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Analog Devices Inc./Maxim Integrated MAX6349WHUT+T
- Part No.:
- MAX6349WHUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX6349WHUT+T.pdf
- Description:
- IC REG LDO 1.8V/ADJ SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,135
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Product details
Overview
MAX6349WHUT+T 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 = 1.50V to 1.65V), featuring 25µA quiescent current, 180mV dropout at 100mA, and open-drain active-low RESET output - designed for battery-powered portable electronics requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6349WHUT+T datasheet, MAX6349WHUT+T pinout, MAX6349WHUT+T application, or MAX6349WHUT+T equivalent, key selection criteria include its fixed +1.8V output, SOT23-6 package, manual reset (MR) input, thermal/short-circuit protection, and compatibility with 1µF ceramic output capacitors in space-constrained embedded systems.
Technical Context
The MAX6349WHUT+T integrates a P-channel MOSFET LDO regulator core with an independent reset supervisor using a shared 1.23V reference. Its regulator operates from 2.5V to 5.5V input and delivers up to 150mA with ±3.0% output accuracy over temperature and load.
The reset circuit monitors VOUT against a -10% tolerance threshold (1.50V–1.65V for +1.8V output), asserts RESET for ≥100ms after recovery, and supports external manual reset via MR - a logic-low input with 20kΩ internal pullup to OUT and 500ns propagation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +1.8V fixed (±3.0% over operating range), set by internal feedback; eliminates external resistor network. |
| Reset Threshold | -10% of VOUT → 1.50V to 1.65V; ensures robust brownout detection before microprocessor operation resumes. |
| Dropout Voltage | 180mV at 100mA load; enables operation down to VIN = 1.98V, extending usable battery life in Li-ion or dual-cell alkaline systems. |
| Quiescent Current | 25µA (independent of load); critical for multi-year battery life in always-on IoT sensors and handheld instruments. |
| RESET Timeout | 100ms minimum assertion time; guarantees stable VOUT and clock oscillator settling before processor release. |
| MR Input Logic | Active-low with 0.2×VOUT VIL and 0.8×VOUT VIH; compatible with standard CMOS/TTL drivers without level-shifting. |
| Output Capacitor | 1µF minimum ceramic; enables compact, low-ESR stabilization without tantalum or large electrolytics. |
| Protection Features | Thermal shutdown (160°C trip, 20°C hysteresis), short-circuit current limit (350mA typ), and zero reverse leakage. |
Pinout & Package
MAX6349WHUT+T is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), with GND serving as both electrical ground and thermal heatsink - requires soldering 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 protection prevents backfeed when VOUT > VIN. |
| 2 GND | Ground / thermal pad | Reference node for all circuits; must be connected to large copper area for thermal dissipation and noise immunity. |
| 3 MR | Manual reset input | Active-low signal (internal 20kΩ pullup to OUT); initiates reset regardless of VOUT status; 1µs minimum pulse width. |
| 4 RESET | Open-drain active-low reset output | Sinks 3.2mA at 0.4V max VOL; requires external pullup; asserts during power-up, brownout, or MR activation. |
| 5 SET | Feedback reference select | Connected to GND for +1.8V fixed mode; floating or misconnected disables regulation; <50kΩ impedance required for preset operation. |
| 6 OUT | Regulated output | Delivers up to 150mA at +1.8V; bypassed with ≥1µF ceramic capacitor; reverse leakage protected. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated manual reset (MR) | Enables operator- or system-initiated reset without external components; eliminates need for discrete pushbutton debounce circuitry. |
| +1.8V fixed output with ±3% accuracy | Meets core voltage requirements of modern low-power microcontrollers (e.g., ARM Cortex-M0+, RISC-V SoCs) without trimming. |
| 100ms min reset timeout | Guarantees sufficient hold-off time for clock oscillators and memory initialization before CPU execution begins. |
| Zero reverse leakage current | Allows safe backup-battery operation (e.g., coin cell on VOUT) without diode drop or power loss from main supply. |
| Thermal and short-circuit protection | Enables robust operation in unattended embedded systems; automatic recovery after fault removal avoids latch-up or burnout. |
| 1µF ceramic output capacitor support | Reduces BOM count and board area vs. legacy regulators requiring ≥10µF tantalum; improves reliability and ESR stability. |
Applications
| Hand-Held Instruments | USB-Powered Peripherals |
|---|---|
|
Use Scenario: Portable multimeters and data loggers powered by two AA batteries or USB 5V with local 1.8V rail generation. IC Role / Device Role / Timing Role: Primary 1.8V power source and system supervisor; provides regulated VDD and synchronized reset to MCU and ADC. Use Value: 25µA quiescent current extends battery life beyond 5 years in sleep mode; 180mV dropout allows operation until battery drops to ~1.98V. |
Use Scenario: USB audio interfaces and HID devices drawing power directly from USB bus while generating clean 1.8V for digital logic. IC Role / Device Role / Timing Role: Local LDO regulator and reset generator; replaces discrete supervisor + LDO combo in space-limited USB connectors. Use Value: Open-drain RESET interfaces directly with USB controller reset pins; MR input supports host-triggered firmware reload without hardware modification. |
| Palm-Top Computers | PCMCIA Cards |
|
Use Scenario: Legacy PDAs and early smartphones requiring tightly regulated 1.8V core voltage for ASICs and memory controllers. IC Role / Device Role / Timing Role: System power manager; regulates VDD_CORE and asserts reset during battery insertion/removal or low-VIN events. Use Value: -10% reset threshold (1.50V–1.65V) prevents premature wake-up during battery sag; thermal shutdown protects during high-CPU-load scenarios. |
