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Analog Devices Inc./Maxim Integrated MAX16037LLA29+T
- Part No.:
- MAX16037LLA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16037LLA29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,173
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Product details
Overview
The MAX16037LLA29+T from Maxim Integrated is an 8-pin μDFN low-power microprocessor supervisory circuit with manual-reset input, power-fail comparator, active-low push-pull reset output, and battery switchover functionality. It features a factory-set 2.93V reset threshold, 140ms minimum reset timeout, 13μA quiescent current, and operates from 1.2V to 5.5V supply. It is used in portable equipment for reliable SRAM backup during brownout.
For engineers reviewing the MAX16037LLA29+T datasheet, MAX16037LLA29+T pinout, MAX16037LLA29+T application, or MAX16037LLA29+T equivalent, key selection criteria include reset threshold accuracy (±70mV), battery switchover hysteresis (40mV), MR debounced timing (120ns delay), and guaranteed operation across –40°C to +85°C.
Technical Context
The MAX16037LLA29+T integrates a precision voltage monitor with 2.93V ±0.07V threshold, a debounced manual-reset input with internal 20kΩ pullup, and a dedicated power-fail comparator referenced to 1.235V with 1% hysteresis. Its battery switchover logic activates when VCC falls below both VTH and VBATT, with 40mV hysteresis to prevent oscillation during slow VCC decay.
It delivers active-low push-pull RESET with VOL ≤0.3V at 1.6mA sink, supports up to 200mA OUT sourcing from VCC, and maintains reset assertion for ≥140ms after VCC recovery. The device enters ultra-low-current battery-backup mode (<2μA at TA = +25°C) when VCC = 0V and VBATT = 2.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±0.07V - sets precise brownout detection point for 3.0V/3.3V systems |
| Reset Timeout Period | 140ms min - ensures μP completes full initialization before release |
| Supply Current | 13μA typ at VCC = 2.8V - enables multi-year battery life in backup mode |
| Operating Voltage Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and main rail monitoring |
| Output Type | Active-low push-pull RESET - eliminates external pullup and reduces BOM count |
| Battery Switchover Hysteresis | 40mV - prevents chattering during gradual VCC fall near VTH |
| MR Input Pullup | 20kΩ min - allows direct connection to momentary switch without external resistor |
Pinout & Package
Package: 2mm × 2mm, 8-pin μDFN (pin pitch = 0.5mm), exposed pad, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Asserts low during brownout, manual reset, or power fail; drives μP reset directly |
| 2 - PFI | Power-fail input | Monitors secondary supply via resistive divider; trips PFO when VPFI < 1.235V |
| 3 - GND | Ground reference | Common return for all analog/digital functions; ties to PCB thermal pad |
| 4 - MR | Manual-reset input | Debounced logic input; low pulse ≥1µs triggers reset; internal 20kΩ pullup to VCC |
| 5 - PFO | Active-low power-fail output | Push-pull output asserted when PFI falls below threshold or VCC < VTH |
| 6 - VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT during normal operation |
| 7 - OUT | Regulated output | Sources from VCC (≤200mA) or BATT (backup mode); connects to SRAM VCC |
| 8 - BATT | Battery backup input | Accepts 2.1V–5.5V; automatically engages when VCC < VTH and VCC < VBATT |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.93V with ±70mV tolerance over –40°C to +85°C - eliminates external resistor network |
| Integrated battery switchover MOSFET | On-resistance ≤4.6Ω at VBATT = 2.5V - minimizes voltage drop during backup |
| Debounced manual-reset input | 120ns MR-to-RESET propagation delay with built-in noise immunity - no external RC required |
| Independent power-fail comparator | 1.235V reference with 1% hysteresis - enables accurate monitoring of auxiliary rails |
| Ultra-low quiescent current | 13μA typical at VCC = 2.8V - extends coin-cell life in always-on backup applications |
Applications
| Portable Medical Sensors | Industrial Handheld Terminals |
|---|---|
Use Scenario: Battery-powered glucose meter retains real-time clock and calibration data during battery replacement. IC Role / Device Role / Timing Role: Supervisory IC provides seamless switchover from main Li-ion to coin-cell backup and asserts reset only during actual brownout. Use Value: Prevents data corruption in nonvolatile memory by maintaining stable VOUT and guaranteeing ≥140ms reset hold time. | Use Scenario: Ruggedized warehouse scanner operates on intermittent rechargeable pack; must retain firmware state across brief power interruptions. IC Role / Device Role / Timing Role: MAX16037LLA29+T monitors 3.3V rail, triggers reset on undervoltage, and gates CE signal to protect SRAM during brownout. Use Value: Eliminates need for external CE gating logic and reduces layout area by integrating chip-enable control with reset generation. |
| Point-of-Sale Receipt Printers | Smart Energy Meters |
Use Scenario: Thermal printer powered from USB or AC adapter experiences line sags during print head activation. IC Role / Device Role / Timing Role: Acts as primary supervisor: detects 3.3V rail sag via internal VTH, asserts RESET, and switches SRAM to backup battery. Use Value: Ensures transaction integrity by preventing partial writes to flash during voltage dips using deterministic 2.93V trip point. | Use Scenario: Meter retains time-of-use data and tamper logs during grid outage lasting minutes to hours. IC Role / Device Role / Timing Role: Provides dual-rail supervision: main 3.3V rail monitored by VTH, auxiliary 5V rail monitored via PFI divider. Use Value: Enables independent failure reporting - PFO signals early power degradation while RESET guards against execution errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16037PLA29+T | Same pinout and reset threshold, but open-drain RESET/PFO outputs | Requires external pullup resistors; suitable where wired-OR reset bus is needed | Select when system-level reset bus sharing or level translation is required |
| TPS3808G33DBVR | 3.3V fixed reset threshold, 350ms timeout, 2.5μA IQ, SOT-23-6 package | Lacks battery switchover, MR input, and PFI/PFO; simpler single-rail monitor | Choose for cost-sensitive, space-constrained designs without backup requirements |
Compared with MAX16037PLA29+T, the MAX16037LLA29+T eliminates external pullups and simplifies layout; versus TPS3808G33DBVR, it adds critical battery switchover and manual reset-essential for data-retentive portable systems.
