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Analog Devices Inc./Maxim Integrated MAX16040PLA29+
- Part No.:
- MAX16040PLA29+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16040PLA29+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,911
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Product details
Overview
The MAX16040PLA29+ from Maxim Integrated is an 8-pin μDFN battery-backup supervisory IC for microprocessor systems, featuring a factory-set 2.93V reset threshold, auxiliary RESETIN comparator (1.235V threshold), active-low push-pull RESET output, and integrated battery switchover with <4.6Ω VCC-to-OUT on-resistance at 2.5V. It operates from 1.2V to 5.5V supply and delivers reliable power-fail warning and brownout protection in portable POS terminals and industrial controllers.
For engineers reviewing the MAX16040PLA29+ datasheet, MAX16040PLA29+ pinout, MAX16040PLA29+ application, or MAX16040PLA29+ equivalent, key selection criteria include its 13µA quiescent current, 140ms minimum reset timeout, 1.235V auxiliary reset input threshold, and compatibility with 2.5V/3.0V/3.3V/5.0V supply monitoring in space-constrained embedded designs.
Technical Context
The MAX16040PLA29+ integrates a precision voltage monitor, auxiliary RESETIN comparator, power-fail detector (PFI/PFO), and battery switchover MOSFET control in a single 2mm × 2mm μDFN-8 package. Its internal 1.235V reference enables user-adjustable secondary supply monitoring via external resistor divider, while the push-pull RESET output asserts low down to 1.2V VCC.
This device belongs to the MAX16033–MAX16040 family of low-power supervisory circuits optimized for battery-backed SRAM retention. It lacks manual-reset (MR), watchdog (WDI), and chip-enable gating (CEIN/CEOUT) functions-features reserved for 10-pin variants-making it purpose-built for compact, cost-sensitive applications requiring only primary supply supervision and auxiliary reset input capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.85V (min) to 3.00V (max); factory-trimmed 2.93V typical ensures precise 3.0V supply monitoring without external components. |
| RESET Output Type | Active-low push-pull; drives low to ≤0.3V at 1.6mA, eliminating need for external pull-up and enabling direct µP reset assertion. |
| RESET Timeout Period | 140ms (min); guarantees sufficient reset hold time for full µP initialization after power recovery or RESETIN event. |
| RESETIN Threshold | 1.185V–1.285V; fixed internal 1.235V reference allows accurate monitoring of secondary supplies (e.g., 2.5V, 3.3V rails) using two external resistors. |
| Quiescent Supply Current | 13µA (typ) at 2.8V VCC; enables multi-year operation from coin-cell backup sources in always-on instrumentation. |
| VCC-to-OUT On-Resistance | 4.6Ω (max) at 2.5V VCC and 25mA load; minimizes voltage drop during main supply operation, preserving SRAM write margin. |
| Operating Temperature Range | -40°C to +85°C; fully specified across industrial temperature range for deployment in harsh environments like factory automation. |
Pinout & Package
Package: 2mm × 2mm, 8-pin μDFN (exposed pad), RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Push-pull driver asserts low when VCC < 2.93V, RESETIN < 1.235V, or during power-fail; holds low ≥140ms after recovery. |
| 2 - PFI | Power-fail input | Monitors external voltage divider; triggers PFO low when input falls below 1.235V, providing early warning of supply collapse. |
| 3 - GND | Ground reference | Common return path for all analog and digital circuitry; requires low-impedance connection to minimize noise coupling into comparators. |
| 4 - RESETIN | Auxiliary reset input | Accepts external voltage for secondary supply monitoring; asserts RESET when voltage drops below 1.235V with 1.5µs propagation delay. |
| 5 - PFO | Active-low power-fail output | Push-pull output goes low when PFI < 1.235V or VCC < reset threshold; provides interrupt signal to µP NMI or IRQ line. |
| 6 - VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT during normal operation; supports ultra-low-voltage µPs. |
| 7 - OUT | Regulated output | Switches between VCC and BATT based on voltage comparison; delivers up to 200mA to SRAM or real-time clock circuitry. |
| 8 - BATT | Backup battery input | Connects to coin cell or supercap; automatically engages when VCC falls below reset threshold and VBATT > VCC + 40mV. |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary RESETIN comparator | Enables independent monitoring of secondary power rails (e.g., 2.5V I/O supply) using only two external resistors-no additional IC required. |
| 13µA supply current | Reduces battery drain in backup mode to <2µA (VBATT = 2.8V, VCC = 0V), extending coin-cell life beyond 5 years in low-duty-cycle applications. |
| 140ms reset timeout | Guarantees µP reset pulse width exceeds minimum requirements of ARM Cortex-M, PIC, and MSP430 families for reliable boot sequencing. |
| 2mm × 2mm μDFN-8 package | Minimizes PCB area by >60% vs. SOIC-8 alternatives, enabling integration into handheld medical devices and compact IoT edge nodes. |
| 1.235V internal reference | Provides stable threshold for RESETIN and PFI comparators across -40°C to +85°C, eliminating drift-related false resets in thermal cycling environments. |
Applications
| Portable POS Terminals | Industrial Programmable Logic Controllers |
|---|---|
Use Scenario: Battery-backed memory retention during AC power loss or hot-swap battery replacement in retail payment terminals. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brownout detection, auxiliary RESETIN monitoring of 3.3V logic rail, and seamless BATT-to-OUT switchover. Use Value: Prevents transaction data corruption by asserting RESET before SRAM voltage drops below 2.7V and maintaining OUT from BATT at ≤4.6Ω on-resistance. |
Use Scenario: Ensuring deterministic restart after undervoltage events in factory-floor PLCs powered by unregulated 24V DC supplies. IC Role / Device Role / Timing Role: Primary supervisor for 5.0V system rail and secondary monitor for isolated 3.3V FPGA configuration supply via RESETIN. Use Value: Dual-threshold supervision eliminates need for discrete comparators, reducing BOM count while guaranteeing 140ms reset hold time for FPGA reconfiguration. |
