecture with independent comparators for VCC (3.08V threshold), PFI (1.235V reference), and RESETIN (1.235V reference). Its internal MOSFET-based battery switchover circuit connects BATT to OUT when VCC falls below VTH and VBATT > VCC + 40mV, ensuring seamless RAM retention during brownouts.
It integrates a dedicated push-pull BATTON output that asserts high exclusively in battery-backup mode, with 0.4V saturation at 3.2mA sink load. The device lacks watchdog or manual-reset inputs-confirmed by its 8-pin μDFN pinout and family functional matrix-and relies solely on VCC monitoring, PFI detection, and RESETIN for reset assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.00V (min), 3.08V (typ), 3.15V (max) - ensures reliable reset assertion for 3.3V/3.0V systems with ±2.6% tolerance over temperature |
| Reset Timeout Period | 140ms (min), 280ms (max) - guarantees sufficient processor initialization time after power recovery | Supply Current (VCC = 3.6V) | 16µA (typ), 35µA (max) - enables multi-year operation in battery-backed real-time clocks and memory retainers |
| Battery Backup Supply Current | 2µA (max, -40°C to +85°C) - minimizes drain on coin-cell batteries during extended power loss |
| BATTON Output Type | Active-high push-pull - drives LEDs or external pass transistors directly without pull-up resistors |
| Operating Temperature Range | -40°C to +85°C - qualified for industrial control, point-of-sale, and embedded computing environments |
| Package | 2mm × 2mm, 8-pin μDFN - enables ultra-compact PCB layout in space-constrained portable equipment |
Pinout & Package
MAX16039LLA31+ uses an 8-pin, 2mm × 2mm μDFN package with exposed pad (pin 8 = GND). Pin functions are validated per Maxim's official pin description table and family datasheet Figure 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low when VCC < 3.08V, remains low ≥140ms after VCC recovery |
| 2 | PFI | Power-fail input; referenced to 1.235V internal comparator; triggers PFO low when voltage drops below threshold |
| 3 | GND | Ground reference for all analog and digital circuitry; connects to exposed thermal pad |
| 4 | BATTON | Active-high battery-on indicator; driven high only during battery-backup mode to signal switchover status |
| 5 | PFO | Active-low power-fail output; open-drain compatible; asserts low on PFI threshold breach or VCC < reset threshold |
| 6 | VCC | Main supply input (1.2V–5.5V); powers internal circuitry and sources OUT during normal operation |
| 7 | OUT | Output rail; sourced from VCC when active, switches to BATT during backup; supports up to 200mA load |
| 8 | BATT | Backup battery input; automatically engages when VCC < VTH and VBATT > VCC + 40mV |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.08V reset threshold | ±2.6% accuracy over -40°C to +85°C eliminates need for external resistor dividers in 3.0V/3.3V systems |
| Push-pull BATTON output | Drives 3.2mA at 0.4V saturation; provides unambiguous, low-impedance battery-active status without external components |
| Ultra-low backup-mode current | 2µA max at full temperature range preserves coin-cell life for >10 years in RTC/SRAM applications |
| Integrated battery switchover with 40mV hysteresis | Prevents oscillation during slow VCC decay; ensures clean transition between main and backup supplies |
| Power-fail comparator with 1.235V reference | Enables monitoring of secondary rails (e.g., 5V, 12V) via external resistor divider without additional ICs |
Applications
| Portable POS Terminals | Industrial Controllers |
|---|---|
Use Scenario: Battery-backed memory retention during AC power interruption in retail payment terminals. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, automatic BATT-to-OUT switchover, and BATTON status indication. Use Value: Prevents transaction data loss by maintaining SRAM voltage within spec for >10 seconds using a CR2032 cell. |
Use Scenario: Reliable reset and power-fail warning in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: System-level supervisor asserting RESET on brownout and signaling PFO to PLC CPU before shutdown. Use Value: Enables controlled I/O state freeze and safe shutdown sequence via PFO interrupt, avoiding hardware damage. |
| Real-Time Clock Modules | Set-Top Box Memory Backup |
Use Scenario: Continuous timekeeping during main power loss in consumer STB RTC circuits. IC Role / Device Role / Timing Role: Low-quiescent-current supervisor managing coin-cell backup and asserting BATTON to enable clock IC sleep mode. Use Value: Achieves <2µA system standby current, extending CR1220 battery life beyond 5 years at +25°C. |
Use Scenario: Preserving channel lineup and user settings in cable/satellite receivers during brief outages. IC Role / Device Role / Timing Role: Dual-rail monitor detecting both 3.3V core and 1.2V I/O supply failures via PFI and VCC inputs. Use Value: Guarantees zero configuration loss by triggering immediate save-to-flash upon first PFI alert, before VCC collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16039PLA31+ | Same 3.08V reset threshold and 8-pin μDFN, but open-drain PFO and RESET outputs instead of push-pull | Requires external pull-up resistors on RESET/PFO; less suitable for direct MCU reset input without level-shifting | Select when interfacing with legacy MCUs requiring open-drain reset assertion or shared bus signaling |
| MAX6369LUT+T | 3.08V reset threshold, SOT23-6 package, no BATTON output, no PFI/PFO, 20µA typical ICC | Lacks battery switchover and power-fail warning; limited to basic reset-only applications | Choose only if BATTON status indication and auxiliary power monitoring are unnecessary and board space permits SOT23 |
Compared with MAX16039PLA31+, the MAX16039LLA31+ offers simpler interface via push-pull outputs; compared with MAX6369LUT+T, it delivers full battery-backup functionality and dual-voltage monitoring at the cost of two extra pins and slightly higher complexity.
