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Analog Devices Inc./Maxim Integrated MAX16040PLA29+T
- Part No.:
- MAX16040PLA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16040PLA29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,371
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Product details
Overview
The MAX16040PLA29+T from Maxim Integrated is an 8-pin μDFN battery-backup supervisory IC for microprocessor systems, featuring auxiliary adjustable-reset input (RESETIN), active-low open-drain reset output, power-fail comparator with 1.235V threshold, 140ms minimum reset timeout, and 13µA quiescent supply current. It operates from 1.2V to 5.5V and supports battery switchover when VCC falls below 2.93V and VBATT exceeds VCC by 40mV - used in portable POS terminals and real-time clock backup circuits.
For engineers reviewing the MAX16040PLA29+T datasheet, MAX16040PLA29+T pinout, MAX16040PLA29+T application, or MAX16040PLA29+T equivalent, key selection criteria include its factory-set 2.93V reset threshold (L29 suffix), 8-pin μDFN-8 package, RESETIN comparator for secondary supply monitoring, open-drain reset/PFO outputs, and -40°C to +85°C industrial temperature range.
Technical Context
The MAX16040PLA29+T implements a precision 1.235V internal reference for both PFI and RESETIN comparators, enabling independent monitoring of primary (VCC) and auxiliary (RESETIN) supplies. Its reset generator asserts active-low open-drain RESET for ≥140ms after VCC rises above 2.93V, MR deactivation, or RESETIN recovery - with propagation delay under 1.5µs from RESETIN to RESET.
It integrates a low-on-resistance battery switchover MOSFET (RON ≤ 4.6Ω at 2.5V VCC, 25mA) and supports true battery-backup mode where OUT connects to BATT only when VCC < VTH and VCC < VBATT − 40mV. The device draws just 2µA battery standby current at -40°C to +85°C with VCC = 0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.93V (factory-set L29 code), ±7mV tolerance over -40°C to +85°C - ensures reliable brownout detection for 3.0V/3.3V systems. |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and level-shifting with external pull-up to any voltage ≤ 6V. |
| RESET Timeout Period | 140ms (min), 280ms (max) - guarantees sufficient processor initialization time after power recovery. |
| Quiescent Supply Current | 13µA (typ) at VCC = 2.8V - enables multi-year operation on coin-cell batteries in RTC/SRAM backup applications. |
| RESETIN Threshold | 1.235V (±50mV), 25nA max input current - supports accurate monitoring of secondary supplies via external resistor divider. |
| Battery Standby Current | 2µA (max) over -40°C to +85°C with VCC = 0V - minimizes battery drain during extended backup-only operation. |
| Operating Temperature | -40°C to +85°C - fully specified for industrial and embedded equipment environments. |
Pinout & Package
Package: 2mm × 2mm, 8-pin μDFN (pin pitch 0.5mm), exposed pad, RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Asserts low during VCC undervoltage, RESETIN fault, or power-fail; requires external pull-up for logic-level compatibility. |
| 2 - PFI | Power-fail input | Monitors external supply via resistor divider; trips PFO when voltage falls below 1.235V. |
| 3 - GND | Ground reference | Primary return path for VCC, BATT, and all internal circuitry; must be low-impedance connection. |
| 4 - MR | Manual-reset input | Not present on MAX16040 - pin 4 is no-connect (NC) per MAX16037–MAX16040 8-pin mapping. |
| 5 - PFO | Active-low open-drain power-fail output | Drives low when PFI < 1.235V or VCC < reset threshold; shares open-drain structure with RESET. |
| 6 - VCC | Main supply input | Accepts 1.2V to 5.5V; powers internal circuitry and sources OUT during normal operation. |
| 7 - OUT | Regulated output | Sources from VCC normally; switches to BATT during backup mode (VCC < VTH and VCC < VBATT − 40mV). |
| 8 - BATT | Backup battery input | Connects to coin cell or supercap; supplies OUT only during brownout; supports up to 40mA continuous. |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary RESETIN comparator | 1.235V precision reference enables monitoring of secondary supplies (e.g., 2.5V I/O rail) with <25nA input bias. |
| Open-drain RESET/PFO outputs | Supports flexible interface to multiple voltage domains and enables shared interrupt lines without contention. |
| Battery switchover hysteresis | 40mV built-in hysteresis prevents oscillation during slow VCC fall/rise transitions near reset threshold. |
| Ultra-low battery standby current | 2µA max over full temperature range preserves battery life in long-term backup applications (e.g., RTC + SRAM). |
| Industrial temperature grade | Fully specified from -40°C to +85°C - suitable for uncontrolled environments like point-of-sale terminals and industrial controllers. |
Applications
| POS Terminal Battery Backup | Real-Time Clock (RTC) Power Management |
|---|---|
Use Scenario: Maintains SRAM and RTC operation during AC power loss or battery replacement in retail POS systems. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, automatic BATT-to-OUT switchover, and RESET assertion to hold µP in reset until stable power resumes. Use Value: Prevents data corruption in transaction logs and clock registers during brownout; enables >10-year coin-cell lifetime due to 2µA battery standby current. |
Use Scenario: Powers RTC and backup SRAM in set-top boxes and smart meters during main supply interruption. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 3.3V system rail (VCC) and provides dedicated RESETIN input to track 1.8V RTC supply independently. Use Value: Ensures RTC continues timekeeping even if main SoC supply fails, while RESETIN prevents RTC register writes during auxiliary rail instability. |
| Industrial Controller Brownout Protection | Portable Medical Device Power Sequencing |
