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Analog Devices Inc./Maxim Integrated MAX6349VPUT+
- Part No.:
- MAX6349VPUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX6349VPUT+.pdf
- Description:
- IC REG LINEAR LDO 150MA
- Quantity:
- Payment:
- Shipping:
Inventory:210
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Product details
Overview
MAX6349VPUT+ from Maxim Integrated is a 150mA low-dropout linear voltage regulator with integrated microprocessor reset circuit, preset +1.8V output (V suffix), -10% reset threshold (V suffix), open-drain active-low RESET output (P suffix), and manual reset input (MR). It consumes only 25µA quiescent current, delivers 180mV dropout at 100mA, and operates from 2.5V to 5.5V input - designed for battery-powered handheld instruments and USB devices requiring stable low-power supply supervision.
For engineers reviewing the MAX6349VPUT+ datasheet, MAX6349VPUT+ pinout, MAX6349VPUT+ application, or MAX6349VPUT+ equivalent, key selection criteria include its fixed +1.8V output, -10% reset threshold, MR-triggered reset assertion while VOUT remains in spec, SOT23-6 package footprint, and compatibility with 1µF ceramic output capacitors.
Technical Context
The MAX6349VPUT+ integrates a P-channel MOSFET LDO regulator core and a precision reset supervisor sharing the same 1.23V internal reference. Its reset circuit monitors VOUT continuously and asserts open-drain RESET for ≥100ms after VOUT rises above the -10% threshold (1.62V nominal for +1.8V output) or after MR transitions high.
Unlike the MAX6329, the MAX6349VPUT+ replaces shutdown control with a TTL/CMOS-compatible MR input featuring 20kΩ internal pullup to OUT, 120ns glitch rejection, and 500ns MR-to-RESET delay - enabling reliable manual reset initiation without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +1.8V ±3.0% - tightly regulated supply for low-voltage logic and memory in portable systems |
| Reset Threshold | -10% of VOUT (1.62V min) - ensures processor reset during brownout before critical undervoltage |
| Dropout Voltage | 180mV at 100mA - enables operation down to 1.98V input, extending battery life in single-cell Li-ion or alkaline systems |
| Quiescent Current | 25µA - minimizes standby power loss in always-on battery-backed applications |
| Reset Timeout | 100ms minimum - guarantees clock oscillator and supply stabilization before processor release |
| MR Input Logic | Active-low with 20kΩ internal pullup to OUT - supports direct switch-to-GND connection; no external pullup needed |
| Output Capacitor | 1µF min ceramic - enables compact layout with low-ESR stability across -40°C to +85°C |
Pinout & Package
MAX6349VPUT+ is housed in a 6-pin SOT23-6 package with exposed pad thermal enhancement. GND (Pin 2) serves dual role as electrical ground and primary heat path - requires soldering to large PCB copper area for 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 and primary heat dissipation path; must connect to PCB ground plane |
| 3 MR | Manual reset input | Active-low; internally pulled up to OUT (20kΩ typ); asserts RESET for ≥100ms after rising edge |
| 4 RESET | Open-drain active-low reset output | Sinks 50µA @ 0.3V max; requires external pullup for system-level reset signaling |
| 5 SET | Feedback reference input | Connected to GND for +1.8V fixed output; determines reset threshold tracking (VTH = 0.915 × VADJ for V-suffix) |
| 6 OUT | Regulated output | Delivers up to 150mA; bypassed with ≥1µF capacitor; short-circuit and thermal protected |
Key Features
| Feature | Design Value |
|---|---|
| Integrated manual reset input | Eliminates need for external RC network or dedicated supervisor IC to implement user-initiated reset |
| Zero reverse leakage current | Prevents backup battery discharge through IN pin when main supply fails - no external blocking diode required |
| 100ms reset timeout with hysteresis | Ensures deterministic processor startup timing independent of supply ramp rate or noise transients |
| P-channel MOSFET pass device | Enables low dropout and eliminates body diode conduction path - improves efficiency and simplifies layout |
| Thermal shutdown with 20°C hysteresis | Provides self-recovering fault protection during overload or poor heatsinking without latch-up |
Applications
| Hand-Held Instruments | USB Devices |
|---|---|
Use Scenario: Portable multimeters and data loggers powered by two AA cells (2.4–3.2V range) requiring clean +1.8V for ADC and microcontroller. IC Role / Device Role / Timing Role: Primary voltage regulator and power-on reset supervisor; provides regulated supply and synchronized reset release after battery ramp. Use Value: 180mV dropout allows full utilization of battery capacity down to 1.98V; 25µA quiescent current extends shelf life. | Use Scenario: Self-powered USB peripherals (e.g., HID keyboards) drawing <100mA from 5V bus, needing isolated +1.8V I/O rail. IC Role / Device Role / Timing Role: Local LDO regulator with integrated reset; decouples USB VBUS noise and ensures clean power-up sequence for USB PHY. Use Value: 1µF output capacitor requirement enables ultra-compact design; open-drain RESET interfaces directly with USB controller reset pin. |
| Cellular Telephones | Palm Top Computers |