Availability
MAX16039LLA31+ is available at Aetrix Electronics and suitable for portable POS terminals, industrial controllers, and real-time clock modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX16039LLA31+ 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 management, sensing, and interface applications across industrial, computing, and communications markets.
The MAX16033–MAX16040 family was engineered specifically for low-power, space-constrained microprocessor systems needing integrated battery backup, reset supervision, and power-fail warning in sub-2mm² packages.
FAQ
What is the exact reset threshold voltage of the MAX16039LLA31+?
The MAX16039LLA31+ has a factory-set reset threshold of 3.00V (minimum), 3.08V (typical), and 3.15V (maximum) over the full -40°C to +85°C operating range. This 3.08V nominal value is laser-trimmed during production and applies specifically to the "A31" suffix variant, making it ideal for 3.0V and 3.3V microprocessor supply monitoring without external calibration.
Does the MAX16039LLA31+ support manual reset or watchdog functionality?
No, the MAX16039LLA31+ does not include manual reset (MR) or watchdog timer (WDI) inputs. Per Maxim's functional matrix and pin configuration table, only the 10-pin variants (e.g., MAX16033–MAX16036) support MR, while MAX16034/MAX16038 support WDI. The MAX16039LLA31+ is an 8-pin device dedicated to VCC monitoring, battery switchover, BATTON indication, and PFI/PFO functions.
How does the BATTON output behave in the MAX16039LLA31+?
The BATTON output of the MAX16039LLA31+ is an active-high push-pull driver that asserts high *only* when the device is in battery-backup mode - i.e., when VCC falls below the 3.08V reset threshold *and* VBATT exceeds VCC by at least 40mV. It sinks 3.2mA at 0.4V saturation and sources ~10µA from OUT in backup mode, enabling direct LED drive or base biasing of external PNP pass transistors.
What is the maximum load current supported by the OUT pin of the MAX16039LLA31+?
The OUT pin of the MAX16039LLA31+ supports up to 200mA when sourced from VCC under normal operation. In battery-backup mode, the internal MOSFET connects BATT to OUT with on-resistance ranging from 3.1Ω (at VCC = 4.75V) to 4.6Ω (at VCC = 2.5V), limiting practical continuous current to ~100mA depending on battery voltage and thermal conditions - sufficient for powering SRAM, RTCs, and small logic banks.
Can the MAX16039LLA31+ monitor a secondary power rail like +5V or +12V?
Yes, the MAX16039LLA31+ can monitor secondary rails using its PFI input, which references a precise 1.235V internal comparator. By connecting an external resistor divider from the target rail (e.g., +5V) to PFI and GND, the trip point is set by VTH = 1.235V × (R1/R2 + 1). For example, a 5V rail trips PFO at 5.0V when R1/R2 = 3.05; the PFO output then signals the event to the host processor as a power-fail interrupt.
MAX16039LLA31+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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+ FAQ
1.How can I place an order for MAX16039LLA31+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16039LLA31+ 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+ reliable?
The price and inventory of MAX16039LLA31+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16039LLA31+ is usually 5 days.
3.What payment methods are accepted for MAX16039LLA31+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16039LLA31+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16039LLA31+?
MAX16039LLA31+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16039LLA31+ 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+?
For technical support, including MAX16039LLA31+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16039LLA31+ requirements.
6.How does Aetrix verify that MAX16039LLA31+ is sourced from the original manufacturer or authorized distributors?
All MAX16039LLA31+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX16039LLA31+?
All MAX16039LLA31+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16039LLA31+, 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+ part is unused and in its original packaging.
Return procedure for MAX16039LLA31+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX16039LLA31+ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
