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Analog Devices Inc./Maxim Integrated MAX16037LLA44+T
- Part No.:
- MAX16037LLA44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16037LLA44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX16037LLA44+T from Maxim Integrated is an 8-pin μDFN low-power microprocessor supervisory circuit with manual-reset input, active-low push-pull reset output, and factory-set 4.38V reset threshold (VTH = 4.25V to 4.50V). It provides battery switchover, power-fail warning, and reset timeout ≥140ms, operating from 1.2V to 5.5V supply with only 13µA quiescent current - used in portable POS terminals and critical μP power monitoring where reliable brownout detection and SRAM backup are required.
For engineers reviewing the MAX16037LLA44+T datasheet, MAX16037LLA44+T pinout, MAX16037LLA44+T application, or MAX16037LLA44+T equivalent, key selection criteria include its 4.38V reset threshold accuracy over -40°C to +85°C, debounced MR input with internal 20kΩ pullup, push-pull RESET output capable of sinking 20mA, and integrated VCC-to-OUT MOSFET switch with 3.1Ω on-resistance at 4.75V.
Technical Context
The MAX16037LLA44+T implements a precision bandgap-based reset generator with ±1.5% threshold tolerance over temperature, coupled with a dedicated manual-reset input (MR) that asserts RESET for ≥140ms after MR release. Its internal power-fail comparator monitors PFI against a 1.235V reference and drives PFO low when VPFI falls below threshold.
This device integrates a low-impedance VCC-to-OUT pass element (RON = 3.1Ω @ 4.75V) and automatic battery switchover logic that engages when VCC drops below both VTH and VBATT by >40mV hysteresis - enabling seamless SRAM backup without external FETs or diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.38V (factory-set, min 4.25V / max 4.50V) - ensures reliable reset assertion before 5V system brownout. |
| Reset Timeout Period | ≥140ms - guarantees μP initialization completes before release from reset state. |
| Supply Current | 13µA typical at VCC = 2.8V - enables multi-year battery life in backup mode. |
| VCC-to-OUT On-Resistance | 3.1Ω at VCC = 4.75V, IOUT = 150mA - supports up to 200mA load from main supply with <0.5V dropout. |
| Operating Temperature Range | -40°C to +85°C - fully specified for industrial and portable equipment environments. |
| Reset Output Type | Active-low push-pull - eliminates need for external pullup resistor; drives RESET directly into μP input. |
| Manual-Reset Input | Debounced with 20kΩ internal pullup to VCC - accepts TTL/CMOS logic or momentary switch to GND without external RC. |
Pinout & Package
MAX16037LLA44+T is housed in a space-saving 2mm × 2mm, 8-pin μDFN package with exposed pad (EP), rated for -40°C to +85°C operation and RoHS-compliant (lead-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Asserts low during VCC undervoltage, MR activation, or power-fail; holds low ≥140ms after recovery. |
| 2 - PFI | Power-fail input | Monitors external voltage divider; triggers PFO when VPFI falls below 1.235V (±1% hysteresis). |
| 3 - GND | Ground reference | Common return for all analog and digital functions; connects to EP for thermal and electrical integrity. |
| 4 - MR | Manual-reset input | Logic-low assertion forces RESET; internal 20kΩ pullup eliminates external resistor requirement. |
| 5 - PFO | Active-low power-fail output | Drives low when VPFI < 1.235V or VCC < VTH; push-pull structure supports direct NMI connection. |
| 6 - VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and supplies OUT via integrated pass element. |
| 7 - OUT | Regulated output | Sources from VCC normally; switches to BATT during backup mode; delivers up to 200mA. |
| 8 - BATT | Backup-battery input | Connects to coin cell or supercap; engages automatically when VCC < VTH and VCC < VBATT – 40mV. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.38V (±1.5%) - eliminates external resistor network for 5V systems; reduces BOM count. |
| Integrated VCC-to-OUT pass switch | 3.1Ω RON at 4.75V - replaces discrete MOSFET + driver, saving PCB area and improving efficiency. |
| Debounced MR input | Internal 20kΩ pullup + noise immunity - enables direct switch-to-GND interface without external debounce components. |
| Low-quiescent-current backup mode | 1µA at TA = +25°C (VBATT = 2.8V, VCC = 0V) - extends battery life in always-on memory retention applications. |
| Power-fail comparator with hysteresis | 1.235V trip point + ~12mV hysteresis - rejects supply ripple and prevents chatter during slow VCC decay. |
Applications
| POS Terminal Power Monitoring | Industrial Microcontroller Backup |
|---|---|
|
Use Scenario: Battery-backed SRAM retention during AC power loss in retail point-of-sale terminals. IC Role / Device Role: Supervisory controller managing VCC/BATT switchover, asserting RESET during brownout, and signaling backup mode via PFO. Use Value: Prevents data corruption in transaction logs by guaranteeing clean reset and uninterrupted SRAM power down to 1.2V. |
Use Scenario: Maintaining real-time clock and configuration memory in programmable logic controllers during mains failure. IC Role / Device Role: Dual-role supervisor providing precise 4.38V reset threshold and automatic battery switchover to BATT pin. Use Value: Enables >10-year coin-cell lifetime due to 1µA backup current and eliminates need for external switchover FETs. |
| Portable Medical Device Power Sequencing | Set-Top Box Brownout Protection |
|
