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Analog Devices Inc./Maxim Integrated MAX16039LLA23+T
- Part No.:
- MAX16039LLA23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16039LLA23+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,152
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Product details
Overview
The MAX16039LLA23+T from Maxim Integrated is an 8-pin μDFN battery-backup supervisory IC with active-low push-pull reset, battery-on (BATTON) indicator, and precision 2.32V reset threshold. It provides μP reset, backup-battery switchover, power-fail warning, and operates from 1.2V to 5.5V supply with 13μA quiescent current. Used in portable POS terminals and real-time clock backup circuits where reliable brownout detection and low-power SRAM retention are critical.
For engineers reviewing the MAX16039LLA23+T datasheet, MAX16039LLA23+T pinout, MAX16039LLA23+T application, or MAX16039LLA23+T equivalent, key selection criteria include its 2.32V factory-set reset threshold, BATTON push-pull output for battery-status indication, 140ms minimum reset timeout, -40°C to +85°C operation, and 2mm × 2mm 8-pin μDFN package with GND-exposed pad.
Technical Context
The MAX16039LLA23+T implements a precision bandgap-based reset generator with 2.32V ±0.06V threshold (VTH), validated across -40°C to +85°C. Its internal MOSFET enables automatic VCC-to-BATT switchover when VCC falls below VTH and VBATT exceeds VCC by ≥40mV, delivering up to 20mA from battery during backup mode.
It integrates a dedicated BATTON push-pull output that asserts high exclusively during battery-backup mode, with 0.4V VOL at 3.2mA sink load. The device includes a 1.235V PFI comparator for independent power-fail monitoring and supports manual-reset assertion via external logic - though MR is absent in this variant (MAX16039 lacks MR input per pin table).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.25V (min) to 2.38V (max) - ensures reliable reset assertion before 2.5V logic rails collapse |
| Reset Timeout Period | 140ms (min) - guarantees μP initialization completes before release from reset |
| Supply Current | 13µA (typ) at VCC = 2.8V - enables multi-year battery life in always-on backup applications |
| Battery Standby Current | 2µA (max) at -40°C to +85°C - minimizes self-discharge during long-term storage |
| Operating Voltage Range | 1.2V to 5.5V - supports direct interface with Li-ion, coin-cell, and supercap backup sources |
| Output Type | Active-low push-pull RESET and BATTON - eliminates need for external pull-up resistors |
| Package | 2mm × 2mm, 8-pin μDFN with exposed thermal pad - enables ultra-compact PCB layout in space-constrained devices |
Pinout & Package
MAX16039LLA23+T uses an 8-pin µDFN package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad (pin 8). Pin 1 is marked by dot; pin numbering follows standard counter-clockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low when VCC < 2.32V, remains low for ≥140ms after VCC recovery |
| 2 | PFI | Power-fail input; referenced to 1.235V internal comparator; triggers PFO when voltage falls below threshold |
| 3 | GND | Analog/digital ground reference; connects to exposed thermal pad for thermal and EMI performance |
| 4 | BATTON | Battery-on indicator; pushes high only during valid battery-backup mode (VCC < VTH and VBATT > VCC) |
| 5 | PFO | Active-low power-fail output; goes low when PFI < 1.235V or VCC < reset threshold |
| 6 | VCC | Main supply input; powers internal circuitry and sources OUT until VCC drops below reset threshold |
| 7 | OUT | Regulated output; sourced from VCC normally, switches to BATT during backup; supports ≤200mA load |
| 8 | BATT | Backup battery input; supplies OUT when VCC fails; requires ≥40mV headroom over VCC for clean switchover |
Key Features
| Feature | Design Value |
|---|---|
| Battery-switchover hysteresis | 40mV built-in VCC–VBATT differential prevents oscillation during slow brownout transitions |
| Reset propagation delay | <25µs on VCC falling edge - ensures rapid response to supply collapse without false triggering |
| Power-fail comparator accuracy | ±1% threshold tolerance (1.235V ±12mV) - enables precise secondary supply monitoring |
| Low-voltage reset validity | RESET remains functional down to VCC = 1.2V - supports ultra-low-voltage microcontroller operation |
| Transient immunity | Withstands VCC glitches as short as 100ns at 10V/ms slew rate - suppresses noise-induced resets |
Applications
| POS Terminal Battery Backup | Real-Time Clock (RTC) Hold-up |
|---|---|
Use Scenario: Maintains SRAM and RTC state during AC power loss or battery swap in retail point-of-sale systems. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, automatic BATT switchover, and BATTON status flag for firmware logging. Use Value: Prevents transaction data loss and clock drift using <1µA battery standby current and 2.32V reset threshold aligned with 2.5V logic rails. |
Use Scenario: Powers RTC and calendar registers during main supply interruption in industrial controllers and smart meters. IC Role / Device Role / Timing Role: Dual-role supervisor: generates reset signal for system initialization and routes backup power to RTC domain via OUT pin. Use Value: Enables >10-year coin-cell lifetime via 2µA max battery leakage and precise 2.32V trip point matching typical RTC supply requirements. |
| Portable Medical Monitor Memory Retention | Set-Top Box Configuration Storage |