Use Scenario: Hot-pluggable PCMCIA modems and storage cards needing immediate reset assertion upon card insertion and stable 1.8V rail. IC Role / Device Role / Timing Role: Power sequencer and supervisor; powers logic rails and synchronizes reset to host controller handshake protocol. Use Value: 100ms reset timeout satisfies PCMCIA specification timing for card enumeration; SOT23-6 footprint fits narrow card edge layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6329WHUT+T | No MR input; includes SHDN (active-low shutdown) instead; same +1.8V/-10% reset spec and SOT23-6 package. | Better suited for systems requiring ultra-low standby current (<1µA) rather than manual reset capability. | Select MAX6329WHUT+T if shutdown control is prioritized over reset initiation; not pin-compatible due to SHDN/MR pin swap. |
| TPS76318DBVR | 150mA LDO only (no reset circuit); 22µA IQ; 250mV dropout at 150mA; requires external supervisor (e.g., TPS3809). | Higher total solution size and BOM count; lacks integrated MR and reset timeout logic. | Choose only if reset functionality is implemented separately; MAX6349WHUT+T reduces component count and improves timing coordination. |
Compared with MAX6329WHUT+T, MAX6349WHUT+T trades shutdown control for manual reset - enabling field-serviceable reboots without power cycling. Against TPS76318DBVR, it integrates reset supervision and timing, eliminating external components and inter-device propagation delays critical in compact portable designs.
Availability
MAX6349WHUT+T is available at Aetrix Electronics and suitable for hand-held instruments, USB peripherals, palm-top computers, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX6349WHUT+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6329/MAX6349 product line was designed specifically for battery-powered portable equipment needing integrated power regulation and microprocessor supervision in minimal footprint - targeting space- and power-constrained embedded systems.
FAQ
What output voltage does the MAX6349WHUT+T provide, and how is it configured?
The MAX6349WHUT+T provides a fixed +1.8V output voltage. This is achieved by connecting the SET pin to GND, which selects the internal resistor divider. The device is factory-trimmed for ±3.0% accuracy across temperature and load. No external resistors are needed - unlike adjustable variants, the WH suffix denotes the +1.8V/-10% reset version.
Does the MAX6349WHUT+T include a manual reset input, and what are its electrical specifications?
Yes, the MAX6349WHUT+T includes an active-low Manual Reset (MR) input on Pin 3. It features a 20kΩ internal pullup to OUT, accepts logic-low pulses as short as 1µs, and has 500ns propagation delay from MR low-to-high transition to RESET deassertion. VIL is 0.2×VOUT and VIH is 0.8×VOUT, ensuring direct compatibility with standard CMOS outputs.
What is the reset timeout duration of the MAX6349WHUT+T, and how is it guaranteed?
The MAX6349WHUT+T guarantees a minimum reset timeout of 100ms after VOUT rises above the reset threshold (1.50V–1.65V). This is internally generated and independent of external components. The timeout remains active during MR assertion and persists for ≥100ms after MR returns high or VOUT recovers - ensuring full system stabilization before processor release.
Can the MAX6349WHUT+T operate with a 1µF ceramic output capacitor, and why is this significant?
Yes, the MAX6349WHUT+T is fully stable with a 1µF ceramic output capacitor - verified across temperature and load. This eliminates the need for larger, less reliable tantalum or aluminum electrolytic capacitors. It reduces board area, cost, and failure risk while improving transient response and PSRR, especially critical in portable and battery-operated designs.
How does the MAX6349WHUT+T handle reverse voltage conditions between IN and OUT?
The MAX6349WHUT+T incorporates reverse leakage protection that actively disables the pass transistor when VOUT exceeds VIN. This results in zero reverse current flow (≤1.5nA typical), allowing safe operation with auxiliary supplies (e.g., backup coin cell on OUT) without external blocking diodes - preserving efficiency and simplifying power architecture.
MAX6349WHUT+T 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 (1.8V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.75V @ 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
MAX6349WHUT+T FAQ
1.How can I place an order for MAX6349WHUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6349WHUT+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 MAX6349WHUT+T reliable?
The price and inventory of MAX6349WHUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6349WHUT+T is usually 5 days.
3.What payment methods are accepted for MAX6349WHUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6349WHUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6349WHUT+T?
MAX6349WHUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6349WHUT+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 MAX6349WHUT+T?
For technical support, including MAX6349WHUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6349WHUT+T requirements.
6.How does Aetrix verify that MAX6349WHUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6349WHUT+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 MAX6349WHUT+T meets industry standards.
7.What is the process for return or replacement of MAX6349WHUT+T?
All MAX6349WHUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6349WHUT+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 MAX6349WHUT+T part is unused and in its original packaging.
Return procedure for MAX6349WHUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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