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Analog Devices Inc./Maxim Integrated MAX6819UT-T
- Part No.:
- MAX6819UT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6819UT-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,331
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Product details
Overview
MAX6819UT-T from Maxim Integrated is a dual-supply power sequencer IC designed to control voltage sequencing between primary and secondary rails in multivoltage systems. It monitors VCC1 with an adjustable 0.618V threshold, enables an external n-channel MOSFET via charge-pump-driven GATE output, and provides a fixed 200ms delay from primary supply valid to secondary supply enable - all in a 6-pin SOT23 package rated for -40°C to +125°C operation.
For engineers reviewing the MAX6819UT-T datasheet, MAX6819UT-T pinout, MAX6819UT-T application, or MAX6819UT-T equivalent, this device addresses critical sequencing requirements in dual-voltage microprocessors, PowerPC™ systems, and DSP-based boards where VI/O must power before VCORE or vice versa - especially when supplies originate from non-sequenced sources like silver-box PSUs or shared system buses.
Technical Context
The MAX6819UT-T implements a comparator-based voltage monitor with internal 0.618V reference and externally adjustable threshold via resistor divider on SETV. Its logic-driven EN input allows digital control of sequencing initiation, while the integrated charge pump delivers up to +5.5V gate drive relative to VCC2 to fully enhance external n-channel MOSFETs - ensuring low RDS(ON) and minimal voltage drop.
It features undervoltage lockout (UVLO) at 1.875V–2.125V, operates with either VCC1 or VCC2 as primary supply (provided ≥2.125V), and disables GATE immediately upon EN deassertion or SETV falling below threshold - preventing linear-mode MOSFET operation and latch-up risk during transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | VCC1/VCC2: 0.9V to 5.5V - supports sequencing across common logic rails (1.8V, 3.3V, 5V) |
| SETV Threshold | 0.602V to 0.634V - sets minimum VCC1 turn-on voltage via external resistor divider |
| GATE Drive Voltage | VCC2 + 4.5V to +6.0V - ensures full enhancement of n-channel MOSFETs for low RDS(ON) |
| Enable Delay (tDELAY) | 140ms to 280ms (typ 200ms) - fixed factory-set timing from VCC1 valid to GATE activation |
| Supply Current (ICC) | 60µA to 120µA at +3.3V - ultra-low quiescent current preserves system efficiency |
| UVLO Threshold | 1.875V to 2.125V - prevents operation until at least one supply exceeds safe startup level |
| Temperature Range | -40°C to +125°C - qualified for automotive and industrial environments |
Pinout & Package
MAX6819UT-T is housed in a space-saving 6-pin SOT23-6 package (JEDEC MO-178AA), with exposed pad not electrically connected. The package supports reflow soldering and is available in lead-free (+T) and leaded (-T) variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC1 | Primary supply input | Either VCC1 or VCC2 must exceed UVLO (≥2.125V) to enable sequencer operation |
| 2: GND | Analog/digital ground reference | Common return path for internal comparator, charge pump, and logic circuitry |
| 3: SETV | Threshold adjustment input | Connects to resistor divider to set VCC1 trip point; 10nA input current enables high-R dividers |
| 4: EN | Active-high enable control | Logic-compatible input (VIH ≥2.0V); gates sequencing start and overrides SETV monitoring when asserted |
| 5: GATE | MOSFET gate driver output | Drives external n-channel MOSFET with charge-pump boosted voltage (VCC2 + 5.5V typ) |
| 6: VCC2 | Secondary supply input | Provides power to charge pump and defines GATE reference; can serve as primary if VCC1 is inactive |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable primary supply monitor | 0.618V internal reference with ±1% hysteresis enables precise sequencing down to 0.62V rail monitoring |
| Integrated charge pump gate driver | Delivers +5.5V gate-to-source bias relative to VCC2 - guarantees full MOSFET enhancement and <10mΩ typical RDS(ON) |
| Fixed 200ms enable timeout | Factory-trimmed delay ensures consistent sequencing timing without external components or calibration |
| Logic-driven ENABLE input | TTL/CMOS-compatible EN pin allows microcontroller or FPGA to initiate sequencing on demand, independent of voltage thresholds |
| Transient-immune threshold detection | Immunity to short negative-going transients (<16µs at 0.1V overdrive) prevents false triggering during supply noise events |
Applications
| Dual-Voltage Microprocessors | PowerPC™ Series Processors |
|---|---|
Use Scenario: Sequencing VI/O (3.3V) before VCORE (1.2V) on a PowerPC 74xx-based board powered by separate DC/DC converters. IC Role / Device Role / Timing Role: MAX6819UT-T acts as local sequencer that monitors VI/O rail and enables VCORE switch only after VI/O reaches stable 3.3V. Use Value: Prevents core latch-up and ensures correct processor initialization by enforcing strict VI/O-first power-up order. |
Use Scenario: Controlling power-up sequence in a telecom line card using PowerPC 82xx processors with multiple voltage domains (1.5V, 2.5V, 3.3V). IC Role / Device Role / Timing Role: MAX6819UT-T serves as first-stage sequencer, enabling intermediate 2.5V rail only after main 3.3V bus is valid. Use Value: Eliminates need for complex CPLD-based sequencing logic - reduces BOM count and layout area. |
| Digital Signal Processors | Multivoltage Industrial Control Boards |
Use Scenario: Powering TI C6000-series DSPs requiring AVDD (1.2V), DVDD (1.2V), and I/O (3.3V) in defined order. IC Role / Device Role / Timing Role: MAX6819UT-T monitors 3.3V I/O rail and triggers 1.2V core supply enable via external MOSFET after 200ms stabilization delay. Use Value: Guarantees 200ms minimum hold time on I/O before core activation - meets TI's recommended power-up timing margin. |