Use Scenario: Preserves patient parameter history and calibration data in handheld diagnostic devices during battery replacement. IC Role / Device Role / Timing Role: Battery-backup controller asserting BATTON to enable firmware-controlled safe shutdown and memory freeze. Use Value: Guarantees data integrity with 140ms min reset timeout and push-pull BATTON output driving external hold-off circuitry. |
Use Scenario: Retains channel lineup, parental controls, and network credentials in consumer STBs during brief grid outages. IC Role / Device Role / Timing Role: Power supervisor managing SRAM backup path and generating early power-fail interrupt via PFO to trigger NVRAM save. Use Value: Achieves zero-config-loss operation using integrated PFI comparator (1.235V ref) and 4.6Ω max VCC-to-OUT on-resistance at 3.15V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16039PLA23+T | Open-drain RESET and PFO outputs; same 2.32V threshold, 8-pin μDFN | Requires external pull-ups; better suited for wired-OR reset bus architectures | Select when system-level reset signaling demands open-drain compatibility or shared reset lines |
| TPS3808G125DBVR | 2.5V reset threshold, SOT-23-6 package, 1.8µA IQ, no BATTON output | Lacks battery switchover and status indication; limited to basic reset-only use cases | Choose only if compact size and ultra-low IQ are prioritized over battery management features |
Compared with MAX16039LLA23+T, the MAX16039PLA23+T offers identical supervision functionality but requires external pull-ups due to open-drain outputs, while TPS3808G125DBVR sacrifices battery control and status signaling for smaller footprint and lower quiescent current - making it unsuitable for true backup applications.
Availability
MAX16039LLA23+T is available at Aetrix Electronics and suitable for portable POS equipment, real-time clock hold-up, and set-top box configuration storage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX16039LLA23+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 management, sensing, and connectivity in demanding industrial and portable applications.
The MAX16033–MAX16040 family targets low-power battery-backed microprocessor systems, delivering integrated reset, switchover, watchdog, and power-fail functions in miniature μDFN packages for space- and energy-constrained designs.
FAQ
What is the exact reset threshold voltage of the MAX16039LLA23+T?
The MAX16039LLA23+T has a factory-trimmed reset threshold of 2.32V, with guaranteed limits of 2.25V (minimum) and 2.38V (maximum) across -40°C to +85°C. This value is fixed and cannot be adjusted externally - it is defined by the "A23" suffix in the part number per Maxim's Selector Guide.
Does the MAX16039LLA23+T include a manual reset input (MR)?
No, the MAX16039LLA23+T does not include a manual reset input. Per the pin configuration table, MR is only present on MAX16033/MAX16037 variants. The MAX16039 belongs to the BATTON-enabled subgroup (MAX16035/MAX16039) and omits MR, WDI, CEIN, and RESETIN pins to fit all functionality into the 8-pin μDFN package.
How does the BATTON output behave in the MAX16039LLA23+T?
The BATTON output of the MAX16039LLA23+T is a push-pull driver that asserts high only when the device is in battery-backup mode - i.e., when VCC is below the 2.32V reset threshold and VBATT exceeds VCC by ≥40mV. It sinks 3.2mA at 0.4V saturation and sources ~10µA from OUT in backup mode, enabling direct LED indication or external transistor gating.
Can the MAX16039LLA23+T operate with a 1.2V supply?
Yes, the MAX16039LLA23+T is fully specified to operate from 1.2V to 5.5V. Its RESET output remains valid down to VCC = 1.2V, and quiescent current is 13µA typical at VCC = 2.8V. This enables direct compatibility with ultra-low-voltage microcontrollers and energy-harvesting systems where supply rails dip near 1.2V.
What is the maximum load current supported by the OUT pin of the MAX16039LLA23+T?
The OUT pin of the MAX16039LLA23+T supports up to 200mA when sourced from VCC under normal operation. In battery-backup mode, the internal MOSFET delivers current from BATT, with on-resistance ranging from 4.6Ω (at 2.5V, 25mA) to 3.1Ω (at 4.75V, 150mA). Short-circuit protection limits fault current duration to ≤5 seconds.
MAX16039LLA23+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:
- 2.32V
- 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)
MAX16039LLA23+T FAQ
1.How can I place an order for MAX16039LLA23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16039LLA23+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 MAX16039LLA23+T reliable?
The price and inventory of MAX16039LLA23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16039LLA23+T is usually 5 days.
3.What payment methods are accepted for MAX16039LLA23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16039LLA23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16039LLA23+T?
MAX16039LLA23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16039LLA23+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 MAX16039LLA23+T?
For technical support, including MAX16039LLA23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16039LLA23+T requirements.
6.How does Aetrix verify that MAX16039LLA23+T is sourced from the original manufacturer or authorized distributors?
All MAX16039LLA23+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 MAX16039LLA23+T meets industry standards.
7.What is the process for return or replacement of MAX16039LLA23+T?
All MAX16039LLA23+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16039LLA23+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 MAX16039LLA23+T part is unused and in its original packaging.
Return procedure for MAX16039LLA23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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