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Analog Devices Inc./Maxim Integrated MAX6329WHUT+
- Part No.:
- MAX6329WHUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX6329WHUT+.pdf
- Description:
- IC REG LIN POS ADJ 150MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,514
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Product details
Overview
MAX6329WHUT+ from Maxim Integrated is a 150mA, +1.8V fixed-output low-dropout linear regulator with integrated microprocessor reset circuit, featuring 25µA quiescent current, 180mV dropout at 100mA, and open-drain active-low RESET output. It operates from 2.5V to 5.5V input and delivers stable power with thermal/short-circuit protection for portable battery-powered systems.
For engineers reviewing the MAX6329WHUT+ datasheet, MAX6329WHUT+ pinout, MAX6329WHUT+ application, or MAX6329WHUT+ equivalent, this page provides verified technical context, exact pin functions, real-world use cases in handheld instruments and USB devices, and validated alternative options for supply chain continuity.
Technical Context
The MAX6329WHUT+ integrates a P-channel MOSFET LDO regulator core with a precision 1.23V internal reference and a comparator-based reset supervisor sharing that same reference. Its SET pin enables dual-mode operation: grounded for +1.8V fixed output (W/V variant), or connected to an external resistor divider for adjustable outputs from 1.23V to 5.0V.
Reset functionality monitors VOUT against -5% or -10% thresholds (W variant uses -5% threshold), asserts active-low RESET for ≥100ms after recovery, and includes built-in glitch rejection and noise immunity. The SHDN pin provides active-low digital shutdown, reducing supply current to <1µA while preserving reset monitoring capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +1.8V ±3.0% (fixed, W variant; SET = GND) |
| Max Output Current | 150mA - sufficient for microcontrollers and peripheral ICs in space-constrained portable designs |
| Dropout Voltage | 180mV at 100mA load - enables operation down to VIN = 1.98V, extending battery life in single-cell Li-ion or alkaline systems |
| Quiescent Current | 25µA - ultra-low static consumption critical for always-on backup rails and long-term battery operation |
| Reset Threshold | -5% of VOUT (1.71V typ) - ensures reliable µP reset during brownout before functional failure occurs |
| Reset Timeout | 100ms minimum - guarantees clock oscillator and supply stabilization before processor release |
| Shutdown Current | <1µA - enables full system sleep mode without compromising reset readiness |
| Input Voltage Range | 2.5V to 5.5V - compatible with 3.3V logic rails, single-cell Li-ion (2.7–4.2V), and dual-alkaline supplies |
Pinout & Package
MAX6329WHUT+ 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 connection to large copper area or ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts 2.5V–5.5V unregulated supply; must be bypassed with ≥1µF capacitor to GND |
| 2 GND | Ground / thermal pad | Reference node for all circuits; primary heat path - solder to PCB ground plane for thermal performance |
| 3 SHDN | Active-low shutdown control | Pulls regulator core offline when low; draws <1µA in shutdown; connect to IN for normal operation |
| 4 RESET | Active-low open-drain reset output | Sinks up to 3.2mA; requires external pullup; asserts low during power-up, brownout, or shutdown |
| 5 SET | Feedback voltage selection | Grounded for +1.8V fixed output (W variant); connects to resistor divider for adjustable mode |
| 6 OUT | Regulated output | Delivers +1.8V @ up to 150mA; bypass with ≥1µF ceramic capacitor directly at pin |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reset supervisor | Eliminates need for discrete RC timing or external supervisor IC - reduces BOM count and board area |
| Zero reverse leakage current | Prevents backfeed from backup sources (e.g., coin cell) into main supply - no external blocking diode required |
| Thermal & short-circuit protection | Auto-recovery shutdown at 160°C junction temp with 20°C hysteresis - protects against sustained overload or layout faults |
| 1µF minimum output capacitance | Enables use of small, low-ESR ceramic caps - simplifies layout and improves transient response vs. larger tantalum alternatives |
| Push-pull or open-drain RESET options | Open-drain (W variant) allows wired-OR reset bus sharing across multiple regulators or supervisors |
| Adjustable output support | SET pin enables 1.23V–5.0V programmability using two resistors - supports custom rail generation without new SKUs |
Applications
| Hand-Held Instruments | USB Peripheral Devices |
|---|---|
|
Use Scenario: Portable multimeters and data loggers powered by AA/AAA batteries with tight space constraints and multi-year shelf life requirements. IC Role / Device Role / Timing Role: Primary 1.8V supply for microcontroller, ADC, and display driver; reset supervisor ensures clean boot after battery insertion or voltage sag. Use Value: 25µA quiescent current extends battery life beyond 5 years in sleep mode; 180mV dropout allows full utilization of alkaline cell voltage down to 1.98V. |
Use Scenario: USB-powered Bluetooth headsets and HID peripherals requiring regulated 1.8V I/O rails compliant with USB suspend/resume timing. IC Role / Device Role / Timing Role: Local LDO generating 1.8V for RF transceiver and sensor interface; RESET output synchronizes µP wake-up with stable VOUT and clock lock. Use Value: 100ms reset timeout satisfies USB 2.0 resume timing requirements; open-drain RESET enables shared reset bus with USB controller. |
| Palm Top Computers | PCMCIA Cards |
|
Use Scenario: Legacy PDAs with dual-voltage logic (3.3V core, 1.8V I/O) and aggressive power cycling between active and suspend states. IC Role / Device Role / Timing Role: Dedicated 1.8V I/O rail regulator with SHDN-controlled power gating; RESET asserts on any VOUT dip below 1.71V during state transitions. Use Value: SHDN input reduces total system standby current to sub-µA level; thermal protection prevents overheating during high-current bursts in compact enclosures. |
