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Analog Devices Inc./Maxim Integrated MAX16039LLA29+T
- Part No.:
- MAX16039LLA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16039LLA29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,082
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Product details
Overview
The MAX16039LLA29+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 2.93V reset threshold. It monitors VCC (1.2V–5.5V), provides automatic switchover to backup battery during brownout, asserts reset for ≥140ms, and draws only 13µA quiescent current. Used in portable POS terminals and real-time clock backup circuits.
For engineers reviewing the MAX16039LLA29+T datasheet, MAX16039LLA29+T pinout, MAX16039LLA29+T application, or MAX16039LLA29+T equivalent, key selection criteria include its 2.93V factory-set reset threshold, BATTON push-pull output capability, 8-pin μDFN-8 package, -40°C to +85°C operation, and support for battery-backed SRAM retention without external logic.
Technical Context
The MAX16039LLA29+T implements a precision voltage-monitoring architecture with a 2.93V ±70mV reset threshold referenced to an internal bandgap. Its integrated MOSFET-based battery switchover circuit connects BATT to OUT when VCC falls below VTH and VBATT > VCC + 40mV, enabling seamless RAM backup with <1µA battery standby current at 25°C.
It features a dedicated push-pull BATTON output that drives high during battery-backup mode, with 3.2mA sink capability at 0.4V saturation. Unlike variants with watchdog or manual reset, MAX16039LLA29+T omits MR and WDI inputs-its functionality is strictly reset monitoring, power-fail warning via PFI/PFO, and battery status indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (factory-trimmed, ±70mV over -40°C to +85°C); ensures reliable reset assertion before 3.3V/2.5V µP brownout. |
| Reset Timeout Period | 140ms minimum; guarantees µP initialization completes before release from reset. |
| Supply Current | 13µA typical at VCC = 2.8V; enables multi-year battery life in always-on backup applications. |
| Battery Standby Current | 1µA at TA = +25°C, VBATT = 2.8V, VCC = 0V; minimizes primary battery drain during long-term storage. |
| Output Type | Active-low push-pull RESET and BATTON; eliminates need for external pull-up resistors on critical control lines. |
| Operating Temperature | -40°C to +85°C; qualified for industrial and extended-temperature embedded systems. |
| Package | 2mm × 2mm, 8-pin μDFN; supports high-density PCB layouts in space-constrained portable equipment. |
Pinout & Package
Package: 2mm × 2mm, 8-pin μDFN (exposed pad), RoHS-compliant, tape-and-reel (T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP reset input low during VCC brownout; remains asserted ≥140ms after VCC recovery. |
| 2 - PFI | Power-fail comparator input | Monitors auxiliary supply via resistor divider; triggers PFO when voltage falls below 1.235V. |
| 3 - GND | Ground reference | Common return for VCC, BATT, and signal paths; requires low-impedance connection to minimize noise coupling. |
| 4 - PFO | Active-low power-fail output | Pull-down interrupt to µP NMI line when PFI drops below threshold or VCC falls below VTH. |
| 5 - VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT until VCC drops below VTH. |
| 6 - OUT | Regulated output | Switches between VCC and BATT; delivers up to 200mA from VCC, or battery-backed current during brownout. |
| 7 - BATT | Backup battery input | Connects to 2.3V–5.5V battery; automatically engages when VCC < VTH and VBATT > VCC + 40mV. |
| 8 - BATTON | Battery-on status indicator | Push-pull high during battery backup; sinks 3.2mA at 0.4V for LED drive or external transistor base control. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.93V reset threshold | Eliminates external resistor network for 3.0V system monitoring; reduces BOM count and layout area. |
| Battery-on (BATTON) push-pull output | Provides unambiguous, low-impedance indication of backup mode-no pull-up required for status LEDs or logic-level interfacing. |
| 13µA quiescent supply current | Enables >10-year coin-cell lifetime in RTC backup applications with typical 20mAh CR2032 battery. |
| 40mV switchover hysteresis | Prevents oscillation during slow VCC ramp-down; ensures clean, single-event battery engagement without chatter. |
| 1.2V minimum operating voltage | Supports reset assertion even during deep brownout conditions where other supervisors fail to operate. |
Applications
| POS Terminal Battery Backup | Real-Time Clock (RTC) Hold-up |
|---|---|
Use Scenario: Maintaining SRAM and RTC state during AC power loss or battery swap in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brownout detection, automatic BATT-to-OUT switchover, and BATTON status flag. Use Value: Prevents transaction data loss and clock drift by sustaining power to timekeeping and memory circuits for >10 seconds using a 3V lithium coin cell. | Use Scenario: Preserving time-of-day and alarm registers in embedded microcontrollers during main power interruption. IC Role / Device Role / Timing Role: Reset generator and battery switchover controller with precise 2.93V threshold aligned to 3.0V RTC supply rails. Use Value: Guarantees uninterrupted RTC operation with <1µA battery drain in backup mode-enabling multi-year calendar accuracy without maintenance. |
| Industrial Controller Brownout Protection | Set-Top Box Memory Retention |
Use Scenario: Protecting configuration EEPROM and volatile registers in programmable logic controllers exposed to unstable 24VDC field power. IC Role / Device Role / Timing Role: Power supervisor asserting reset and enabling backup path when input rail sags below 2.93V due to load transients. Use Value: Avoids firmware corruption and state machine lockup by enforcing controlled µP reset and maintaining SRAM contents during 100ms–500ms dips. | Use Scenario: Retaining channel lineup and parental control settings in consumer set-top boxes during brief AC outages. IC Role / Device Role / Timing Role: Battery-backed power manager delivering regulated OUT from BATT while signaling status via BATTON. Use Value: Enables instant resume without re-scan or setup after power restoration-critical for user experience in broadcast devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16039PLA29+T | Same 2.93V threshold and 8-pin μDFN, but open-drain RESET and PFO outputs instead of push-pull. | Requires external pull-ups; suitable where wired-OR reset bus or level translation is needed. | Select when system design mandates open-drain reset arbitration or compatibility with legacy µP reset inputs requiring pull-up. |
| TPS3808G33DBVR | 3.3V fixed reset threshold, SOT-23-6 package, 2.5µA IQ, no BATTON output or battery switchover function. | Only provides reset supervision-no backup power management or status indication. | Choose for cost-sensitive, non-battery-backed applications where only basic 3.3V reset is required and board space allows SOT-23. |
Compared with MAX16039PLA29+T, the MAX16039LLA29+T offers lower system component count due to push-pull outputs eliminating pull-ups; versus TPS3808G33DBVR, it adds critical battery switchover and BATTON status-making it uniquely suited for SRAM/RTC hold-up designs.
