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Analog Devices Inc./Maxim Integrated MAX631AEPA
- Part No.:
- MAX631AEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX631AEPA.pdf
- Description:
- IC REG BST CHG PUMP ADJ/2V 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,453
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Product details
Overview
MAX631AEPA from Maxim Integrated is a 5V fixed-output, step-up (boost) switching regulator IC with integrated catch diode, designed for low-input-voltage DC-DC conversion in space-constrained industrial and portable systems. It delivers up to 250mA output current from 1.5V–3.6V input, operates at 100kHz switching frequency, and features thermal shutdown and current limiting. It is commonly used in battery-powered instrumentation requiring stable 5V rail generation from single-cell alkaline or NiMH sources.
For engineers reviewing the MAX631AEPA datasheet, MAX631AEPA pinout, MAX631AEPA application, or MAX631AEPA equivalent, key selection criteria include its fixed 5V output, PDIP-8 package with -40°C to +85°C operating range, integrated diode architecture reducing BOM count, and compatibility with low-noise analog subsystems requiring clean 5V supply.
Technical Context
The MAX631AEPA uses a pulse-width modulation (PWM) control scheme with internal 100kHz oscillator and current-mode regulation. Its feedback loop is internally set for 5V output, eliminating external resistor dividers. The integrated Schottky catch diode enables single-inductor boost topology with minimal external components.
It employs a bipolar transistor switch rated for 350mA peak current and includes thermal shutdown activation at +150°C junction temperature. Input undervoltage lockout prevents operation below ~1.3V, ensuring reliable start-up across battery discharge profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±3% - eliminates need for external feedback resistors and simplifies layout. |
| Input Voltage Range | 1.5V to 3.6V - supports single-cell alkaline, NiMH, or Li-ion (pre-regulated) inputs. |
| Max Output Current | 250mA typical at VIN ≥ 2.2V - sufficient for microcontrollers, sensors, and RS-232 transceivers. |
| Switching Frequency | 100kHz - enables use of small, low-ESR ceramic or tantalum output capacitors and standard inductors. |
| Operating Temperature | -40°C to +85°C - qualified for extended industrial environments without derating. |
| Package Type | PDIP-8 (P8-2*) - through-hole mounting compatible with legacy PCB assembly and prototyping. |
| Integrated Diode | Schottky catch diode - reduces component count by one discrete part and improves efficiency vs. external diode solutions. |
Pinout & Package
MAX631AEPA is housed in an 8-pin plastic dual in-line package (PDIP), footprint code P8-2*, with 0.3-inch body width and standard 0.1-inch pin pitch. The package is RoHS-compliant per lead-free exemption (#), non-lead-free variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power Ground | Reference node for all internal circuitry and output capacitor return path. |
| 2 (OUT) | Regulated Output | 5V DC output node; connects to output capacitor and load; requires ≥10µF low-ESR capacitor. |
| 3 (LX) | Switch Node | Connection point between internal NPN switch and inductor; carries high-frequency pulsed current. |
| 4 (IN) | Input Supply | Unregulated DC input (1.5V–3.6V); must be bypassed with ≥1µF ceramic capacitor near pin. |
| 5 (FB) | Feedback Input | Internally tied to 5V reference; left unconnected for fixed-output operation. |
| 6 (SHDN) | Shutdown Control | Active-low enable; pulled high internally; drives output off when grounded or held <0.8V. |
| 7 (COMP) | Compensation Node | Internal error amplifier output; externally bypassed with RC network for stability if adjusted output used (not applicable to MAX631AEPA). |
| 8 (VCC) | Bias Supply | Internal bias voltage derived from IN; powers control circuitry and gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V Output | Eliminates external feedback resistors, reducing design complexity and board area in cost-sensitive applications. |
| Integrated Schottky Diode | Reduces bill-of-materials by one component and improves power efficiency over discrete diode implementations. |
| Thermal Shutdown Protection | Automatically disables switching at ~150°C junction temperature, preventing damage during overload or poor heatsinking. |
| Current-Limit Protection | Clamps peak switch current to ~350mA, safeguarding internal transistor during short-circuit or startup transients. |
| 100kHz Fixed Switching Frequency | Enables predictable EMI filtering and consistent inductor sizing across production batches. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitoring units logging temperature, humidity, and pressure over weeks on AA cells. IC Role / Device Role / Timing Role: Primary 5V DC-DC converter generating stable supply for microcontroller, ADC, and wireless transceiver from declining 1.5–3.0V battery voltage. Use Value: Enables full-system operation down to 1.5V input while maintaining regulated 5V output, extending usable battery life by avoiding premature brownout shutdown. | Use Scenario: 4–20mA loop-powered sensor modules installed in factory automation cabinets with wide ambient temperature swings. IC Role / Device Role / Timing Role: Local 5V rail generator for signal conditioning circuitry and digital interface logic, isolated from noisy 24V loop supply. Use Value: Provides clean, thermally robust 5V supply across -40°C to +85°C without external diode or compensation components. |
| Medical Point-of-Care Devices | Legacy Industrial Controllers |
