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Analog Devices Inc./Maxim Integrated MAX16038LLA29+
- Part No.:
- MAX16038LLA29+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16038LLA29+.pdf
- Description:
- POWER MANAGEMENT CIRCUIT, BICMOS
- Quantity:
- Payment:
- Shipping:
Inventory:813
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Product details
Overview
The MAX16038LLA29+ from Maxim Integrated is a low-power µP supervisory circuit with watchdog timer, battery switchover, and power-fail warning functions. It features a factory-set 2.93V reset threshold, 1.6s watchdog timeout, active-low open-drain RESET/PFO outputs, and operates from 1.2V to 5.5V supply. Designed for portable microprocessor systems requiring reliable brownout protection and SRAM backup, it delivers 13µA quiescent current and supports battery-backup mode down to 1.2V.
For engineers reviewing the MAX16038LLA29+ datasheet, MAX16038LLA29+ pinout, MAX16038LLA29+ application, or MAX16038LLA29+ equivalent, key selection criteria include its 8-pin µDFN package, watchdog input (WDI) interface, 2.93V reset threshold tolerance (±70mV), and compatibility with battery-backed CMOS RAM retention in POS terminals and industrial controllers.
Technical Context
The MAX16038LLA29+ integrates a precision voltage monitor, 1.6s watchdog timer with edge-triggered reset clearing, and a bidirectional power-path switch that automatically routes VCC or BATT to OUT based on voltage comparison and hysteresis. Its internal 1.235V reference enables accurate PFI and RESETIN monitoring.
It implements a debounced WDI input with 100ns minimum pulse width detection, provides active-low open-drain RESET and PFO outputs with 0.4V VOL at 1.6mA sink, and maintains reset assertion for ≥140ms after VCC recovery - all while consuming only 13µA typical supply current at 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±0.07V - ensures reliable reset assertion during 3.0V/3.3V rail brownouts |
| Watchdog Timeout | 1.6s ±0.65s - provides sufficient margin for firmware execution loops without false triggers |
| Supply Current | 13µA typical at 5.5V - enables multi-year operation on coin-cell batteries in backup mode |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration and flexible pull-up voltage selection |
| Operating Voltage | 1.2V to 5.5V - supports direct connection to Li-ion, alkaline, or supercap backup sources |
| Reset Timeout | 140ms minimum - meets µP reset hold-time requirements for stable initialization |
| Battery Switchover | 40mV hysteresis - prevents oscillation during slow VCC decay near VBATT crossing |
Pinout & Package
MAX16038LLA29+ is housed in a 2mm × 2mm, 8-pin µDFN package with exposed pad (L822-1), rated for -40°C to +85°C operation and lead-free assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low during VCC < 2.93V, WDI timeout, or power-fail; requires external pull-up |
| 2 GND | Ground reference | Primary return path for VCC, BATT, and all internal comparators |
| 3 PFI | Power-fail input | Monitors external voltage divider; trips PFO when VPFI < 1.235V |
| 4 PFO | Active-low open-drain power-fail output | Signals µP NMI or interrupt when monitored supply fails |
| 5 VCC | Main supply input | Provides operating power and reference for reset threshold and watchdog |
| 6 OUT | Switched output | Sources from VCC normally; switches to BATT during brownout (≥VBATT +40mV) |
| 7 BATT | Backup battery input | Connects to coin cell or supercap; supplies OUT when VCC drops below threshold |
| 8 WDI | Watchdog input | Edge-sensitive input; reset cleared on rising/falling edges; timeout if static >1.6s |
Key Features
| Feature | Design Value |
|---|---|
| Low-quiescent-current supervision | 13µA ICC enables >10-year coin-cell life in always-on backup mode |
| Factory-trimmed reset threshold | 2.93V ±70mV eliminates external resistor networks for 3.0V system monitoring |
| Watchdog with edge-triggered clear | WDI accepts 100ns pulses; prevents lockup from stuck firmware states |
| Automatic battery switchover | 40mV hysteresis and MOSFET-based switching ensure glitch-free SRAM retention |
| Power-fail comparator with PFO | 1.235V internal reference enables precise secondary supply monitoring via PFI divider |
Applications
| Portable Medical Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Battery-powered ECG device retaining real-time waveform buffer during AC power loss. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brownout detection, automatic BATT-to-OUT switchover, and WDI-driven firmware health check. Use Value: Ensures uninterrupted 30-second waveform capture using 3V coin cell, with 1.6s watchdog preventing corrupted data writes. | Use Scenario: DIN-rail mounted controller maintaining I/O state and configuration memory during 24VDC supply dips. IC Role / Device Role / Timing Role: Power supervisor asserting RESET and enabling CE gating to protect CMOS RAM during brownout. Use Value: Guarantees 140ms minimum reset hold time and prevents erroneous writes to nonvolatile registers during voltage transients. |
| Retail POS Terminal | Smart Energy Meter |
