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Analog Devices Inc./Maxim Integrated MAX834EUK+T
- Part No.:
- MAX834EUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX834EUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,939
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Product details
Overview
MAX834EUK+T from Maxim Integrated is a micropower, latching voltage monitor IC with a precision 1.204V bandgap reference, comparator, and open-drain n-channel output in SOT23-5 package. It detects falling supply voltages (e.g., battery VCC), latches low to prevent deep discharge, and requires external resistor divider for trip-threshold programming - used in battery-powered load-disconnect circuits.
For engineers reviewing the MAX834EUK+T datasheet, MAX834EUK+T pinout, MAX834EUK+T application, or MAX834EUK+T equivalent, this page delivers verified electrical specs, latch timing behavior, SOT23-5 terminal roles, real-world battery monitoring use cases, and two validated alternative parts with documented functional and interface differences.
Technical Context
The MAX834EUK+T implements a level-sensitive latch controlled by the CLEAR input, eliminating need for external hysteresis in undervoltage detection. Its comparator compares divided input voltage at IN against an internal 1.204V reference, triggering a latched active-low output when VIN falls below threshold.
Operation supports wide VCC range (2.5V to 11V), consumes <2µA typical supply current, and features ±1.25% threshold accuracy over –40°C to +85°C. The open-drain OUT can be pulled up to voltages >VCC (≤11V), enabling flexible interfacing with higher-voltage logic or MOSFET gates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +11V - powers directly from Li-ion, multi-cell alkaline, or lead-acid battery rails without regulation. |
| Threshold Reference | 1.204V ±1.25% - high-accuracy internal bandgap enables precise trip points (e.g., 3.3V or 4.5V) via external R1/R2 divider. |
| Supply Current | <2µA typical - enables multi-year operation on coin cells or small batteries in always-on monitoring applications. |
| Output Type | Open-drain n-channel - allows pull-up to voltage higher than VCC (up to 11V), supporting direct drive of P-channel MOSFET gates or mixed-voltage logic. |
| Latch Behavior | Level-sensitive CLEAR input - requires ≥1µs high pulse to reset output; once latched low, stays low until explicitly cleared, preventing false recovery during battery voltage relaxation. |
| Propagation Delay | 80µs typical (50mV overdrive) - ensures fast response to critical undervoltage events while maintaining noise immunity. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive-adjacent battery systems including portable medical and telemetry devices. |
Pinout & Package
SOT23-5 surface-mount package (3.099mm × 1.499mm × 1.397mm), RoHS-compliant, tape-and-reel (74 units/reel), top mark AAAX.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CLEAR | Asynchronous reset control | Pulse high ≥1µs to unlatch output; tie to VCC for transparent (non-latching) mode - enables manual or system-controlled recovery after battery recharge. |
| 2 - GND | Analog and digital ground reference | Common return path for reference, comparator, and output stage; must be low-impedance to maintain threshold accuracy and latch stability. |
| 3 - VCC | Primary power supply input | Supplies internal reference and logic; operates down to 1.2V while maintaining correct output state if VIN ≤ VCC/2 - supports brown-out detection during power collapse. |
| 4 - IN | Noninverting comparator input | High-impedance node (±12nA leakage) accepts resistor-divided monitored voltage; input range 0V to (VCC – 1V) - enables accurate scaling of high-voltage rails like 12V batteries. |
| 5 - OUT | Open-drain latched output | Active-low signal sinks current only; requires external pull-up; compatible with 1.8V–11V logic families - drives gate of high-side P-MOSFET in load-disconnect switches. |
Key Features
| Feature | Design Value |
|---|---|
| Prevents deep battery discharge | Latched output holds low after undervoltage event, disabling load until explicit CLEAR pulse - avoids irreversible capacity loss in Li-ion or NiCd cells. |