Use Scenario: Baseband processor auxiliary rail in GSM handsets where space and battery life are critical constraints. IC Role / Device Role / Timing Role: Secondary LDO supplying +1.8V to RF transceiver bias circuits; MR input enables factory test mode reset without modifying power sequencing. Use Value: MR pin allows in-system reset injection during production testing; -10% reset threshold matches cellular baseband voltage tolerance specs. | Use Scenario: Early PDAs using ARM7-based SoCs requiring tightly regulated +1.8V core voltage with guaranteed reset hold time. IC Role / Device Role / Timing Role: System power supervisor generating synchronized reset signal to CPU and peripheral controllers upon power application. Use Value: 100ms minimum reset timeout exceeds ARM7's recommended 50ms minimum; SOT23-6 footprint fits dense logic board 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 |
|---|---|---|---|
| MAX6329VPUT+ | Same +1.8V/-10%/open-drain output but features SHDN instead of MR; shutdown current <1µA vs. MR-enabled active operation | Lacks manual reset capability; suited for always-on sleep-mode systems rather than field-serviceable devices | Select MAX6329VPUT+ only if system requires ultra-low shutdown current and does not need operator-initiated reset |
| TPS3808G18DBVR | Separate 1.8V LDO (TPS79518) + standalone reset IC (TPS3808); no MR input; 300ms reset timeout; 1.5µA quiescent current | Requires two components and additional board area; lacks integrated MR functionality and zero reverse leakage | Choose TPS3808G18DBVR only if longer reset timeout or different reset assertion behavior is required and board space permits discrete implementation |
Compared with MAX6329VPUT+, MAX6349VPUT+ trades sub-µA shutdown for robust MR functionality - making it preferable in serviceable portable gear. Against TPS3808G18DBVR, MAX6349VPUT+ saves 30% board area and eliminates inter-component timing skew while delivering superior reverse leakage protection.
Availability
MAX6349VPUT+ is available at Aetrix Electronics and suitable for handheld instruments, USB devices, cellular telephones, and palm top computers requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for MAX6349VPUT+ 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 in industrial, automotive, and portable electronics.
The MAX6329/MAX6349 product line targets space-constrained battery-powered systems needing integrated regulation and reset - combining LDO efficiency with supervisor reliability in a single SOT23-6 package.
FAQ
What is the exact reset threshold voltage for MAX6349VPUT+?
The MAX6349VPUT+ has a -10% reset threshold relative to its +1.8V output, resulting in a nominal VTH of 1.62V. Per Electrical Characteristics table, the guaranteed range is 1.50V to 1.65V at TA = +25°C, tracking output voltage via internal resistor divider scaling (0.915 × VADJ).
Can MAX6349VPUT+ be used with an adjustable output voltage?
Yes, MAX6349VPUT+ supports adjustable output via external resistor divider on the SET pin. However, the V-suffix variant is factory-configured for +1.8V fixed output with SET tied internally to GND-compatible logic; reconfiguring requires redesigning feedback network and verifying reset threshold scaling per Figure 1 and Note 4.
Does MAX6349VPUT+ require an external pullup resistor on the RESET pin?
Yes, MAX6349VPUT+ features an open-drain active-low RESET output (P suffix), which requires an external pullup resistor to VOUT or another valid logic-high rail. Typical values range from 10kΩ to 100kΩ depending on rise-time and bus capacitance requirements.
What is the maximum load current supported by MAX6349VPUT+?
MAX6349VPUT+ delivers up to 150mA continuous output current under specified conditions (VIN ≥ VOUT + dropout, TA ≤ +85°C). Its internal current limit is 350mA (typ), allowing safe short-circuit operation without damage - verified in Absolute Maximum Ratings and Electrical Characteristics tables.
How does the MR input behave during normal operation of MAX6349VPUT+?
During normal operation, the MR input of MAX6349VPUT+ remains inactive (high) due to its 20kΩ internal pullup to OUT. When pulled low (e.g., by a momentary switch to GND), it forces RESET assertion for ≥100ms after release - even if VOUT stays within ±3% regulation, enabling reliable manual reset without affecting regulation integrity.
MAX6349VPUT+ 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 Current, Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6349VPUT+ FAQ
1.How can I place an order for MAX6349VPUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6349VPUT+ 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 MAX6349VPUT+ reliable?
The price and inventory of MAX6349VPUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6349VPUT+ is usually 5 days.
3.What payment methods are accepted for MAX6349VPUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6349VPUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6349VPUT+?
MAX6349VPUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6349VPUT+ 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 MAX6349VPUT+?
For technical support, including MAX6349VPUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6349VPUT+ requirements.
6.How does Aetrix verify that MAX6349VPUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6349VPUT+ 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 MAX6349VPUT+ meets industry standards.
7.What is the process for return or replacement of MAX6349VPUT+?
All MAX6349VPUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6349VPUT+, 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 MAX6349VPUT+ part is unused and in its original packaging.
Return procedure for MAX6349VPUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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