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Analog Devices Inc./Maxim Integrated MAX6329SPUT+
- Part No.:
- MAX6329SPUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX6329SPUT+.pdf
- Description:
- IC REG LINEAR 150MA LDO REG MPU
- Quantity:
- Payment:
- Shipping:
Inventory:3,819
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Product details
Overview
MAX6329SPUT+ from Maxim Integrated is a 150mA, +2.5V 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 microprocessor systems.
For engineers reviewing the MAX6329SPUT+ datasheet, MAX6329SPUT+ pinout, MAX6329SPUT+ application, or MAX6329SPUT+ equivalent, this device serves as a compact, micropower voltage supervisor-regulator combo optimized for battery-powered handheld instruments, USB devices, and PCMCIA cards where supply stability, low IQ, and guaranteed reset timing are critical.
Technical Context
The MAX6329SPUT+ integrates a P-channel MOSFET LDO regulator core with a precision bandgap-referenced reset comparator. Its SET pin enables dual-mode operation: grounded for +2.5V fixed output (±3.0% accuracy), or configured with external resistors for adjustable outputs from 1.23V to 5.0V.
The reset circuit monitors VOUT against a -5% threshold (2.375V nominal for +2.5V output), asserts open-drain RESET low during undervoltage/brownout, and holds reset for ≥100ms after recovery. SHDN provides active-low shutdown reducing supply current to <1µA - a key feature distinguishing MAX6329 from MAX6349.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +2.5V fixed (±3.0% over 0°C to +85°C), set by internal divider when SET = GND |
| Max Output Current | 150mA continuous - sufficient for microcontrollers, sensors, and low-power peripherals |
| Dropout Voltage | 180mV at 100mA load - enables operation down to VIN = 2.68V while maintaining regulated 2.5V |
| Quiescent Current | 25µA typical - minimizes battery drain in always-on or sleep-mode applications |
| Reset Threshold | 2.375V (−5% of 2.5V), with 100ms minimum timeout - ensures stable clock and supply before processor boot |
| Shutdown Current | <1µA max - achieved via active-low SHDN pin, enabling ultra-low-power system suspend states |
| Input Voltage Range | 2.5V to 5.5V - compatible with single Li-ion, two-cell alkaline, or 3.3V/5V system rails |
Pinout & Package
MAX6329SPUT+ is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), with GND serving dual role as electrical reference and thermal path. Pin 2 (GND) must be soldered to a large copper area or ground plane for optimal thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts 2.5V–5.5V supply; reverse leakage protected - no external blocking diode needed if OUT is powered externally |
| 2 GND | Ground / thermal pad | Reference node and primary heat sink; requires PCB copper pour for thermal management per datasheet |
| 3 SHDN | Active-low shutdown control | Pulls regulator core offline; reduces total supply current to <1µA - essential for zero-power standby modes |
| 4 RESET | Open-drain active-low reset output | Sinks 3.2mA at 0.4V max; requires external pullup; asserts during power-up, brownout, or SHDN activation |
| 5 SET | Feedback reference input | Grounded for +2.5V fixed output; connects to resistor divider for adjustable mode - auto-detects configuration |
| 6 OUT | Regulated output | Delivers up to 150mA; bypassed with ≥1µF ceramic capacitor; short-circuit and thermal protected |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reset supervisor | Eliminates discrete RC network or external supervisor IC - saves board space and BOM count |
| Zero reverse leakage | Prevents backfeed from backup sources (e.g., coin cell) into main supply - no external diode required |
| Thermal + short-circuit protection | Auto-shutdown at 160°C junction temp with 20°C hysteresis - prevents damage under fault or overload |
| 1µF min output capacitance | Enables use of small, low-ESR ceramic caps - improves transient response and reduces solution size vs. larger tantalum |
| Push-pull or open-drain RESET options | MAX6329SPUT+ uses open-drain RESET - supports wired-OR reset buses and flexible logic-level interfacing |
Applications
| Hand-Held Instruments | USB Peripheral Devices |
|---|---|
Use Scenario: Portable multimeters and data loggers powered by two AA batteries with dynamic load switching between measurement and display modes. IC Role / Device Role / Timing Role: Provides stable +2.5V rail for ADC reference and microcontroller core, while asserting RESET until VOUT stabilizes post-battery insertion or wake-up. Use Value: 25µA IQ extends battery life >1 year in sleep; 100ms reset timeout prevents premature MCU execution before analog front-end settles. |
Use Scenario: Self-powered USB audio adapters requiring clean 2.5V for DAC and USB transceiver logic during plug-in and enumeration. IC Role / Device Role / Timing Role: Regulates VBUS-derived 5V down to +2.5V; monitors output for brownout during cable flex or host port instability; drives open-drain RESET to USB controller. Use Value: 180mV dropout allows regulation even as VBUS sags to 2.68V; zero reverse leakage avoids backfeeding host port during disconnect. |
| PCMCIA Cards | Palm Top Computers |
Use Scenario: Hot-pluggable PCMCIA memory or modem cards drawing burst currents up to 120mA from 3.3V host slot, with strict power-good sequencing. IC Role / Device Role / Timing Role: Generates local +2.5V rail and asserts RESET to card controller until VOUT reaches 95% of target and remains stable for ≥100ms. Use Value: SHDN pin enables immediate power-down on card eject; thermal protection prevents overheating in confined card slots. |
