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Analog Devices Inc./Maxim Integrated MAX6338LUB+T
- Part No.:
- MAX6338LUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6338LUB+T.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,183
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Product details
Overview
The MAX6338LUB+T from Maxim Integrated is a quad voltage monitor IC designed for multivoltage system supervision, featuring factory-programmed thresholds for IN1 (adjustable), IN2 (+3.3V, ±5%), IN3 (+2.5V, ±5%), and IN4 (adjustable), with four independent open-drain active-low outputs, 25µA typical supply current, and operation from +2.5V to +5.5V over –40°C to +85°C - used in desktop/notebook computers and industrial equipment for reliable power-good signaling.
For engineers reviewing the MAX6338LUB+T datasheet, MAX6338LUB+T pinout, MAX6338LUB+T application, or MAX6338LUB+T equivalent, key selection criteria include its dual adjustable inputs, ±5% tolerance on +3.3V/+2.5V rails, internal 1.23V bandgap reference, wire-ORable outputs, and µMAX package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6338LUB+T implements four independent comparators, each comparing an input voltage against a precision internal 1.23V bandgap reference via factory-laser-trimmed resistor dividers - IN2 and IN3 use fixed +3.3V and +2.5V thresholds with ±5% trip points, while IN1 and IN4 are auxiliary inputs configurable via external resistor dividers. All comparators feature built-in 0.3% hysteresis to prevent noise-induced oscillation without external components.
Its undervoltage lockout (UVLO) circuit disables all outputs when VCC drops below +2.5V, forcing outputs low down to +1V supply; outputs are open-drain with 10µA internal pull-ups to VCC, enabling direct wire-OR connection to generate a single system reset or power-good signal across mixed-voltage domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V - powers directly from monitored +3.3V or +5V rail without auxiliary regulator |
| Supply Current (typ) | 25µA at +5V - enables always-on monitoring in battery-backed or low-power systems |
| Threshold Accuracy | ±1.5% over –40°C to +85°C - ensures reliable trip point across industrial temperature range |
| IN2/IN3 Tolerance | ±5% - matches tight regulation specs of modern +3.3V and +2.5V DC-DC converters |
| Propagation Delay | 20µs - fast enough for CPU reset timing and real-time power-fail detection |
| Output Type | Open-drain with 10µA internal pull-up - supports flexible logic interfacing and wire-OR summation |
| Threshold Hysteresis | 0.3% - eliminates need for external hysteresis resistors in noisy environments |
Pinout & Package
The MAX6338LUB+T is housed in a 10-pin µMAX® package (3.0mm × 3.0mm, 0.6mm height, 0.5mm pitch), thermally enhanced with exposed pad (not electrically connected), compatible with standard reflow profiles and high-density PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN1) | Auxiliary input | High-impedance comparator input for user-adjustable threshold (e.g., custom voltage rail monitoring) |
| 2 (IN2) | Fixed +3.3V monitor input | Factory-trimmed for ±5% trip at 3.08V–3.15V - tracks +3.3V supply tolerance |
| 3 (IN3) | Fixed +2.5V monitor input | Factory-trimmed for ±5% trip at 2.63V–2.70V - matches +2.5V LDO or regulator spec |
| 4 (IN4) | Auxiliary input | Independent high-Z input for second adjustable threshold (e.g., backup battery or analog supply) |
| 5 (GND) | Analog/digital ground | Common reference for all comparators and internal bandgap - requires low-impedance PCB plane |
| 6 (OUT4) | Active-low open-drain output | Asserts low when IN4 falls below its threshold - wire-ORable with other outputs |
| 7 (OUT3) | Active-low open-drain output | Asserts low when IN3 falls below +2.5V ±5% threshold - dedicated to +2.5V rail status |
| 8 (OUT2) | Active-low open-drain output | Asserts low when IN2 falls below +3.3V ±5% threshold - dedicated to +3.3V rail status |
| 9 (OUT1) | Active-low open-drain output | Asserts low when IN1 falls below its adjustable threshold - supports custom monitoring |
| 10 (VCC) | Power supply input | +2.5V to +5.5V supply with UVLO - forces all outputs low if VCC < +2.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual adjustable inputs (IN1 & IN4) | Enables monitoring of nonstandard rails (e.g., +1.2V, +4.2V) using external resistor dividers referenced to 1.23V internal bandgap |
| ±5% factory-trimmed +3.3V/+2.5V thresholds | Matches tight-tolerance DC-DC outputs without calibration - reduces BOM count and layout complexity |
| 25µA supply current | Allows continuous supervision in always-on subsystems (e.g., RTC, wake-on-LAN) without impacting standby power budget |
| Wire-ORable open-drain outputs | Permits single "power-good" bus across four rails - simplifies reset sequencing and eliminates external logic gates |
| Integrated 0.3% hysteresis | Prevents chatter during slow-supply ramp-up/down - no external feedback resistors required |
Applications
| Desktop Computer Power Sequencing | Notebook Computer Battery Backup Monitoring |
|---|---|
Use Scenario: Simultaneous monitoring of +12V, +5V, +3.3V, and +2.5V rails during cold boot and thermal throttling events. IC Role / Device Role / Timing Role: Quad voltage monitor providing independent active-low reset signals per rail, with wire-OR summation to generate main system RESET#. Use Value: Ensures CPU and chipset only exit reset after all critical supplies stabilize within ±5% - prevents firmware corruption and latch-up. | Use Scenario: Supervising primary +3.3V system rail and auxiliary +2.5V analog supply while detecting backup coin-cell voltage decay. IC Role / Device Role / Timing Role: IN2 monitors +3.3V, IN3 monitors +2.5V, IN1 and IN4 configured as adjustable inputs for coin-cell (e.g., 2.8V threshold) and charger detect. Use Value: Enables graceful shutdown and state save before backup power depletion - extends data retention window by >10 seconds. |