| Programmable trip threshold | Two-resistor divider sets VTRIP = 1.204 × (R1 + R2)/R2; supports custom thresholds (e.g., 2.7V, 3.3V, 4.5V) without trimming or calibration. |
| Ultra-low quiescent current | <2µA supply current enables >10-year shelf life on CR2032 coin cell in standby monitoring - critical for IoT edge sensors and remote asset trackers. |
| No external hysteresis required | Level-sensitive latch eliminates oscillation risk during slow battery voltage decay near trip point - simplifies design vs. comparators needing Schmitt triggers. |
| Wide VCC compatibility | Operates from 2.5V to 11V and tolerates OUT pull-up to 11V - supports single-supply designs across 1-cell Li-ion (3.0–4.2V), 3-cell alkaline (3.6–4.5V), and 12V lead-acid (10.5–14.4V). |
Applications
| Battery-Powered Load Disconnect | Precision Battery Voltage Monitor |
|---|---|
|
Use Scenario: A portable medical device uses a Li-ion battery and must disconnect non-critical loads when cell voltage drops below 3.0V to preserve emergency operation. IC Role / Device Role / Timing Role: MAX834EUK+T monitors battery voltage via resistor divider, asserts latched low on OUT to disable P-MOSFET switch, and remains asserted until clinician presses reset button tied to CLEAR. Use Value: Prevents irreversible capacity loss and thermal runaway risk by enforcing hard cutoff at precisely 3.0V, with no false re-engagement during voltage rebound. |
Use Scenario: An industrial handheld scanner logs battery health over time, requiring stable, repeatable voltage sampling at fixed intervals. IC Role / Device Role / Timing Role: MAX834EUK+T provides a calibrated 1.204V reference and comparator for ADC-triggered threshold checks; its low leakage (<12nA) avoids loading the divider network during measurement. Use Value: Enables ±1.25% trip accuracy across temperature, ensuring consistent low-battery alerts without firmware compensation or calibration drift. |
| Backup Power Supervision | Multi-Rail System Monitor |
|
Use Scenario: A smart meter uses supercapacitor backup; system must detect when main supply fails and initiate switchover before capacitor voltage collapses. IC Role / Device Role / Timing Role: MAX834EUK+T watches main 5V rail; when voltage falls below 4.5V, latched OUT pulls low to enable backup regulator and flag fault to microcontroller via interrupt. Use Value: 80µs propagation delay and 1µs CLEAR pulse requirement ensure deterministic, jitter-free switchover timing - critical for data integrity during power loss. |
Use Scenario: A battery-powered gateway monitors both main 3.3V logic rail and 5V USB input to prioritize power sources and prevent backfeed. IC Role / Device Role / Timing Role: Two MAX834EUK+T units independently supervise each rail using dedicated resistor dividers; outputs feed OR-gate to trigger system shutdown if either rail fails. Use Value: Independent latching per rail avoids single-point failure; open-drain outputs allow wired-OR without level-shifting - reduces BOM count and PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809EC26DBVR | Fixed 2.63V threshold, no external resistor programming; push-pull output; 0.9µA supply current; SOT23-3 package (3-pin) | Lacks adjustable trip point and CLEAR-controlled latch; suitable only for fixed-threshold, non-latching supervision | Select TLV809EC26DBVR only when trip voltage is fixed and latch functionality is unnecessary - saves board space but sacrifices design flexibility. |
| TPS3808G01QDBVRQ1 | Adjustable threshold via resistor divider; push-pull output; 1.8µA supply current; includes watchdog timer; SOT23-6 package | Includes watchdog timeout and reset delay features; no CLEAR pin - reset occurs automatically after timeout or VCC recovery | Choose TPS3808G01QDBVRQ1 when system-level reset sequencing or watchdog supervision is required alongside voltage monitoring - adds functionality but increases pin count and complexity. |
Compared with TLV809EC26DBVR and TPS3808G01QDBVRQ1, the MAX834EUK+T uniquely combines user-programmable trip voltage, explicit CLEAR-controlled latch, open-drain output for mixed-voltage interfacing, and ultra-low current - making it optimal for battery protection where precise, recoverable cutoff is mandatory.
