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Analog Devices Inc./Maxim Integrated MAX16033PLB44+T
- Part No.:
- MAX16033PLB44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-WFDFN
- Datasheet:
-
MAX16033PLB44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,557
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Product details
Overview
The MAX16033PLB44+T from Maxim Integrated is a low-power, 10-pin μDFN supervisory circuit for microprocessor power monitoring and battery switchover. It features an active-low open-drain reset output, factory-set 4.38V reset threshold (±0.13V), 140ms minimum reset timeout, 13µA quiescent supply current, and integrated power-fail comparator with 1.235V PFI threshold-designed for reliable SRAM backup in portable POS terminals.
For engineers reviewing the MAX16033PLB44+T datasheet, MAX16033PLB44+T pinout, MAX16033PLB44+T application, or MAX16033PLB44+T equivalent, key selection criteria include open-drain reset structure, 4.38V VTH tolerance over –40°C to +85°C, battery switchover hysteresis, CE gating capability, and compatibility with 1.2V–5.5V VCC operation.
Technical Context
The MAX16033PLB44+T implements a precision bandgap-based reset generator with independent power-fail detection (PFI/PFO), debounced manual-reset input (MR), and chip-enable gating logic between CEIN and CEOUT. Its internal MOSFET enables seamless VCC-to-BATT switchover when VCC falls below 4.38V and VBATT exceeds VCC by ≥40mV.
It integrates a 1.235V reference for both PFI and RESETIN comparators, supports push-pull or open-drain outputs via part-number coding ('L' = push-pull, 'P' = open-drain), and delivers guaranteed reset assertion down to 1.2V VCC while maintaining <2µA battery-backup current at –40°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.38V (factory-set, ±0.13V over –40°C to +85°C); ensures reliable reset initiation during 3.3V/5V supply brownouts. |
| Reset Timeout Period | 140ms minimum; guarantees µP initialization completes before release from reset state. | Supply Current (VCC = 3.6V) | 16µA typical; enables multi-year battery life in always-on backup applications. |
| Output Type | Active-low open-drain RESET and PFO; allows wired-OR configuration and level translation with external pull-ups. |
| Operating Voltage Range | 1.2V to 5.5V on VCC; supports direct interface with low-voltage µPs and legacy 5V systems. |
| Battery Switchover Hysteresis | 40mV; prevents oscillation during slow VCC decay near reset threshold. |
| Power-Fail Input Threshold | 1.235V (±50mV); enables precise monitoring of auxiliary supplies via resistive divider. |
Pinout & Package
MAX16033PLB44+T is housed in a RoHS-compliant, lead(Pb)-free 10-pin µDFN package (2mm × 2mm, 0.5mm pitch) with exposed pad for thermal performance. Pin 1 is marked by dot; pin numbering follows standard counter-clockwise layout from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Asserts low during VCC undervoltage, MR low, or watchdog timeout; requires external pull-up for logic-high state. |
| 2 - CEIN | Chip-enable input | Controls CEOUT pass-gate; disabled during reset to prevent erroneous RAM writes during brownout. |
| 3 - PFI | Power-fail input | Monitors auxiliary voltage via resistor divider; triggers PFO low when VPFI < 1.235V. |
| 4 - GND | Ground reference | Primary return path for VCC, BATT, and all internal circuits; must be low-impedance connection. |
| 5 - MR | Manual-reset input | Debounced logic input with 20kΩ internal pull-up; asserts RESET when pulled low. |
| 6 - PFO | Active-low power-fail output | Open-drain output mirroring PFI status; also asserts low when VCC < VTH. |
| 7 - VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT until switchover condition occurs. |
| 8 - OUT | Regulated output | Sources from VCC normally; switches to BATT during backup mode; supports up to 200mA load. |
| 9 - BATT | Backup-battery input | Connects to 2.1V–5.5V battery; enables SRAM retention when VCC fails. |
| 10 - CEOUT | Chip-enable output | Passes CEIN signal only when RESET is deasserted; actively pulled to OUT when disconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.38V ±0.13V over full temperature range eliminates external resistor calibration. |
| Integrated chip-enable gating | Prevents spurious memory writes during power failure by disabling CEIN→CEOUT path during reset. |
| Ultra-low battery-backup current | ≤2µA at –40°C enables >10-year shelf life with coin-cell batteries. |
| Independent power-fail comparator | Dedicated 1.235V reference and PFI input allow simultaneous monitoring of secondary supplies without affecting reset timing. |
| VCC transient immunity | Withstands negative-going VCC glitches ≤100ns at 3.3V, reducing false resets in noisy environments. |
Applications
| Portable POS Terminals | Critical µP Power Monitoring |
|---|---|
Use Scenario: Battery-backed receipt printers and handheld payment devices requiring persistent SRAM data during AC power loss. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brownout detection, automatic BATT switchover, and open-drain RESET signaling to ARM Cortex-M0 host. Use Value: Guarantees 140ms reset hold time and <2µA backup current, enabling 5+ year coin-cell operation without firmware intervention. | Use Scenario: Industrial PLC controllers where unexpected power interruption must not corrupt configuration registers. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 3.3V rail via VTH=4.38V (with external divider), and secondary 12V rail via PFI with 1.235V reference. Use Value: Independent PFI comparator and RESETIN input allow concurrent monitoring of two rails without shared timing dependencies. |
| Set-Top Boxes | Real-Time Clock Backup |
