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Analog Devices Inc./Maxim Integrated MAX6349THUT+T
- Part No.:
- MAX6349THUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX6349THUT+T.pdf
- Description:
- IC REG LIN POS ADJ 150MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6349THUT+T from Maxim Integrated is a 150mA, low-dropout linear voltage regulator with integrated microprocessor reset circuit in SOT23-6 package. It delivers a fixed +3.3V output, features ±3.0% regulation accuracy over 0°C to +85°C, consumes only 25µA quiescent current, and provides 180mV dropout at 100mA load. It is designed for battery-powered portable electronics requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6349THUT+T datasheet, MAX6349THUT+T pinout, MAX6349THUT+T application, or MAX6349THUT+T equivalent, key selection criteria include its -5% reset threshold (TH suffix), active-low open-drain RESET output, manual reset input (MR), thermal/short-circuit protection, and compatibility with 1µF ceramic output capacitors.
Technical Context
The MAX6349THUT+T integrates a P-channel MOSFET LDO regulator core and a precision reset supervisor sharing the same 1.23V internal reference. Its regulator operates from 2.5V to 5.5V input and maintains stable +3.3V output with ±3.0% accuracy across temperature and load (0–100mA). The reset circuit asserts when VOUT falls below 2.92V (−5% of 3.3V) and holds RESET low for ≥100ms after recovery.
It includes a dedicated MR pin with 20kΩ internal pullup to OUT, enabling external manual reset initiation without external components. Unlike the MAX6329, it lacks shutdown control but adds robust noise immunity via 120ns MR glitch rejection and 500ns MR-to-reset delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +3.3V fixed, ±3.0% accuracy ensures reliable µP supply within JEDEC tolerance bands |
| Max Output Current | 150mA continuous - sufficient for low-power microcontrollers and peripherals |
| Dropout Voltage | 180mV at 100mA - enables operation down to VIN = 3.48V, extending battery life |
| Quiescent Current | 25µA - minimizes standby drain in always-on portable systems |
| Reset Threshold | 2.92V (−5% of 3.3V) - triggers reset before µP supply violation per JEDEC JESD8-5B |
| Reset Timeout | 100ms minimum - guarantees clock oscillator and supply stabilization before release |
| MR Input Logic | Active-low with 20kΩ internal pullup to OUT - supports momentary switch or CMOS/TTL drive without external bias |
Pinout & Package
MAX6349THUT+T is housed in a 6-pin SOT23-6 package with exposed pad for thermal dissipation. GND (Pin 2) serves dual role as electrical ground and heatsink - requires connection to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts 2.5V–5.5V supply; reverse leakage protected - safe for backup-battery scenarios |
| 2 GND | Ground / thermal pad | Reference node and primary heat path; must be soldered to large copper area for thermal management |
| 3 MR | Manual reset input | Active-low; internally pulled up to OUT (20kΩ typ); initiates reset while VOUT remains in spec |
| 4 RESET | Open-drain active-low reset output | Sinks 3.2mA at 0.4V max; requires external pullup; compatible with 1.8V/3.3V/5V µP reset inputs |
| 5 SET | Feedback reference input | Connected to GND for +3.3V mode (TH suffix); unused in fixed-voltage configuration |
| 6 OUT | Regulated output | Delivers +3.3V @ 150mA; bypassed with ≥1µF ceramic capacitor for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| Integrated manual reset (MR) | Enables operator-initiated reset without external circuitry - eliminates need for RC debouncing or logic gates |
| Zero reverse leakage current | Prevents backfeed from OUT to IN - allows seamless switchover to backup battery without external diodes |
| Thermal & short-circuit protection | Shuts down at +160°C junction temp with 20°C hysteresis - prevents damage during sustained overload |
| 1µF min output capacitor support | Reduces BOM count and board space vs. legacy regulators requiring ≥10µF tantalum |
| 120ns MR glitch rejection | Rejects EMI-induced noise on MR line - avoids spurious resets in noisy industrial or RF environments |
Applications
| USB Devices | Cellular Telephones |
|---|---|
|
Use Scenario: Powering USB peripheral ICs (e.g., USB transceivers, level shifters) from single-cell Li-ion or 3.3V system rail. IC Role / Device Role: Primary 3.3V LDO regulator with integrated reset supervision for plug-and-play initialization. Use Value: 25µA quiescent current extends standby time; 100ms reset timeout ensures USB PHY lock before enumeration. |
Use Scenario: Supplying baseband processor core voltage during sleep/wake transitions in GSM/UMTS handsets. IC Role / Device Role: System-level power supervisor ensuring clean reset assertion during battery voltage sag or charger insertion. Use Value: −5% reset threshold (2.92V) aligns with ARM core VDD min spec; MR pin enables factory test-mode reset. |
| Palm Top Computers | PCMCIA Cards |
|
Use Scenario: Regulating 3.3V for SRAM, display controller, and touch interface in handheld PDAs. IC Role / Device Role: Single-chip power solution combining regulation, reset timing, and manual reset for user-accessible reset button. Use Value: SOT23-6 footprint saves space; 180mV dropout preserves runtime as battery discharges to 3.48V. |
