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Analog Devices Inc./Maxim Integrated MAX16034LLB44+
- Part No.:
- MAX16034LLB44+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN
- Datasheet:
-
MAX16034LLB44+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,915
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Product details
Overview
The MAX16034LLB44+ from Maxim Integrated is a low-power microprocessor supervisory circuit with watchdog timer, power-fail warning, and battery switchover functionality. It features a 4.38V factory-set reset threshold (L44), active-low push-pull RESET output, operates from 1.2V to 5.5V, draws only 13µA quiescent current, and is housed in a 10-pin 2mm × 2mm µDFN package. It is used in portable equipment to maintain SRAM data integrity during brownouts.
For engineers reviewing the MAX16034LLB44+ datasheet, MAX16034LLB44+ pinout, MAX16034LLB44+ application, or MAX16034LLB44+ equivalent, key selection criteria include its 1.6s watchdog timeout, 140ms minimum reset timeout, 1.235V PFI threshold, battery-on indicator capability (via BATTON in sibling variants), and compatibility with 3.3V/5V µP systems requiring robust power monitoring.
Technical Context
The MAX16034LLB44+ integrates a precision voltage monitor, a 1.6s watchdog timer with edge-triggered reset clearing, an independent power-fail comparator (1.235V threshold), and a VCC-to-OUT switch with <4.6Ω on-resistance. Its reset generator asserts active-low RESET for ≥140ms after VCC rises above 4.38V or after WDI timeout.
It supports battery backup mode when VCC falls below 4.38V and VBATT exceeds VCC by ≥40mV, enabling seamless switchover to BATT for OUT. The device uses internal 20kΩ pull-up on MR (not used in MAX16034), and includes debounced WDI input with 100ns minimum pulse width tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.38V (factory-trimmed L44 variant); ensures reliable reset assertion for 3.3V/5V systems during brownout |
| Watchdog Timeout Period | 1.65s (typical); provides sufficient margin for µP firmware execution loops without false triggers |
| Quiescent Supply Current | 13µA at VCC = 2.8V; enables multi-year battery life in always-on backup applications |
| Reset Timeout Period | 140ms (min); guarantees µP initialization completes before release from reset |
| VCC-to-OUT On-Resistance | 3.7Ω at VCC = 3.15V, IOUT = 65mA; limits voltage drop and power loss during main supply operation |
| Power-Fail Input Threshold | 1.235V (±50mV); allows precise monitoring of auxiliary rails via external resistor divider |
| Operating Temperature Range | -40°C to +85°C; qualified for industrial and extended commercial environments |
| Package | 10-pin µDFN (2mm × 2mm); enables high-density PCB layout in space-constrained portable designs |
Pinout & Package
MAX16034LLB44+ is packaged in a 10-pin, 2mm × 2mm µDFN with exposed pad (pin 10 = CEOUT). The package is RoHS-compliant and lead-free (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low during VCC undervoltage, WDI timeout, or power failure |
| 2 | CEIN | Chip-enable input; gated to CEOUT only when RESET is deasserted (MAX16034 supports this function) |
| 3 | PFI | Power-fail input; referenced to 1.235V internal comparator to generate early warning of supply collapse |
| 4 | GND | Ground reference for all analog and digital circuitry; must be low-impedance connection |
| 5 | WDI | Watchdog input; rising/falling edges clear internal timer; timeout triggers reset pulse |
| 6 | PFO | Active-low power-fail output; goes low when PFI < 1.235V or VCC < reset threshold |
| 7 | VCC | Main supply input (1.2V–5.5V); powers internal circuitry and sources OUT during normal operation |
| 8 | OUT | Output rail; sourced from VCC or BATT depending on switchover logic; supplies up to 200mA |
| 9 | BATT | Backup battery input; automatically engages when VCC < 4.38V and VBATT > VCC + 40mV |
| 10 | CEOUT | Chip-enable output; mirrors CEIN when RESET is inactive; pulled up to OUT when disconnected |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog Timer with Edge-Clearing Logic | Prevents spurious resets by clearing on any WDI transition - not just periodic toggling |
| Factory-Trimmed Reset Threshold (4.38V) | Eliminates external resistor network; ±0.13V accuracy over -40°C to +85°C ensures consistent brownout detection |
| Low 13µA Quiescent Current | Extends battery life in always-on backup mode; critical for long-term SRAM retention in portable devices |
| VCC-to-BATT Switchover with 40mV Hysteresis | Prevents oscillation during slow VCC decay; ensures clean, glitch-free transition to backup power |
| Independent Power-Fail Comparator | Enables early warning of secondary supply collapse without affecting primary reset timing or µP operation |
| Push-Pull RESET and PFO Outputs | Provides strong drive capability (20mA sink) without external pull-ups; simplifies interface to µP reset inputs |
Applications
| Portable Medical Monitors | Industrial PLC Controllers |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter retains real-time sensor data and configuration during AC power loss or battery swap. IC Role / Device Role / Timing Role: Supervisory IC monitors main VCC, triggers watchdog if firmware hangs, and switches OUT to BATT to sustain SRAM and RTC. Use Value: Prevents data corruption and system lockup; 140ms reset timeout ensures µP reinitializes fully before resuming measurement cycles. |
Use Scenario: Programmable logic controller maintains I/O state and program memory during factory line voltage sags or transient outages. IC Role / Device Role / Timing Role: Acts as power-integrity guardian: asserts RESET on VCC dip, signals PFO to host controller before shutdown, and gates CE to protect RAM writes. Use Value: Eliminates need for external RC reset circuits; 1.235V PFI threshold enables monitoring of isolated 24V DC bus via resistor divider. |
| Point-of-Sale Terminals | Set-Top Box Firmware Recovery |
