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Analog Devices Inc./Maxim Integrated MAX6349YHUT+
- Part No.:
- MAX6349YHUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX6349YHUT+.pdf
- Description:
- IC REG LIN POS ADJ 150MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:803
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Product details
Overview
The MAX6349YHUT+ from Maxim Integrated is a 150mA low-dropout linear voltage regulator with integrated microprocessor reset circuit, preset to +1.8V output, featuring open-drain active-low RESET output and manual reset (MR) input. It consumes only 25µA quiescent current, delivers 180mV dropout at 100mA load, and operates from 2.5V to 5.5V input - ideal for battery-powered USB devices and handheld instruments.
For engineers reviewing the MAX6349YHUT+ datasheet, MAX6349YHUT+ pinout, MAX6349YHUT+ application, or MAX6349YHUT+ equivalent, key selection criteria include its fixed +1.8V output, -10% reset threshold (2.08V min), 100ms minimum reset timeout, MR input compatibility with TTL/CMOS logic, and SOT23-6 package thermal performance.
Technical Context
The MAX6349YHUT+ integrates a P-channel MOSFET LDO regulator core and a precision reset supervisor sharing the same 1.23V reference. Its reset circuit monitors VOUT against a -10% tolerance threshold (2.08V–2.28V for +1.8V output), asserting open-drain RESET for ≥100ms after recovery or MR deassertion.
It implements reverse leakage protection to block OUT-to-IN current when VOUT > VIN, includes thermal shutdown at +160°C with 20°C hysteresis, and supports stable operation with ≥1µF ceramic output capacitance - all in a 6-pin SOT23 package with GND serving as thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +1.8V fixed (±3.0% accuracy over 0°C to +85°C) |
| Dropout Voltage | 180mV at 100mA load - enables operation down to VIN = 1.98V |
| Quiescent Current | 25µA - extends battery life in always-on portable systems |
| Reset Threshold | -10% of VOUT (2.08V–2.28V) - ensures reliable µP reset during brownout |
| Reset Timeout | 100ms minimum - guarantees clock and supply stabilization before processor boot |
| Input Voltage Range | 2.5V to 5.5V - compatible with single Li-ion, dual alkaline, or USB 5V rails |
| MR Input Logic | Active-low with 20kΩ internal pullup to VOUT - eliminates external components for pushbutton reset |
Pinout & Package
Package: 6-pin SOT23-6 (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, GND pin serves as thermal pad - requires soldering to PCB ground plane for optimal thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input supply | Accepts 2.5V–5.5V; reverse leakage protected when VOUT > VIN |
| 2 GND | Power and thermal reference | System ground return path and primary heat sink - must connect to large copper area |
| 3 MR | Manual reset input | Active-low; internally pulled up to VOUT (20kΩ typ); triggers reset while asserted and for 100ms after release |
| 4 RESET | Open-drain active-low reset output | Sinks 3.2mA max; requires external pullup; asserts during power-up, brownout, or MR activation |
| 5 SET | Feedback voltage reference node | Connected to GND for +1.8V fixed output; impedance <50kΩ required in fixed mode |
| 6 OUT | Regulated output | Delivers up to 150mA; bypass with ≥1µF ceramic capacitor at pin for stability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated manual reset (MR) input | Enables operator-initiated reset without external logic or debouncing circuitry |
| Reverse leakage protection | Blocks current flow from OUT to IN - eliminates need for external blocking diodes in backup-battery systems |
| Thermal shutdown with hysteresis | Shuts down at +160°C and re-enables at +140°C - prevents latch-up during sustained overload |
| Low-noise 1.23V reference | Shared by regulator and reset comparator - ensures tracking between output and reset threshold |
| Stable with 1µF ceramic output cap | Reduces BOM count and board space vs. legacy regulators requiring ≥10µF tantalum |
Applications
| Hand-Held Instruments | USB Devices |
|---|---|
Use Scenario: Portable multimeters and data loggers powered by two AA batteries or USB bus power. IC Role / Device Role / Timing Role: Provides clean +1.8V supply to microcontroller and ADC while monitoring rail integrity. Use Value: 25µA quiescent current extends battery life; MR input allows user-triggered calibration reset. | Use Scenario: Low-power USB peripherals such as HID keyboards or firmware-upgradable dongles. IC Role / Device Role / Timing Role: Regulates VBUS-derived 5V down to +1.8V for logic, with reset assertion during USB suspend/resume transitions. Use Value: Open-drain RESET interfaces directly with USB controller reset pins; 100ms timeout meets USB enumeration timing requirements. |
| Palm Top Computers | Cellular Telephones |