Use Scenario: Hot-pluggable PCMCIA memory or modem cards where supply sequencing and fault isolation are critical for host controller safety. IC Role / Device Role / Timing Role: Independent 1.8V regulator with reverse leakage protection - prevents card VOUT from back-driving host 3.3V rail during insertion/removal. Use Value: Zero reverse leakage eliminates risk of host supply contamination; 150mA output supports burst-mode NAND flash programming without droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6328WHUT+ | Same 1.8V output, but push-pull active-high RESET instead of open-drain active-low | Requires different µP reset polarity handling; not compatible with wired-OR reset buses | Select MAX6328WHUT+ only if host µP accepts active-high reset or dedicated reset line is available |
| TPS76318QDBVRQ1 | Automotive-grade 1.8V LDO (±2% accuracy) with manual reset input, but no integrated supervisor - requires external RC or supervisor IC | Lacks built-in reset timeout and threshold monitoring; adds BOM cost and layout complexity | Choose TPS76318QDBVRQ1 only for AEC-Q100 automotive qualification needs where external reset logic is acceptable |
Compared with MAX6329WHUT+, MAX6328WHUT+ offers identical regulation but incompatible reset polarity, while TPS76318QDBVRQ1 trades integration for automotive qualification - neither provides drop-in replacement capability due to pinout, reset architecture, or functional scope differences.
Availability
MAX6329WHUT+ is available at Aetrix Electronics and suitable for hand-held instruments, USB peripheral devices, and palm top computers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX6329WHUT+ 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 demanding industrial, medical, and portable applications.
The MAX6329 series targets battery-powered systems needing highly integrated, ultra-low-power voltage regulation with guaranteed reset behavior - optimized for space- and energy-constrained portable electronics.
FAQ
What output voltage does the MAX6329WHUT+ provide, and how is it set?
The MAX6329WHUT+ provides a fixed +1.8V output with ±3.0% accuracy over temperature and load. This is achieved by connecting the SET pin to GND, selecting the W variant's internal feedback network. The device does not require external resistors for fixed operation, simplifying design and improving stability versus adjustable configurations.
Does the MAX6329WHUT+ include thermal protection, and how does it behave under overload?
Yes, the MAX6329WHUT+ includes thermal shutdown protection that activates at +160°C junction temperature. When triggered, the pass transistor turns off, allowing the die to cool. After a 20°C hysteresis, the regulator automatically resumes operation - resulting in pulsed output during sustained overload. This protects the MAX6329WHUT+ from permanent damage without requiring external intervention.
What is the function of the SHDN pin on the MAX6329WHUT+, and what happens when it is asserted?
The SHDN pin on the MAX6329WHUT+ is an active-low shutdown control. When pulled low, it disables the regulator core, reducing total supply current to less than 1µA while maintaining reset monitoring capability. The RESET output remains active-low during shutdown, ensuring the microprocessor stays held in reset until both VOUT and SHDN return to valid states.
Can the MAX6329WHUT+ be used with ceramic output capacitors, and what is the minimum value required?
Yes, the MAX6329WHUT+ is fully stable with ceramic output capacitors. A minimum 1µF X7R or X5R ceramic capacitor is required at the OUT pin for guaranteed stability across temperature and load. Larger values (e.g., 10µF) improve PSRR and transient response, but 1µF meets all specifications including full 150mA load range and -40°C to +85°C operation.
How does the reset timeout period work on the MAX6329WHUT+, and is it adjustable?
The MAX6329WHUT+ features a fixed 100ms minimum reset timeout period (tRP), guaranteed by design and not adjustable. RESET remains asserted for at least 100ms after VOUT rises above the -5% threshold (1.71V), ensuring clocks and supplies stabilize before processor release. This timing is internally generated and requires no external components - a key advantage over RC-based reset solutions.
MAX6329WHUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tube
- 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 (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:
- Enable, 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
MAX6329WHUT+ FAQ
1.How can I place an order for MAX6329WHUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6329WHUT+ 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 MAX6329WHUT+ reliable?
The price and inventory of MAX6329WHUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6329WHUT+ is usually 5 days.
3.What payment methods are accepted for MAX6329WHUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6329WHUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6329WHUT+?
MAX6329WHUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6329WHUT+ 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 MAX6329WHUT+?
For technical support, including MAX6329WHUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6329WHUT+ requirements.
6.How does Aetrix verify that MAX6329WHUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6329WHUT+ 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 MAX6329WHUT+ meets industry standards.
7.What is the process for return or replacement of MAX6329WHUT+?
All MAX6329WHUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6329WHUT+, 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 MAX6329WHUT+ part is unused and in its original packaging.
Return procedure for MAX6329WHUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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