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Analog Devices Inc./Maxim Integrated MAX16038LLA29+T
- Part No.:
- MAX16038LLA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16038LLA29+T.pdf
- Description:
- IC BATTERY BACKUP 2.93V 8-UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,864
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Product details
Overview
The MAX16038LLA29+T from Maxim Integrated is an 8-pin μDFN low-power supervisory circuit with watchdog timer, active-low push-pull reset output, and 2.93V factory-set reset threshold. It monitors VCC (1.2V–5.5V), asserts reset during brownout or manual trigger, switches SRAM supply to backup battery when VCC drops below threshold, and delivers 1.6s watchdog timeout. Used in portable POS terminals and industrial controllers for reliable μP power sequencing.
For engineers reviewing the MAX16038LLA29+T datasheet, MAX16038LLA29+T pinout, MAX16038LLA29+T application, or MAX16038LLA29+T equivalent, key selection criteria include its 8-pin μDFN-8 package, 13µA quiescent current, 140ms minimum reset timeout, watchdog input (WDI) compatibility, and push-pull RESET/PFO outputs-critical for battery-backed SRAM retention and brownout immunity in space-constrained embedded systems.
Technical Context
The MAX16038LLA29+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 uses a precision 2.93V threshold (±7mV over -40°C to +85°C) and guarantees reset assertion down to 1.2V VCC.
It integrates a battery switchover MOSFET with <4.6Ω VCC-to-OUT on-resistance at 2.5V/25mA and <0.2V dropout in backup mode, plus independent power-fail comparator (1.235V PFI threshold, 4µs delay) that forces PFO low when VCC falls below reset threshold-ensuring coordinated fail-safe signaling without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (factory-trimmed, ±7mV max deviation over temp) - ensures precise brownout detection for 3.0V/3.3V systems |
| Watchdog Timeout | 1.65s typical (1.00–2.25s range) - provides robust software hang detection without excessive latency |
| Quiescent Current | 13µA at 2.8V VCC - enables multi-year battery life in always-on backup mode |
| Reset Timeout Period | 140ms minimum - meets μP power-up timing requirements for stable initialization |
| Operating Voltage | 1.2V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V rails without level-shifting |
| Package | 2mm × 2mm, 8-pin μDFN - fits high-density PCB layouts with thermal pad for 380.6mW dissipation |
| Temperature Range | -40°C to +85°C - qualified for industrial and extended commercial environments |
Pinout & Package
Package: 2mm × 2mm, 8-pin μDFN with exposed thermal pad (pin 1 marked by dot). RoHS-compliant, lead-free, tape-and-reel packaging (T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - drives μP reset pin directly; sinks 20mA, valid down to 1.2V VCC |
| 2 | GND | Ground reference - connects to PCB ground plane; shares thermal pad for heat dissipation |
| 3 | PFI | Power-fail input - monitors external voltage divider; trips at 1.235V with 1% hysteresis |
| 4 | WDI | Watchdog input - edge-sensitive; resets internal timer on rising/falling edges or ≥100ns pulses |
| 5 | VCC | Main supply input - powers device and sources OUT until VCC drops below 2.93V |
| 6 | OUT | SRAM power output - switches automatically between VCC and BATT; supports up to 200mA load |
| 7 | BATT | Backup battery input - supplies OUT when VCC < VTH and VCC < VBATT; 40mV hysteresis prevents chatter |
| 8 | PFO | Active-low push-pull power-fail output - signals early warning before reset; tied to μP NMI or interrupt |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog Timer | 1.65s nominal timeout with automatic clearing on WDI edges - eliminates need for external timer IC in firmware safety monitoring |
| Battery Switchover | Sub-0.2V dropout in backup mode with <4.6Ω on-resistance - preserves SRAM data integrity during 100ms–5s brownouts |
| Reset Output Structure | Push-pull RESET and PFO - removes need for external pull-up resistors, reducing BOM count and board area |
| Low-Power Operation | 13µA ICC at 2.8V, 2µA IBATT in backup - extends coin-cell life beyond 5 years in standby applications |
| Power-Fail Comparator | Dedicated 1.235V reference with 4µs propagation - enables early fault detection before VCC crosses reset threshold |
Applications
| POS Terminal Power Management | Industrial Controller Brownout Protection |
|---|---|
Use Scenario: Battery-backed memory retention during AC power loss or battery swap in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, watchdog supervision, and seamless BATT-to-OUT switchover within 1µs. Use Value: Prevents transaction data loss by maintaining SRAM voltage >2.0V for ≥2 seconds using 3V coin cell, enabled by 2.93V reset threshold and <4.6Ω switchover MOSFET. | Use Scenario: Ensuring deterministic reset and safe shutdown in programmable logic controllers during unstable 24V DC input. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 5V rail via VCC and auxiliary 24V rail via PFI divider, asserting RESET and PFO independently. Use Value: Guarantees 140ms minimum reset pulse and 1.65s watchdog timeout-meeting IEC 61131-2 response time requirements for SIL-2 functional safety. |
| Portable Medical Device Power Sequencing | Set-Top Box Real-Time Clock Backup |
Use Scenario: Maintaining RTC and configuration memory during lithium primary battery depletion in handheld diagnostic tools. IC Role / Device Role / Timing Role: Low-quiescent-current (13µA) supervisor enabling >3-year shelf life; BATTON not present, but PFO signals low-battery condition to host MCU. Use Value: 1.2V operating minimum allows operation down to single-cell LiFePO₄ end-of-discharge (2.5V), extending usable battery capacity by 18% vs. 2.7V alternatives. | Use Scenario: Preserving real-time clock accuracy and channel lineup during mains outage in consumer set-top boxes. IC Role / Device Role / Timing Role: Backup power manager switching 3.3V system rail to 3V backup battery; RESET holds SoC in reset until stable VCC returns. Use Value: Push-pull RESET eliminates external pull-up, reducing standby current by 5µA; 2.93V threshold aligns precisely with 3.0V RTC supply tolerance (±2.3%). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16034LLA29+T | 10-pin μDFN; includes CEIN/CEOUT chip-enable gating; lacks WDI pin | Designed for systems requiring CE signal protection during brownout; not pin-compatible | Select only if chip-enable gating is required and PCB layout accommodates 10-pin footprint |
| TPS3808G125DBVR | Single-channel supervisor; no watchdog or battery switchover; 1.25V reset threshold; SOT-23-6 | Targeted at basic reset-only applications; cannot replace battery-backup functionality | Use only for cost-sensitive, non-backup designs where watchdog and switchover are handled externally |
Compared with MAX16034LLA29+T and TPS3808G125DBVR, the MAX16038LLA29+T uniquely combines watchdog supervision, battery switchover, and push-pull outputs in an 8-pin μDFN-enabling compact, self-contained power management where space and feature integration are critical.