Availability
MAX834EUK+T is available at Aetrix Electronics and suitable for battery-powered load disconnect, precision battery voltage monitoring, backup power supervision, and multi-rail system monitoring requiring stable component supply and long-term lifecycle support.
Supply support for MAX834EUK+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, mixed-signal, and power-management ICs for industrial, medical, communications, and consumer applications.
The MAX834EUK+T belongs to Maxim's micropower voltage monitor product line, engineered specifically for reliable, low-current battery undervoltage detection and load-disconnect control in portable and energy-constrained systems.
FAQ
What is the function of the CLEAR pin on the MAX834EUK+T?
The CLEAR pin on the MAX834EUK+T is an asynchronous reset input that releases the latched output. When the monitored voltage is above the programmed trip threshold, applying a ≥1µs high pulse to CLEAR forces OUT high. If CLEAR is tied to VCC, the MAX834EUK+T operates in transparent mode (non-latching). This behavior is essential for controlled recovery after battery recharge or replacement.
Can the MAX834EUK+T monitor voltages higher than its VCC supply?
Yes - the MAX834EUK+T can monitor voltages higher than VCC using an external resistor divider at the IN pin. The input voltage at IN must stay within 0V to (VCC – 1V), but the divided source (e.g., 12V battery) may exceed VCC. Additionally, the open-drain OUT can be pulled up to voltages up to 11V, independent of VCC, enabling safe interface with higher-voltage circuitry without level shifters.
What is the minimum supply current consumption of the MAX834EUK+T?
The MAX834EUK+T draws less than 2µA typical supply current across its full operating range (–40°C to +85°C), with 1.1µA typical at +25°C and VCC = 3.6V. This ultra-low quiescent current is achieved through optimized biasing and micropower design, making the MAX834EUK+T suitable for decade-long operation on primary lithium or coin-cell batteries in maintenance-free applications.
How do I calculate the resistor values to set a 3.3V trip threshold with the MAX834EUK+T?
To set a 3.3V trip threshold, use the formula R1 = R2 × [(VTRIP / VTH) – 1], where VTRIP = 3.3V and VTH = 1.204V. Select R2 between 500kΩ and 1MΩ for low current draw; for R2 = 1MΩ, R1 = 1MΩ × [(3.3 / 1.204) – 1] ≈ 1.74MΩ. Standard 1.74MΩ or 1.78MΩ (1% E96) resistors yield VTRIP within ±1.25% tolerance. Ensure IN voltage stays ≤ VCC – 1V.
Does the MAX834EUK+T require external hysteresis for stable operation?
No - the MAX834EUK+T does not require external hysteresis due to its level-sensitive latch architecture. Once OUT goes low upon falling input crossing the threshold, it remains latched low regardless of minor voltage fluctuations or rebound, eliminating oscillation risks common in non-latching comparators. This intrinsic stability simplifies design and improves reliability in battery undervoltage detection.
MAX834EUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 80µs Typical Propagation Delay
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX834EUK+T FAQ
1.How can I place an order for MAX834EUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX834EUK+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 MAX834EUK+T reliable?
The price and inventory of MAX834EUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX834EUK+T is usually 5 days.
3.What payment methods are accepted for MAX834EUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX834EUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX834EUK+T?
MAX834EUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX834EUK+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 MAX834EUK+T?
For technical support, including MAX834EUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX834EUK+T requirements.
6.How does Aetrix verify that MAX834EUK+T is sourced from the original manufacturer or authorized distributors?
All MAX834EUK+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 MAX834EUK+T meets industry standards.
7.What is the process for return or replacement of MAX834EUK+T?
All MAX834EUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX834EUK+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 MAX834EUK+T part is unused and in its original packaging.
Return procedure for MAX834EUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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