Use Scenario: Retail terminal with flash storage and secure element must survive brief mains interruption without transaction rollback or credential loss. IC Role / Device Role / Timing Role: Provides dual-layer protection: WDI watches application processor activity, while VCC monitoring guards against power-supply faults. Use Value: 1.6s watchdog timeout aligns with typical POS boot sequence; 4.38V threshold matches 3.3V I/O rail tolerance. |
Use Scenario: Consumer STB recovers from corrupted firmware update by forcing hard reset when bootloader fails to toggle WDI. IC Role / Device Role / Timing Role: Watchdog-enforced reset supervisor ensures recovery path executes even if main CPU enters infinite loop during flash write. Use Value: Edge-triggered WDI clearing prevents false timeouts during interrupt latency spikes; push-pull RESET drives reset pin directly without pull-up resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16034PLB44+ | Same functionality and pinout, but open-drain RESET/PFO outputs instead of push-pull | Requires external pull-up resistors; better suited for wired-OR reset buses or level translation | Select when interfacing with multiple reset sources or mixed-voltage systems where open-drain flexibility is needed |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no watchdog or battery switchover; 1.8µA IQ, SOT-23-6 package | Lacks WDI, BATT, CE gating, and PFI; suitable only for basic reset-only applications | Choose only if design requires ultra-low IQ and no battery backup or watchdog - not a functional substitute |
Compared with MAX16034LLB44+, the MAX16034PLB44+ offers identical supervision logic but different output drive architecture, while TPS3808G33DBVR omits core MAX16034 features entirely - making it unsuitable for battery-backed or watchdog-critical systems.
Availability
MAX16034LLB44+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, point-of-sale terminals, and set-top box firmware recovery systems requiring stable component supply across production lifecycles.
Supply support for MAX16034LLB44+ 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 demanding industrial, computing, and communications applications.
The MAX16033–MAX16040 family was engineered specifically for µP-based systems needing integrated battery switchover, watchdog supervision, and power-fail warning in minimal footprint - targeting portable, POS, and embedded control markets.
FAQ
What is the factory-set reset threshold voltage for MAX16034LLB44+?
The MAX16034LLB44+ has a factory-trimmed reset threshold of 4.38V (L44 code), with guaranteed range 4.25V to 4.50V over temperature. This value is laser-trimmed during production and does not require external components. The threshold remains stable across the full -40°C to +85°C operating range, ensuring consistent brownout detection in 3.3V and 5V systems where MAX16034LLB44+ is deployed.
Does MAX16034LLB44+ include a watchdog timer, and how is it triggered?
Yes, MAX16034LLB44+ includes a watchdog timer with a typical timeout period of 1.65s. It is triggered when the WDI input remains static (high or low) beyond that interval. Any rising or falling edge on WDI clears the timer - no periodic toggling is required. The watchdog asserts RESET for the full 140ms+ reset timeout period, and the internal timer resets automatically whenever RESET is asserted or WDI transitions.
Can MAX16034LLB44+ operate with a 1.2V supply voltage?
Yes, MAX16034LLB44+ operates down to 1.2V on VCC, and its RESET output remains valid (active-low) even at that minimum supply. The device draws only 13µA at 2.8V and maintains full functionality including watchdog monitoring, power-fail comparison, and VCC-to-OUT switching. However, BATT switchover requires VBATT > VCC + 40mV, so 1.2V operation assumes compatible backup source voltage.
What is the role of the CEIN and CEOUT pins on MAX16034LLB44+?
On MAX16034LLB44+, CEIN and CEOUT implement chip-enable signal gating to prevent erroneous writes to CMOS RAM during power failure. When RESET is deasserted, CEIN passes through to CEOUT with ~2ns propagation delay. When RESET asserts, CEOUT is held high (if CEIN was high) or pulsed low for 1µs then held high - blocking invalid CE transitions. This function is fully supported in MAX16034LLB44+ per the family datasheet pin mapping.
How does MAX16034LLB44+ handle battery switchover, and what is the switchover threshold?
MAX16034LLB44+ switches OUT from VCC to BATT automatically when two conditions are met: VCC falls below the 4.38V reset threshold, and VBATT exceeds VCC by at least 40mV. This hysteresis prevents oscillation during slow VCC decay. In backup mode, OUT is sourced from BATT with typical on-resistance of ~4.6Ω at 2.5V, and battery supply current drops to ≤2µA (at -40°C to +85°C), preserving backup runtime.
MAX16034LLB44+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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:
- 10-µDFN (2x2)
MAX16034LLB44+ FAQ
1.How can I place an order for MAX16034LLB44+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16034LLB44+ 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 MAX16034LLB44+ reliable?
The price and inventory of MAX16034LLB44+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16034LLB44+ is usually 5 days.
3.What payment methods are accepted for MAX16034LLB44+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16034LLB44+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16034LLB44+?
MAX16034LLB44+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16034LLB44+ 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 MAX16034LLB44+?
For technical support, including MAX16034LLB44+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16034LLB44+ requirements.
6.How does Aetrix verify that MAX16034LLB44+ is sourced from the original manufacturer or authorized distributors?
All MAX16034LLB44+ 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 MAX16034LLB44+ meets industry standards.
7.What is the process for return or replacement of MAX16034LLB44+?
All MAX16034LLB44+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16034LLB44+, 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 MAX16034LLB44+ part is unused and in its original packaging.
Return procedure for MAX16034LLB44+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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