Use Scenario: Ensuring deterministic startup and safe shutdown in handheld diagnostic instruments powered by Li-ion batteries. IC Role / Device Role: Reset generator with MR input for user-initiated reboot and PFI monitoring of regulated 3.3V rail. Use Value: Guarantees μP enters known state before firmware execution begins, even during partial battery discharge. |
Use Scenario: Preventing corrupted firmware writes during unstable wall-adapter operation in consumer STB units. IC Role / Device Role: Power-fail detector driving PFO to μP NMI pin and holding RESET active until stable 5V rail resumes. Use Value: Eliminates boot-loop failures caused by marginal 5V supply; 140ms timeout exceeds typical regulator recovery time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16033LLA44+T | 10-pin μDFN; includes CEIN/CEOUT chip-enable gating function not present in MAX16037LLA44+T | Required where CMOS RAM write-protection during brownout is needed (e.g., industrial data loggers) | Select MAX16033LLA44+T only if CE gating is mandatory; otherwise MAX16037LLA44+T saves board space and cost. |
| TPS3808G33DBVR | Single-supply 3.3V reset IC; no battery switchover, no MR input, open-drain RESET output | Suitable for fixed 3.3V systems without backup requirements (e.g., simple MCU modules) | Choose TPS3808G33DBVR only for cost-sensitive 3.3V-only designs lacking battery backup or manual reset needs. |
Compared with MAX16033LLA44+T, MAX16037LLA44+T removes CE gating to reduce size and cost while retaining identical reset accuracy and battery switchover capability; versus TPS3808G33DBVR, it adds dual-supply support, MR input, and push-pull RESET - making it uniquely suited for portable 5V systems requiring robust backup.
Availability
MAX16037LLA44+T is available at Aetrix Electronics and suitable for portable POS terminals, industrial microcontroller backup systems, and set-top box brownout protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX16037LLA44+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, with emphasis on high reliability and small form factors.
The MAX16033–MAX16040 family targets space-constrained μP systems needing integrated power supervision, battery switchover, and fail-safe reset - specifically engineered for portable, industrial, and consumer equipment where board area and power efficiency are critical.
FAQ
What is the exact reset threshold voltage of the MAX16037LLA44+T?
The MAX16037LLA44+T has a factory-set reset threshold of 4.38V, with guaranteed minimum of 4.25V and maximum of 4.50V over -40°C to +85°C. This value is laser-trimmed during production and applies specifically to the "LLA44" suffix variant - confirmed in the Reset Threshold table of the official datasheet.
Does the MAX16037LLA44+T support battery backup functionality?
Yes, the MAX16037LLA44+T supports automatic battery backup: when VCC falls below both the 4.38V reset threshold and VBATT (by >40mV), it seamlessly switches OUT from VCC to BATT. In this mode, it draws only 1µA from the battery at +25°C, enabling multi-year operation with standard coin cells.
What type of reset output does the MAX16037LLA44+T provide?
The MAX16037LLA44+T provides an active-low push-pull reset output (denoted by "L" in the part number suffix). This means RESET actively drives low during assertion and high during deassertion - eliminating the need for an external pullup resistor and ensuring fast, robust interface with μP reset inputs.
Can the MAX16037LLA44+T be used without a backup battery?
Yes, the MAX16037LLA44+T operates correctly without a backup battery: connect BATT to GND and tie OUT directly to VCC. All supervisory functions - including reset generation, power-fail detection, and MR input - remain fully functional; only battery switchover is disabled.
What is the purpose of the PFI and PFO pins on the MAX16037LLA44+T?
PFI is the power-fail input that monitors an external voltage divider; when VPFI falls below 1.235V, the device asserts PFO low - an active-low power-fail output usable as a non-maskable interrupt (NMI) to the μP. Both pins enable early warning of supply degradation before VCC reaches the 4.38V reset threshold.
MAX16037LLA44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- 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:
- 8-µDFN (2x2)
MAX16037LLA44+T FAQ
1.How can I place an order for MAX16037LLA44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16037LLA44+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 MAX16037LLA44+T reliable?
The price and inventory of MAX16037LLA44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16037LLA44+T is usually 5 days.
3.What payment methods are accepted for MAX16037LLA44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16037LLA44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16037LLA44+T?
MAX16037LLA44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16037LLA44+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 MAX16037LLA44+T?
For technical support, including MAX16037LLA44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16037LLA44+T requirements.
6.How does Aetrix verify that MAX16037LLA44+T is sourced from the original manufacturer or authorized distributors?
All MAX16037LLA44+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 MAX16037LLA44+T meets industry standards.
7.What is the process for return or replacement of MAX16037LLA44+T?
All MAX16037LLA44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16037LLA44+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 MAX16037LLA44+T part is unused and in its original packaging.
Return procedure for MAX16037LLA44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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