Availability
MAX16037LLA29+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, and point-of-sale receipt printers requiring stable component supply and long-term lifecycle support.
Supply support for MAX16037LLA29+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, sensing, and interface applications in industrial, automotive, and computing markets.
The MAX16033–MAX16040 family targets compact, low-power μP supervision with integrated battery switchover-optimized for space-constrained portable and battery-backed systems needing high reliability across temperature extremes.
FAQ
What is the exact reset threshold voltage of the MAX16037LLA29+T?
The MAX16037LLA29+T has a factory-set reset threshold of 2.93V, with a guaranteed range of 2.85V to 3.00V over –40°C to +85°C. This value is laser-trimmed during production and specified in the Electrical Characteristics table under "Reset Threshold" for part numbers ending in "L_29". The threshold remains stable with ±0.3% variation over temperature.
Does the MAX16037LLA29+T support battery switchover, and what is the switchover hysteresis?
Yes, the MAX16037LLA29+T supports automatic battery switchover from VCC to BATT when VCC falls below both the reset threshold and VBATT. The switchover hysteresis is 40mV - meaning the device reverts to VCC only when VCC rises 40mV above VBATT. This prevents oscillation during slow VCC recovery and is inherent to the internal comparator design.
What is the function of the MR pin on the MAX16037LLA29+T, and does it require external components?
The MR pin on the MAX16037LLA29+T is a debounced manual-reset input that asserts RESET when pulled low. It includes an internal 20kΩ (min) pullup resistor to VCC, so no external pullup is needed. A normally open momentary switch from MR to GND suffices; external RC debounce is unnecessary due to built-in 100ns glitch immunity and 120ns propagation delay.
Can the MAX16037LLA29+T monitor a second power supply, and how is that implemented?
Yes, the MAX16037LLA29+T can monitor a second supply using the PFI pin. Connect a resistive divider from the auxiliary rail to PFI and ground, sized so that PFI reaches 1.235V when the monitored voltage hits the desired trip point. The internal 1.235V comparator then asserts PFO low - which can be tied to MR or used as a standalone interrupt. Input current is ≤100nA, enabling high-impedance dividers.
What package type and dimensions does the MAX16037LLA29+T use, and is thermal pad connection required?
The MAX16037LLA29+T uses a 2mm × 2mm, 8-pin μDFN package with 0.5mm pin pitch and an exposed thermal pad. The pad must be soldered to a PCB copper pour for thermal and electrical stability - it is internally connected to GND. Standard reflow profiles for lead-free μDFN apply, with peak temperature ≤260°C per JEDEC J-STD-020.
MAX16037LLA29+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)
MAX16037LLA29+T FAQ
1.How can I place an order for MAX16037LLA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16037LLA29+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 MAX16037LLA29+T reliable?
The price and inventory of MAX16037LLA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16037LLA29+T is usually 5 days.
3.What payment methods are accepted for MAX16037LLA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16037LLA29+T transactions.
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4.How is shipping managed for MAX16037LLA29+T?
MAX16037LLA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16037LLA29+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 MAX16037LLA29+T?
For technical support, including MAX16037LLA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16037LLA29+T requirements.
6.How does Aetrix verify that MAX16037LLA29+T is sourced from the original manufacturer or authorized distributors?
All MAX16037LLA29+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 MAX16037LLA29+T meets industry standards.
7.What is the process for return or replacement of MAX16037LLA29+T?
All MAX16037LLA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16037LLA29+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 MAX16037LLA29+T part is unused and in its original packaging.
Return procedure for MAX16037LLA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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