Use Scenario: Providing regulated 3.3V and reset signaling to PCMCIA Type II card controllers during hot-insertion. IC Role / Device Role: Hot-swap power sequencer that asserts RESET until VOUT stabilizes post-insertion. Use Value: Open-drain RESET output interfaces directly with PCMCIA socket's RESET# line; MR pin supports host-initiated card reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6329THUT+T | Same +3.3V output and −5% reset threshold, but uses SHDN (not MR) and push-pull RESET output | Lacks manual reset; suited for systems where shutdown control is prioritized over operator reset | Select MAX6329THUT+T if system requires ultra-low shutdown current (<1µA) and no manual reset function |
| TPS3808G33DBVR | Separate 3.3V LDO (TPS76333) + independent supervisor (TPS3808); no MR pin; 200ms reset timeout | Requires two ICs and additional passives; higher board area and BOM cost | Choose TPS3808G33DBVR only if design mandates TI-qualified components or needs programmable reset delay |
Compared with MAX6349THUT+T, the MAX6329THUT+T offers lower shutdown current but no MR functionality, while the TPS3808G33DBVR increases component count and layout complexity without delivering MR capability or the same 100ms deterministic timeout.
Availability
MAX6349THUT+T is available at Aetrix Electronics and suitable for USB devices, cellular telephones, palm top computers, PCMCIA cards, and handheld instruments requiring stable component supply across production lifecycles.
Supply support for MAX6349THUT+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 high-performance analog and mixed-signal ICs for power management, sensing, and communication applications.
The MAX6349THUT+T belongs to Maxim's micropower LDO regulator family optimized for battery-powered portable equipment requiring integrated reset supervision and minimal quiescent current.
FAQ
What is the reset threshold voltage for MAX6349THUT+T?
The MAX6349THUT+T has a −5% reset threshold, meaning RESET asserts when the output voltage drops below 2.92V (95% of 3.3V). This value is guaranteed across temperature and load per the TH suffix designation in Maxim's Selector Guide and is derived from the internal 1.23V reference with precise resistor trimming.
Does MAX6349THUT+T support adjustable output voltage?
No, MAX6349THUT+T is configured for fixed +3.3V output. The TH suffix indicates preset voltage mode with SET pin tied internally to ground. For adjustable operation, a different variant such as MAX6349WVUT+T (1.8V) or MAX6349YHUT+T (2.5V) with external resistor divider would be required - MAX6349THUT+T does not support voltage adjustment.
How does the MR pin function on MAX6349THUT+T?
The MR pin on MAX6349THUT+T is an active-low manual reset input with a 20kΩ internal pullup to OUT. Driving MR low forces RESET low for ≥100ms, even if VOUT remains within specification. This allows external buttons, test fixtures, or logic signals to initiate a controlled system reset without affecting power delivery.
What output capacitor is required for stable operation of MAX6349THUT+T?
MAX6349THUT+T requires a minimum 1µF ceramic (X7R/X5R) or tantalum capacitor from OUT to GND. This value ensures stability across temperature and load (0–150mA). Larger values (e.g., 10µF) improve PSRR and transient response but are not mandatory for basic regulation.
Is MAX6349THUT+T RoHS compliant and lead-free?
Yes, MAX6349THUT+T is RoHS compliant and lead-free. The "+T" suffix in the part number denotes tape-and-reel packaging with lead-free (Pb-free) finish per Maxim's standard environmental compliance policy, verified in the official device datasheet revision history and packaging documentation.
MAX6349THUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.23V (3.3V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.36V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Manual Reset
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6349THUT+T FAQ
1.How can I place an order for MAX6349THUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6349THUT+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 MAX6349THUT+T reliable?
The price and inventory of MAX6349THUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6349THUT+T is usually 5 days.
3.What payment methods are accepted for MAX6349THUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6349THUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6349THUT+T?
MAX6349THUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6349THUT+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 MAX6349THUT+T?
For technical support, including MAX6349THUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6349THUT+T requirements.
6.How does Aetrix verify that MAX6349THUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6349THUT+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 MAX6349THUT+T meets industry standards.
7.What is the process for return or replacement of MAX6349THUT+T?
All MAX6349THUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6349THUT+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 MAX6349THUT+T part is unused and in its original packaging.
Return procedure for MAX6349THUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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