| Industrial PLC I/O Module Supervision | Networking Switch ASIC Core Voltage Monitoring |
Use Scenario: Monitoring isolated +5V, +3.3V, +2.5V, and field-side +24V (via resistor divider) in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: IN2/IN3 track digital rails; IN1/IN4 scaled for +24V and +12V - all outputs feed FPGA-based watchdog logic. Use Value: Detects brownout on any rail within 20µs and triggers hardware reset before firmware enters undefined state - meets IEC 61000-4-11 immunity requirements. | Use Scenario: Verifying stable +1.0V core, +1.8V I/O, +3.3V management, and +12V fan supply in 10G Ethernet switch line cards. IC Role / Device Role / Timing Role: IN2 = +3.3V, IN3 = +1.8V, IN1 = +1.0V (via divider), IN4 = +12V (via divider); outputs drive ASIC POR circuitry. Use Value: Guarantees ASIC remains held in reset until all four supplies settle within spec - eliminates configuration errors during hot-swap insertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3307-33D | Triple-monitor (not quad); fixed +3.3V, +5V, +3.3V thresholds; no adjustable inputs; 45µA ICC | Lacks fourth channel and programmability - unsuitable where dual auxiliary rails must be supervised | Select only if exactly three rails require monitoring and space/power allow larger SOIC-8 package |
| ADM1266ACPZ | 16-channel sequencer/supervisor with I²C interface, EEPROM, and margining; 2.5mA ICC | Full digital PMBus control vs. analog-only MAX6338LUB+T - adds firmware dependency and layout overhead | Choose for complex multi-rail systems needing programmable delay, fault logging, or remote adjustment |
Compared with TPS3307-33D and ADM1266ACPZ, the MAX6338LUB+T uniquely delivers four independent analog monitoring channels with two user-adjustable inputs in a 3mm × 3mm µMAX package at 25µA quiescent current - ideal for cost-sensitive, space-constrained designs requiring simplicity and zero firmware overhead.
Availability
MAX6338LUB+T is available at Aetrix Electronics and suitable for desktop computers, industrial PLCs, and networking switches requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6338LUB+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, computing, and communications markets.
The MAX6338LUB+T belongs to Maxim's supervisory IC product line, engineered specifically for multivoltage system power integrity assurance in space- and power-constrained embedded platforms.
FAQ
What voltage thresholds are factory-programmed in the MAX6338LUB+T?
The MAX6338LUB+T has IN2 set to +3.3V with ±5% tolerance (trip at 3.08V–3.15V), IN3 set to +2.5V with ±5% tolerance (trip at 2.63V–2.70V), and both IN1 and IN4 configured as adjustable inputs using the internal 1.23V bandgap reference - no fixed thresholds on those pins. This configuration is confirmed in Maxim's Selector Guide for part number MAX6338LUB.
Can the MAX6338LUB+T monitor negative voltages like -5.0V?
No, the MAX6338LUB+T cannot monitor -5.0V. Per the Selector Guide, only variants ending in M/N/O/P (e.g., MAX6338MUB) include the -5.0V input option. The MAX6338LUB+T uses two adjustable inputs (IN1 and IN4) and fixed +3.3V/+2.5V inputs - its IN4 pin is not wired to the -5V comparator path.
How do I configure the adjustable inputs (IN1 and IN4) on the MAX6338LUB+T?
To configure IN1 or IN4, connect an external resistor divider between the supply to monitor and GND, with the midpoint feeding the input pin. Use R1 = R2 × ((VINTH/1.23) − 1), where VINTH is desired trip voltage and R2 is typically 100kΩ. For example, to detect 4.5V, R1 ≈ 265kΩ. The MAX6338LUB+T's internal 1.23V reference ensures accuracy without trimming.
Does the MAX6338LUB+T require external bypass capacitors?
Yes - a 0.1µF ceramic capacitor placed close to the VCC pin (Pin 10) and GND (Pin 5) is recommended per Maxim's Typical Operating Circuit. This stabilizes the internal bandgap reference and suppresses supply noise that could cause false trips, especially in electrically noisy industrial or switching-power environments where the MAX6338LUB+T is commonly deployed.
What happens to the outputs of the MAX6338LUB+T when VCC drops below 2.5V?
When VCC drops below +2.5V, the MAX6338LUB+T's internal undervoltage lockout (UVLO) circuit activates and forces all four outputs (OUT1–OUT4) low, regardless of input conditions. This behavior continues down to VCC = +1V, ensuring clean, predictable reset assertion during brownout - a critical safety feature explicitly documented in the MAX6338LUB+T's Pin Description and Absolute Maximum Ratings sections.
MAX6338LUB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 2.19V, 3.08V, Adj, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- <1ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX/uSOP
MAX6338LUB+T FAQ
1.How can I place an order for MAX6338LUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6338LUB+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 MAX6338LUB+T reliable?
The price and inventory of MAX6338LUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6338LUB+T is usually 5 days.
3.What payment methods are accepted for MAX6338LUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6338LUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6338LUB+T?
MAX6338LUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6338LUB+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 MAX6338LUB+T?
For technical support, including MAX6338LUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6338LUB+T requirements.
6.How does Aetrix verify that MAX6338LUB+T is sourced from the original manufacturer or authorized distributors?
All MAX6338LUB+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 MAX6338LUB+T meets industry standards.
7.What is the process for return or replacement of MAX6338LUB+T?
All MAX6338LUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6338LUB+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 MAX6338LUB+T part is unused and in its original packaging.
Return procedure for MAX6338LUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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