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Analog Devices Inc./Maxim Integrated MAX6349YLUT+
- Part No.:
- MAX6349YLUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX6349YLUT+.pdf
- Description:
- IC REG LIN POS ADJ 150MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,751
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Product details
Overview
MAX6349YLUT+ from Maxim Integrated is a 150mA, low-dropout linear voltage regulator with integrated microprocessor reset circuit, preset for +1.8V output and -10% reset threshold (VTH = 2.08V to 2.28V), featuring open-drain active-low RESET output, 25µA quiescent current, and 180mV dropout at 100mA - deployed in battery-powered handheld instruments and USB devices where supply stability and brownout immunity are critical.
For engineers reviewing the MAX6349YLUT+ datasheet, MAX6349YLUT+ pinout, MAX6349YLUT+ application, or MAX6349YLUT+ equivalent, key selection considerations include its fixed +1.8V output, manual reset input (MR), SOT23-6 package compatibility, thermal/short-circuit protection, and support for 1µF minimum ceramic output capacitance without external supervision components.
Technical Context
The MAX6349YLUT+ integrates a P-channel MOSFET LDO regulator core with an independent reset supervisor using the same 1.23V reference. Its regulator operates from 2.5V to 5.5V input and delivers up to 150mA with ±3.0% output accuracy over 0°C to +85°C.
The reset circuit monitors VOUT against a -10% threshold (2.08V–2.28V for +1.8V output), asserts RESET low for ≥100ms after recovery, and responds to MR input pulses as short as 1µs with 120ns glitch rejection - all while maintaining zero reverse leakage and full thermal shutdown (160°C trip, 20°C hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +1.8V fixed (±3.0% accuracy over 0°C to +85°C); enables direct powering of 1.8V logic cores without external feedback. |
| Reset Threshold | -10% of VOUT → 1.62V nominal (2.08V–2.28V range); ensures reliable brownout detection before microprocessor malfunction. |
| Dropout Voltage | 180mV at 100mA load; allows operation down to VIN = 1.98V, extending usable battery life in single-cell Li-ion or dual-cell alkaline systems. |
| Quiescent Current | 25µA (independent of load); minimizes standby power loss in always-on portable devices. |
| Reset Timeout | 100ms minimum assertion time; guarantees clock oscillator and supply stabilization before processor release. |
| Manual Reset Input | Active-low MR with 20kΩ internal pullup to VOUT; supports momentary switch or logic-driven reset without external components. |
| Protection Features | Thermal shutdown (160°C), short-circuit current limit (350mA typ), reverse leakage protection (0nA IN→OUT path). |
Pinout & Package
MAX6349YLUT+ is housed in a 6-pin SOT23-6 package with exposed pad for thermal dissipation; GND pin serves dual role as electrical ground and heatsink - requires soldering to large copper area or ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts 2.5V–5.5V supply; reverse leakage protected - safe when VOUT > VIN (e.g., backup battery scenarios). |
| 2 GND | Ground / thermal pad | Reference node for all circuits; must be connected to PCB ground plane to ensure thermal performance and noise immunity. |
| 3 MR | Manual reset input | Active-low logic input with 20kΩ internal pullup to VOUT; triggers reset on falling edge, holds RESET low for ≥100ms after release. |
| 4 RESET | Open-drain active-low reset output | Sinks 3.2mA max; requires external pullup; asserts low during power-up, brownout, or MR activation - compatible with µP reset inputs. |
| 5 SET | Feedback reference input | Connected to GND for +1.8V fixed mode; floating or externally biased for adjustable outputs - auto-detects configuration. |
| 6 OUT | Regulated output | Delivers up to 150mA at +1.8V; bypassed with ≥1µF ceramic capacitor for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated manual reset input (MR) | Eliminates need for external pushbutton debounce circuitry; supports TTL/CMOS drive and long-cable noise immunity via optional 0.1µF MR-to-GND cap. |
| Zero reverse leakage protection | Prevents backfeed from VOUT to IN - enables seamless switchover to auxiliary supplies (e.g., coin-cell backup) without external blocking diodes. |
| 1µF minimum output capacitance | Reduces BOM count and board space vs. legacy regulators requiring ≥10µF; stable with X7R/X5R ceramics across full temperature range. |
| 100ms minimum reset timeout | Guarantees system clocks and PLLs stabilize before processor exit from reset - avoids boot failures in USB peripherals and modems. |
| P-channel MOSFET pass device | Enables low dropout (180mV @ 100mA) and constant 25µA quiescent current - critical for multi-day battery life in palm-top computers. |
Applications
| Hand-Held Instruments | USB Devices |
|---|---|
Use Scenario: Portable multimeters and data loggers powered by two AA cells with dynamic load switching between analog front-end and Bluetooth LE radio. IC Role / Device Role / Timing Role: Primary 1.8V supply regulator and brownout supervisor for MCU and RF SoC - MR pin enables user-initiated calibration reset. Use Value: 180mV dropout extends operational runtime to ≤2.2V per cell; 25µA IQ preserves battery charge during sleep modes lasting weeks. |
Use Scenario: Self-powered USB audio interfaces drawing bursty current from host port while maintaining clean 1.8V digital core voltage. IC Role / Device Role / Timing Role: Local LDO and reset generator for USB controller IC - RESET output synchronizes firmware initialization with VBUS presence detection. Use Value: Open-drain RESET interface matches standard USB reset timing requirements; 1µF COUT simplifies layout in space-constrained dongle designs. |
| PCMCIA Cards | Cellular Telephones |