Use Scenario: Managing supply sequencing on an industrial PLC CPU module with mixed 5V analog, 3.3V logic, and 1.8V FPGA rails. IC Role / Device Role / Timing Role: MAX6819UT-T functions as dedicated sequencer for 3.3V→1.8V transition, triggered by logic-level EN signal from system controller. Use Value: Enables software-controlled sequencing during hot-swap or firmware update cycles without hardware redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply sequencing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6820UT-T | Capacitor-adjustable tDELAY (vs. fixed 200ms); replaces SETV pin with SETD for delay tuning | Used where variable sequencing delay is required across product variants or field-programmable timing | Select MAX6820UT-T when delay flexibility outweighs component count reduction from fixed-timing design |
| TPS3808G33DBVR | Single-supply supervisor with reset output only; no GATE drive, no charge pump, no sequencing logic | Suitable for basic voltage monitoring but cannot drive external MOSFETs or enforce multi-rail sequencing | Choose TPS3808G33DBVR only for simple power-good indication - not as functional replacement for MAX6819UT-T |
Compared with MAX6820UT-T and TPS3808G33DBVR, the MAX6819UT-T uniquely combines fixed-delay sequencing, logic-controlled enable, and integrated MOSFET gate drive in a single 6-pin package - making it optimal for cost-sensitive, space-constrained dual-rail systems requiring deterministic VI/O-before-VCORE behavior.
Availability
MAX6819UT-T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and telecom baseband modules requiring stable component supply with guaranteed long-term availability and AEC-Q100-aligned qualification.
Supply support for MAX6819UT-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, automotive, and communications markets.
The MAX6819UT-T belongs to Maxim's power-supply sequencer product line, engineered specifically for deterministic, local voltage sequencing in multivoltage processor and DSP systems where supply coordination cannot be guaranteed by upstream power sources.
FAQ
What is the primary function of the MAX6819UT-T in a power management system?
The MAX6819UT-T functions as a dedicated dual-rail power sequencer that monitors a primary supply (VCC1 or VCC2) and controls an external n-channel MOSFET to enable a secondary supply only after the primary reaches a user-defined threshold. Its fixed 200ms delay and logic-driven EN input make MAX6819UT-T ideal for enforcing VI/O-before-VCORE or VCORE-before-VI/O sequencing in microprocessor and DSP applications.
Can the MAX6819UT-T be used with both 3.3V and 1.8V supply rails?
Yes - the MAX6819UT-T supports operating voltages from 0.9V to 5.5V on both VCC1 and VCC2 inputs. Its 0.618V internal reference allows precise threshold setting for low-voltage rails like 1.8V via external resistor divider on SETV, while its charge-pump GATE driver delivers sufficient voltage headroom (VCC2 + 5.5V) to fully enhance MOSFETs even at 1.8V VCC2.
How does the EN pin affect sequencing behavior in the MAX6819UT-T?
The EN pin is an active-high logic input that gates the entire sequencing function: when EN is low, GATE remains disabled regardless of SETV voltage; when EN goes high, MAX6819UT-T initiates the 200ms delay and enables GATE only if SETV exceeds its threshold. This allows microcontrollers or FPGAs to synchronize sequencing with system boot state - a capability not present in passive supervisors.
What is the role of the internal charge pump in the MAX6819UT-T?
The internal charge pump in the MAX6819UT-T generates a gate drive voltage of VCC2 + 5.5V (typical) to fully enhance external n-channel MOSFETs. This ensures the MOSFET operates in saturation rather than linear mode, minimizing RDS(ON) and voltage drop across the pass device - critical for maintaining tight load regulation on sensitive processor cores.
Is the MAX6819UT-T suitable for automotive applications?
Yes - the MAX6819UT-T is specified over the full automotive temperature range (-40°C to +125°C), features undervoltage lockout (1.875V–2.125V), and exhibits immunity to short negative-going transients. These characteristics meet key requirements for engine control units, ADAS domain controllers, and infotainment systems where reliable power sequencing under harsh electrical conditions is mandatory.
MAX6819UT-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Sequencer
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- -
- Reset:
- -
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6819UT-T FAQ
1.How can I place an order for MAX6819UT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6819UT-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 MAX6819UT-T reliable?
The price and inventory of MAX6819UT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6819UT-T is usually 5 days.
3.What payment methods are accepted for MAX6819UT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6819UT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6819UT-T?
MAX6819UT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6819UT-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 MAX6819UT-T?
For technical support, including MAX6819UT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6819UT-T requirements.
6.How does Aetrix verify that MAX6819UT-T is sourced from the original manufacturer or authorized distributors?
All MAX6819UT-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 MAX6819UT-T meets industry standards.
7.What is the process for return or replacement of MAX6819UT-T?
All MAX6819UT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6819UT-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 MAX6819UT-T part is unused and in its original packaging.
Return procedure for MAX6819UT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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