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Analog Devices Inc./Maxim Integrated MAX16038LLA46+T
- Part No.:
- MAX16038LLA46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16038LLA46+T.pdf
- Description:
- IC BATTERY BACKUP 4.63V 8-UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,400
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Product details
Overview
The MAX16038LLA46+T from Maxim Integrated is an 8-pin μDFN battery-backup supervisory IC with watchdog timer, active-low push-pull reset output, and factory-set 4.63V reset threshold. It monitors VCC (1.2V–5.5V), asserts reset during brownout or manual trigger, switches OUT to BATT when VCC drops below VTH, and provides power-fail warning via PFI/PFO. Used in POS terminals and portable equipment for SRAM retention and μP reliability.
For engineers reviewing the MAX16038LLA46+T datasheet, MAX16038LLA46+T pinout, MAX16038LLA46+T application, or MAX16038LLA46+T equivalent, key selection criteria include its 1.6s watchdog timeout, 140ms minimum reset timeout, 13μA quiescent current, 8-pin 2mm×2mm μDFN package, and support for battery switchover down to 1.2V supply operation.
Technical Context
The MAX16038LLA46+T implements a dedicated watchdog timer with 1.00–2.25s timeout (typ 1.65s), triggered by WDI edge transitions or sustained high/low states. Its reset generator combines VCC monitoring, manual-reset input debouncing, and power-fail detection using a precision 1.235V internal reference for PFI and RESETIN comparators.
It integrates a low-on-resistance MOSFET switch (RON ≤ 4.6Ω at 2.5V) between BATT and OUT, enabling seamless backup switchover with 40mV hysteresis. The device operates across –40°C to +85°C and supports push-pull RESET and PFO outputs, eliminating external pull-up requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.63V (factory-set, ±0.12V tolerance); ensures reliable reset assertion for 5V systems during brownout. |
| Watchdog Timeout Period | 1.65s typical (1.00–2.25s min/max); provides robust software execution monitoring without false triggers. |
| Reset Timeout Period | 140ms minimum (280ms max); guarantees sufficient μP initialization time after VCC recovery. |
| Quiescent Supply Current | 13μA typical at 2.8V; enables ultra-low-power operation in battery-backed memory retention. |
| Battery Backup Current | 1μA at +25°C (2μA over –40°C to +85°C); minimizes battery drain during extended backup mode. |
| VCC-to-OUT On-Resistance | 3.1Ω at 4.75V, 150mA load; limits voltage drop and power loss during main supply operation. |
| Operating Temperature Range | –40°C to +85°C; qualified for industrial and commercial embedded applications without derating. |
Pinout & Package
MAX16038LLA46+T uses an 8-pin, 2mm × 2mm μDFN package with wettable flanks, RoHS-compliant and lead-free. Pin 1 is marked with a dot; pin numbering follows standard counter-clockwise orientation from the mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Asserts low during VCC < 4.63V, WDI timeout, or MR low; holds low ≥140ms after recovery; drives μP reset directly without pull-up. |
| 2 - PFI | Power-fail input comparator | Monitors external voltage divider; asserts PFO when VPFI falls below 1.235V (±1%); enables early power-fail warning. |
| 3 - GND | Ground reference | Common return path for all analog and digital circuitry; must be low-impedance connection to minimize noise coupling. |
| 4 - WDI | Watchdog timer input | Edge-sensitive input; clears internal timer on rising/falling edges; timeout occurs if static >1.65s; supports TTL/CMOS logic levels. |
| 5 - PFO | Active-low push-pull power-fail output | Drives low when PFI < 1.235V or VCC < 4.63V; provides interrupt signal to μP NMI or GPIO without external components. |
| 6 - VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT during normal operation; tolerates –0.3V to +6V transient. |
| 7 - OUT | Regulated output supply | Sources from VCC when valid; switches to BATT during backup; delivers up to 200mA; used for SRAM or real-time clock backup. |
| 8 - BATT | Backup battery input | Accepts 2.1V–5.5V; connects to OUT via internal MOSFET when VCC < VTH and VCC < VBATT; 40mV hysteresis prevents chatter. |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer with 1.6s timeout | Enables fail-safe μP recovery without software intervention; resets on WDI stall longer than 1.65s. |
| Push-pull RESET and PFO outputs | Eliminates need for external pull-up resistors; reduces BOM count and board space in compact designs. |
| 13μA supply current at 2.8V | Extends battery life in always-on backup applications; supports multi-year operation on coin cells. |
| 40mV switchover hysteresis | Prevents oscillation during slow VCC ramp-down; ensures clean, single-event transition from VCC to BATT. |
| 1.2V minimum operating voltage | Allows reset assertion and functional operation even as VCC collapses near LDO dropout, improving brownout immunity. |
| –40°C to +85°C full-spec operation | Guarantees timing accuracy and electrical performance across industrial temperature range without derating. |
Applications
| POS Terminal Power Management | Portable Medical Device Backup |
|---|---|
|
Use Scenario: Maintains SRAM data during AC power loss or battery swap in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, battery switchover, and watchdog reset to preserve transaction logs and configuration. Use Value: Prevents data corruption during brownout; 140ms reset timeout ensures μP completes safe shutdown before backup activation. |
Use Scenario: Retains real-time clock and calibration settings in handheld ECG monitors during primary battery replacement. IC Role / Device Role / Timing Role: Battery-backup controller asserting RESET only during actual fault, not during brief insertion transients. Use Value: 1.2V operational floor and 1μA backup current enable >5-year coin-cell life; 40mV hysteresis avoids false switchover. |