Use Scenario: Protects programmable logic controllers from erratic behavior during unstable 24VDC field power. IC Role / Device Role / Timing Role: Generates clean, 140ms-minimum reset pulse upon VCC dip below 2.93V; uses PFI to monitor unregulated DC input for early power-fail warning. Use Value: Eliminates need for discrete RC reset circuits and external comparators - reduces BOM count and improves timing accuracy across temperature. |
Use Scenario: Manages power sequencing in handheld diagnostic tools with dual Li-ion cells and ultra-low-power MCU. IC Role / Device Role / Timing Role: Coordinates VCC startup, battery switchover, and controlled reset release using RESETIN to validate analog sensor supply stability before firmware execution. Use Value: Guarantees deterministic boot sequence and prevents sensor data corruption by delaying MCU wake-up until all critical rails are validated. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16036PLA29+T | 10-pin μDFN-10 package; includes CEIN/CEOUT chip-enable gating not present on MAX16040PLA29+T. | Required when µP CMOS RAM write protection during brownout is needed; adds 2 pins and layout complexity. | Select MAX16036PLA29+T only if CE gating functionality is required; otherwise MAX16040PLA29+T offers smaller footprint and lower cost. |
| TPS3808G33DBVR | TI part with 3.3V fixed reset threshold, push-pull RESET, no RESETIN input, and 1.8µA typical ICC. | Lacks auxiliary supply monitoring capability; suited for single-rail systems where RESETIN is unnecessary. | Choose TPS3808G33DBVR for cost-sensitive 3.3V-only applications without secondary supply monitoring; MAX16040PLA29+T is superior for multi-rail validation. |
Compared with MAX16036PLA29+T, the MAX16040PLA29+T saves board space with its 8-pin μDFN and removes unused CE gating logic; versus TPS3808G33DBVR, it adds critical RESETIN functionality for dual-supply validation but trades slightly higher quiescent current for greater design flexibility.
Availability
The MAX16040PLA29+T is available at Aetrix Electronics and suitable for portable POS terminals, real-time clock backup systems, industrial controllers, and portable medical devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX16040PLA29+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 high-performance analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, computing, and communications markets.
The MAX16033–MAX16040 family delivers integrated battery-backup supervision with precision voltage monitoring, low-power operation, and compact packaging - engineered specifically for space-constrained, battery-dependent µP systems requiring high reliability.
FAQ
What is the factory-set reset threshold voltage for the MAX16040PLA29+T?
The MAX16040PLA29+T has a factory-set reset threshold of 2.93V, indicated by the "L29" suffix in the part number. This value is guaranteed from 2.85V (min) to 3.00V (max) over the full -40°C to +85°C operating temperature range, making it ideal for monitoring 3.0V or 3.3V power rails with margin.
Does the MAX16040PLA29+T support battery switchover, and what are the switching conditions?
Yes, the MAX16040PLA29+T supports automatic battery switchover. It connects OUT to BATT only when both conditions are met: VCC falls below the 2.93V reset threshold, and VCC is at least 40mV lower than VBATT. This hysteresis prevents chattering during slow voltage transitions and ensures clean power handoff to backup source.
What is the function of the RESETIN pin on the MAX16040PLA29+T, and how is it used?
The RESETIN pin on the MAX16040PLA29+T is an auxiliary comparator input referenced to a precise 1.235V internal voltage. When the voltage at RESETIN falls below 1.235V, the device asserts RESET. It is typically used with an external resistor divider to monitor a secondary supply (e.g., 2.5V I/O rail), enabling independent fault detection beyond the main VCC rail.
What package type and dimensions does the MAX16040PLA29+T use?
The MAX16040PLA29+T uses a 2mm × 2mm, 8-pin μDFN package with 0.5mm pin pitch and an exposed thermal pad. This compact RoHS-compliant package supports high-density PCB layouts and provides efficient thermal performance for battery-backed applications operating continuously at ambient temperatures up to +85°C.
How does the MAX16040PLA29+T handle power-fail detection, and what is the PFI threshold?
The MAX16040PLA29+T uses the PFI pin to monitor external supplies via a resistor divider. Its internal power-fail comparator triggers when the PFI voltage falls below 1.235V (±50mV), causing PFO to assert low. This provides early warning of impending power failure - independent of the main reset threshold - and can be configured to monitor any voltage rail using standard divider design equations.
MAX16040PLA29+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:
- 2.93V
- 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+T FAQ
1.How can I place an order for MAX16040PLA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16040PLA29+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 MAX16040PLA29+T reliable?
The price and inventory of MAX16040PLA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16040PLA29+T is usually 5 days.
3.What payment methods are accepted for MAX16040PLA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16040PLA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16040PLA29+T?
MAX16040PLA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16040PLA29+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 MAX16040PLA29+T?
For technical support, including MAX16040PLA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16040PLA29+T requirements.
6.How does Aetrix verify that MAX16040PLA29+T is sourced from the original manufacturer or authorized distributors?
All MAX16040PLA29+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 MAX16040PLA29+T meets industry standards.
7.What is the process for return or replacement of MAX16040PLA29+T?
All MAX16040PLA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16040PLA29+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 MAX16040PLA29+T part is unused and in its original packaging.
Return procedure for MAX16040PLA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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