| Smart Energy Meters | Medical Patient Monitors |
Use Scenario: Preserving metering calibration data and time-of-use logs during utility grid interruptions lasting seconds to minutes. IC Role / Device Role / Timing Role: Battery switchover controller and power-fail interrupt generator (PFO) tied to µP NMI pin for immediate firmware response. Use Value: 1.235V PFI threshold enables accurate detection of 12V supply sag using simple resistor divider, triggering log flush before VCC dropout. |
Use Scenario: Maintaining volatile settings and real-time clock operation during brief AC/DC adapter disconnection in bedside monitors. IC Role / Device Role / Timing Role: Low-quiescent-current (13µA) supervisor enabling >3-year CR2032 battery life in backup mode while supporting 1.2V–5.5V input flexibility. Use Value: Push-pull RESET eliminates external pull-up resistor, reducing component count and board space in Class II medical devices with strict creepage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16036PLA29+ | 10-pin μDFN package with CEIN/CEOUT chip-enable gating; identical 2.93V reset threshold and RESETIN functionality. | Required where µP CE signal must be gated during reset to prevent RAM corruption-e.g., in legacy 8051-based controllers with external SRAM. | Select MAX16036PLA29+ only if chip-enable signal isolation is needed; otherwise MAX16040PLA29+ saves PCB area and cost. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V fixed threshold), no RESETIN input, no battery switchover, SOT-23-6 package. | Suitable for basic 3.3V rail monitoring without auxiliary supply supervision or backup power management-e.g., in sensor nodes. | Choose TPS3808G33DBVR for cost-sensitive, non-battery-backed applications; MAX16040PLA29+ is mandatory for dual-rail monitoring + BATT support. |
Compared with MAX16036PLA29+, the MAX16040PLA29+ reduces footprint by 20% and removes unused CE gating circuitry, lowering system-level power consumption by 2µA. Versus TPS3808G33DBVR, it adds critical RESETIN and battery switchover capabilities essential for data-retentive industrial equipment.
Availability
MAX16040PLA29+ is available at Aetrix Electronics and suitable for portable POS terminals, industrial programmable logic controllers, smart energy meters, and medical patient monitors requiring stable component supply and long-term lifecycle support.
Supply support for MAX16040PLA29+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX16033–MAX16040 product line was designed specifically for space-constrained microprocessor systems needing integrated battery backup, precise supply monitoring, and auxiliary reset inputs-targeting portable instrumentation and industrial control.
FAQ
What is the factory-set reset threshold voltage for the MAX16040PLA29+?
The MAX16040PLA29+ has a factory-trimmed reset threshold voltage of 2.93V, with guaranteed limits of 2.85V (minimum) and 3.00V (maximum) across -40°C to +85°C. This value is laser-trimmed during production and does not require external resistor networks-enabling plug-and-play 3.0V supply supervision in the MAX16040PLA29+.
Does the MAX16040PLA29+ support battery switchover, and what is its on-resistance?
Yes, the MAX16040PLA29+ supports automatic battery switchover from VCC to BATT when VCC falls below the 2.93V reset threshold and VBATT exceeds VCC by 40mV. Its VCC-to-OUT on-resistance is 4.6Ω maximum at 2.5V VCC and 25mA load, ensuring minimal voltage drop during main supply operation in the MAX16040PLA29+.
What is the function of the RESETIN pin on the MAX16040PLA29+?
The RESETIN pin on the MAX16040PLA29+ is an auxiliary reset input that triggers the internal RESET output when its voltage falls below 1.235V. It uses an internal precision reference to monitor secondary supplies (e.g., 2.5V or 3.3V rails) via an external resistor divider-providing independent supervision capability not dependent on the main VCC rail in the MAX16040PLA29+.
What output type does the MAX16040PLA29+ RESET pin use?
The MAX16040PLA29+ features an active-low push-pull RESET output, meaning it actively drives low (≤0.3V at 1.6mA) and high (≥0.8×VCC) without requiring an external pull-up resistor. This simplifies µP interface design and improves noise immunity compared to open-drain alternatives in the MAX16040PLA29+.
How does the MAX16040PLA29+ handle power-fail detection?
The MAX16040PLA29+ uses its PFI pin to monitor an external voltage divider and asserts its push-pull PFO output low when the PFI voltage falls below 1.235V. PFO also goes low when VCC drops below the 2.93V reset threshold, providing dual-path power-fail signaling to the µP's NMI or IRQ input in the MAX16040PLA29+.
MAX16040PLA29+ 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:
- 2.93V
- Output:
- Open Drain or Open Collector
- 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)
MAX16040PLA29+ FAQ
1.How can I place an order for MAX16040PLA29+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16040PLA29+ 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 MAX16040PLA29+ reliable?
The price and inventory of MAX16040PLA29+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16040PLA29+ is usually 5 days.
3.What payment methods are accepted for MAX16040PLA29+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16040PLA29+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16040PLA29+?
MAX16040PLA29+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16040PLA29+ 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 MAX16040PLA29+?
For technical support, including MAX16040PLA29+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16040PLA29+ requirements.
6.How does Aetrix verify that MAX16040PLA29+ is sourced from the original manufacturer or authorized distributors?
All MAX16040PLA29+ 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 MAX16040PLA29+ meets industry standards.
7.What is the process for return or replacement of MAX16040PLA29+?
All MAX16040PLA29+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16040PLA29+, 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 MAX16040PLA29+ part is unused and in its original packaging.
Return procedure for MAX16040PLA29+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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