| Industrial PLC I/O Module | Set-Top Box Firmware Protection |
|
Use Scenario: Secures configuration registers and last-state memory in programmable logic controller modules exposed to voltage sags. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 3.3V I/O rail via PFI and guards main 5V μP supply via VCC threshold. Use Value: Independent PFI comparator (1.235V ref) allows precise secondary rail monitoring without additional components. |
Use Scenario: Protects bootloader integrity and channel lineup data in consumer set-top boxes during unstable wall-adapter operation. IC Role / Device Role / Timing Role: Watchdog-enforced firmware supervision: WDI toggled by boot ROM; failure triggers hard reset before corrupted code executes. Use Value: 1.65s watchdog timeout balances responsiveness and noise immunity; push-pull PFO simplifies NMI routing on dense PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16034LLA46+T | 10-pin μDFN; includes CEIN/CEOUT chip-enable gating; no BATTON or RESETIN; same 4.63V reset, 1.6s watchdog. | Required where μP CE signal must be gated during reset to prevent RAM write errors; adds 2 pins and layout area. | Select MAX16034LLA46+T only if CEIN/CEOUT functionality is needed; otherwise MAX16038LLA46+T offers smaller footprint and identical core supervision. |
| TPS3808G33DBVR | Single-channel supervisor (no watchdog, no battery switchover); 3.3V fixed reset threshold; SOT-23-6 package; 1.8μA IQ. | Only suitable for basic power-monitoring tasks; cannot replace MAX16038LLA46+T in battery-backup or watchdog-critical systems. | Choose TPS3808G33DBVR for cost-sensitive, non-backup applications requiring only 3.3V reset; not a functional substitute for MAX16038LLA46+T. |
Compared with MAX16034LLA46+T, the MAX16038LLA46+T saves board space with its 8-pin μDFN and omits unused CE gating-ideal for compact POS or medical devices. Versus TPS3808G33DBVR, it delivers integrated battery switchover and watchdog functionality essential for data-retentive systems, justifying its higher integration level.
Availability
MAX16038LLA46+T is available at Aetrix Electronics and suitable for POS terminals, portable medical instruments, industrial PLC modules, and set-top boxes requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for MAX16038LLA46+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 targets ultra-low-power battery-backed memory supervision in space-constrained systems, integrating reset, watchdog, power-fail detection, and switchover control in sub-4mm² packages.
FAQ
What is the factory-set reset threshold voltage for MAX16038LLA46+T?
The MAX16038LLA46+T has a factory-set reset threshold voltage of 4.63V (minimum 4.50V, maximum 4.75V). This value is laser-trimmed during production and applies across the full –40°C to +85°C operating range with tight tolerance, making it suitable for reliable 5V system supervision without external resistor networks.
Does MAX16038LLA46+T support battery switchover, and what is the switchover hysteresis?
Yes, MAX16038LLA46+T supports automatic battery switchover: when VCC falls below 4.63V and VCC is less than VBATT, OUT switches from VCC to BATT. The switchover uses 40mV hysteresis to prevent oscillation during slow VCC decay-ensuring a single, clean transition without repeated switching near the threshold.
What is the watchdog timeout period for MAX16038LLA46+T, and how is it cleared?
The MAX16038LLA46+T watchdog timeout period is 1.65s typical (1.00–2.25s min/max). It is cleared on any rising or falling edge at the WDI pin-or automatically when RESET is asserted. If WDI remains static beyond the timeout, a reset pulse is generated for ≥140ms, ensuring μP recovery from software lockup.
Can MAX16038LLA46+T operate with supply voltages below 2.0V?
Yes, MAX16038LLA46+T operates down to 1.2V on VCC. Its reset output remains valid (active-low push-pull) and functional even as VCC collapses to 1.2V, and its 13μA quiescent current is specified down to this voltage-enabling robust brownout detection and graceful shutdown in low-voltage systems.
What package type and dimensions does MAX16038LLA46+T use?
MAX16038LLA46+T uses an 8-pin, 2mm × 2mm μDFN package with wettable flanks and RoHS-compliant lead-free finish. The package height is 0.5mm max, and pin pitch is 0.5mm-optimized for high-density PCB layouts in portable and industrial equipment where space and thermal performance are critical.
MAX16038LLA46+T 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:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µDFN (2x2)
MAX16038LLA46+T FAQ
1.How can I place an order for MAX16038LLA46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16038LLA46+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 MAX16038LLA46+T reliable?
The price and inventory of MAX16038LLA46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16038LLA46+T is usually 5 days.
3.What payment methods are accepted for MAX16038LLA46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16038LLA46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16038LLA46+T?
MAX16038LLA46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16038LLA46+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 MAX16038LLA46+T?
For technical support, including MAX16038LLA46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16038LLA46+T requirements.
6.How does Aetrix verify that MAX16038LLA46+T is sourced from the original manufacturer or authorized distributors?
All MAX16038LLA46+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 MAX16038LLA46+T meets industry standards.
7.What is the process for return or replacement of MAX16038LLA46+T?
All MAX16038LLA46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16038LLA46+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 MAX16038LLA46+T part is unused and in its original packaging.
Return procedure for MAX16038LLA46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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