Use Scenario: Legacy Palm OS PDAs using +2.5V for DRAM interface and CPU I/O, operating from rechargeable Li-ion with voltage decay from 4.2V to 3.0V. IC Role / Device Role / Timing Role: Maintains regulated 2.5V across full battery discharge curve; triggers RESET if VOUT drops below 2.375V due to load surge or end-of-life battery sag. Use Value: Adjustable dropout behavior (P-MOSFET) sustains regulation down to VIN = 2.68V - maximizes usable battery capacity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage regulator with integrated reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326SUT+ | Same +2.5V output and SOT23-6 package, but lacks SHDN pin and offers only push-pull RESET (active-high) | No shutdown capability; incompatible with systems requiring ultra-low-power suspend states | Select MAX6326SUT+ only if SHDN is unused and active-high RESET aligns with host logic |
| TPS76325DBVR | TI's +2.5V LDO (150mA, 25µA IQ) with manual reset (MR) but no integrated supervisor - requires external reset IC or RC network | Higher BOM count and board area; no built-in reset timeout or threshold tracking | Choose TPS76325DBVR only when design already includes separate reset supervision or needs MR functionality absent in MAX6329 |
Compared with MAX6326SUT+, MAX6329SPUT+ adds critical shutdown control and open-drain flexibility; versus TPS76325DBVR, it integrates reset supervision - reducing component count, improving reliability, and guaranteeing 100ms reset hold time without external timing elements.
Availability
MAX6329SPUT+ is available at Aetrix Electronics and suitable for hand-held instruments, USB peripheral devices, and PCMCIA cards requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX6329SPUT+ 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 high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and portable applications.
The MAX6329 series belongs to Maxim's micropower supervisory regulator family, engineered specifically for battery-operated systems needing simultaneous voltage regulation and reliable power-on reset with minimal quiescent current.
FAQ
What is the exact output voltage tolerance and temperature range for MAX6329SPUT+?
The MAX6329SPUT+ delivers a nominal +2.5V output with ±3.0% accuracy over the full operating temperature range of 0°C to +85°C. This specification is guaranteed across load currents from 0 to 150mA and input voltages from 2.5V to 5.5V, as confirmed in the Electrical Characteristics table of the official datasheet. The tolerance includes initial accuracy, line regulation, and load regulation effects.
Does MAX6329SPUT+ support adjustable output voltage, and how is it configured?
Yes, MAX6329SPUT+ supports adjustable output from 1.23V to 5.0V using an external resistor divider connected to the SET pin. When SET is left ungrounded, the device automatically detects the divider and sets VOUT = 1.23V × (1 + R1/R2). For fixed +2.5V operation, SET must be tied directly to GND with impedance <50kΩ - the MAX6329SPUT+ variant is factory-configured for this preset mode.
What is the function of the SHDN pin on MAX6329SPUT+, and what happens when it is pulled high?
The SHDN pin on MAX6329SPUT+ is an active-low shutdown control. When pulled low (≤0.3×VIN), it disables the regulator core, reducing total supply current to <1µA. When pulled high (≥0.8×VIN) or left floating (via internal bias), the device operates normally. Connecting SHDN to IN ensures default active operation - no external pullup is required for standard use.
How does the reset timeout work on MAX6329SPUT+, and is it programmable?
The MAX6329SPUT+ features a fixed 100ms (minimum) reset timeout period - the RESET pin remains asserted for at least 100ms after VOUT rises above the −5% threshold (2.375V). This delay is internally generated and not user-programmable; it ensures microprocessor clocks and supplies stabilize before release. The timeout is guaranteed from 100ms to 300ms across temperature and process variation.
Can MAX6329SPUT+ be used with ceramic output capacitors, and what is the minimum value required?
Yes, MAX6329SPUT+ is fully stable with ceramic output capacitors. The datasheet specifies a minimum of 1µF (X7R or X5R dielectric) for full-rated performance across 0°C to +85°C. Using ≥1µF ceramic cap improves transient response, PSRR, and noise rejection versus tantalum - and eliminates ESR-related stability concerns common with older LDOs.
MAX6329SPUT+ 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 (3.3V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.36V @ 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-23-6
MAX6329SPUT+ FAQ
1.How can I place an order for MAX6329SPUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6329SPUT+ 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 MAX6329SPUT+ reliable?
The price and inventory of MAX6329SPUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6329SPUT+ is usually 5 days.
3.What payment methods are accepted for MAX6329SPUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6329SPUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6329SPUT+?
MAX6329SPUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6329SPUT+ 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 MAX6329SPUT+?
For technical support, including MAX6329SPUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6329SPUT+ requirements.
6.How does Aetrix verify that MAX6329SPUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6329SPUT+ 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 MAX6329SPUT+ meets industry standards.
7.What is the process for return or replacement of MAX6329SPUT+?
All MAX6329SPUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6329SPUT+, 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 MAX6329SPUT+ part is unused and in its original packaging.
Return procedure for MAX6329SPUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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