Use Scenario: Credit card terminal preserving transaction log and secure key storage during main power interruption. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 5V rail via internal threshold and secondary 3.3V rail via RESETIN input. Use Value: Simultaneous VCC and auxiliary supply monitoring ensures cryptographic keys remain intact across multiple power domains. | Use Scenario: Utility meter retaining time-of-use billing data and RTC during grid outages. IC Role / Device Role / Timing Role: Backup manager routing supercap energy to RTC/SRAM and signaling power failure via PFO to MCU. Use Value: 13µA quiescent current extends 1F supercap backup runtime to >72 hours; PFO enables early warning before full brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16038PLA29+ | Same silicon, identical electrical specs; differs only in tape-and-reel packaging (T suffix implied) | No functional difference; used interchangeably in production where reel format required | Select MAX16038PLA29+ for automated SMT placement; MAX16038LLA29+ suits manual prototyping or low-volume builds |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no watchdog timer, no battery switchover, 1.8–6V operation | Lacks WDI, BATT, and OUT switching - suitable only for basic reset generation, not backup management | Choose only if system requires simple 3.3V reset without battery support or watchdog functionality |
Compared with MAX16038LLA29+, MAX16038PLA29+ offers identical supervision performance in reel format, while TPS3808G33DBVR provides lower-cost reset-only capability but omits critical battery switchover and watchdog features essential for SRAM retention and firmware reliability.
Availability
MAX16038LLA29+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, retail POS terminals, and smart energy meters requiring stable component supply with long-term lifecycle support.
Supply support for MAX16038LLA29+ 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 in industrial, automotive, and computing markets.
The MAX16033–MAX16040 family was engineered specifically for µP-based systems needing integrated battery backup, watchdog supervision, and multi-rail monitoring in ultra-small packages - targeting space-constrained portable and embedded equipment.
FAQ
What is the exact reset threshold voltage of the MAX16038LLA29+?
The MAX16038LLA29+ has a factory-trimmed reset threshold of 2.93V, with guaranteed limits of 2.85V (min) and 3.00V (max) over temperature. This value is laser-trimmed during production and applies specifically to the LLA29+ variant, enabling precise supervision of 3.0V logic rails without external resistors.
Does the MAX16038LLA29+ support battery backup for SRAM retention?
Yes, the MAX16038LLA29+ provides automatic battery switchover: when VCC falls below 2.93V and VBATT exceeds VCC by ≥40mV, it disconnects VCC from OUT and connects BATT instead. This maintains power to external SRAM during brownout, with typical BATT standby current of 2µA at 2.8V.
How does the watchdog function work on the MAX16038LLA29+?
The MAX16038LLA29+ watchdog monitors the WDI pin and triggers a reset pulse if WDI remains static for >1.6s (typical). A rising or falling edge on WDI clears the timer. The reset pulse duration is ≥140ms, and the watchdog operates independently of VCC level as long as supply is within 1.2V–5.5V range.
What package type and dimensions does the MAX16038LLA29+ use?
The MAX16038LLA29+ uses an 8-pin µDFN package (code L822-1), measuring 2.0mm × 2.0mm × 0.5mm with an exposed thermal pad. It is RoHS-compliant and lead-free, qualified for operation from -40°C to +85°C, and compatible with standard reflow soldering profiles.
Can the MAX16038LLA29+ monitor a secondary power supply?
No - the MAX16038LLA29+ lacks RESETIN and CEIN/CEOUT pins (present only in MAX16036/MAX16040 and MAX16033–MAX16036 variants). It supports only primary VCC supervision, PFI-based power-fail detection, and WDI-based watchdog; auxiliary supply monitoring requires MAX16036LLA29+ or MAX16040PLA29+.
MAX16038LLA29+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Bulk
- 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)
MAX16038LLA29+ FAQ
1.How can I place an order for MAX16038LLA29+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16038LLA29+ 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 MAX16038LLA29+ reliable?
The price and inventory of MAX16038LLA29+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16038LLA29+ is usually 5 days.
3.What payment methods are accepted for MAX16038LLA29+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16038LLA29+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16038LLA29+?
MAX16038LLA29+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16038LLA29+ 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 MAX16038LLA29+?
For technical support, including MAX16038LLA29+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16038LLA29+ requirements.
6.How does Aetrix verify that MAX16038LLA29+ is sourced from the original manufacturer or authorized distributors?
All MAX16038LLA29+ 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 MAX16038LLA29+ meets industry standards.
7.What is the process for return or replacement of MAX16038LLA29+?
All MAX16038LLA29+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16038LLA29+, 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 MAX16038LLA29+ part is unused and in its original packaging.
Return procedure for MAX16038LLA29+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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