Use Scenario: Hot-pluggable PCMCIA memory cards requiring immediate power validation and reset assertion upon slot insertion. IC Role / Device Role / Timing Role: Regulator and supervisor co-located on card edge - MR pin tied to card-detect signal to force hardware reset on insertion. Use Value: 100ms reset hold time satisfies PCMCIA 2.1 specification for controller initialization; -10% VTH ensures robustness against noisy 3.3V bus transients. |
Use Scenario: Baseband processor power domain in GSM handsets with intermittent high-current transmit bursts causing input droop. IC Role / Device Role / Timing Role: Dedicated 1.8V rail regulator with brownout detection - RESET output halts CPU execution during voltage sag to prevent data corruption. Use Value: Thermal shutdown (160°C) prevents latch-up during sustained TX bursts; zero reverse leakage avoids discharge of backup RTC battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6329YLUT+ | No MR input; includes SHDN instead - shutdown current <1µA vs. MAX6349YLUT+'s 25µA active current. | Suitable for always-off systems needing ultra-low standby; incompatible where manual reset is required. | Select MAX6329YLUT+ only if shutdown control outweighs reset flexibility. |
| TPS76318QDBVRQ1 | Fixed +1.8V LDO only (no reset circuit); 85µA IQ; 300mV dropout at 150mA; automotive-grade (-40°C to +125°C). | Requires external supervisor (e.g., TPS3809) for reset - increases component count and timing coordination complexity. | Choose only for AEC-Q100 automotive use cases where integrated reset is not mandatory. |
Compared with MAX6329YLUT+, MAX6349YLUT+ trades shutdown capability for manual reset functionality - enabling field-serviceable reboots without power cycling. Against TPS76318QDBVRQ1, it reduces total BOM count and eliminates timing skew between regulation and reset assertion, at the cost of non-automotive temperature range.
Availability
MAX6349YLUT+ is available at Aetrix Electronics and suitable for hand-held instruments, USB devices, PCMCIA cards, and cellular telephones requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX6349YLUT+ 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, communications, and consumer applications - emphasizing integration, reliability, and low-power operation.
The MAX6329/MAX6349 product line targets portable and battery-operated systems needing compact, self-contained power regulation and supervision - eliminating discrete reset ICs and external timing components.
FAQ
What output voltage does the MAX6349YLUT+ provide?
The MAX6349YLUT+ provides a fixed +1.8V regulated output with ±3.0% accuracy over 0°C to +85°C. This value is factory-set and confirmed by the 'Y' suffix in the part number, indicating the +1.8V variant. The SET pin must be connected to GND to enable this preset mode, and no external resistors are required for basic operation.
Does the MAX6349YLUT+ include a manual reset input?
Yes, the MAX6349YLUT+ includes an active-low manual reset input (MR) on Pin 3. A logic-low pulse ≥1µs on MR forces the RESET output low for ≥100ms after MR returns high. MR has a 20kΩ internal pullup to VOUT, allowing direct connection to a momentary switch or logic driver without external components.
What is the reset threshold voltage for the MAX6349YLUT+?
The MAX6349YLUT+ uses a -10% reset threshold relative to its +1.8V output, resulting in a nominal VTH of 1.62V. Per the datasheet, the actual guaranteed range is 2.08V to 2.28V - reflecting tolerance stacking between output voltage accuracy (±3%) and reset comparator accuracy. This ensures robust brownout detection before digital logic errors occur.
Can the MAX6349YLUT+ operate with a 1µF output capacitor?
Yes, the MAX6349YLUT+ is fully stable with a 1µF ceramic or tantalum output capacitor - a key design feature that reduces size and cost versus legacy regulators requiring ≥10µF. X7R or X5R dielectrics are recommended for guaranteed stability across -40°C to +85°C; Z5U/Y5V types may require ≥2.2µF below -10°C.
What protection features are built into the MAX6349YLUT+?
The MAX6349YLUT+ integrates thermal shutdown (160°C trip, 20°C hysteresis), output short-circuit current limiting (350mA typical), and reverse leakage protection (0nA IN→OUT path). These functions operate autonomously without external components - ensuring safe operation during faults, battery backup scenarios, and continuous overload conditions.
MAX6349YLUT+ 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 (2.5V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.4V @ 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
MAX6349YLUT+ FAQ
1.How can I place an order for MAX6349YLUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6349YLUT+ 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 MAX6349YLUT+ reliable?
The price and inventory of MAX6349YLUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6349YLUT+ is usually 5 days.
3.What payment methods are accepted for MAX6349YLUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6349YLUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6349YLUT+?
MAX6349YLUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6349YLUT+ 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 MAX6349YLUT+?
For technical support, including MAX6349YLUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6349YLUT+ requirements.
6.How does Aetrix verify that MAX6349YLUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6349YLUT+ 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 MAX6349YLUT+ meets industry standards.
7.What is the process for return or replacement of MAX6349YLUT+?
All MAX6349YLUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6349YLUT+, 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 MAX6349YLUT+ part is unused and in its original packaging.
Return procedure for MAX6349YLUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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