Availability
MAX16039LLA29+T is available at Aetrix Electronics and suitable for portable POS terminals, real-time clock backup systems, and industrial controller brownout protection requiring stable component supply and long-lifecycle availability.
Supply support for MAX16039LLA29+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 applications.
The MAX16033–MAX16040 family was engineered specifically for low-power battery-backed memory retention and µP supervision in space-constrained portable and embedded systems-emphasizing ultra-low IQ, small μDFN packaging, and integrated switchover logic.
FAQ
What is the factory-set reset threshold voltage for the MAX16039LLA29+T?
The MAX16039LLA29+T has a factory-trimmed reset threshold of 2.93V, with guaranteed tolerance of ±70mV over the full -40°C to +85°C temperature range. This value is laser-trimmed during production and does not require external resistor configuration-making it ideal for 3.0V system monitoring where precision and simplicity are critical. The '29' in the part number explicitly denotes this 2.93V threshold.
Does the MAX16039LLA29+T support battery switchover, and what is its battery standby current?
Yes, the MAX16039LLA29+T supports automatic battery switchover: when VCC falls below 2.93V and VBATT exceeds VCC by at least 40mV, it seamlessly connects BATT to OUT. In battery-backup mode with VCC = 0V and VBATT = 2.8V, the MAX16039LLA29+T draws only 1µA at +25°C-enabling multi-year operation from standard coin cells. This ultra-low standby current is confirmed in the Electrical Characteristics table under "Supply Current in Battery Backup Mode".
What is the function of the BATTON pin on the MAX16039LLA29+T, and how is it driven?
The BATTON pin on the MAX16039LLA29+T is a push-pull output that drives high exclusively during battery-backup mode-i.e., when VCC is below the 2.93V reset threshold and VBATT is active. It sinks 3.2mA at 0.4V saturation voltage and can source ~10µA from OUT in backup mode. Unlike open-drain alternatives, BATTON requires no external pull-up, simplifying interface to LEDs, optocouplers, or external pass transistors for higher-current backup paths.
Can the MAX16039LLA29+T be used without a backup battery?
Yes, the MAX16039LLA29+T operates normally without a backup battery: connect BATT to GND and tie OUT directly to VCC. In this configuration, it functions as a standalone reset supervisor with 2.93V threshold, active-low push-pull RESET, and PFI/PFO power-fail monitoring-retaining all core supervision features while disabling battery switchover and BATTON assertion. This mode is explicitly supported in the Applications Information section of the datasheet.
What package type and dimensions does the MAX16039LLA29+T use?
The MAX16039LLA29+T uses a 2mm × 2mm, 8-pin μDFN package with exposed thermal pad (pin count and footprint match the "8 µDFN-8" designation in the Selector Guide). It is RoHS-compliant (denoted by the '+' in the part number) and supplied in tape-and-reel format (denoted by 'T'). This compact, thermally efficient package supports high-density layouts in portable and battery-powered equipment where board space is constrained.
MAX16039LLA29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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)
MAX16039LLA29+T FAQ
1.How can I place an order for MAX16039LLA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16039LLA29+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 MAX16039LLA29+T reliable?
The price and inventory of MAX16039LLA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16039LLA29+T is usually 5 days.
3.What payment methods are accepted for MAX16039LLA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16039LLA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16039LLA29+T?
MAX16039LLA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16039LLA29+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 MAX16039LLA29+T?
For technical support, including MAX16039LLA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16039LLA29+T requirements.
6.How does Aetrix verify that MAX16039LLA29+T is sourced from the original manufacturer or authorized distributors?
All MAX16039LLA29+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 MAX16039LLA29+T meets industry standards.
7.What is the process for return or replacement of MAX16039LLA29+T?
All MAX16039LLA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16039LLA29+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 MAX16039LLA29+T part is unused and in its original packaging.
Return procedure for MAX16039LLA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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