Availability
MAX16038LLA29+T is available at Aetrix Electronics and suitable for portable POS terminals, industrial controllers, medical handhelds, and set-top box RTC backup requiring stable component supply across automotive-grade temperature ranges and long-lifecycle production.
Supply support for MAX16038LLA29+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 management, sensing, and interface applications in industrial, computing, and communications markets.
The MAX16033–MAX16040 family targets ultra-low-power, space-constrained microprocessor supervisory functions-specifically integrating reset generation, watchdog timing, battery switchover, and power-fail warning into sub-2mm² packages for portable and battery-critical systems.
FAQ
What is the reset threshold voltage of the MAX16038LLA29+T and how is it trimmed?
The MAX16038LLA29+T has a factory-trimmed reset threshold of 2.93V (minimum 2.85V, maximum 3.00V at +25°C), with ±7mV tolerance over -40°C to +85°C. This value is laser-trimmed during production and is fixed for the LLA29 variant-no external resistor adjustment is possible. The '29' in the part number explicitly denotes this 2.93V threshold, confirmed in the Reset Threshold Ranges table of the datasheet.
Does the MAX16038LLA29+T support battery backup for SRAM, and what is its switchover behavior?
Yes, the MAX16038LLA29+T supports battery backup for SRAM via its OUT pin. When VCC falls below 2.93V and VBATT exceeds VCC by ≥40mV, the internal MOSFET switches OUT from VCC to BATT within 1µs. In backup mode, OUT delivers up to 20mA from a 2.5V battery with <0.15V dropout, and the device draws only 2µA from BATT-enabling multi-hour retention on standard coin cells. The MAX16038LLA29+T does not include BATTON output.
What watchdog timeout period does the MAX16038LLA29+T provide, and how is it triggered?
The MAX16038LLA29+T provides a watchdog timeout period of 1.65s typical (1.00–2.25s range), monitored at the WDI pin. A reset pulse is triggered if WDI remains continuously high or low beyond this period. The timer clears on any rising or falling edge (≥100ns wide) at WDI, allowing flexible firmware integration. This behavior is intrinsic to the MAX16038LLA29+T and does not require external components.
What are the output drive capabilities of the RESET and PFO pins on the MAX16038LLA29+T?
The MAX16038LLA29+T features active-low push-pull RESET and PFO outputs. RESET sinks 20mA at VOL ≤0.3V (ISINK = 1.6mA, VCC ≥2.1V) and remains valid down to 1.2V VCC. PFO exhibits identical drive strength and voltage specs. Neither output requires external pull-ups, simplifying design and reducing standby current. These characteristics are guaranteed for the MAX16038LLA29+T across its full -40°C to +85°C operating range.
Can the MAX16038LLA29+T monitor a secondary power rail, and if so, how?
No, the MAX16038LLA29+T does not include RESETIN or auxiliary adjustable-reset input-those features are exclusive to MAX16036/MAX16040 variants. However, it can monitor a secondary rail indirectly using the PFI input: connect a resistive divider from the secondary voltage to PFI, setting trip point at 1.235V. When the divided voltage falls below this, PFO asserts. This method is validated for the MAX16038LLA29+T and appears in the datasheet's Applications Information section.
MAX16038LLA29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µDFN (2x2)
MAX16038LLA29+T FAQ
1.How can I place an order for MAX16038LLA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16038LLA29+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 MAX16038LLA29+T reliable?
The price and inventory of MAX16038LLA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16038LLA29+T is usually 5 days.
3.What payment methods are accepted for MAX16038LLA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16038LLA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16038LLA29+T?
MAX16038LLA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16038LLA29+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 MAX16038LLA29+T?
For technical support, including MAX16038LLA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16038LLA29+T requirements.
6.How does Aetrix verify that MAX16038LLA29+T is sourced from the original manufacturer or authorized distributors?
All MAX16038LLA29+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 MAX16038LLA29+T meets industry standards.
7.What is the process for return or replacement of MAX16038LLA29+T?
All MAX16038LLA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16038LLA29+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 MAX16038LLA29+T part is unused and in its original packaging.
Return procedure for MAX16038LLA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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