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Analog Devices Inc./Maxim Integrated MAX6349TPUT
- Part No.:
- MAX6349TPUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX6349TPUT.pdf
- Description:
- IC SUPERVISOR LDO REG W/ MPU RES
- Quantity:
- Payment:
- Shipping:
Inventory:936
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Product details
Overview
MAX6349TPUT 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 with ±3.0% accuracy, 25µA quiescent current, and 180mV dropout at 100mA load. Designed for battery-powered portable electronics, it powers microprocessors while monitoring VOUT for brownout conditions and asserting an open-drain active-low RESET signal.
For engineers reviewing the MAX6349TPUT datasheet, MAX6349TPUT pinout, MAX6349TPUT application, or MAX6349TPUT equivalent, key selection criteria include its preset 3.3V output, manual reset (MR) input, 100ms minimum reset timeout, thermal/short-circuit protection, and compatibility with 1µF ceramic output capacitors in space-constrained designs.
Technical Context
The MAX6349TPUT integrates a P-channel MOSFET LDO regulator and a precision reset supervisor sharing a common 1.23V reference. Its regulator operates from 2.5V to 5.5V input and maintains regulation down to 180mV dropout at 100mA, enabling extended battery life in handheld devices.
The reset circuit monitors VOUT against a -5% threshold (2.92V to 3.185V for 3.3V output), asserts RESET low during power-up/brownout, and holds reset for ≥100ms after recovery. A dedicated MR pin allows external logic or pushbutton to force reset while VOUT remains in spec.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +3.3V fixed, ±3.0% accuracy over 0°C to +85°C - ensures stable µP supply within JEDEC tolerance bands |
| Max Output Current | 150mA - sufficient for low-power microcontrollers and peripheral ICs in portable systems |
| Quiescent Current | 25µA - enables multi-year battery life in always-on monitoring applications |
| Dropout Voltage | 180mV at 100mA - supports operation down to ~3.12V input, extending usable Li-ion battery range |
| Reset Threshold | -5% of VOUT (2.92V–3.185V) - matches standard microprocessor supply tolerance requirements |
| Reset Timeout | 100ms minimum - guarantees clock oscillator and supply stabilization before processor release |
| MR Input Logic | Active-low with 20kΩ internal pullup to VOUT - eliminates external components for pushbutton reset |
| Package | SOT23-6 - 2.9mm × 1.6mm footprint ideal for PCMCIA cards, USB devices, and handheld instruments |
Pinout & Package
MAX6349TPUT is housed in a 6-pin SOT23 package with exposed pad for thermal dissipation. GND (Pin 2) serves dual role as electrical ground and heatsink; recommended soldering to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts 2.5V–5.5V supply; reverse leakage protected - allows backup battery connection without external diode |
| 2 GND | Ground / thermal pad | Reference node for all circuits; primary heat path - must connect to large copper area for thermal stability |
| 3 MR | Manual reset input | Active-low; internally pulled up to VOUT - enables hardware reset via switch or logic without external pullup |
| 4 RESET | Open-drain active-low reset output | Sinks 3.2mA at 0.4V max - interfaces directly with µP reset pin; requires external pullup for system-level logic |
| 5 SET | Feedback reference input | Connected to GND for 3.3V fixed mode; <10nA leakage - enables precise resistor-divider configuration for adjustable outputs |
| 6 OUT | Regulated output | Delivers 150mA; bypassed by ≥1µF ceramic capacitor - stabilizes loop response and suppresses load transients |
Key Features
| Feature | Design Value |
|---|---|
| Integrated manual reset (MR) | Enables field-serviceable or user-initiated reset without power cycle - critical for modems and cordless telephones |
| Zero reverse leakage current | Eliminates need for external blocking diodes when OUT is powered by auxiliary source - reduces BOM count and board area |
| Thermal shutdown with 20°C hysteresis | Prevents latch-up during sustained overload; auto-recovery enables fault-tolerant operation in sealed enclosures |
| 1µF minimum output capacitance | Supports ultra-compact designs using small-case ceramic caps - avoids bulky tantalum or electrolytic capacitors |
| 100ms reset timeout with glitch immunity | Filters noise-induced false resets; 120ns MR glitch rejection ensures robustness in electrically noisy environments |
Applications
| Hand-Held Instruments | USB Devices |
|---|---|
|
Use Scenario: Portable multimeters and data loggers powered by single-cell Li-ion batteries with tight space constraints. IC Role / Device Role / Timing Role: Provides clean, regulated 3.3V supply to MCU and ADC while asserting RESET until voltage stabilizes post-power-up. Use Value: 25µA quiescent current extends battery life beyond 2 years in sleep mode; 180mV dropout enables use until battery reaches 3.12V. |
Use Scenario: Self-powered USB peripherals such as HID keyboards or audio adapters requiring reliable power sequencing. IC Role / Device Role / Timing Role: Regulates bus-derived 5V down to 3.3V and generates synchronized reset pulse to initialize USB controller on plug-in. Use Value: MR pin allows host software to trigger safe firmware reload; open-drain RESET interfaces directly with USB PHY reset logic. |
| PCMCIA Cards | Cellular Telephones |
|
Use Scenario: Hot-pluggable PCMCIA memory or modem cards where supply voltage must ramp cleanly before controller initialization. IC Role / Device Role / Timing Role: Acts as card-edge power manager - regulates 3.3V rail and asserts RESET for ≥100ms after VOUT exceeds 2.92V. Use Value: SOT23-6 footprint fits narrow PCMCIA Type II form factor; zero reverse leakage prevents backfeed into host slot during removal. |