Use Scenario: Legacy PDAs with ARM7-based SoCs requiring tightly regulated core voltage. IC Role / Device Role / Timing Role: Delivers stable +1.8V core supply and asserts reset if battery sags below 2.08V during RF transmit bursts. Use Value: -10% reset threshold provides margin for transient droop; thermal shutdown protects during high-CPU usage. | Use Scenario: Feature phones with baseband processors and display drivers operating from single-cell Li-ion. IC Role / Device Role / Timing Role: Supplies +1.8V to memory interface and resets baseband IC when VOUT falls due to battery aging or cold temperature. Use Value: 180mV dropout allows usable runtime down to 1.98V battery voltage; reverse leakage protection isolates backup RTC supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator with manual reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6329YHUT+ | No MR input; includes SHDN instead - shutdown current <1µA vs. MAX6349YHUT+'s 25µA active current | Suitable where system-level power gating replaces manual reset functionality | Select MAX6329YHUT+ only if manual reset is unnecessary and ultra-low shutdown current is critical |
| TPS76318QDBVRQ1 | Fixed +1.8V LDO only; no integrated reset or MR - requires external supervisor (e.g., TPS3808G01) | Demands additional BOM line and PCB area; reset timing not co-located with regulation | Choose only if AEC-Q100 qualification is mandatory and discrete supervision is acceptable |
Compared with MAX6329YHUT+, the MAX6349YHUT+ trades shutdown capability for manual reset control - enabling field-serviceable reset without power cycle. Versus TPS76318QDBVRQ1, it integrates reset and MR in one die, reducing component count and improving timing correlation between regulation and supervision.
Availability
MAX6349YHUT+ is available at Aetrix Electronics and suitable for USB devices, handheld instruments, palm top computers, and cellular telephones requiring stable component supply across industrial temperature range (0°C to +85°C) and long-term production continuity.
Supply support for MAX6349YHUT+ 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 - with emphasis on low-power, high-reliability solutions for portable and embedded systems.
The MAX6329/MAX6349 product line targets battery-powered microprocessor systems needing tightly coupled regulation and supervision in minimal footprint - specifically addressing the integration gap between standalone LDOs and discrete reset supervisors.
FAQ
What output voltage does the MAX6349YHUT+ deliver?
MAX6349YHUT+ delivers a fixed +1.8V output with ±3.0% accuracy over 0°C to +85°C. This is confirmed by the "Y" suffix in the part number per Maxim's Selector Guide, which maps to +1.8V output with -10% reset threshold (2.08V–2.28V). The SET pin must be connected to GND to enable this preset mode.
Does the MAX6349YHUT+ include a manual reset input?
Yes, the MAX6349YHUT+ includes an active-low manual reset (MR) input on Pin 3. It features a 20kΩ internal pullup to VOUT, accepts TTL/CMOS logic levels, and asserts the open-drain RESET output for ≥100ms after MR transitions from low to high - enabling pushbutton or logic-controlled reset without external components.
What is the reset output type of the MAX6349YHUT+?
The MAX6349YHUT+ provides an open-drain active-low RESET output on Pin 4. It sinks up to 3.2mA and requires an external pullup resistor to VOUT or another logic rail. This configuration allows wired-OR reset bus implementation and compatibility with diverse microprocessor reset inputs.
What is the minimum output capacitor required for stable operation of the MAX6349YHUT+?
The MAX6349YHUT+ requires a minimum 1µF ceramic output capacitor (X7R or X5R dielectric recommended) placed directly at the OUT pin to ensure stability across temperature and load conditions up to 150mA. Larger values (e.g., 10µF) improve PSRR and transient response but are not mandatory for basic operation.
How does reverse leakage protection work in the MAX6349YHUT+?
MAX6349YHUT+ incorporates internal reverse leakage protection that disables the pass transistor and parasitic paths when VOUT exceeds VIN - preventing backfeed from auxiliary supplies (e.g., backup batteries) into the main input rail. This eliminates the need for external blocking diodes in dual-supply systems.
MAX6349YHUT+ 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-23-6
MAX6349YHUT+ FAQ
1.How can I place an order for MAX6349YHUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6349YHUT+ 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 MAX6349YHUT+ reliable?
The price and inventory of MAX6349YHUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6349YHUT+ is usually 5 days.
3.What payment methods are accepted for MAX6349YHUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6349YHUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6349YHUT+?
MAX6349YHUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6349YHUT+ 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 MAX6349YHUT+?
For technical support, including MAX6349YHUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6349YHUT+ requirements.
6.How does Aetrix verify that MAX6349YHUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6349YHUT+ 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 MAX6349YHUT+ meets industry standards.
7.What is the process for return or replacement of MAX6349YHUT+?
All MAX6349YHUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6349YHUT+, 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 MAX6349YHUT+ part is unused and in its original packaging.
Return procedure for MAX6349YHUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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