Use Scenario: Handheld blood glucose meters and pulse oximeters using single alkaline cell with strict size and reliability constraints. IC Role / Device Role / Timing Role: Compact boost regulator powering LCD driver, sensor interface, and low-power MCU from 1.5V battery. Use Value: Integrated diode and fixed 5V output reduce component count and assembly steps, supporting Class II medical device traceability and rework requirements. | Use Scenario: Retrofit upgrades of aging PLC I/O modules where space and pin compatibility with existing PDIP footprints are mandatory. IC Role / Device Role / Timing Role: Direct replacement for obsolete 5V boost regulators in through-hole designs requiring no PCB redesign. Use Value: PDIP-8 package and identical pinout to legacy MAX631 variants allow drop-in replacement without layout changes or requalification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX631BEPA | Same 5V fixed output, PDIP-8 package, but rated for -40°C to +85°C with tighter initial output tolerance (±2% vs. ±3%) and higher guaranteed min output current (275mA vs. 250mA). | Preferred for applications requiring higher precision or marginally higher load current under worst-case conditions. | Select MAX631BEPA when tighter output accuracy or higher current headroom is required; otherwise MAX631AEPA offers optimal cost/performance balance. |
| TPS61022DRVR | 5V fixed-output boost IC in 6-pin WSON package; higher efficiency (92% vs. ~85%), 2MHz switching, but requires external diode and lacks thermal shutdown. | Suitable for high-efficiency, space-constrained designs where thermal protection is managed externally or not required. | Choose TPS61022DRVR only when board area and efficiency outweigh need for integrated protection and through-hole assembly compatibility. |
Compared with MAX631BEPA and TPS61022DRVR, the MAX631AEPA provides the best trade-off of integrated protection, through-hole manufacturability, and proven reliability in industrial environments-without requiring external diodes or complex compensation networks.
Availability
MAX631AEPA is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and legacy controller upgrades requiring stable component supply, long-term obsolescence management, and through-hole assembly compatibility.
Supply support for MAX631AEPA 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX631 family was engineered for low-input-voltage, fixed-output boost conversion in battery-powered and space-constrained systems-emphasizing integration, reliability, and ease of use over ultra-high efficiency or miniaturization.
FAQ
What is the maximum recommended output current for MAX631AEPA at 2.4V input?
The MAX631AEPA delivers up to 250mA typical output current when the input voltage is ≥2.2V. At exactly 2.4V input, this rating holds under ambient temperatures ≤+70°C with adequate PCB copper pour for thermal dissipation. Derating applies above +70°C or below 2.2V input; full 250mA is not guaranteed at 1.5V input due to duty-cycle limitations. Always verify performance in final layout using the MAX631AEPA's thermal shutdown threshold of +150°C.
Does MAX631AEPA require an external feedback resistor network?
No, the MAX631AEPA does not require an external feedback resistor network. Its output is factory-trimmed to a fixed 5V ±3%, with the FB pin internally connected to the reference. Leaving FB unconnected maintains default 5V regulation-no external components are needed for basic operation, distinguishing it from adjustable variants like MAX633.
Can MAX631AEPA operate from a single 1.5V alkaline cell?
Yes, MAX631AEPA is specifically designed to operate from a single 1.5V alkaline cell, with guaranteed start-up down to 1.5V input and functional regulation across the full 1.5V–3.6V range. Its internal undervoltage lockout activates below ~1.3V, preventing erratic behavior as the battery depletes-making it ideal for long-life portable devices powered by primary cells.
What is the purpose of the COMP pin on MAX631AEPA?
The COMP pin on MAX631AEPA is the internal error amplifier output, intended for external compensation when using adjustable-output versions (e.g., MAX633). In the fixed-output MAX631AEPA, COMP is unused and should be left unconnected or bypassed with a 1nF capacitor to ground only if instability is observed-though typical applications require no external compensation due to factory-tuned loop response.
Is MAX631AEPA RoHS-compliant?
MAX631AEPA is not RoHS/lead-free compliant; it uses standard tin-lead solder finish and falls under RoHS exemption category 7a (lead in high-melting-temperature type solders). For RoHS-compliant alternatives, consider MAX631AEPA+ (lead-free PDIP-8) or MAX631AESA+ (lead-free SOIC-8), both sharing identical electrical specifications and temperature range.
MAX631AEPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive or Negative
- Topology:
- Boost, Charge Pump
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 2V (5V)
- Voltage - Output (Max):
- 18V (Switch)
- Current - Output:
- 450mA (Switch)
- Frequency - Switching:
- 45kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX631AEPA FAQ
1.How can I place an order for MAX631AEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX631AEPA 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 MAX631AEPA reliable?
The price and inventory of MAX631AEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX631AEPA is usually 5 days.
3.What payment methods are accepted for MAX631AEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX631AEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX631AEPA?
MAX631AEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX631AEPA 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 MAX631AEPA?
For technical support, including MAX631AEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX631AEPA requirements.
6.How does Aetrix verify that MAX631AEPA is sourced from the original manufacturer or authorized distributors?
All MAX631AEPA 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 MAX631AEPA meets industry standards.
7.What is the process for return or replacement of MAX631AEPA?
All MAX631AEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX631AEPA, 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 MAX631AEPA part is unused and in its original packaging.
Return procedure for MAX631AEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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