Use Scenario: Baseband processor power domain in GSM/EDGE handsets operating from declining Li-ion voltage. IC Role / Device Role / Timing Role: Supplies stable 3.3V to RF transceiver and DSP; MR pin connects to keypad interrupt line for emergency reset. Use Value: Thermal shutdown protects against antenna coupling-induced heating; 150mA output supports burst-mode transmission peaks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage regulator with integrated reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6329TPUT | Same package and 3.3V output, but features SHDN (shutdown) instead of MR; no manual reset capability | Used where system-level power gating is required instead of operator-initiated reset | Select MAX6329TPUT only if active-low shutdown control is needed and MR functionality is unnecessary |
| TPS76333DBVR | 3.3V LDO only (no reset circuit); 85µA IQ; 350mA output; SOT23-5 package - lacks MR, RESET, and SET pins | Requires external supervisor (e.g., TPS3809) for reset functionality, increasing component count and board area | Choose TPS76333DBVR only when reset is handled separately and higher output current is mandatory |
Compared with MAX6349TPUT, MAX6329TPUT replaces MR with SHDN for power optimization but sacrifices field-serviceability; TPS76333DBVR offers higher current but forces discrete reset implementation, increasing design complexity and cost in space-sensitive portable applications.
Availability
MAX6349TPUT is available at Aetrix Electronics and suitable for hand-held instruments, USB devices, PCMCIA cards, and cellular telephones requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX6349TPUT 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 interface applications.
The MAX6329/MAX6349 family targets battery-powered portable equipment, delivering integrated regulation and supervision in minimal footprint to reduce system-level component count and improve reliability.
FAQ
What output voltage does the MAX6349TPUT provide, and how is it set?
The MAX6349TPUT provides a fixed +3.3V output. This is achieved by connecting the SET pin to ground, which selects the internal feedback network. The device is factory-trimmed to ±3.0% accuracy across 0°C to +85°C. Unlike adjustable variants, no external resistors are needed - simplifying layout and reducing bill-of-materials cost for 3.3V systems.
How does the manual reset (MR) pin function on the MAX6349TPUT?
The MR pin on the MAX6349TPUT is an active-low input with a 20kΩ internal pullup to VOUT. Driving MR low forces the RESET output low for the full reset timeout period (≥100ms), even if VOUT remains within specification. This enables hardware-triggered resets via pushbuttons or logic signals without external components - a key differentiator from the MAX6329TPUT.
What is the minimum output capacitor required for stable operation of the MAX6349TPUT?
The MAX6349TPUT requires a minimum 1µF ceramic or tantalum capacitor on the OUT pin for stable operation across temperature and load. X7R or X5R dielectrics are recommended for full-range stability; Z5U/Y5V types may require ≥2.2µF below -10°C. This low capacitance requirement enables compact designs in space-constrained applications like USB devices and PCMCIA cards.
Does the MAX6349TPUT provide reverse leakage protection, and why is it important?
Yes, the MAX6349TPUT includes reverse leakage protection that blocks current flow from OUT to IN when VOUT > VIN. This eliminates the need for external blocking diodes in systems with backup batteries or multiple power sources. It prevents parasitic discharge and ensures power integrity - especially critical in handheld instruments and cellular telephones with auxiliary power paths.
What thermal protection features are built into the MAX6349TPUT?
The MAX6349TPUT incorporates thermal shutdown that activates at +160°C junction temperature, turning off the pass transistor. After cooling by 20°C hysteresis, it automatically recovers. This protects against sustained overload or poor PCB thermal design. Combined with the GND pin's dual role as heatsink, this enables reliable operation in sealed enclosures - essential for modems and cordless telephones.
MAX6349TPUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- 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-23-6
MAX6349TPUT FAQ
1.How can I place an order for MAX6349TPUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6349TPUT 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 MAX6349TPUT reliable?
The price and inventory of MAX6349TPUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6349TPUT is usually 5 days.
3.What payment methods are accepted for MAX6349TPUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6349TPUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6349TPUT?
MAX6349TPUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6349TPUT 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 MAX6349TPUT?
For technical support, including MAX6349TPUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6349TPUT requirements.
6.How does Aetrix verify that MAX6349TPUT is sourced from the original manufacturer or authorized distributors?
All MAX6349TPUT 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 MAX6349TPUT meets industry standards.
7.What is the process for return or replacement of MAX6349TPUT?
All MAX6349TPUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6349TPUT, 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 MAX6349TPUT part is unused and in its original packaging.
Return procedure for MAX6349TPUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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