Use Scenario: Consumer STBs with nonvolatile memory storing channel lists and parental controls across power cycles. IC Role / Device Role / Timing Role: Provides CEIN/CEOUT gating to isolate flash memory control lines during VCC sag, preventing write corruption. Use Value: 2ns typical CEIN→CEOUT propagation delay ensures compatibility with high-speed SPI interfaces up to 50MHz. | Use Scenario: Embedded RTC modules retaining time/date during extended mains outages using supercapacitor backup. IC Role / Device Role / Timing Role: Battery switchover controller with 40mV hysteresis and <1.5Ω BATT-to-OUT on-resistance at 25°C. Use Value: Minimizes voltage drop (<150mV @ 10mA) during capacitor discharge, extending RTC uptime by >30% vs. discrete diode solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16033LLB44+T | Push-pull RESET/PFO outputs instead of open-drain; identical VTH, timing, and package. | Requires no external pull-up resistors; unsuitable for wired-OR bus configurations. | Select when driving single-load RESET inputs directly and minimizing BOM count. |
| TPS3808G33DBVR | Fixed 3.08V reset threshold; 350ms reset timeout; 2.9µA IQ; SOT-23-6 package. | Lacks battery switchover, CE gating, PFI, and MR inputs; limited to basic reset-only use cases. | Select only for cost-sensitive, space-constrained designs needing only reset generation without backup functionality. |
Compared with MAX16033LLB44+T, the MAX16033PLB44+T offers essential flexibility for multi-drop reset buses, while TPS3808G33DBVR trades away critical battery-control features for lower quiescent current and smaller footprint-making it unsuitable as a functional replacement.
Availability
MAX16033PLB44+T is available at Aetrix Electronics and suitable for portable POS terminals, industrial PLC controllers, set-top boxes, and real-time clock backup systems requiring stable component supply and long-term lifecycle support.
Supply support for MAX16033PLB44+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 connectivity in demanding industrial and consumer applications.
The MAX16033–MAX16040 product line delivers integrated battery-backup supervisory functions-including reset, watchdog, power-fail warning, and chip-enable gating-in ultra-small µDFN packages for space-constrained portable and embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX16033PLB44+T?
The MAX16033PLB44+T has a factory-set reset threshold voltage of 4.38V, with guaranteed tolerance of ±0.13V over the full operating temperature range (–40°C to +85°C). This value is laser-trimmed and specified in the Electrical Characteristics table under "RESET OUTPUT" with part-number suffix 'L_44'. The MAX16033PLB44+T does not require external resistor networks to set this threshold.
Does the MAX16033PLB44+T support battery switchover, and what is its hysteresis?
Yes, the MAX16033PLB44+T supports automatic battery switchover from VCC to BATT when VCC falls below the 4.38V reset threshold and VBATT exceeds VCC by at least 40mV. This 40mV hysteresis prevents chattering during slow VCC decay and is inherent to the internal comparator design-no external components are needed to implement it.
What is the function of the CEIN and CEOUT pins on the MAX16033PLB44+T?
The CEIN and CEOUT pins on the MAX16033PLB44+T provide chip-enable signal gating to prevent erroneous writes to CMOS RAM during power failure. When RESET is asserted, the CEIN-to-CEOUT path is disabled. CEOUT remains latched high or low depending on CEIN state at reset assertion, ensuring memory integrity. The MAX16033PLB44+T specifies 2ns typical propagation delay and <100Ω on-resistance in enabled mode.
Can the MAX16033PLB44+T monitor a second power supply, and how is that configured?
Yes, the MAX16033PLB44+T can monitor a second supply using its dedicated PFI input, which compares against a precise 1.235V internal reference. A resistive divider connects the monitored voltage to PFI so that VPFI = 1.235V at the desired trip point. For example, to monitor a 12V rail, use R1 = 87.6kΩ and R2 = 10kΩ. PFO then asserts low when the secondary supply drops below threshold.
What is the maximum load current supported by the OUT pin of the MAX16033PLB44+T?
The OUT pin of the MAX16033PLB44+T supports up to 200mA when sourced from VCC. In battery-backup mode (VCC < VTH), the internal MOSFET connects BATT to OUT with on-resistance ranging from 3.1Ω (at VCC = 4.75V) to 4.6Ω (at VCC = 2.5V), limiting practical continuous current to ~100mA at 2.5V BATT to maintain <500mV dropout. Short-circuit protection limits fault duration to 5 seconds.
MAX16033PLB44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Open Drain or Open Collector
- 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)
MAX16033PLB44+T FAQ
1.How can I place an order for MAX16033PLB44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16033PLB44+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 MAX16033PLB44+T reliable?
The price and inventory of MAX16033PLB44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16033PLB44+T is usually 5 days.
3.What payment methods are accepted for MAX16033PLB44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16033PLB44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16033PLB44+T?
MAX16033PLB44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16033PLB44+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 MAX16033PLB44+T?
For technical support, including MAX16033PLB44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16033PLB44+T requirements.
6.How does Aetrix verify that MAX16033PLB44+T is sourced from the original manufacturer or authorized distributors?
All MAX16033PLB44+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 MAX16033PLB44+T meets industry standards.
7.What is the process for return or replacement of MAX16033PLB44+T?
All MAX16033PLB44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16033PLB44+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 MAX16033PLB44+T part is unused and in its original packaging.
Return procedure for MAX16033PLB44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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